Eye and face protection - Test methods - Part 2 : Physical optical properties (ISO 18526-2:2020)

This document specifies the reference test methods for determining the physical optical properties of
personal eye- and face -protectors.
This document does not apply to sunglasses for which the test methods are given in ISO 12311.
Other test methods may be used provided they have been shown to be equivalent.

Augen- und Gesichtsschutz - Prüfverfahren - Teil 2: Physikalisch optische Eigenschaften (ISO 18526-2:2020)

Dieses Dokument legt die Bezugsprüfverfahren für die Bestimmung der physikalisch-optischen Eigenschaften von persönlichen Augen- und Gesichtsschutzgeräten fest.
Dieses Dokument gilt nicht für etwaige Anforderungsnormen für Augen- und Gesichtsschutzprodukte, für die andere Prüfverfahren festgelegt sind.
Andere Prüfverfahren können angewendet werden, sofern ihre Gleichwertigkeit nachgewiesen ist und ihre Präzision die für das Referenzverfahren geforderte nicht übersteigt.

Protection des yeux et du visage - Méthodes d'essai - Partie 2: Propriétés optiques physiques (ISO 18526-2:2020)

Le présent document spécifie les méthodes d'essai de référence pour la détermination des propriétés optiques physiques des équipements de protection individuelle des yeux et du visage.
Le présent document ne s'applique à aucun produit relatif à la protection des yeux et du visage pour lequel les normes d'exigences spécifient d'autres méthodes d'essai.
D'autres méthodes d'essai peuvent être utilisées à condition que leur équivalence ait été démontrée et si les incertitudes de mesure qui leur sont associées n'excèdent pas celles exigées par la méthode de référence.

Varovanje oči in obraza - Preskusne metode - 2. del: Fizikalne optične lastnosti (ISO 18526-2:2020)

General Information

Status
Published
Public Enquiry End Date
24-Jul-2018
Publication Date
23-Apr-2020
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
31-Mar-2020
Due Date
05-Jun-2020
Completion Date
24-Apr-2020

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SLOVENSKI STANDARD
SIST EN ISO 18526-2:2020
01-maj-2020

Varovanje oči in obraza - Preskusne metode - 2. del: Fizikalne optične lastnosti

(ISO 18526-2:2020)

Eye and face protection - Test methods - Part 2 : Physical optical properties (ISO 18526-

2:2020)

Augen- und Gesichtsschutz - Prüfverfahren - Teil 2: Physikalisch optische Eigenschaften

(ISO 18526-2:2020)

Protection des yeux et du visage - Méthodes d'essai - Partie 2: Propriétés optiques

physiques (ISO 18526-2:2020)
Ta slovenski standard je istoveten z: EN ISO 18526-2:2020
ICS:
13.340.20 Varovalna oprema za glavo Head protective equipment
SIST EN ISO 18526-2:2020 en

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------
SIST EN ISO 18526-2:2020
---------------------- Page: 2 ----------------------
SIST EN ISO 18526-2:2020
EN ISO 18526-2
EUROPEAN STANDARD
NORME EUROPÉENNE
March 2020
EUROPÄISCHE NORM
ICS 13.340.20
English Version
Eye and face protection - Test methods - Part 2 : Physical
optical properties (ISO 18526-2:2020)

Protection des yeux et du visage - Méthodes d'essai - Augen- und Gesichtsschutz - Prüfverfahren - Teil 2:

Partie 2: Propriétés optiques physiques (ISO 18526- Physikalisch optische Eigenschaften (ISO 18526-

2:2020) 2:2020)
This European Standard was approved by CEN on 25 January 2020.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this

European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references

concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN

member.

This European Standard exists in three official versions (English, French, German). A version in any other language made by

translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management

Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,

Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,

Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and

United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels

© 2020 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 18526-2:2020 E

worldwide for CEN national Members.
---------------------- Page: 3 ----------------------
SIST EN ISO 18526-2:2020
EN ISO 18526-2:2020 (E)
Contents Page

European foreword ....................................................................................................................................................... 3

---------------------- Page: 4 ----------------------
SIST EN ISO 18526-2:2020
EN ISO 18526-2:2020 (E)
European foreword

This document (EN ISO 18526-2:2020) has been prepared by Technical Committee ISO/TC 94

"Personal safety -- Personal protective equipment" in collaboration with Technical Committee CEN/TC

85 “Eye protective equipment” the secretariat of which is held by AFNOR.

