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 its cheaper cost and low investment and simple technology.
- BMC is the abbreviation of Bulk molding compounds.
- SMC is the abbreviation of sheet molding compound.
- FRP is abbreviation of fiber reinforce plastic and GRP is abbreviation of glass reinforce Plastic. We call FRP or GRP manhole covers for our manhole covers products.