There are only 3 types of composite manhole covers, which are BMC manhole covers, SMC manhole covers, and FRP/GRP manhole covers. Most factories in China only manufacture BMC manhole covers because of their cheaper cost and low investment and simple technology.

BMC is the abbreviation of Bulk Molding Compound

Bulk Molding Compounds.

Sheet Molding Compound

Sheet Molding Compound

FRP is the abbreviation of Fiber Reinforced Plastic and GRP is the abbreviation of Glass Reinforced Plastic.

We call FRP or GRP manhole covers for our manhole covers products.

GRP Manhole Cover