This European Standard shall be given the status of a national standard, either by publication of an

identical text or by endorsement, at the latest by September 2020, and conflicting national standards

shall be withdrawn at the latest by September 2020.

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. CEN shall not be held responsible for identifying any or all such patent rights.

According to the CEN-CENELEC Internal Regulations, the national standards organizations of the

following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,

Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland,

Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of

North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the

United Kingdom.
Endorsement notice

The text of ISO 18526-2:2020 has been approved by CEN as EN ISO 18526-2:2020 without any

modification.
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SIST EN ISO 18526-2:2020
---------------------- Page: 6 ----------------------
SIST EN ISO 18526-2:2020
INTERNATIONAL ISO
STANDARD 18526-2
First edition
2020-02
Eye and face protection — Test
methods —
Part 2:
Physical optical properties
Protection des yeux et du visage — Méthodes d'essai —
Partie 2: Propriétés optiques physiques
Reference number
ISO 18526-2:2020(E)
ISO 2020
---------------------- Page: 7 ----------------------
SIST EN ISO 18526-2:2020
ISO 18526-2:2020(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2020

All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may

be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting

on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address

below or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Fax: +41 22 749 09 47
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2020 – All rights reserved
---------------------- Page: 8 ----------------------
SIST EN ISO 18526-2:2020
ISO 18526-2:2020(E)
Contents Page

Foreword ......................................................................................................................................................................................................................................vii

Introduction ............................................................................................................................................................................................................................viii

1 Scope ................................................................................................................................................................................................................................. 1

2 Normative references ...................................................................................................................................................................................... 1

3 Terms and definitions ..................................................................................................................................................................................... 1

4 Preparatory information ............................................................................................................................................................................. 1

5 General test requirements ......................................................................................................................................................................... 2

6 Test methods for measuring transmittance — General ............................................................................................... 2

6.1 Uncertainty of measurement ...................................................................................................................................................... 2

6.2 Reporting compliance ....................................................................................................................................................................... 3

6.3 Applicability .............................................................................................................................................................................................. 3

6.4 Position and direction of measurement ............................................................................................................................ 3

6.5 Wavelength intervals ......................................................................................................................................................................... 3

6.6 Test report ................................................................................................................................................................................................... 3

7 Luminous transmittance .............................................................................................................................................................................. 3

7.1 Calculations of luminous transmittance from spectral values ......... .............................................................. 3

7.2 Test report ................................................................................................................................................................................................... 3

7.3 Broadband method of measurement of luminous transmittance .............................................................. 4

7.3.1 Apparatus ............................................................................................................................................................................... 4

7.3.2 Calibration ............................................................................................................................................................................. 4

7.3.3 Procedure ............................................................................................................................................................................... 4

7.3.4 Test reports for luminous transmittance values .................................................................................. 4

7.4 Measurement of uniformity of luminous transmittance .................................................................................... 4

7.4.1 Unmounted filter covering one eye ................................................................................................................. 4

7.4.2 Filter covering both eyes ........................................................................................................................................... 6

7.5 Transmittance matching at right and left reference points .............................................................................. 9

7.5.1 Test method .......................................................................................................................................................................... 9

7.5.2 Calculations .......................................................................................................................................................................10

7.5.3 Test report ..........................................................................................................................................................................10

8 Ultraviolet transmittance .........................................................................................................................................................................10

8.1 General ........................................................................................................................................................................................................10

8.2 Spectral transmittance and mean spectral transmittance .............................................................................10

8.3 Solar UV transmittance .................................................................................................................................................................10

8.4 Solar UV-A transmittance ............................................................................................................................................................10

8.5 Solar UV-B transmittance ............................................................................................................................................................10

8.6 Mean UV-A transmittance ...........................................................................................................................................................10

8.7 Mean UV-B transmittance ...........................................................................................................................................................11

8.8 Mean 380 nm to 400 nm transmittance .........................................................................................................................11

8.9 Test report ................................................................................................................................................................................................11

9 Blue-light transmittance ...........................................................................................................................................................................11

9.1 Solar blue-light transmittance ................................................................................................................................................11

9.1.1 Calculation of solar blue-light transmittance from spectral values ..................................11

9.1.2 Broadband method of measurement of solar blue-light transmittance .......................11

9.2 Blue-light transmittance from artificial sources .....................................................................................................11

