Manhole Covers 2019-02-17T00:23:14+08:00



Our FRP manhole covers have the following properties:

  • Our FRP manhole covers are made from composite materials such as glass fibre, resin, quartz and corundum.
  • We apply wear-resistant and climate-resistant materials on the top surface layers so that the product can be used under very harsh conditions.

KIO Manhole Cover Catalogue – PDF (4.2MB)

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KIO Composite Material Manhole Cover Video

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Demonstration video which emphasizes the high solidity and resistance of the manhole cover in composite material KIO, following the laying asphalt and with the passage of the road compactor. As shown in the picture, composite manhole resistesenza nessunoa difficulty in laying asphalt and transit of half heavyweights despite about 70% less than conventional cast iron manhole covers, Kio lends itself to all the typical uses of products made in traditional materials with equivalent performance and often higher.

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The video and the tests of the composite manhole cover KIO: the first manhole cover in composite material with patented technology!


We can custom make any manhole design, pattern or company logo on the surface of the covers giving a personal finish to your manhole cover project.

Application Temperature Scope

The materials used to manufacture the manhole covers are important, that is why we only use quality materials. The main material that contributes to the product application is the non-saturated polyester resin. It belongs to the thermosetting resin, the performance after its solidification is as follows:

  • Longitudinal strength:250-600Mpa
  • Compressive strength:300-600Mpa
  • Stretch modulus:25-35Gpa
  • Break elongation ratio:1.3-10.0%
  • Bending strength:700-1400Mpa
  • Curving module:25-35Gpa
  • Poisson-ratio:0.35
  • Relative density:1.11-1.15
  • Water-absorptive(24h):10-30mg
    • C250(can load 25tons) D400(can load 40tons)
      • Volume resistivity.1*(1012-1014)cm
      • general application temperatures in -40~80

The Service Life

  • Under normal working conditions, service life should be 50 years.
  • Our manhole covers can withstand more than 2 million fatigue shocks.

Manhole Cover Specifications

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  • Diameter: 600(mm)
  • Load Ability: D400
  • Approx. Weight: 50kg
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  • Clear Openess 600 (mm)
  • Load Ability: D400
  • Approx. Weight: 58kg
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  • Clear Openness 600*600 (mm)
  • Load Ability: C250
  • Approx. Weight: 61kg
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  • Rain-Grating:

    • Size: 400*420*30 (mm)
    • Load Ability: B50
    • Approx. Weight: 18.6kg