This specification covers a two-component coal tar epoxy-polyamide black (or dark red) paint for structural steel. It is self-priming and exhibits good adhesion to clean structural steel and concrete surfaces.
This paint is suitable for exposures in Environmental Zones 2A (frequently wet by fresh water), 2B (frequently wet by salt water), 2C (fresh water immersion), 2D (salt water immersion), 3A (chemical, acidic), 3B (chemical, neutral), and 3C (chemical, alkaline); and is intended for spray application over steel surfaces prepared in accordance with SSPC-SP 6, “Commercial Blast Cleaning,” or SSPC-SP 8, “Pickling.” It is to be applied in accordance with SSPC-PA 1, “Shop, Field, and Maintenance Painting of Steel.” The adhesion of the coating to smooth surfaces such as cold-rolled steel or intact mill scale has been found to be substantially inferior to that attained on blast roughened surfaces.
The coal tar epoxy-polyamide black (or dark red) paint consists of two parts. Component A contains a refined coal tar pitch, a liquid-type polyamide resin, and a polyamine promoter to accelerate curing rate. Component B is a liquidtype epoxy resin which is mixed into Component A just prior to application.
This paint contains approximately 71% by volume of nonvolatile film-forming solids (pigment and binder). The theoretical spreading rate for a 8 mil (200 micrometers) dry film thickness is 142 square feet/U.S. gallon (3.5 square meters/liter). Actual spreading rates can be significantly lower.
