This is a protective coating applied to corrugated steel pipe by qualified appliers. The pipe is coated on both sides with protective polymer coating that conforms to AST A 742 and AASHTO M-246 and is a minimum of 250 microns thick. The polymer is composed of polyethylene and acrylic acid copolymer – and labelled ‘Trenchcoat protective film’.
The coating bonds to the corrugated steel pipe both chemically and physically, becoming an integral part of the galvanised steel pipe. Extensive industrial tests have shown that it can offer ten times the adhesive peel strength of asphalt coating materials. It’s resistant to corrosion and abrasion. It can also withstand abuse during fabrication, handling and installation, so it offers superior durability without limiting design.