Breakthroughs in 100% solids polyurethane coating technology have produced higher performing, non-flammable polyurethane coatings with 2000+ PSI adhesion to steel without primers and zero VOC’S. These coatings have produced environmentally friendly solutions to
anti-corrosion tank protection while meeting the requirements of Underwriters Laboratories standards UL 1746 Part II and Part IV. They offer high physical properties and substantial performance, safety and environmental advantages over older systems and existing Fiberglass
Reinforced Polyester (FRP) systems. The paper briefly reviews the history of underground steel tank anti-corrosion protection and discusses Underwriters Laboratories UL 1746, Part 1, Part II and Part IV standards. It highlights the newest standard, Underwriters Laboratories UL 1746, Part IV and the advantages of systems that meet this new standard.
Keywords: 100% solids polyurethane, coatings, underground steel tanks, anti-corrosion protection, Underwriters Laboratories