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Part Permanency

Part Permanency / Resistance to Solvents A marking permanency test is performed by swabbing one part by volume of isopropyl alcohol, three parts by volume of mineral spirits per Mil-Std-883 test method 2015 or JESD-B107C. 

Acetone can be used to check for resurfacing and coatings on the parts. Scratch test is also used on the component surface with a scribe or blade to detect coating that is not detectable with acetone testing.