Beautiful SMC FRP Gully Grating or Grate for Manhole, Drainage 1.BS or EN 124 ... .Anti Corrosion of acid,alkali etc. Beautiful SMC FRP Gully Grating or Grate for Manhole, Drainage Detailed Product Description Shengwei Jiye ... FRP/GRP sewer grate is made from fiber glass reinforced plastic,the main materials are fiber glass,resin and quartz.It is ...