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in waste water structure the most preferable kind of water proofing from out side is bituminous membrane and from inside cementious material and after this epoxy materials because its specifications non toxic , cleaning , less porosity and its ability to close cracks and keep concrete in good condition
Excellent chemical resistance Low viscosity Convenient1 to1 ratio by volume Non-blushing & non-water spotting Bonds to cold damp concrete Superior cycloaliphatic curing system More flexibility than regular epoxies.