... , durableApplications:1,Molded resin covers, composite materials SMC covers , composite material BMC covers, magnesium covers, resin covers, ... well, heat supplied, gas well4,Round SMC Manhole Cover&Circle BMC manhole covers&resin fiberglass covers&Molded resin covers ... cover board for anti-corrosion project, open ditch;it was well as can made according to customers requirements BMC composite manhole ...