This part of IEC 60068 specifies tests for the whiskering propensity of surface finishes of electric or electronic components and mechanical parts like e.g. punched/stamped parts (as, for example, jumpers, electrostatic discharge protection shields, mechanical fixations, press- fit pins and other mechanical parts used in electronic assemblie) representing the finished stage, with tin or tin-alloy finish (changes of physical dimensions of mold compound, plastic etc. during required test flow will not be considered or assessed). The test methods have been developed by using a knowledge-based approach. This standard can also be used at sub-suppliers like plating shops, stamping shops or other service providers to assure a consistent surface quality within the supply chain. This test method is employed by a relevant specification (component or application specification) for components covered therein with defined acceptance criteria. The tests described in this standard are applicable for initial qualification, monitoring according to clause 7 and changes of technology or manufacturing processes on existing surfaces according to clause 9 . The mating area of connectors is not covered by this test method.IEC 60512-16-21 applies to the mating areas of connectors.