Ningbo Dongyu Nonwoven Co., Ltd.

(1) Standard source
This standard is China's mandatory national standard, proposed by the State Administration of Production Supervision, by the National Technical Committee for the Standardization of Personal Protective Equipment (SAC/TC 112).

(2) Technical content
From the scope of application, this standard is applicable to the general protection of all types of particulate matter self-absorbing filtered respiratory protection supplies, typical such as masks, other special environments (such as oxygen-deprived environment, underwater operations, etc.) are not applicable
From the definition of particulate matter, this standard defines the various forms of particulate matter, including dust, smoke, fog and microorganisms, but does not define the size of particulate matter.
From the filtration element level, it can be divided into KP class of filter non-oil particulate matter and filtered oily and non-oily particulate matter, and is marked as similar to the N, R/P as stipulated in the interpretation guide of CFR 42-84-1995.