Composite resin manhole cover
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Composite resin manhole cover

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The composite manhole cover is made of fiber-reinforced thermosetting composite material with unsaturated polyester resin as the matrix, also known as bulk molding compound (DMC). ²2. The composite manhole cover adopts high temperature and high pressure one-step molding technology, which has high polymerization degree, high density, good impact resistance and tensile strength, and has the advantages of wear resistance, corrosion resistance, no rust, no pollution, and no maintenance.

The interior of the composite manhole cover is reinforced with reticulated steel bars, and the key parts of the force are specially reinforced. In the event of an unavoidable external force impact, the pressure can be quickly dispersed to ensure the safety of people and vehicles.  The composite manhole cover does not contain metal, and the reinforced skeleton of the stone-plastic manhole cover and the concrete manhole cover is less than 1/10 of the total weight of the manhole cover. Not much stealing value. And because the strength of the manhole cover is extremely high, it is extremely difficult to remove this little steel bar from the manhole cover. So, thieves don't steal.


1. The inorganic magnesite composite manhole cover has high strength, low price and beautiful appearance. This product can be arbitrarily colored, easy to install, maintain, and identify. Because it has no recycling value, it completely solves the problem of anti-theft. Our country will gradually switch to composite manhole covers in the next three to five years, and the market potential is huge. 

2. Inorganic synthetic composite manhole cover. This manhole cover is made of new high-strength inorganic synthetic material, glass fiber and steel skeleton. It is a mid-range manhole cover product. 

[1] Its strength is second only to that of stone plastic manhole covers. It can carry more than 40 tons of vehicles. [2] Its comprehensive performance is between the stone-plastic manhole cover and the concrete manhole cover, which is better than that of concrete; it can be used in occasions with high technical requirements for manhole covers. 

[3] Its most prominent advantage is that it can be reinforced with glass fiber instead of steel skeleton, which belongs to GRC type product. Therefore, it has the advantage of being unaffected under the current situation of rising steel prices. Because it does not contain a little iron, it is more anti-theft than stone plastic and fiber concrete manhole covers.

[4] Its curing speed is several times faster than that of fiber concrete, and it can be demolded in 8 hours. If it is produced in three shifts, it can be demolded three times in 24 hours. Although the amount of mold is more than that of stone plastic, it is only 1/6 of that of fiber concrete manhole covers. It can also reduce mold investment. With an annual output of 10,000 sets of manhole covers, only 10 sets of molds are required.


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