Positive Material Identification (PMI) Testing Services

Positive material identification (PMI) is an essential non-destructive testing (NDT) method utilized to verify that supplied materials conform to the proper standards and specifications. As a result, assurance can be gained that the chemical makeup of the metallic parts has the correct percentage of key elements.

TÜV Rheinland offers PMI testing services through experienced, trained personnel who can assure quality of service. The material scan and testing services can be performed on-site before the pieces go into the production process. PMI can be utilized on a variety of part sizes – from large complex parts to things as small as the weld fill material on the pieces.

With PMI testing services from TÜV Rheinland, you can be sure of:

• Highly specific and accurate results, essential to good quality control.
• Assurance for verification of specialty metal parts.
• Field testing with laboratory quality.
• Quick results for product verification and sorting of product that may have been inadvertently mixed.
• A lead against the competition with a neutral audit seal.
• Reduced risk of company liability with documented safety standards.
• Fast audit times and our long-standing experience.
• Exclusive, one-stop shop service of TÜV Rheinland
• Compliance with local government and legal requirements

Positive material identification (PMI) is performed using a handheld device. We have two methods at our disposal: X-ray fluorescence analysis (XRF) and optical emission spectrometry (OES). The XRF method determines the composition of the material using element-specific scattered radiation (X-rays). The OES method determines the composition of the material using the light spectrum emitted when surface material is evaporated using an electric arc. Both methods reliably determine the percentage composition of the elements in the compound.

Note: Due to procedural reasons, the XRF method cannot determine the carbon content.