9.2.1 Calculation of blue-light transmittance from artificial sources from

spectral values ................................................................................................................................................................11

9.2.2 Broadband method of measurement of blue-light transmittance from

artificial sources ............................................................................................................................................................12

9.2.3 Test report ..........................................................................................................................................................................12

10 IR transmittance ................................................................................................................................................................................................12

© ISO 2020 – All rights reserved iii
---------------------- Page: 9 ----------------------
SIST EN ISO 18526-2:2020
ISO 18526-2:2020(E)

10.1 Near IR transmittance....................................................................................................................................................................12

10.1.1 Calculation ..........................................................................................................................................................................12

10.2 IR-A transmittance ............................................................................................................................................................................12

10.2.1 Calculation ..........................................................................................................................................................................12

10.3 IR-B transmittance ............................................................................................................................................................................12

10.3.1 Calculation ..........................................................................................................................................................................12

10.4 Solar IR transmittance ...................................................................................................................................................................12

10.4.1 Calculation ..........................................................................................................................................................................12

10.5 Test report ................................................................................................................................................................................................12

11 Relative visual attenuation coefficient for traffic signal light detection, Q ..............................13

signal

11.1 Calculation ...............................................................................................................................................................................................13

11.2 Test report ................................................................................................................................................................................................13

12 Spectral reflectance ........................................................................................................................................................................................13

12.1 Uncertainty of measurement ...................................................................................................................................................13

12.2 Position and direction of measurement .........................................................................................................................13

12.2.1 Specular spectral reflectance .............................................................................................................................13

12.2.2 Total spectral reflectance (specular included) .................. ..................................................................13

12.2.3 Total spectral reflectance (specular excluded) ...................................................................................14

12.2.4 0°/45° and 45°/0° geometry ..............................................................................................................................14

12.3 Wavelength intervals ......................................................................................................................................................................14

12.4 Test report ................................................................................................................................................................................................14

13 Luminous reflectance ...................................................................................................................................................................................14

13.1 Calculations .............................................................................................................................................................................................14

13.2 Test report ................................................................................................................................................................................................14

13.3 Luminous reflectance of mesh ................................................................................................................................................14

14 Scattered light ......................................................................................................................................................................................................15

14.1 Wide angle scatter .............................................................................................................................................................................15

14.1.1 Principle ...............................................................................................................................................................................15

14.1.2 Apparatus ............................................................................................................................................................................15

14.1.3 Test sample ........................................................................................................................................................................16

14.1.4 Test procedure ................................................................................................................................................................16

14.1.5 Calculation ..........................................................................................................................................................................16

14.1.6 Test report ..........................................................................................................................................................................17

14.2 Narrow angle scatter ......................................................................................................................................................................17

14.2.1 Principle ...............................................................................................................................................................................17

14.2.2 Test methods ....................................................................................................................................................................18

14.2.3 Test report ..........................................................................................................................................................................23

15 Polarization ............................................................................................................................................................................................................23

15.1 Plane of transmission .....................................................................................................................................................................23

15.1.1 Apparatus ............................................................................................................................................................................23

15.1.2 Test procedure ................................................................................................................................................................23

15.1.3 Test report ..........................................................................................................................................................................24

15.2 Polarizing efficiency ........................................................................................................................................................................24

15.2.1 Principle ...............................................................................................................................................................................24

15.2.2 Test procedure for the spectrophotometric method .....................................................................25

15.2.3 Test report ..........................................................................................................................................................................25

15.2.4 Test procedure for the broadband method ............................................................................................25

15.2.5 Test report ..........................................................................................................................................................................26

16 Photochromic lenses .....................................................................................................................................................................................26

16.1 Light source(s) to approximate the spectral distribution of solar radiation for air

mass 2 for testing ...............................................................................................................................................................................26

16.1.1 Radiation source using one lamp ...................................................................................................................26

16.1.2 Radiation source using two lamps .................. ...............................................................................................27

16.2 Conditioning for luminous transmittance in the faded state .......................................................................27

16.3 Measurement .........................................................................................................................................................................................28

iv © ISO 2020 – All rights reserved
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SIST EN ISO 18526-2:2020
ISO 18526-2:2020(E)

16.3.1 Principle ...............................................................................................................................................................................28

16.3.2 Faded state .........................................................................................................................................................................28

16.3.3 Darkened states .............................................................................................................................................................28

