... to oil fields, oil refineries, offshore oil platform, power plants, gas stations, oil tanks, wharf, tunnel, pumping station, substation, the ... , Zone 20, Zone 21, Zone 22 and Ⅱ A, Ⅱ B, Ⅱ C explosive gas atmosphere.Features1.Patented design for heat dissipation to ensure ... anti-corrosion coating,high explosion-proof degree of flameproof type; dust-proof, waterproof; lens made of bulletproof PC which is ...