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In Equal-pressure method gas permeability test standard ASTM D3985, it is specified that calibrations should use referential material provided by NIST. However, many standard executors do not fully understand the material of such referential medium and the method to obtain its standard value. This article presents a detailed introduction to the traceability of referential material as well as the referential material adopted in ASTM equal-pressure method gas permeability test standards. It also analyzes the position of each test method in gas permeability test field.
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