Aerospace series - Paints and varnishes - Two-components room temperature curing polyurethane finish - High flexibility and chemical agent resistance for military application

This document specifies the requirements for a two-components flexible polyurethane topcoat to be applied over EN 4687 and/or EN 4688 primers mainly for exterior aerospace applications.
The primer and the finish tested to this document will be from the same manufacturer applied in accordance with (i.a.w.) their instructions/Table 1.

Luft- und Raumfahrt - Beschichtungsstoffe - Zweikomponenten-Polyurethan-Deckbeschichtung, raumtemperaturhärtend - Hohe Verformbarkeit und Beständigkeit gegen Chemikalien für militärische Anwendung

Dieses Dokument legt die Anforderungen an eine verformbare Zweikomponenten-Polyurethan-Deckbeschich¬tung fest, die auf Grundbeschichtungen nach EN 4687 und/oder EN 4688 aufzubringen und hauptsächlich für Anwendungen im Außenbereich in der Luft- und Raumfahrt vorgesehen ist.
Der Grundbeschichtungsstoff und der Deckbeschichtungsstoff, die nach diesem Dokument geprüft werden, sind von demselben Hersteller und werden nach dessen Anweisungen (Tabelle 1) aufgetragen.

Série aérospatiale - Peintures et vernis - Peinture de finition polyuréthane à deux composants polymérisant à température ambiante - Haute flexibilité et résistance aux substances chimiques pour applications militaires

Le présent document spécifie les exigences relatives aux couches de finition polyuréthane souples à deux composants, à appliquer sur les peintures primaires EN 4687 et/ou 4688 pour applications aérospatiales extérieures.
La peinture primaire et la couche de finition soumises à essais selon le présent document doivent provenir du même fabricant et être appliquées conformément à leurs instructions/au Tableau 1.

Aeronavtika - Barve in laki - Dvokomponentni poliuretanski lak, ki se strdi pri temperaturi okolja - Zelo elastičen in odporen proti kemikalijam, za vojaško uporabo

General Information

Status
Published
Publication Date
10-Feb-2021
Technical Committee
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
21-Jan-2021
Due Date
28-Mar-2021
Completion Date
11-Feb-2021

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SLOVENSKI STANDARD
SIST EN 4689:2021
01-marec-2021
Nadomešča:
SIST EN 4689:2012
Aeronavtika - Barve in laki - Dvokomponentni poliuretanski lak, ki se strdi pri
temperaturi okolja - Zelo elastičen in odporen proti kemikalijam, za vojaško
uporabo
Aerospace series - Paints and varnishes - Two-components room temperature curing

polyurethane finish - High flexibility and chemical agent resistance for military application

Luft- und Raumfahrt - Beschichtungsstoffe - Zweikomponenten-Polyurethan-
Deckbeschichtung, raumtemperaturhärtend - Hohe Verformbarkeit und Beständigkeit
gegen Chemikalien für militärische Anwendung

Série aérospatiale - Peintures et vernis - Peinture de finition polyuréthane à deux

composants polymérisant à température ambiante - Haute flexibilité et résistance aux

substances chimiques pour applications militaires
Ta slovenski standard je istoveten z: EN 4689:2021
ICS:
49.040 Prevleke in z njimi povezani Coatings and related
postopki, ki se uporabljajo v processes used in aerospace
letalski in vesoljski industriji industry
87.040 Barve in laki Paints and varnishes
95.020 Vojaštvo na splošno Military in general
SIST EN 4689:2021 en,fr,de

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

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SIST EN 4689:2021
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SIST EN 4689:2021
EN 4689
EUROPEAN STANDARD
NORME EUROPÉENNE
January 2021
EUROPÄISCHE NORM
ICS 49.040 Supersedes EN 4689:2012
English Version
Aerospace series - Paints and varnishes - Two-components
room temperature curing polyurethane finish - High
flexibility and chemical agent resistance for military
application

Série aérospatiale - Peintures et vernis - Peinture de Luft- und Raumfahrt - Beschichtungsstoffe -

finition polyuréthane à deux composants polymérisant Zweikomponenten Polyurethan- Decklack,

à température ambiante - Haute flexibilité et résistance raumtemperaturhärtend - Hohe Elastizität und

aux substances chimiques pour applications militaires Beständigkeit gegen Chemikalien für militärische

