Assay Technology, Inc. - Respirator Cartridge, Canister, and Escape Mask Testing

In 2004, Assay Technology announced it had concluded an agreement with Miller-Nelson Research, Inc. (MNR), of Monterey, California, to acquire MNR's Respirator Cartridge and Canister Test Facility. This acquisition positioned Assay Technology to assume Miller-Nelson's long-held position as the leading independent laboratory for evaluation of cartridges and canisters used in air-purifying respirators.

Under the terms of the agreement, MNR's Cartridge and Canister Life Test Facility was installed as a unit of Assay's AT Labs facility in Livermore, California. To ensure and maintain the ongoing quality of services, Gary Nelson, President and Founder of MNR, entered into a long-term agreement to collaborate with Assay Technology as consultant and advisor in respirator evaluation. 

Miller-Nelson Research Inc. had been testing air purifying respirators since 1972 and has performed over 17,000 individual tests using over 450 different materials. Currently we perform all the NIOSH and European gas and vapor respirator qualification tests for the vast majority of respirator manufacturers, as well as their suppliers of sorbents. We also have provided service life information to over 500 end users.

Gases Tested:

  • Acrolein

  • Ammonia

  • Carbon Monoxide

  • Carbon Tetrachloride

  • Chlorine

  • Chlorine Dioxide

  • Chloroacetophenone (Tear Gas, CN)

  • Chlorobenzylidin Malononitrile (Tear Gas, CS)

  • Cyanogen Chloride

  • Cyclohexane

  • Formaldehyde

  • Hydrogen Chloride

  • Hydrogen Cyanide

  • Hydrogen Fluoride

  • Hydrogen Sulfide

  • Mercury

  • Methyl Amine

  • Nitrogen Dioxide

  • Phosgene

  • Phosphine

Please Contact Us for a Quote:

800-833-1258 or



Lab Request Forms:

Assay Technology, Inc. - Miller-Nelson

Test Atmosphere Generators

Interested in Glove & Protective Clothing Testing or Permeation Testing?  Assay Technology does not perform this testing.  But we can refer you to a company that does. 

Visit MNA Permeations at:

Gas Mixtures: Preparation & Control

by Gary O. Nelson