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M
Marking Permanency Test

MPT

 External visual inspection may reveal evidence of remarking where the original marking was removed by chemical or mechanical means, and the marking area was resurfaced or masked with a material that may or may not match the original surface. Any removal of the original surface finish, laser markings, or ink markings is an indication the part may be fraudulent or counterfeit. This first test focuses on ink part markings and is a modified resistance-to-solvents test. To perform this test, mix a solution of three (3) parts mineral spirits (CAS Registry Number 9072-35-9) with one (1) part isopropyl alcohol (CAS Registry Number: 67-63-0). Dip a cotton swab into the solution, and wipe the swab across the markings on the part. The markings should not smear or be removed by the solution. However, more agressive test methods that will also test for resurfacing reveal other indications that the original device marking has been removed.
Source: SAE Aerospace Standard AS6081 Fraudulent/Counterfeit Electronic Parts: Avoidance, Detection, Mitigation, and Disposition – Distributors