- Standardofponding:pondingnotdeeperthan3mm(thethicknessofHK$5.00coin)ineveryparticular1000mmlengthcanbeaccepted.Thecement-sodiumsilicatebinaryslurryapplicationinpitminespondingconstructionSolvingtheproblemofleakageandpondinginGRPtoiletformarineapplica...
- 12422