Firefighters wear fireproof and chemical protective clothing when entering the scene of chemical hazardous or corrosive material fires, as well as toxic and harmful gases or accident sites, to search for fire sources or accident points, rescue personnel in distress, and carry out firefighting and rescue operations. Mainly used for whole-body protection during the disposal of biochemical toxic gases in chemical disaster accidents or biochemical terrorist attacks, and can defend against highly toxic hazardous chemicals such as mustard gas, sarin, Lewis agents, nerve agents, strong acids, strong bases, industrial benzene, and inorganic chemicals.