Phosphorodifluoridicacid (13779-41-4)

1.General Description: Phosphorodifluoridic acid (CAS NO.13779-41-4) is corrosive to glass, fabric, metals and tissue.
2.Air & Water Reactions: Fumes in air. Reacts vigorously with water to form corrosive and toxic hydrofluoric acid and heat.
3.Reactivity Profile: Difluorophosphoric acid reacts exothermically with chemical bases (examples: amines, amides, and inorganic hydroxides). These reactions can generate dangerously large amounts of heat in small spaces. Reacts vigorously with water to form corrosive and toxic hydrofluoric acid and heat. Reacts with active metals, including such structural metals as aluminum and iron, to release hydrogen, a flammable gas. Can initiate the polymerization of certain alkenes. Reacts with cyanide compounds to release gaseous hydrogen cyanide. Generates flammable and/or toxic gases in contact with dithiocarbamates, isocyanates, mercaptans, nitrides, nitriles, sulfides, and strong reducing agents. Additional gas-generating reactions occur with sulfites, nitrites, thiosulfates (to give H₂S and SO₃), dithionites (SO₂), and carbonates. May catalyze (increase the rate of) chemical reactions.
4.Health Hazard: Inhalation causes severe irritation of upper respiratory tract. Contact with liquid causes severe irritation of eyes and skin. Ingestion causes severe burns of mouth and stomach.
5.Fire Hazard: Special Hazards of Combustion Products: Irritating and toxic fumes of hydrogen fluoride and phosphoric acid may be formed in fires.

Reported in EPA TSCA Inventory.