PMI material testing, or Positive Material Identification testing, is a non-destructive analytical method used to verify the elemental composition of natural stone and ensure it matches specifications for a project. In the stone industry, PMI testing employs handheld X-ray fluorescence (XRF) analyzers to identify and quantify the elements present in stone materials within seconds, confirming their authenticity, detecting potential contaminants, and validating consistency across large shipments. This testing has become a crucial quality assurance tool for high-stakes projects where material integrity directly impacts durability, aesthetic …
