Makrite G510 Series Non-Powered Air-Purifying Half Facepiece Respirator with MK9017 Chlorine/Hydrogen Chloride/Sulfur Dioxide (CL/HC/SD) chemical cartridge has been approved by the National Institute for Occupational Safety and Health (NIOSH), which can provide respiratory protection against certain airborne contaminants according to the use restrictions of OSHA federal regulations or GB/T 18664-2002 and other applicable regulations. It is in accordance with GB2626-2019 non-powered air-purifying particulate respirator and GB2890-2009 non-powered air-purifying respirator and other related laws and regulations.