Anwendun
This European Standard was approved by CEN on 2 November 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

© 2021 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 4689:2021 E

worldwide for CEN national Members.
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SIST EN 4689:2021
EN 4689:2021 (E)
Contents Page

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

1 Scope .................................................................................................................................................................... 4

2 Normative references .................................................................................................................................... 4

3 Terms and definitions ................................................................................................................................... 6

4 Surface pretreatments .................................................................................................................................. 6

5 Classification..................................................................................................................................................... 7

6 Batch release and qualification testing ................................................................................................... 7

6.1 General................................................................................................................................................................ 7

6.2 Qualification tests ........................................................................................................................................... 7

6.3 Batch release testing ...................................................................................................................................... 7

7 Requirements for fibre reinforced composites ................................................................................. 19

8 Designation ..................................................................................................................................................... 20

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SIST EN 4689:2021
EN 4689:2021 (E)
European foreword

This document (EN 4689:2021) has been prepared by the Aerospace and Defence Industries

Association of Europe — Standardization (ASD-STAN).

After enquiries and votes carried out in accordance with the rules of this Association, this

document has received the approval of the National Associations and the Official Services of the

member countries of ASD, prior to its presentation to CEN.

This document shall be given the status of a national standard, either by publication of an identical

text or by endorsement, at the latest by July 2021, and conflicting national standards shall be

withdrawn at the latest by July 2021.

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.

This document supersedes EN 4689:2012.

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

following countries are bound to implement this document: 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.
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SIST EN 4689:2021
EN 4689:2021 (E)
1 Scope

This document specifies the requirements for a two-components flexible polyurethane topcoat to be

applied over EN 4687 and/or EN 4688 primers mainly for exterior aerospace applications.

The primer and the finish tested to this document will be from the same manufacturer applied in

accordance with (i.a.w.) their instructions/Table 1.
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.

EN 2101, Aerospace series — Chromic acid anodizing of aluminium and wrought aluminium alloys

EN 2334, Aerospace series — Chromic-sulphuric acid pickle of aluminium and aluminium alloys

EN 2437, Aerospace series — Chromate conversion coatings (yellow) for aluminium and aluminium alloys

EN 3837, Aerospace series — Paints and varnishes — Nature and method for surface preparation of test

pieces in aluminium alloys
EN 3840, Aerospace series — Paints and varnishes — Technical specification

EN 3847, Aerospace series — Paints and varnishes — Determination of sedimentation rating

EN 4160, Aerospace series — Paints and varnishes — Determination of the effect of thermal exposure

EN 4687, Aerospace series — Paints and varnishes — Chromate free (non corrosion inhibiting)

two-components room temperature curing primer — Chromate free primer for military application

EN 4688, Aerospace series — Paints and varnishes — Corrosion resistant chromated two-components

room temperature curing epoxy primer — High corrosion resistance for military application

EN 4704, Aerospace series — Tartaric-Sulphuric-Acid anodizing of aluminium and aluminium wrought

alloys for corrosion protection and paint pre-treatment (TSA)

EN 6042, Aerospace series — Organic compounds — Test method — Analysis by infrared spectroscopy

EN ISO 1513, Paints and varnishes — Examination and preparation of test samples

EN ISO 1518-1, Paints and varnishes — Determination of scratch resistance — Part 1: Constant-loading

method
EN ISO 1519, Paints and varnishes — Bend test (cylindrical mandrel)
EN ISO 1520, Paints and varnishes — Cupping test

EN ISO 1524, Paints, varnishes and printing inks — Determination of fineness of grind

EN ISO 2409, Paints and varnishes — Cross-cut test

EN ISO 2431, Paints and varnishes — Determination of flow time by use of flow cups

EN ISO 2811-1, Paints and varnishes — Determination of density — Part 1: Pycnometer method

Published as ASD-STAN Standard at the date of publication of this document by AeroSpace and Defence industries

Association of Europe — Standardization (ASD-STAN), http://www.asd-stan.org/
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SIST EN 4689:2021
EN 4689:2021 (E)

EN ISO 2811-2, Paints and varnishes — Determination of density — Part 2: Immersed body (plummet) method

EN ISO 2811-3, Paints and varnishes — Determination of density — Part 3: Oscillation method

