The frame developed by our company is made from new-style compound SMC (flake mold plastic reinforced with plate unsaturated polyester glass fiber), which is formed after high-pressure molding. It is with smooth surface, well-distributed and handsome outline, and logical structure. Features: 1) It is made from new-style compound SMC, the frame is attributed with excellent performance of anti-erosion and anti-aging 2) Its life is more than 30 years 3) The frame with inner and outside convection passage has function of against vapor coagulation 4) The rabbet-joint structure and auxiliary air-proof parts are applied on the board of the box door, so the frame is with good airproof performance to defend against rain, dust and worm 5) The security level reaches the requirements of GB4208-IP65 class 6) The security is guaranteed by the measures of three-point orientation lock on the frame and door, it is safe and reliable 7) The parts are rational in size, inside space is commodious Specifications: 1) Grade for defense: GB4208-IP65 2) Flame resistance: FVO level 3) Insulation resistance: 2 x 104MΩ 500V (DC) 4) Environmental temperature: -40°C + 60°C 5) Burden value: exterior: >980N; gemel: >200N 6) Relative humidity: