Manufacturers direct composite resin manhole cover sewage rainwater power well weak current negative manhole cover square drainage
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About Product:In 2009, the inspection GB/ t23858-2009 was issued, which defined the composite manhole cover as a kind of inspection manhole cover, and explained its characteristics: Using polymer as matrix material, adding reinforcement material, filler, etc., Through a certain process of composite inspection manhole cover. The new gb standard has raised The load requirements for manhole covers in line with The international standard Came into effect on February 1, 2010.
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