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See Chinese contents: GB 2626-2019 GB 2626-2019: [N95/KN95 face mask] Respiratory protection -- Non-powered air-purifying particle respirator
This standard specifies the classification and marking, technical requirements, testing methods, identification of non-powered air-purifying particle respirator. This standard applies to non-powered air-purifying respirator that protects against particle. This standard does not apply to respirators that protect against harmful gases and vapors. It does not apply to the respirators for hypoxic environments, underwater operations, escape, fire-fighting.
