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The difference of different materials of manhole cover

The difference of different materials of manhole cover

  • 2017/07/07

1、Appearance :

Composite Manhole Covers are smooth and beautiful in appearance , can be colored and designed according to design requirements ;

Cast Iron Manhole Covers are easy to rust and corrosion ,poor appearance ;

Concrete Manhole Covers are not smooth in the surface , more difficult to be colored .


2、Weight : Composite Manhole Cover’s weight is light , about one-third of cast iron and concrete similar products;  


3、Toughness : Composite Manhole Covers have good toughness , not easy to crack ;

                             Cast Iron Manhole Covers have good rigidity , lack of toughness , easy to crack ;

                             Concrete Manhole Covers good solid, lack of toughness and rigidity, easy to crack;


4、Vehicle driving situation :

 Composite Manhole Covers are close between cover and frame ,balanced without warp, bounce and so on ;

 Cast Iron Manhole Covers are not close between cover and frame , easy bounce when over the vehicle,it is noisy ;

 Concrete Manhole Covers are not close between cover and frame , easy bounce when over the vehicle , easy to damage .


5、Maintenance :

Composite Manhole Covers are easy to be recognized and daily maintenance , because of its feature , like anti corrosion , light weight , easy to be colored , good sealing and so on ,effectively reduced the cost of labor of maintenance and update ;

Cast Iron Manhole Covers are increased the difficulty of maintenance and costs of update , because of its heavy weight , easy rust and corrosion ;

Concrete Manhole Covers are heavier , increase the difficulty of maintenance .


6、Unit cost : The unit cost of composite manhole covers is 40% lower than cast iron manhole cover , 20% higher than concrete manhole cover .


SMC Fiberglass covers are smooth and beautiful in appearance, can be colored and designed according to design requirements; light weight, about one-third of cast iron and concrete similar products; SMC covers with good toughness, not easy to crack;no recycle value,anti-theft, good sealing ,over the vehicle without bouncing phenomenon, no noise;anti-corrosion,can be used in harbor city.


Cast iron manhole covers are more heavy,easy to rust and corrosion,poor appearance,sealing is not good,easy bounce when over the vehicle,it is noisy,easy to be stolen.


Concrete manhole cover is heavy,the surface is not smooth,more difficult to be colored,good solid, but lack of toughness and rigidity, easy to crack;sealing is not good,easy bounce when over the vehicle,easy to damage.


Hand making manhole cover’s loading class and material is not as good as SMC;because production process affected by the weather,the production efficiency is low,due to hand making process,the quality is unstable.

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