17 Automatic welding filters .........................................................................................................................................................................29

17.1 General ........................................................................................................................................................................................................29

17.2 Luminous transmittance in the light state ...................................................................................................................29

17.2.1 Measurement ...................................................................................................................................................................29

17.2.2 Test report ..........................................................................................................................................................................30

17.3 Luminous transmittance in the dark state ...................................................................................................................30

17.3.1 Measurement ...................................................................................................................................................................30

17.3.2 Test report ..........................................................................................................................................................................30

17.4 Shade number of welding filters with automatic shade number setting ..........................................30

17.4.1 Principle ...............................................................................................................................................................................30

17.4.2 Apparatus ............................................................................................................................................................................31

17.4.3 Test procedure ................................................................................................................................................................31

17.4.4 Test report ..........................................................................................................................................................................31

17.5 Luminous transmittance variation over time............................................................................................................31

17.5.1 Principle ...............................................................................................................................................................................31

17.5.2 Apparatus ............................................................................................................................................................................32

17.5.3 Test procedure ................................................................................................................................................................32

17.5.4 Test report ..........................................................................................................................................................................32

17.6 Blue-light transmittance for artificial sources ..........................................................................................................32

17.6.1 Measurement ...................................................................................................................................................................32

17.6.2 Test report ..........................................................................................................................................................................32

17.7 Uniformity of luminous transmittance for flat filters .................................

...

SLOVENSKI STANDARD
oSIST prEN ISO 18526-2:2018
01-julij-2018

9DURYDQMHRþLLQREUD]D3UHVNXVQHPHWRGHGHO)L]LNDOQHRSWLþQHODVWQRVWL

,62',6

Eye and face protection - Test methods - Part 2 : Physical optical properties (ISO/DIS

18526-2:2018)

Augen- und Gesichtsschutz - Prüfverfahren - Teil 2: Physikalisch optische Eigenschaften

(ISO/DIS 18526-2:2018)

Protection des yeux et du visage - Méthodes d'essai - Partie 2: Propriétés optiques

physiques (ISO/DIS 18526-2:2018)
Ta slovenski standard je istoveten z: prEN ISO 18526-2
ICS:
13.340.20 Varovalna oprema za glavo Head protective equipment
oSIST prEN ISO 18526-2:2018 en

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------
oSIST prEN ISO 18526-2:2018
---------------------- Page: 2 ----------------------
oSIST prEN ISO 18526-2:2018
DRAFT INTERNATIONAL STANDARD
ISO/DIS 18526-2
ISO/TC 94/SC 6 Secretariat: BSI
Voting begins on: Voting terminates on:
2018-05-18 2018-08-10
Eye and face protection — Test methods —
Part 2:
Physical optical properties
Protection des yeux et du visage — Méthodes d'essai —
Partie 2: Propriétés optiques physiques
ICS: 13.340.20
THIS DOCUMENT IS A DRAFT CIRCULATED
This document is circulated as received from the committee secretariat.
FOR COMMENT AND APPROVAL. IT IS
THEREFORE SUBJECT TO CHANGE AND MAY
NOT BE REFERRED TO AS AN INTERNATIONAL
STANDARD UNTIL PUBLISHED AS SUCH.
IN ADDITION TO THEIR EVALUATION AS
ISO/CEN PARALLEL PROCESSING
BEING ACCEPTABLE FOR INDUSTRIAL,
TECHNOLOGICAL, COMMERCIAL AND
USER PURPOSES, DRAFT INTERNATIONAL
STANDARDS MAY ON OCCASION HAVE TO
BE CONSIDERED IN THE LIGHT OF THEIR
POTENTIAL TO BECOME STANDARDS TO
WHICH REFERENCE MAY BE MADE IN
Reference number
NATIONAL REGULATIONS.
ISO/DIS 18526-2:2018(E)
RECIPIENTS OF THIS DRAFT ARE INVITED
TO SUBMIT, WITH THEIR COMMENTS,
NOTIFICATION OF ANY RELEVANT PATENT
RIGHTS OF WHICH THEY ARE AWARE AND TO
PROVIDE SUPPORTING DOCUMENTATION. ISO 2018
---------------------- Page: 3 ----------------------
oSIST prEN ISO 18526-2:2018
ISO/DIS 18526-2:2018(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2018

