... >40min,Type 60>60min poison gas and smoke protecting,fireproof,hot-radiation protecting ... ,sealing Description This kind of respirat is an essential personal poison-gas ... >40min,Type 60>60min poison gas and smoke protecting,fireproof,hot-radiation protecting, ... Cabon monoxide(CO),hydrocyanic anid(HCN),poison smoke and fog. 3. Mist permeability coefficient ...