Plastic manhole cover

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Advantages: Manhole covers affect a lot of people's lives in the city. For example, on rainy days, manhole covers can be used to drain water. Some sewage can be passed through manhole covers without emitting odor, which will not harm human beings and will not affect the environment. Disadvantages: cement manhole cover contains steel fiber which is very strong rigidity, brittleness is very big, not acid and alkali corrosion resistance, easy aging and fracture, poor bearing capacity, resulting in another form of manhole cover loss, so there are a lot of cement manhole covers in the market has been off the shelf. Nodular cast iron manhole cover: the bearing capacity of this manhole cover is not easy to aging and fracture, but its price is greatly improved, although it has recycling value but easy to steal.