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At Dunlop NDT, our engineers and technicians use the latest technology in Optical Emission Spectroscopy (OES) to obtain elemental information on samples submitted for testing. The information is used to compare materials to known standards or codes. The materials can be verified to meet specific requirements or listed as compliant or noncompliant with customer applications by the specific minimum and/or maximum quantities of an element in the materials.


Chemical Analysis can be an integral part of material selection or design for most projects. The materials actual composition is required for many applications. Within our lab, we test many metals to include carbon steel, stainless steels, cobalt steel, tool steel, irons, nickel alloys, aluminum alloys, and copper alloys by OES.


Chemical Analysis by OES is performed by sparking a material and comparing the intensity of the emitted light at a given wavelength. The wavelengths emitted are measured against a known standard and the elemental quantities can be determined in the material. The information is generated in a report format and compiled for comparison.


DNDT can perform OES on many different metals including:

  • Aluminum Alloys

  • Carbon Steel

  • Cast Iron

  • Cobalt Alloys

  • Chromium Alloys

  • Copper Alloys

  • Nickel Alloys

  • Stainless Steel

  • Tool Steel


We offer OES testing compliant with many different industry standards and codes to include:

OES Testing Standards:

  • API – American Petroleum Institute

  • ASME – American Society of Mechanical Engineers

  • ASTM – American Society for Testing and Materials

  • AWS – American Welding Society

  • Client Specified Standards

OES Testing Codes:

  • 1104 (Welding of Pipelines and Related Facilities)

  • BPVC Section II (materials)

  • Customized Test Services

  • D1.1, D1.2, D1.5, D1.6

  • E412, E1086, A751

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