EN 4476:2019

SLOVENSKI STANDARD
01-december-2019
Nadomešča:
SIST EN 4476:2011
Aeronavtika - Barve in laki - Vmesni premaz, ki se suši pri sobni temperaturi
Aerospace series - Paints and varnishes - Cold curing intermediate coat
Luft- und Raumfahrt - Beschichtungsstoffe - Zwischenbeschichtung
raumtemperaturhärtend
Série aérospatiale - Peintures et vernis - Couche intermédiaire polymérisant à
température ambiante
Ta slovenski standard je istoveten z: EN 4476:2019
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
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN 4476
EUROPEAN STANDARD
NORME EUROPÉENNE
September 2019
EUROPÄISCHE NORM
ICS 49.040 Supersedes EN 4476:2011
English Version
Aerospace series - Paints and varnishes - Cold curing
intermediate coat
Série aérospatiale - Peintures et vernis - Couche Luft- und Raumfahrt - Beschichtungsstoffe -
intermédiaire polymérisant à température ambiante Zwischenbeschichtung raumtemperaturhärtend
This European Standard was approved by CEN on 26 May 2019.

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
© 2019 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 4476:2019 E
worldwide for CEN national Members.

Contents Page
European foreword . 3
Introduction . 4
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 6
4 Classification . 7
5 Batch release and qualification testing . 7
6 Designation . 12
Annex A (normative) Method for the determination of ability to selectively remove the finish . 13
Annex B (normative) Method for the determination of ability to restore the paint system after
removal . 14
Annex C (normative) Composition of reference paint remover . 15
Annex D (informative) Evolution sheet . 16
Bibliography . 17

European foreword
This document (EN 4476:2019) 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 Standard 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 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 March 2020, and conflicting national standards shall be
withdrawn at the latest by March 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.
This document supersedes EN 4476:2011
According to the CEN-CENELEC Internal Regulations, the national standards organisations 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.
Introduction
The intermediate coating to this document incorporated in a paint scheme between primer and topcoat
finish will allow selective removal of top coat finish using a benzyl alcohol-based paint remover. An
example for the composition of a benzyl alcohol based is given in Annex C. If not otherwise agreed
between manufacturer and purchaser of intermediate coating benzyl alcohol mixtures diluted with
approximate 60 % water can be used for testing.
The paint scheme, including this intermediate coating is intended for application to metallic and non-
metallic surfaces to provide equivalent protection against corrosion, mechanical damage and resistance
to aircraft fluids so that provided by a paint scheme consisting of primer and topcoat paint.
Primer and topcoat used in combination with intermediate coating to this standard has to be defined by
customer. Pre-treatment of test specimens for primer paint application to be defined by customer.
1)
Table 1 — Coatings
Primer
EN 2435-1 to EN 2435-5 Corrosion resistant chromated two component cold curing primer
Corrosion resistant chromate free two component cold curing epoxy
EN 2436-1 to EN 2436-6
primer
Chromate free non corrosion inhibiting two components cold curing
EN 4687
primer for military application
Corrosion inhibiting two components cold curing primer for military
EN 4688
application
Top Coats
EN 2434-1 to EN 2434-5 Two component cold curing polyurethane finish
Two components cold curing polyurethane finish - High flexibility and
EN 4689
chemical agent resistance for military application

