1 Scope
This standard specifies an empirical method for assessing the resistance of a coating of paint, varnish or related product to cracking and/or detachment from a metal substrate when subjected to gradual deformation by indentation under standard conditions.
This standard is applicable to single-coat or multi-coat system. For a multi-coat system, each coat may be tested separately or the complete system may be tested.
The method may be carried out as follows:
— either as a “pass/fail” test, by testing to a specified depth of indentation to assess compliance with a particular requirement;
— or by gradually increasing the depth of indentation to determine the minimum depth at which the coating cracks and/or becomes detached from the substrate.
2 Normative References
The following normative document contains provisions which, through reference in this text, constitute provisions of this standard. For dated references, subsequent amendments to, or revisions of, any of these publications do not apply. However, parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent edition of the normative document indicated below. For undated references, the latest edition of the normative document referred to applies.
GB/T 3186-2006 Paints, Varnishes and Raw Materials for Paints and Varnishes — Sampling (ISO 15528:2000, IDT)
GB/T 9271 Paints and Varnishes — Standard Panels for Testing (GB/T 9271-1988, eqv ISO 1514:1984)
GB/T 13452.2 Paints and Varnishes — Determination of Film Thickness (GB/T 13452.2-1992, eqv ISO 2808:1974)
GB/T 20777-2006 Paints and Varnishes — Examination and Preparation of Samples for Testing (ISO 1513:1992, IDT)
3 Principle
Foreword II
1 Scope
2 Normative References
3 Principle
4 Apparatus
5 Sampling
6 Test Panels
7 Procedure
8 Supplementary Test Conditions
9 Expression of Results
10 Precision
11 Test Report
Bibliography
