Aerospace series - Paints and varnishes - Corrosion resistant chromated two-components room temperature curing epoxy primer - High corrosion resistance for military application

This document defines the requirements for a two-components, high corrosion inhibiting epoxy primer.
The coating shall be suitable for use on suitably prepared metallic substrates, chromic acid anodised, or conversion coated aluminium alloys and other suitably prepared substrates.

Luft- und Raumfahrt - Beschichtungsstoffe - Zweikomponenten-Epoxid-Grundierung, chromathaltig, korrosionsbeständig, raumtemperaturhärtend - Hohe Korrosionsbeständigkeit für militärische Anwendung

Dieses Dokument legt die Anforderungen an eine Zweikomponenten-Epoxid-Grundierung, hochkorrosionsbeständig, fest.
Die Beschichtung wird auf geeignet hergestellten metallischen Substraten, mit Chromsäure anodisierten oder mit Umwandlungsschichten versehenen Aluminiumlegierungen und anderen geeignet hergestellten Substraten angewendet.

Série aérospatiale - Peintures et vernis - Peinture primaire époxy anticorrosion chromatée à deux composants polymérisant à température ambiante - Haute résistance à la corrosion pour applications militaires

Le présent document définit les exigences relatives aux peintures primaires époxy à deux composants, haute résistance à la corrosion.
La peinture doit être adaptée à une utilisation sur les substrats métalliques convenablement préparés, les alliages d'aluminium anodisés à l’acide chromique ou chromatés et autres substrats convenablement préparés.

Aeronavtika - Barve in laki - Dvokomponentni temeljni premaz, korozijsko obstojen, kromiran, ki se suši pri sobni temperaturi - Visoka korozijska odpornost, 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 4688:2021
01-marec-2021
Nadomešča:
SIST EN 4688:2012
Aeronavtika - Barve in laki - Dvokomponentni temeljni premaz, korozijsko

obstojen, kromiran, ki se suši pri sobni temperaturi - Visoka korozijska odpornost,

za vojaško uporabo
Aerospace series - Paints and varnishes - Corrosion resistant chromated two-
components room temperature curing epoxy primer - High corrosion resistance for
military application
Luft- und Raumfahrt - Beschichtungsstoffe - Zweikomponenten-Epoxid-Grundierung,
chromathaltig, korrosionsbeständig, raumtemperaturhärtend - Hohe
Korrosionsbeständigkeit für militärische Anwendung
Série aérospatiale - Peintures et vernis - Peinture primaire époxy anticorrosion

chromatée à deux composants polymérisant à température ambiante - Haute résistance

à la corrosion pour applications militaires
Ta slovenski standard je istoveten z: EN 4688:2021
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 4688:2021 en,fr,de

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

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SIST EN 4688:2021
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SIST EN 4688:2021
EN 4688
EUROPEAN STANDARD
NORME EUROPÉENNE
January 2021
EUROPÄISCHE NORM
ICS 49.040 Supersedes EN 4688:2012
English Version
Aerospace series - Paints and varnishes - Corrosion
resistant chromated two-components room temperature
curing epoxy primer - High corrosion resistance for
military application

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

primaire époxy anticorrosion chromatée à deux Zweikomponenten Grundierung, chromathaltig,

composants polymérisant à température ambiante - korrosionsschützend, raumtemperaturhärtend - Hoher

Haute résistance à la corrosion pour applications Korrosionsschutz für militärische Anwendung

militaires
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 4688:2021 E

worldwide for CEN national Members.
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SIST EN 4688:2021
EN 4688:2021 (E)
Contents Page

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

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

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

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

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

5 Classification..................................................................................................................................................... 6

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

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

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

6.3 Batch acceptance testing .............................................................................................................................. 7

6.4 Purchaser batch release testing ................................................................................................................ 7

7 Designation ..................................................................................................................................................... 18

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SIST EN 4688:2021
EN 4688:2021 (E)
European foreword

This document (EN 4688:2021) 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 4688:2012.

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 4688:2021
EN 4688:2021 (E)
1 Scope

This document defines the requirements for a two-components, high corrosion inhibiting epoxy primer.

The coating applies to suitably prepared metallic substrates, chromic acid anodised, or conversion

coated aluminium alloys and other suitably prepared substrates.
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 3665, Aerospace series — Test methods for paints and varnishes — Filiform corrosion resistance test

on 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 4689, Aerospace series — Paints and varnishes — Two-components room temperature curing

polyurethane finish — High flexibility and chemical agent 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 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

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

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SIST EN 4688:2021
EN 4688:2021 (E)

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 4628-10, Paints and varnishes — Evaluation of degradation of coatings — Designation of quantity

and size of defects, and of intensity of uniform changes in appearance — Part 10: Assessment of degree of

filiform corrosion

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

ISO 3270, Paints and varnishes and their raw materials — Temperatures and humidities for conditioning

and testing

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)

And all its parts quoted in this document.

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

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SIST EN 4688:2021
EN 4688:2021 (E)

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
ASTM B117, Standard Practice for Operating Salt Spray (Fog) Apparatus

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

Designation: PX-24
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: Chromic 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

5 Classification
The primer is classified according to the following types:
TYPE I: Standard solvent content (VOC < 680 g/l)
TYPE II: Low volatile organic content (VOC < 350 g/l)
TYPE III: Waterborne (VOC < 250 g/l)

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

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SIST EN 4688:2021
EN 4688:2021 (E)
6 Batch release and qualification testing
6.1 General

The general requirements for qualification and batch release testing shall be in accordance with ( i.a.w.)

EN 3840 and the applicable appendix for the specific material.
6.2 Qualification tests

For product qualification, all tests defined in this document, in Table 2 to Table 7, shall be performed.

A minimum of 3 (three) batches shall be tested for qualification purposes.
6.3 Batch acceptance 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 specification have been performed for batch acceptance tests.

6.4 Purchaser batch release testing

The Purchaser may perform any of the tests of this specification deemed necessary to ensure continuing

uniform quality in material shipments.
Table 1 — General requirements
Material description Primer, corrosion inhibiting, for aerospace applications
Base
Formulation Curing agent
Thinner – if appropriate
These components shall be mixe
...

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