BOC Rust Preventive oils

BOC HD 326, of softer consistency, is suitable for semi-sheltered outdoor exposure and for parts stored indoor under corrosive conditions. BOC HD 326 is especially suitable for coating highly machined parts such as antifriction bearings before they are given the customary wrapping of transparent paper . The other products in this line are BOC HD 337, 339 and 623. BOC HD 337 and 339 are used in hydraulic systems, oil-lubricated bearings, gear cases, internal combustion engines, turbines, power-transmission chains, delicate instruments, cutter bars, and strip and sheet steel.

BOC HD 337 is usually used for new engines, but BOC HD 339 is mainly used for old engines.