All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may

be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting

on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address

below or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Fax: +41 22 749 09 47
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2018 – All rights reserved
---------------------- Page: 4 ----------------------
oSIST prEN ISO 18526-2:2018
ISO/DIS 18526-3:2018(E)
Contents

Foreword .................................................................................................................................... vi

1 Scope .................................................................................................................................... 1

2 Normative references ............................................................................................................ 1

3 Terms and definitions ............................................................................................................ 1

4 Preparatory information ....................................................................................................... 2

5 General test requirements..................................................................................................... 2

6 Test methods for measuring transmittance - General............................................................. 2

6.1 Uncertainty of measurement ..................................................................................................... 2

6.2 Reporting compliance ................................................................................................................ 3

6.3 Applicability .............................................................................................................................. 3

6.4 Position and direction of measurement ..................................................................................... 3

6.5 Wavelength intervals ................................................................................................................ 3

6.6 Test reports for spectral values .................................................................................................. 3

7 Luminous transmittance ........................................................................................................ 4

7.1 Calculations of luminous transmittance from spectral values ...................................................... 4

7.2 Test reports for luminous transmittance values.......................................................................... 4

7.3 Broadband method of measurement of luminous transmittance to CIE Source A ........................ 4

7.4 Measurement of uniformity of luminous transmittance ............................................................. 4

7.5 Transmittance matching at right and left reference points .......................................................... 9

8 Ultraviolet transmittance .................................................................................................... 11

8.1 General ................................................................................................................................... 11

8.2 Spectral transmittance and mean spectral transmittance ......................................................... 11

8.3 Solar UV transmittance ............................................................................................................ 11

8.4 Solar UV-A transmittance ........................................................................................................ 11

8.5 Solar UV-B transmittance ........................................................................................................ 11

8.6 Mean 380 to 400 nm transmittance ......................................................................................... 11

8.7 Mean UV-A transmittance ....................................................................................................... 11

8.8 Mean UV-B transmittance ....................................................................................................... 11

8.9 Test report .............................................................................................................................. 11

9 Blue-light transmittance ...................................................................................................... 11

9.1 Solar blue-light transmittance.................................................................................................. 11

9.2 Artificial blue-light transmittance ............................................................................................ 12

10 IR transmittance .............................................................................................................. 13

10.1 Near IR transmittance ............................................................................................................. 13

10.2 IR-A transmittance .................................................................................................................. 13

10.3 IR-B transmittance .................................................................................................................. 13

10.4 Solar IR transmittance ............................................................................................................. 13

10.5 Test report .............................................................................................................................. 13

11 Relative visual attenuation quotient for traffic signal light detection Q ....................... 13

signal

11.1 Calculation .............................................................................................................................. 13

11.2 Test report .............................................................................................................................. 13

12 Spectral reflectance ......................................................................................................... 13

12.1 Uncertainty of measurement ................................................................................................... 13

12.2 Position and direction of measurement ................................................................................... 14

© ISO 2018 – All rights reserved
---------------------- Page: 5 ----------------------
oSIST prEN ISO 18526-2:2018
ISO/DIS 18526-2:2018(E)

12.3 Wavelength intervals .............................................................................................................. 14

12.4 Test reports for spectral values ................................................................................................ 14

13 Luminous reflectance ....................................................................................................... 15

13.1 Calculations ............................................................................................................................ 15

13.2 Test report .............................................................................................................................. 15

13.3 Luminous reflectance of mesh products ................................................................................... 15

14 Scattered light ................................................................................................................. 16

14.1 Wide angle scatter .................................................................................................................. 16

14.2 Narrow angle scatter ............................................................................................................... 18

15 Polarization ..................................................................................................................... 24

15.1 Plane of transmission .............................................................................................................. 24

15.2 Polarizing efficiency ................................................................................................................. 25

16 Photochromic filters ........................................................................................................ 27

16.1 Light source(s) to approximate the spectral distribution of solar radiation for air mass = 2 for

testing 27

16.2 Conditioning for luminous transmittance in the faded state ..................................................... 29

16.3 Measurement ......................................................................................................................... 29

17 Automatic welding filters ................................................................................................. 30

17.1 Luminous transmittance in the light (un-triggered) state .......................................................... 31

17.2 Luminous transmittance in the dark (triggered) state ............................................................... 31

17.3 Shade number of welding filters with automatic shade number setting .................................... 31

17.4 Test for luminous transmittance variation over time ................................................................ 32

