GB/T 27806-2011 "Epoxy Coal Tar Anti-Corrosion Coatings" specifies the classification, requirements, test methods, and other aspects of two-component epoxy coal tar anti-corrosion coatings, which primarily use epoxy resin and coal tar as film-forming substances. It is applicable to general-purpose, high-build, primer, and topcoat products. The standard covers product condition requirements such as state in container, non-volatile content, drying time, as well as physical, mechanical, and durability performance indicators including bending resistance, impact resistance, water resistance, and salt spray resistance. Testing requires instruments such as coating thickness gauges, impact testers, and salt spray test chambers, providing a unified standard for quality control of heavy-duty anti-corrosion materials used on underwater and underground steel structures and concrete surfaces.