At Cutech, we deliver trusted Positive Material Identification (PMI) services across safety-critical sectors to verify alloy grade composition, and compliance. Our experienced technicians use fast, accurate and non-destructive techniques to ensure materials meet strict standards across manufacturing, construction, and energy projects.
What is Positive Material Identification (PMI)?
PMI Explained: Verifying Metal Composition Onsite
Positive Material Identification (PMI) is a non-destructive testing method used to verify the chemical composition of metal alloys.
At Cutech, we provide PMI positive material identification onsite. We use handheld and mobile analysers to reduce the risk of material mix-ups and non-compliance. This is crucial where incorrect alloy use could result in serious operational failures or safety issues.
Benefits of PMI in Quality Control & Asset Management
PMI testing enables organisations to comply with project specifications and improve asset traceability.
Some of the numerous benefits, include:
- Early detection of alloy mismatches
- Compliance with regulatory and client specifications
- Improved record keeping for QA/QC documentation
- Support during shutdown and plant maintenance
Positive Material Identification testing forms a vital part of quality assurance and process safety in sectors such as oil and gas, marine, petrochemical, and fabrication.
When is PMI Testing Required?
PMI is typically required when materials are sourced from multiple suppliers, no certification is available for components, weld overlays, valves or pressure containing parts must meet material codes and when inspection is part of shutdown or plant maintenance procedures.
In these cases, testing is often carried out in line with the positive material identification standard ASTM. This standard provides guidance on ensuring alloy composition matches design and safety specifications.
Positive Material Identification (PMI) Testing Methods and Techniques
X-Ray Diffraction (XRD) for Crystal Structure Analysis
At Cutech, we use x-ray diffraction XRD to analyse crystal structure and phase identification in complex alloys. This inspection method provides high-precision results, especially in identifying heat treatments or differentiating between similar alloys.
X-ray diffraction XRD is also ideal for failure investigations and metallurgical analyse in regulated sectors.
Optical Emission Spectroscopy (OES) for Elemental Analysis
We use Optical Emission Spectroscopy (OES) to verify the content grade of metal components. This is a fast and reliable method used to confirm the makeup of materials. This type of positive material identification test is crucial when working with stainless steel, nickel alloys and other complex metals and ensures materials meet compliance standards.
Ferrite Testing (FT) in Austenitic and Duplex Stainless Steels
Our experienced technicians use Ferrite Testing (FT) to measure ferrite levels in stainless steels and is especially crucial where strength and corrosion resistance are critical. This includes stainless types commonly used in pressure vessels, pipelines and offshore structures.
At Cutech, our portable equipment allows for accurate ferrite checks onsite, supporting quality control and compliance in demanding environments.
Positive Material Identification Standards
Positive Material Identification Standard ASTM Explained
At Cutech, we follow strict Positive Material Identification ASTM guidelines which provide guidance on procedures for verifying the composition of metal alloys.
The standard sets out recommended practices for choosing test methods, equipment and documentation to ensure reliable identification, with consistent and traceable results across different industries.
Compliance with API, ASME, and ISO Material Standards
In addition to ASTM E1476, we also apply other PMI related standards depending on the industry and application. This includes ASTM E1086, ASTM E415 and API578 in relation to oil and gas systems.
Where appropriate we also follow ASME material specifications and ISO 17025 for lab competence and quality control.
At Cutech, our technicians use these recognised frameworks to deliver compliant inspection services.
Industry Applications of PMI
Petrochemical and Oil & Gas
Our team regularly undertake work in refineries and chemical plants, where positive material identification ensures materials used in pipework, pressure vessels and structural supports meet the correct alloy specifications to help prevent costly shutdowns.
Power Plants and Refineries
At Cutech, we carry out PMI positive material identification in power generation and refinery projects to support material verification during fabrication, commissioning, and maintenance stages.
Our inspections ensure compliance with strict safety and operational requirements.
Aerospace, Marine, and Manufacturing
In aerospace, marine, and manufacturing, where material performance is tightly regulated and deviations could impact safety or product lifespan, PMI is crucial.
We work closely with OEMs, contractors, and component manufacturers to ensure that all materials meet specification, traceability requirements, and relevant regulatory standards.
Why Choose Cutech for PMI Testing?
Certified Technicians and Mobile Onsite Equipment: At Cutech, all our inspectors are certified in positive material identification methods and are trained in international QA/QC protocols. We operate mobile analysers for fast on-site PMI with minimal disruption.
Fast, Accurate, and Non-Destructive Analysis: We use non-destructive PMI techniques including x ray diffraction XRD, Optical Emission Spectroscopy (OES) and Ferriter Testing (FT) to ensure reliable, same-day results with detailed reporting.
Integration with QA/QC and Shutdown Programs: Our PMI positive material identification services can be integrated into wider quality assurance and shutdown programmes to provide traceability, documentation and real-time decision-making across fabrication yards and operational facilities.
Positive Material Identification FAQs
What is Positive Material Identification (PMI)?
Positive material identification is a non-destructive testing method (NDT) used to verify alloy composition of metals, ensuring materials match design or specification requirements.
What techniques are used in PMI Positive Material Identification?
At Cutech, common PMI testing techniques include x ray diffraction XRD, Optical Emission Spectroscopy (OES) and Ferrite Testing (FT). We select the technique based on the material type, accuracy required and compliance needs.
What is the ASTM standard for positive material identification?
The main positive material identification standard ASTM is ASTM E1476. This standard outlines the testing requirements and procedures to enable verification of metallic composition in safety-critical environments, such as oil and gas, marine and aerospace.