17.5 Blue-light transmittance for artificial sources ........................................................................... 33

17.6 Test for angular dependence of luminous transmittance .......................................................... 33

17.7 Combined test for uniformity and angular dependence of luminous transmittance ................... 38

17.8 Uniformity of luminous transmittance ..................................................................................... 40

17.9 Test for switching time ............................................................................................................ 41

17.10 Test for holding time............................................................................................................ 42

17.11 Test for manual control of dark state ................................................................................... 42

17.12 Test for optical sensitivity of welding detection .................................................................... 42

Annex A (informative) Application of uncertainty of measurement ............................................ 50

A.1 Scope ...................................................................................................................................... 50

A.2 Procedure ............................................................................................................................... 50

Annex B (normative) Sources of uncertainty in spectrophotometry and their estimation and

control ....................................................................................................................................... 53

B.1 General ................................................................................................................................... 53

B.2 Principles of spectrophotometers ............................................................................................ 53

B.3 Sources of uncertainty ............................................................................................................. 54

Annex C (informative) Definitions in summation form ............................................................... 61

C.1 Explanation ............................................................................................................................. 61

C.2 Key to symbols ........................................................................................................................ 61

C.3 Definitions in summation form ................................................................................................ 61

Annex D (informative) Spectral functions for the calculation of transmittance and reflectance

values ........................................................................................................................................ 65

D.1 Ultraviolet and blue-light transmittance .................................................................................. 65

D.2 Luminous transmittance and reflectance ................................................................................. 69

D.3 Values for calculation of relative visual attenuation coefficient for traffic signal light recognition

and detection ..................................................................................................................................... 72

© ISO 2018 – All rights reserved
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oSIST prEN ISO 18526-2:2018
ISO/DIS 18526-3:2018(E)

D.4 Values of the solar spectrum for calculation of infrared transmittance and reflectance ............. 76

Annex E (informative) Generic description of automatic welding filters and guidance on

illumination during testing ......................................................................................................... 78

E.1 Generic description of automatic welding filters ...................................................................... 78

E.2 Illumination of automatic welding filters during testing............................................................ 80

Annex F Bibliography ................................................................................................................. 82

© ISO 2018 – All rights reserved
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oSIST prEN ISO 18526-2:2018
ISO/DIS 18526-2:2018(E)
Foreword

ISO (the International Organization for Standardization) is a worldwide federation of national

standards bodies (ISO member bodies). The work of preparing International Standards is normally

carried out through ISO technical committees. Each member body interested in a subject for which a

technical committee has been established has the right to be represented on that committee.

International organizations, governmental and non-governmental, in liaison with ISO, also take part in

the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all

matters of electrotechnical standardization.

The procedures used to develop this document and those intended for its further maintenance are

described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the

different types of ISO documents should be noted. This document was drafted in accordance with the

editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of

any patent rights identified during the development of the document will be in the Introduction and/or

on the ISO list of patent declarations received (see www.iso.org/patents).

Any trade name used in this document is information given for the convenience of users and does not

constitute an endorsement.

For an explanation on the voluntary nature of standards, the meaning of ISO specific terms and

expressions related to conformity assessment, as well as information about ISO's adherence to the

World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see the following

URL: www.iso.org/iso/foreword.html.

The committee responsible for this document is ISO/TC 94, Personal safety — Protective clothing and

equipment, Subcommittee SC 6, Eye and face protection.
A list of all parts in the ISO 18526 series can be found on the ISO website.
© ISO 2018 – All rights reserved
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oSIST prEN ISO 18526-2:2018
ISO/DIS 18526-3:2018(E)
Introduction

This family of documents was developed in response to the worldwide stakeholders' demand for

minimum requirements and test methods for eye and face protectors traded internationally. ISO 4007

gives the terms and definitions for all the various product types. The test methods are in the ISO 18526

series, while the requirements for occupational eye protectors are in the ISO 16321 series. Eye

protection for specific sports is mostly dealt with by the ISO 18527 series. A guidance document for the

selection, use and maintenance of eye and face protectors is in preparation.
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oSIST prEN ISO 18526-2:2018
ISO/DIS 18526-2:2018(E)
© ISO 2018 – All rights reserved
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oSIST prEN ISO 18526-2:2018
ISO/DIS 18526-3:2018(E)
Eye and face protection — Test methods — Part 2: Physical optical
properties
1 Scope

This document specifies the reference test methods for determining the physical optical properties of

personal eye and face protectors.

