KN90 mask introduction
KN90 masks are the standard for respiratory protective equipment GB2626-2006 promulgated by the National Quality Supervision, Inspection and Quarantine Bureau and the National Standardization Management Committee. Units producing dust masks must obtain a production and operation license in accordance with the law. The production technical specifications of all dust masks must comply with the corresponding standard. This standard specifies the production and technical specifications of respiratory protective equipment, and has strict requirements on the material, structure, appearance, performance, filtration efficiency (dust blocking rate), breathing resistance, detection methods, product identification, packaging, etc. of dust masks. The material of the dust mask must be non-irritating and non-allergenic to the skin, and the filter material is not harmful to the human body. The structure of the dust mask should be easy to use. The filtering efficiency (dust-blocking rate) of the dust mask, the particle diameter is less than 5 microns. The dust rate must be greater than 90%, and the dust resistance rate of particle diameters less than 2 microns must be greater than 70%.
Classified by performance
Classification by protection level
KN90: The filtration efficiency for non-oily particles above 0.075 microns is greater than 90%
KP90: For oily particles above 0.185 microns, the filtration efficiency is greater than 90%
Filter material requirements
3. The materials used should have sufficient strength and should not be damaged or deformed during normal service life.
5. Respiratory protective equipment using replaceable filter elements, exhalation valves, inhalation valves and headbands should be designed for easy replacement and allow users to check the airtightness of the mask and face at any time and conveniently;
Mainly applicable to industries with oily and non-oily pollutants such as dust, smoke, fog and other particles above 0.185 microns produced by non-ferrous metal processing, metallurgy, steel, coking, gas, organic chemicals, food processing, construction, decoration, petrochemical and asphalt .