... of unsaturated polyester resin, low shrinkage and fiber glass. Polyester box,made of unsaturated polyester resin, low shrinkage and fiber glass ... ,400x300x200mm,500x400x200mm,600x400x230mm,600x500x230mm and 800x600x300mm.The protection degree is IP66. polyester enclosure/IP66/TIBOX CHINA/SMC box-frp smc enclosure