Internal Boiler Coating Compound

A liquid composition of nonspecified material formulated for application on the interior steel and iron surfaces of boilers and boiler tubes to form a rustproof surface to which water scale does not bond as tightly as to bare steel. It is resistant to hot water and steam. It is not affected by high boiler pressure nor by wet heat. It does not appreciably retard heat transfer. See also rust arresting coating and resin coating, thermosetting.