... Time:5days Shanghai Haolin Industrial Co., Ltd. Respirator With Steel Cylinder,Chemical respirator,Security with 100% Silicone mask Item standard1. 300Bar / 4500psi2 ... , laboratory, mine, and can be worn by fire fighter or lifesaver for the firefighting, rescue, lifesaving, safety and effectively ... are dense smoke and pollution of poison gas, smog or steam.B. Atmospheric environment of -30°C~+60°C ...