This document does not apply to any eye and face protection requirements standards for which other

test methods are specified.
Other test methods may be used provided they have been shown to be equivalent.
2 Normative references

The following documents are referred to in the text in such a way that some or all of their content

constitutes requirements of this document. For dated references, only the edition cited applies. For

undated references, the latest edition of the referenced document (including any amendments) applies.

ISO 4007:_, Personal protective equipment – Eye and face protection – Vocabulary

ISO 11664-1 (CIE S 014-1/E), Colorimetry- Part 1: CIE standard colorimetric observers

ISO 11664-2 (CIE S 014-2/E), Colorimetry- Part 2: CIE standard illuminants

Eye and face protection for occupational use – Part 2: Additional requirements for

ISO 16321-2,
protectors during welding and related techniques

ISO 16508 CIE S 006/E: Road traffic lights - Photometric properties of 200 mm roundel signals.

ISO/IEC Guide 98-3, Uncertainty of measurement — Part 3: Guide to the expression of uncertainty in

measurement (GUM: 2008)
CIE 15, Colorimetry. Commission Internationale de l’Éclairage. 2004
CIE S 017, International lighting vocabulary. 2011.
3 Terms and definitions

For the purposes of this document, the terms and definitions given in in ISO 4007 and CIE S 017 apply.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

— IEC Electropedia: available at http://www.electropedia.org/
— ISO Online browsing platform: available at http://www.iso.org/obp

For the purpose of this document, “test sample” is taken to be the object under test, e.g. “ocular”, “lens”,

“filter”, or “complete protector” as specified in the requirements standard.
Under preparation (Stage at the time of publication ISO/FDIS 4007)
Under preparation (Stage at the time of publication ISO/DIS 16321-1)
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oSIST prEN ISO 18526-2:2018
ISO/DIS 18526-2:2018(E)
4 Preparatory information

Before testing, refer to the requirement standard appropriate to the product for the information needed

to apply the tests in this document, for example:
— the number of test samples;
— preparation of test samples;
— the selection of test samples (if included in this part);
— any prior conditioning or testing;
— test method (if more than one is included in this part);
— any deviations from the method(s);
— characteristics to be assessed subjectively (if appropriate);
— pass/ fail criteria.
5 General test requirements

Unless otherwise specified, the values stated in this document are expressed as nominal values. Except

for temperature limits, values that are not stated as maxima or minima should be subject to a tolerance

of ±5%.

Unless otherwise specified, the ambient temperature for testing should be between 16 °C and 32 °C and

any temperature limits specified should be subject to an accuracy of ±1 °C. Relative humidity should be

maintained at (50 ± 20) %.

Unless otherwise specified, the test samples shall be tested at the reference points (for testing) as defined

in ISO 4007.
The tests shall be done by trained observers.
6 Test methods for measuring transmittance - General
6.1 Uncertainty of measurement

Unless otherwise indicated, the measures calculated from spectral transmittance and the broadband

measures of transmittance shall have relative uncertainties less than or equal to those given in Table 1.

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oSIST prEN ISO 18526-2:2018
ISO/DIS 18526-3:2018(E)
Table 1 — Relative uncertainty of measured spectral transmittance
Spectral transmittance value Relative
uncertainty
Less than % to %
100 17,8 ±5
17,8 0,44 ±10
0,44 0,023 ±15
0,023 0,0012 ±20
0,0012 0,000023 ±30
The application of uncertainty to compliance is set out in Annex A.

The general methods of evaluating the components of uncertainty are set out in ISO/IEC Guide 98/3;

Annex B in this document is a guide to the sources of uncertainty in spectrophotometry, their

evaluation and minimization.
6.2 Reporting compliance

Any compliance statement based on values reported from these test methods shall take into account the

uncertainty of measurement as set out in Annex A.
6.3 Applicability

This spectrophotometric method applies to measurement of transmittance regardless of the test sample

tested, e.g. filters and frames. Assessment of the uncertainty of measurement shall, if necessary, include

the consequences of non-parallel surfaced test samples.
6.4 Position and direction of measurement

The location and direction of measurement of transmittance shall be as specified in the relevant

requirement standard. If the measurements are not made normal to the surface of the test sample, then

particular attention should be paid to the effects of beam displacement, see Annex B. If the direction of

measurement is not specified, then it shall be measured normal to the surface of the test sample at the

geometrical centre.

