... , Ministry of Public Security standard GA209-1999, poison gas and smoke protecting, fireproof, hot-radiation protecting, good sealing property ... protection: Carbon monoxide (CO),hydrocyanic acid(HCN), poison smoke and fog. 3.Mist permeability coefficient<5%,d. Inhalation resistance ... cant be used for work Protection, just for personal escape and self-life-saving. 2.Storage conditions: 0- 40 surrounding, ...