DIFLUOROPHOSPHORIC ACID

IUPAC Name: Difluorophosphinic acid
Synonyms of Phosphorodifluoridic acid (CAS NO.13779-41-4) : Phosphorodifluoridic acid ; Difluorophosphoric acid ; Difluorophosphoric acid (solution)
CAS NO: 13779-41-4
Molecular Formula:HF₂O₂P
Molecular Weight :101.9773
Molecular Structure :
Index of Refraction: 1.281
Surface Tension: 27.6 dyne/cm
Density: 1.669 g/cm³
Melting Point: -75 °C
Boiling Point: 115,9°C
Appearance:A mobile colorless strongly fuming liquid.

Reported in EPA TSCA Inventory.

Toxic and corrosive material. Very irritating to the skin, eyes, and mucous membranes. When heated to decomposition it emits very toxic fumes of PO_x and F⁻. Used as a catalyst. See also PHOSPHORODIFLUORIDIC ACID, anhydrous.

Hazard Codes C
Risk Statements 20/21/22-35
R20/21/22: Phosphorodifluoridic acid (CAS NO.13779-41-4) is harmful by inhalation, in contact with skin and if swallowed. 
R35:Causes severe burns.
Safety Statements 26-27-36/37/39-45
S26: In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. 
S27:Take off immediately all contaminated clothing. 
S36/37/39:Wear suitable protective clothing, gloves and eye/face protection. 
S45:In case of accident or if you feel unwell, seek medical advice immediately (show the label whenever possible.)
RIDADR 3264
Hazard Note Corrosive
HazardClass 8
PackingGroup II

OSHA PEL: TWA 2.5 mg(F)/m³
ACGIH TLV: TWA 2.5 mg(F)/m³; BEI: 3 mg/g creatinine of fluorides in urine prior to shift; 10 mg/g creatinine of fluorides in urine at end of shift.
NIOSH REL: TWA 2.5 mg(F)/m³
DOT Classification:  8; Label: Corrosive

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.