Positive Material Identification (PMI) is the identification and chemical analysis of various metal alloys through nondestructive methods. PMI can help you to make purchase and processing decisions in a cost-effective, non-destructive manner. Additionally, PMI can confirm the legitimacy of materials customers have purchased. There are a few situations that might call for PMI service. For example, if a sample cannot be cut for routine testing or if part of an assembly is too large for shipping, Penn Stainless can perform a PMI test to gather information about the product.