... manufacturer in China, specializing in producing and supplying composite materials(FRP/GRP) manhole cover, rain-grating ,tree-grating, flower ... CaCO3 as filler, as prefabricated molding. BMC molding covers--- mold plastic with reinforced ,then under a certain temperature and pressure ... All the materials are composite and environmental ,and the FRP with a strong intension but light-weight.Despite this , ...