EN ISO 2811-4, Paints and varnishes — Determination of density — Part 4: Pressure cup method

EN ISO 2812-1, Paints and varnishes — Determination of resistance to liquids — Part 1: Immersion in

liquids other than water

EN ISO 2812-2, Paints and varnishes — Determination of resistance to liquids — Part 2: Water immersion

method

EN ISO 2813, Paints and varnishes — Determination of gloss value at 20°, 60° and 85°

EN ISO 3251, Paints, varnishes and plastics — Determination of non-volatile-matter content

EN ISO 3675, Crude petroleum and liquid petroleum products — Laboratory determination of density —

Hydrometer method

EN ISO 3679, Determination of flash no-flash and flash point — Rapid equilibrium closed cup method

EN ISO 4628-2, Paints and varnishes — Evaluation of degradation of coatings — Designation of quantity

and size of defects, and of intensity of uniform changes in appearance — Part 2: Assessment of degree of

blistering

EN ISO 4628-8, Paints and varnishes — Evaluation of degradation of coatings — Designation of quantity

and size of defects, and of intensity of uniform changes in appearance — Part 8: Assessment of degree of

delamination and corrosion around a scribe or other artificial defect

EN ISO 6270-1, Paints and varnishes — Determination of resistance to humidity — Part 1: Condensation

(single-sided exposure)

EN ISO 9117-1, Paints and varnishes — Drying tests — Part 1: Determination of through-dry state and

through-dry time

EN ISO 9117-3, Paints and varnishes — Drying tests — Part 3: Surface-drying test using ballotini

EN ISO 9117-6, Paints and varnishes — Drying tests — Part 6: Print-free test
EN ISO 9227, Corrosion tests in artificial atmospheres — Salt spray tests

EN ISO 9514, Paints and varnishes — Determination of the pot life of multicomponent coating systems —

Preparation and conditioning of samples and guidelines for testing
EN ISO 11664- , Colorimetry

EN ISO 11890-1, Paints and varnishes — Determination of volatile organic compound (VOC) content —

Part 1: Difference method

EN ISO 11909, Binders for paints and varnishes — Polyisocyanate resins — General methods of test

EN ISO 16474-1, Paints and varnishes — Methods of exposure to laboratory light sources — Part 1:

General guidance

EN ISO 16474-3, Paints and varnishes — Methods of exposure to laboratory light sources — Part 3:

Fluorescent UV lamps
And all its parts quoted in this document.
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SIST EN 4689:2021
EN 4689:2021 (E)

MIL-PRF-5606H, Performance specification: Hydraulic fluid, petroleum base; aircraft, missile, and

ordnance. (NATO H-515)

MIL-PRF-6081D, Performance specification: Lubricating oil, jet engine. (NATO O-133)

MIL-PRF-23699F, Performance specification: Lubricating oil, aircraft turbine engine, synthetic base,

NATO code number O-156

MIL-DTL-83133G, Detail specification: Turbine fuel, aviation, kerosene type, JP-8 (NATO F-34), NATO F-35,

and JP-8+100 (NATO F-37)

AMS 1526B, Cleaner for aircraft exterior surfaces water-miscible, pressure- spraying type

AMS 1527B, Cleaner for aircraft exterior surfaces water-miscible, foam-on, pressure-spraying

AMS 1533A, Cleaner for exterior aircraft surfaces gel-type, solvent-base

DEF STAN 68-10 Issue 5, Corrosion Preventive, Water Displacing NATO Code: C-634 Joint Service

Designation: PX-24

BS 1595-1:1986, Propan-2-ol (isopropyl alcohol) for industrial use — Part 1: Specification for propan-2-ol

(isopropyl alcohol)
3 Terms and definitions

For the purposes of this document, the terms and definitions given in EN 3840 apply.

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

• ISO Online browsing platform: available at http://www.iso.org/obp
• IEC Electropedia: available at http://www.electropedia.org/
4 Surface pretreatments

In accordance with EN 3837, the surface pretreatments applicable to aluminium alloy test panels are

the following:
EN 3837 — Procedure A: Sulfochromic pickling in accordance with EN 2334
EN 3837 — Procedure B: Chromate acid anodizing in accordance with EN 2101
EN 3837 — Procedure C: Chromate conversion coating in accordance with EN 2437

EN 3837 — Procedure D: Tartaric-Sulphuric-Acid anodizing in accordance with EN 4704

Published by: DoD National (US) MIL. Department of Defense http://www.defenselink.mil/.