1) If not otherwise agreed between manufacturer and customer following primers and topcoats can be used for
qualification of intermediate primer to this document.
1 Scope
This document specifies the requirements for an intermediate coat to be applied over a primer for
aerospace applications and with a topcoat for aerospace applications on top.
The properties specified in this document are obtained on defined aluminium alloy test pieces prepared
in accordance with EN 3837 and EN ISO 3270 and painted with primer listed in Table 1. Topcoat listed in
Table 1 is to be applied on intermediate coat to this document. The ability of the material to be used for
a specific application (e.g. alternative substrate, alternative primer, specific drying conditions, etc.)
should be determined by supplementary tests to confirm that the requirements of this document are met.
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 2334, Aerospace series — Chromic-sulphuric acid pickle of aluminium and aluminium alloys
EN 2379, Aerospace series — Fluids for assessment of non-metallic materials
EN 2435 (all parts), Aerospace series — Paints and varnishes — Corrosion resistant chromated two
component cold curing primer
EN 3837, Aerospace series — Paints and varnishes — Nature and methods for surface preparation of test
2)
pieces in aluminium alloys
EN 3840,Aerospace series — Paints and varnishes — Technical specification
EN 4160, Aerospace series — Paints and varnishes — Determination of the effect of thermal exposure
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 1520, Paints and varnishes — Cupping test
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 (all parts), Paints and varnishes — Determination of density
EN ISO 2812-2, Paints and varnishes — Determination of resistance to liquids — Part 2: Water immersion
method
2) Published as ASD-STAN Prestandard at the date of publication of this standard by AeroSpace and Defence
industries Association of Europe - Standardization (ASD-STAN), http://www.asd-stan.org/
EN ISO 2884-1, Paints and varnishes — Determination of viscosity using rotary viscometers — Part 1: Cone-
and-plate viscometer operated at a high rate of shear
EN ISO 3251, Paints, varnishes and plastics — Determination of non-volatile-matter content
EN ISO 3270, Paints and varnishes and their raw materials — Temperatures and humidities for
conditioning and testing
EN ISO 3679, Determination of flash point — Rapid equilibrium closed cup method
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 9514, Paints and varnishes — Determination of the pot life of multicomponent coating systems —
Preparation and conditioning of samples and guidelines for testing
EN ISO 11890-1, Paints and varnishes — Determination of volatile organic compound (VOC) content —
Part 1: Difference method
ISO 3696, Water for analytical laboratory use — Specification and test methods
ISO 3847, Liquid flow measurement using end depth method in channels with a free overfall
ISO 4618, Paints and varnishes — Terms and definitions
ISO 18481, Liquid flow measurement using end depth method in channels with a free overfall
SAE MA 4872 A, Paint Stripping of Commercial Aircraft — Evaluation of Materials and Process
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 4618 and the following 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 Classification
Not applicable.
5 Batch release and qualification testing
5.1 Batch release testing
For batch acceptance the tests marked with an * shall be performed.
5.2 Qualification tests
For product qualification, all tests mentioned in this document in Table 2 to Table 5, shall be performed.
Table 2 — General requirements — Application
Characteristic Requirements
Single or two component cold curing intermediate coat
Material description
Not restricted
Formulation
Activator — if required
Thinner — if required
If more than one component these components shall be mixed in
Preparation
simple whole number proportions, by volume or by mass, in
accordance with the manufacturer’s instructions.
See EN 3840.
Technical specification
See EN 3840.
Visual colour
See EN ISO 1513.
Freedom from defects
Dry film thickness of (15 ± 5) µm unless otherwise specified by the
Application and use
manufacturer.
See EN 3840.
Storage time / Shelf life
Drying time seven days before testing under conditions listed in
Drying conditions
EN ISO 3270 unless otherwise specified.
Drying time of intermediate coating unless otherwise specified by the
manufacturer: 4 h to 16 h after application on primer before
application of topcoat.
See EN 3840.
Quality assurance
Intermediate Coat EN 4476
Designation
See EN 3840.
Packaging
See EN 3840.
Identification marking
See EN 3840.
Flash point
See EN ISO 3679.
a a
base activator thinner
b b b
°C ≥ reference value ≥ reference value ≥ reference value

See EN 3840.
Health and safety
a Test only if component is present.
b The reference value is that established during qualification.

Table 3 — Physical and chemical characteristics — Delivery conditions (1 of 2)
Tests
according
Characteristic Requirements
to
EN 3840
-* Conditio
...