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Underwater curing ETS URETHANE MATIBA 977W, waterproofing/ anticorrosive work

General Information

ETS URETHANE coating (MATIBA 977W) is a waterproofing product which is mixed the main materials of urethane resin or epoxy resin with colorants. This membrane forms a flexible and impermeable barrier to water, ice and wide range of chemicals. It has no solvents, no volatile organic content and is insoluble in water.

Why the anticorrosive coating is needed

The anticorrosive against water including chemicals is partially mentioned in the ACI but it is also written that it is hardly applied to the general sewage disposal plant. If there is possibility of H2S gas leaking, the necessity of anticorrosive coating is getting increased as a safeguard against accidents.In general, waste water includes the organic matters such as sulfutes and sulfur, and sulfuric acid (H2SO4) is formed by atmospheric oxidation of sulfur dioxide in the presence of water through the following steps.

Sulfate Reducing Bacteria : The first step SO4 + 2C + 2H2O --------------- → H2S + 2HCO3(Anaerob)
Sulfur-Oxidizing Bacteria : The second step H2S + 2O2 ------------- → H2SO4(Aerobik)

The above reactions are mainly occurred on the surface of water due to the atmospheric oxidation by anaerobe and aerobic reactions. H2S gas does not seriously damage structures if the place is well ventilated since it spreads rapidly into the air.If the place is covered with pavement or completely sealed, H2S gas is easily formed and then it corrodes the concrete and promotes biodeterioration. Water sterilized with chlorine in filtration plants causes the corrosion of concrete since the chloric gas evaporates and produces hydrochloric acid by reacting with oxygen and water in the air.Therefore, acid tolerant anticorrosive work should be done for the extended life limit and the safety at the place where can be damaged by the acid due to the structure type or ventilation. The ETS URETHANE MATIBA 977 W coating or lining from anticorrosive materials naturally waterproofs the structures.

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