Published by: SAE International (US) Society of Automotive Engineers http://www.sae.org/.

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SIST EN 4689:2021
EN 4689:2021 (E)
5 Classification
The topcoat is classified according to the following types:
TYPE I: Standard solvent content (≤ 680 g/l);
TYPE II: Low volatile organic content (≤ 420 g/l);
TYPE III: Waterborne (≤ 250 g/l).
6 Batch release and qualification testing
6.1 General

The general requirements for qualification and batch release testing shall be in accordance with

EN 3840. A minimum of 3 (three) batches shall be tested for qualification purposes.

6.2 Qualification tests

For product qualification, all tests defined in this document, in Table 2 to Table 8, shall be performed.

The test work to be undertaken for product qualification shall be in accordance with this document.

In addition, the requirements for qualification of coatings in specific colours/gloss levels, shall be as

defined in EN 3840.
6.3 Batch release testing

The Manufacturer shall give evidence on the Test Report or the Certificate of Conformance that all the

tests marked with the symbol * in this document shall be performed for batch acceptance tests.

Table 1 — General requirements
Material description Two components cold curing polyurethane topcoat
Base: hydroxyl functional polyester or acrylic resins
Formulation Curing agent: a polyisocyanate activator solution
Thinner: if required
These components shall be mixed in simple proportions, by volume or weight,
Preparation
in accordance with the manufacturers' instructions.
Technical specification EN 3840
Marking EN 3840
Storage stability EN 3840
Application and use In accordance with manufacturers' instructions.
(23 ± 2) °C/(50 ± 5) % RH for 7 (seven) days before testing.
Drying conditions
Finish is applied to the primer (EN 4687 or EN 4688) following drying of the
primer for 4 (four) hours to 6 (six) hours as specified.
Quality assurance EN 3840
Designation Flexible polyurethane topcoat
Packaging EN 3840
Health and safety EN 3840
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SIST EN 4689:2021
EN 4689:2021 (E)
Table 2 — Physical and chemical characteristics — Delivery conditions (1 of 3)
Tests
according Test Test criteria Test requirements
to EN 3840
Test method EN ISO 1513 (As received in original container)
Shall be free from extraneous matter and show no skinning,
gelling, hard settlement or other defect which will prevent
* satisfactory application to produce a defect free film. The
— Condition
Requirements
base material and curing agent shall each be in a condition
such that stirring easily produces a smooth, uniform
material which, after mixing in the proportion specified by
the manufacturer, shall be suitable for spray application.
Test method EN ISO 3251
Non-volatile Base Curing agent Thinner
matter
Requirements
± 2 % ref. ± 2 % ref.
m/m
a,b a,b
value value
Test method EN ISO 11890-1
Volatile organic
49 Test condition Base + Curing agent + Thinner
content (VOC)
Requirements g/l < values stated in Clause 5
Test method EN ISO 3679
Base Curing agent Thinner
7 Flash point
Requirements °C
≥ Reference ≥ Reference ≥ Reference
a a a
value value value
Test method EN ISO 2431 (cup 3 or cup 4)
8 Flow time Test condition Base + Curing agent + Thinner
a,b
Requirements s ± 10 % Reference value
Test method EN 3847
Sedimentation
5 Test condition Base + Curing agent + Thinner
rating
Requirements ml/4 h ≤ 30
Test method EN ISO 2811-1 to EN ISO 2811-4 or ISO 3675
Test condition (23 ± 2) °C/(50 ± 5) % RH
3 Density 3
g/cm Base Curing agent Thinner
Requirements 3 3 3 3
± 0,03 g/cm ± 0,03 g/cm ± 0,03 g/cm ± 0,03 g/cm
ref value ref value ref value ref value
Test method EN ISO 11909
Test condition —
16 Isocyanate value
Base Curing agent Thinner
Requirements —
Reference
— —
value
See Subclause 6.3.
a b
The deviation is that compared to the reference value (see ).
The reference value is that established during qualification.
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SIST EN 4689:2021
EN 4689:2021
...

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