Unless otherwise stated, transmittance is measured as direct transmittance (diffuse component

excluded).

The test beam shall be incident normally on the surface and any divergence or convergence of the beam

shall not result in an uncertainty of measurement exceeding those in Table 1.
6.5 Wavelength intervals

Spectral measurements and calculations shall be carried out at not more than 5 nm intervals (∆λ = 5 nm)

in the ultraviolet-visible region (180-780 nm) and not more than 10 nm in the infrared region (780-

3000 nm). The necessary data for calculations at these intervals are provided in Annex D. If smaller

intervals are used then linesar interpolation of the Annex D data is appropriate.

6.6 Test reports for spectral values

The spectral transmittances and the associated uncertainties of measurement shall be reported as

required in the document(s) referencing these methods.
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oSIST prEN ISO 18526-2:2018
ISO/DIS 18526-2:2018(E)
7 Luminous transmittance
7.1 Calculations of luminous transmittance from spectral values

Luminous transmittance is calculated as a percentage from the spectral transmittances determined

hereafter and with reference to a standard observer and a source or illuminant. For the purposes of this

document, all calculations use the CIE 2° standard observer (ISO 11664-1) and CIE standard illuminant

A and/or CIE standard illuminant D65 (ISO 11664-2) and/or a Planckian Radiator of distribution

temperature 1900K. See ISO 4007:–, 3.9.1.32 and Annex C in this document.
7.2 Test reports for luminous transmittance values

The luminous transmittance(s), the applicable illuminant(s) and/or source(s) and the associated

uncertainty of measurement shall be reported as required in the document(s) referencing these

methods.
7.3 Broadband method of measurement of luminous transmittance to CIE Source A
7.3.1 Apparatus

The luminous transmittance is measured by using a test apparatus consisting of a light source and a

detector. The light source shall be a broadband collimated light source with approximately the spectral

distribution of the CIE standard source A (ISO 11664-2). The detector shall have a spectral response

corresponding to CIE 2˚ standard observer (ISO 11664-1). The detector shall be mounted normal to the

beam of illumination.
7.3.2 Calibration

The broadband method shall be calibrated by comparison with filters for which the luminous

transmittances are known with uncertainties of measurement sufficiently small as to enable the

applicable requirement of Table 1 to be met by the test method. The maximum difference in shade

number between the test sample and the nearest reference filter shall ensure compliance with Table 1.

7.3.3 Procedure

The luminous transmittance is measured as the ratio of the light transmitted by the test sample to the

incident light measured with no test sample in the light beam.

If the direction of measurement is not specified, measurement shall be with incident radiation normal

to the surface of the test sample. If the position of measurement is not specified, the geometric centre of

the test sample shall be used.
7.3.4 Test reports for luminous transmittance values

The luminous transmittance(s), the applicable source (CIE source A) and the associated uncertainty of

measurement shall be reported as required in the document(s) referencing these methods.

7.4 Measurement of uniformity of luminous transmittance
7.4.1 Unmounted filter covering one eye
7.4.1.1 Test method

Locate the reference point defined in ISO 4007. Determine a circular area around the reference point

with diameter 𝑑𝑑, calculated as follows, (see Figure 1):
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oSIST prEN ISO 18526-2:2018
ISO/DIS 18526-3:2018(E)

— for test samples equal to or greater than 50 mm in the vertical dimension at the reference

point, 𝑑𝑑 = (40,0 ± 0,5) mm;

— for test samples less than 50 mm in the vertical dimension at the reference point,

𝑑𝑑 =((h-10)±0,5)mm, where h is the vertical depth of test sample.

If a 5 mm wide portion around the edge of the test sample intrudes into this circular area, then this

intrusion shall be excluded from testing.

Scan this circular area with beam of light of 5 mm nominal diameter, incident normally on the surface of

the test sample. Use either white light and a detector whose spectral responsivity approximates that of

the CIE 2° standard observer (ISO 11664-1) or use or a narrow spectral band of light with a maximum

spectral energy at (555 ± 25) nm (the spectral sensitivity of the detector does not influence the

measurement). The effects of displacement of the light beam by any prismatic effect of the test sample

(see B.3.4.1) shall be compensated for. If necessary to demonstrate compliance, the effects of variation

of thickness of
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