（五）耐候性强：该产品选用分子量大、化学稳定 性强的高分子量材料做原料，通过科学的配方、先的工艺、完善的技术设备使该产品能在— 40℃ — 90℃ 正常使用。
Stainless Steel manhole cover product features: (1) high strength: using polymer synthetic materials, with reinforced skeleton, through high temperature molding, the highest test results of more than 40 tons, meet and exceed the latest CJ / T211-2005 standards issued by the Ministry of Construction of the People's Republic of China. (2) beautiful appearance: The surface pattern design of FRP manhole covers is exquisite, and can be made into various patterns and colors to beautify the urban environment. (3) light weight: The weight of the product is only about one third of that of cast iron, which is convenient for transportation, installation and repair, and greatly reduces the Labor intensity. (4) anti-theft: The synthetic material has no recycling value and is naturally anti-theft, and is provided with a locking structure to realize the theft-proof property in the well. Can completely put an end to the "urban black hole" accident. The product is made of high molecular weight material with high molecular weight, chemical stability and strong weatherability. Through scientific formula, advanced technology and perfect technical equipment, the product can be used in Foshan at 40 °C to 90 °C. (6) high precision: Because the product is molded by high temperature mould, the gap of cover seat is small, which overcomes the problems of "running, jumping and ringing" of cast iron and cement covers, and improves the road capacity and Driving Comfort. (7) corrosion resistance: The product tested by the national chemical building materials testing center has obvious acid and Alkali resistance, corrosion resistance, anti-aging index reached three or more, longer service life.