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The U.S. Army Corps of Engineers owns and operates the vast majority of the country’s lock and dam structures for inland navigation. The large steel gates on these structures are subjected to an extremely severe impact and abrasive environment while in immersion. Extremely high VOC vinyl resin coatings have historically been the best available coatings for structures in this environment, but have exhibited very poor performance at the water line where the impact and abrasion is at its worst. Lifetimes of only 1-2 years for vinyl resin coatings and 5-10 years for metalizing have been the norm.
Current demonstrations and laboratory testing of two different ceramic composite coatings and an adhesively applied ultra high molecular weight polyethylene (UHMWPE) sheet applied only at the water line have shown to provide superior protection and increased life expectancy, thereby eliminating the need for regular repair of an extremely high VOC coating.
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