STA-VIS Heat Transfer Oil is special blend of solvent refined, paraffinic base oils, containing effective oxidation, rust, and corrosion inhibitors. Its excellent resistance to oxidation minimizes the formation of sludge, tar, and coke deposits which interfere with fluid circulation and efficient heat transfer. Low pressure minimizes fluid loss due to evaporation, vapor locks, and hazards of flammability; and is non-corrosive to aluminum, brass, bronze, copper, and steel.