1,CQST Certified,Zone 1,2. 2,IP65. 3,The aluminium alloy of special high strength. 4. ... obtained the explosion-proof certificate.·Standard--- GB3836.2-2000 Electrical apparatus for explosive gas atmospheresPart 2:Flameproof enclosure "d" epv IEC60079-1:1900 ... Hazardous Areas is applying scope hazardous gas areas: Zone 1&2 ; Explosive gas or vapor atmospheres:class IIA,IIB,IIC, temperature ...