O-A-548D, FEDERAL SPECIFICATION: ANTIFREEZE/COOLANT, ENGINE; ETHYLENE, INHIBITED, CONCENTRATED (22-MAR-1974) [S/S BY S/S BY A-A-870]

O-A-548D, FEDERAL SPECIFICATION: ANTIFREEZE/COOLANT, ENGINE; ETHYLENE, INHIBITED, CONCENTRATED (22-MAR-1974) [S/S BY S/S BY A-A-870]., This specification covers concentrated inhibited ethylene glycol, suitable for use in cooling system of liquid cooled internal combustion engines, other than aircraft, for a year-round protection against corrosion, scale, sludge, and freezing in ambient temperatures as low as -60 deg F.