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Paints and varnishes. Cupping test
This International 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 (see 7.1).
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.
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