Composite manhole covers are mainly made of unsaturated polyurethane resin and formed using compression molding technology. They are a new type of green, environmentally friendly, and low-cost manhole cover. Composite manhole covers are formed by one-time pressing using ultra-high pressure and high temperature, thus they have high strength, high density, high tensile strength, and excellent impact resistance. At the same time, composite manhole covers also have advantages such as wear resistance, corrosion resistance, environmental friendliness, and no maintenance required. Composite manhole covers use mesh steel bars to enhance internal strength, which can quickly disperse the pressure generated by people and vehicles, ensuring people’s own safety and financial security. Due to the fact that the metal used in composite manhole covers does not exceed one tenth of their own weight, and the composite manhole covers have high strength, they do not have much theft value.

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1. Due to the fact that the raw materials used for composite manhole covers meet China’s green and environmental protection requirements, and have the advantages of high quality, low price, light weight, anti-theft, and reduced urban noise.
2. Due to the use of unsaturated polyurethane resin as the main raw material for composite manhole covers, they have the advantages of acid resistance, alkali resistance, salt corrosion resistance, and non rusting. They can also be applied in harsh environments such as high or low temperatures.
3. The composite manhole cover has strong plasticity, strong coloring ability, and rich color changes. The application of overall raw material coloring technology results in long-lasting color, smooth surface, smooth and delicate hand feel of the product.
4. Due to the use of composite materials for forming composite manhole covers, excluding metal, it has far more anti-theft advantages than traditional manhole covers.