SIST EN 4170:2008

Aerospace series - Paints and varnishes - Test method for measurement of resistance to cold crack temperature cycle

This standard describes a procedure of ageing to assess the resistance of a coated panel (metallic or organic substrate) to a temperature cycle (cold, hot, hot and wet) for aerospace purposes.
This test deals with the assessment of the capability of the paint to support modification of internal stresses without any crack formation, peeling or other defects due to modification of the mechanical properties of the paint system.

Luft- und Raumfahrt - Anstrichstoffe - Beständigkeit gegen thermische Kreisläufe

Diese Norm legt ein Alterungsverfahren zum Bewerten der Beständigkeit einer beschichteten Platte (metallisches oder organisches Substrat) gegen zyklische Temperaturbelastung (kalt, heiß, heiß und feucht) fest.
Diese Prüfung behandelt die Bewertung des Vermögens der Beschichtung, einer Veränderung der inneren Spannungen ohne Rissbildung, Abschälen oder andere Schäden infolge veränderter mechanischer Eigenschaften des Beschichtungssystems zu folgen.

Série aérospatiale - Peintures et vernis - Méthode de test pour mesurer la résistance aux cycles de basse température

Aeronavtika - Barve in laki - Metoda merjenja odpornosti proti razpokam pri cikličnem izpostavljanju nizki temperaturi

General Information

• Status: Published
• Publication Date: 13-Jul-2008
• ICS: 49.040 - Coatings and related processes used in aerospace industry
• Technical Committee: I13 - Imaginarni 13
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 18-Jun-2008
• Due Date: 23-Aug-2008
• Completion Date: 14-Jul-2008
• Ref Project: EN 4170:2007 - Aerospace series - Paints and varnishes - Test method for measurement of resistance to cold crack temperature cycle

Overview

EN 4170:2007 (CEN) - "Aerospace series - Paints and varnishes - Test method for measurement of resistance to cold crack temperature cycle" specifies an ageing/thermal cycling procedure to assess the resistance of aerospace coatings on metallic or organic substrates. The standard defines a controlled cold/hot/hot-and-wet temperature cycle to induce periodic fatigue in the paint or at interfaces and to evaluate whether cracking, loss of adhesion, blistering or other defects occur.

Key topics and technical requirements

• Scope: Assess capability of paint systems to tolerate internal stress changes without cracking, peeling or loss of functionality.
• Apparatus: A climatic chamber able to reproduce the specified temperature and humidity cycle with required accuracy.
• Specimen preparation: Panels selected and prepared per the applicable material specification; paint applied per manufacturer’s instructions (viscosity, overcoating time, drying).
• Thermal cycle (summary of the standard’s sequence):
  • 18 h at (50 ± 1) °C and (90 ± 10) % RH
  • Cool to −55 °C (rates and ramps per standard figure; ramp segments include slow ramps ~2–3 °C/min and rapid ramps at 10 °C/min)
  • Hold 2 h at −55 ± 1 °C
  • Heat to 80 ± 1 °C at 10 °C/min, hold 2 h
  • Cool again to −55 ± 1 °C, hold 2 h
  • Return to 50 ± 1 °C / 90 ± 10 % RH at ~2–3 °C/min
• Duration: Unless otherwise specified, the test is defined by 30 cycles.
• Acceptance criteria and reporting: Evaluation procedures and pass/fail requirements are defined by the applicable material specification. Test report shall include designation, cycle details, paint system, batch numbers, application and drying conditions, film thickness, gloss, colour and defects.

Applications and users

• Quality assurance and durability testing for aerospace paints and coatings
• Material qualification during aerospace component development and procurement
• Paint formulators validating resistance to thermal fatigue and humidity exposure
• Certification and compliance testing laboratories and OEM suppliers
• Materials and coatings engineers assessing adhesion, flexibility and cohesive strength under extreme thermal cycling

Keywords: EN 4170, cold crack temperature cycle, thermal cycling test, aerospace paints, coating durability, climatic chamber, paint testing, coatings resistance.

Related standards

• ISO 1513 - Preparation and examination of paint samples
• ISO 3696 - Water for analytical laboratory use

Use EN 4170 as the reference protocol when specifying thermal cycling durability requirements in aerospace material specifications and test plans.

Standards Content (Sample)

SLOVENSKI STANDARD
01-september-2008
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FLNOLþQHPL]SRVWDYOMDQMXQL]NLWHPSHUDWXUL
Aerospace series - Paints and varnishes - Test method for measurement of resistance to
cold crack temperature cycle
Luft- und Raumfahrt - Anstrichstoffe - Beständigkeit gegen thermische Kreisläufe
Série aérospatiale - Peintures et vernis - Méthode de test pour mesurer la résistance aux
cycles de basse température
Ta slovenski standard je istoveten z: EN 4170:2007
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
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN 4170
NORME EUROPÉENNE
EUROPÄISCHE NORM
July 2007
ICS 49.040
English Version
Aerospace series - Paints and varnishes - Test method for
measurement of resistance to cold crack temperature cycle
Série aérospatiale - Peintures et vernis - Méthode de test Luft- und Raumfahrt - Anstrichstoffe - Beständigkeit gegen
pour mesurer la résistance aux cycles de basse thermische Kreisläufe
température
This European Standard was approved by CEN on 13 April 2007.
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 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 Management Centre has the same status as the
official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,
France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,
Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36  B-1050 Brussels
© 2007 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 4170:2007: E
worldwide for CEN national Members.

Contents Page
Foreword.3
1 Scope.4
2 Principle.4
3 Apparatus.4
4 Specimen.4
5 Procedure.4
5.1 General.4
5.2 Cold crack cycle.5
6 Results.6
7 Designation.6
8 Test report.6
Bibliography .7

Foreword
This document (EN 4170:2007) 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
...