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DIN EN ISO 1520:2007
Paints and varnishes - Cupping test (ISO 1520:2006); German version EN ISO 1520:2006
The standard specifies an empirical test procedure 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.
Deutsches Institut für Normung [din]