Pentofrost NF is an environmentally friendly antifreeze concentrate for multipurpose applications in water-cooled engines. It does not contain any nitrites, amines or phosphorous containing additives. Pentofrost NF protects all material used in cooling systems and is recommended for non ferrous metals and year-round use. Meets ASTM D-3306. Warning: this product contains substances known to the state of California to cause birth defects or other developmental harm.