... :2000 certificate. We can offer A15,B125,C250,D40 FRP,GRP, SMC , DMC,BMC Manhole covers, gratings,gully tops and Tress ... have the follow advantages:1.Anti-theft, the materials FRP/GRP ,SMC, DMC/BMC are not be used again.2.Anti ... -corrosion, the materials FRP/GRP ,SMC, DMC/BMC have high anti-corrosion.3. Long ... changed as per environment and customer's requirment FRP SMC Grating