This European Standard describes two types of reference blocks: - Type 1 reference blocks are used to determine the sensitivity levels of both fluorescent and colour contrast penetrant product families; - Type 2 reference blocks are used for routine assessment of the performance of both fluorescent and colour contrast penetrant facilities and part-used containers.
DS/EN ISO 3452-3:1999 history
1999DS/EN ISO 3452-3:1999 Non-destructive testing - Penetrant testing - Part 3: Reference test blocks