Testing PROCESSES
Positive Material Identification (PMI)
Positive Material Identification (PMI) is a non-destructive testing method used to verify the chemical composition of metals and alloys. PMI ensures that the material matches the specified grade or specification, preventing the use of incorrect or substandard materials in critical applications. This verification is essential for engineered fasteners, where material properties directly affect strength, corrosion resistance, and performance.
How the Test is Performed
Sample Preparation – The surface of the fastener or component is cleaned to remove coatings, oils, or debris.
Analysis – A handheld or stationary X-ray fluorescence (XRF) or optical emission spectrometer (OES) device is used to analyze the elemental composition of the metal.
Comparison to Specifications – The measured chemical composition is compared to the required material standard or grade.
Documentation – Results are recorded, providing traceable verification of material compliance.
Why It is Performed
PMI is performed to prevent material mix-ups, ensure compliance with specifications, and guarantee performance and safety. Using the wrong material in a fastener could lead to reduced strength, corrosion failure, or catastrophic component failure in service.
Confirms alloy and material grade accuracy
Prevents use of incorrect or counterfeit materials
Supports regulatory and customer requirements
Ensures reliability and safety in critical applications
Application to Engineered Fasteners
Engineered fasteners must often meet strict material requirements to perform in high-stress, high-temperature, or corrosive environments. PMI ensures that:
Fasteners are made from the correct alloys to meet mechanical and corrosion resistance requirements
Material traceability is documented for quality assurance and regulatory compliance
Performance is reliable in aerospace, oil & gas, nuclear, defense, and other critical industries
Customer specifications are verified prior to assembly or delivery
Standards & Compliance
WN Global performs PMI in accordance with ASTM, ASME, ISO, and customer-specific standards. All equipment is calibrated regularly, and testing is conducted by trained professionals to ensure accurate, repeatable, and traceable results. This adherence to recognized standards demonstrates WN Global’s commitment to quality, safety, and delivering engineered fasteners and machined components that meet exacting specifications.
Testing Processes
DOING WHATEVER IT TAKES
Putting Manufacturing Exellence Into Practice
The manufacturing processes, testing capabilities, and quality systems featured throughout WN Global support the production of critical components and engineered fastening solutions across demanding industries. Connect with our team to learn how our manufacturing capabilities can support your project requirements.
