is a composite material profile made of E-glassfiber, unsaturated polyester resin or vinyl resin by SMC process.

•High strength, the tensile strength of FRP material is equivalent to that of Q235 steel, and the compressive strength is more than twice that of C30X. Its impact resistance, vibration, fatigue, and fracture resistance are better than steel, iron and other materials. It is used as a bearing structure of the manhole cover. Strength and safety conditions are easier to meet than iron manhole covers.

FRP manhole covers are mainly used for municipal roads, water supply, power supply, post and telecommunications, street lamps, residential quarters, garden planning, oil and gas exploitation, chemical production, sewer covers, environmental sanitation and other projects.

3. Ordinary type: roads or parking places where cars of class 10 and below pass.