Positive Material Identification (PMI) is the analysis of materials to determine the elemental composition of a metal or alloy. Knowing the exact composition or grade of an alloy will help suppliers, plant workers and other related industries to check alloys that will match to their specific purposes and requirements such as durability, heat resistance, corrosion resistance, etc. For places like petroleum refineries & chemical plants, having the right alloy is essential for safe and efficient operations.