Airgas EPA Protocol Standards are manufactured according to the U. S. Environmental Protection Agency Document: EPA Traceability Protocol for Assay and Certification of Gaseous Calibration Standards (October 1997). EPA Protocol Standards are directly traceable to the National Institute of Standards and Technology (NIST) via the use of NIST Standard Reference Materials (SRMs) or equivalents, such as NIST Technical Reference Materials (NTRMs) as reference gases in the manufacturing process. Stability is guaranteed for the full period allowed by the Protocol and Certificates of Analysis are provided in strict accordance with Protocol guidelines.

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