Phosphorodifluoridic acid

  • Difluorophosphoric acid
  • Fluophosphoric acid
Formula
F2HO2P
Structure
Description
A mobile colorless strongly fuming liquid.

Registry Numbers and Inventories.
CAS
13779-41-4
EC (EINECS/ELINCS)
237-421-6
RTECS
TD4460000
RTECS class
Other
UN (DOT)
1768
Beilstein/Gmelin
100876 (G)
Canada DSL/NDSL
NDSL
US TSCA
Listed
Austrailia AICS
Listed
Korea ECL
Listed

Properties.
Formula
F2HO2P
Formula mass
101.98
Melting point, °C
-95
Boiling point, °C
115.9
Density
1.583 g/cm3 (20 C)
Solubility in water
Very soluble
Viscosity
0.0916 P (0 C)
Heat of vaporization
39.2 kJ/mol

Hazards and Protection.
Storage
Keep in a cool, dry, dark location in a tightly sealed container or cylinder. Keep away from incompatible materials, ignition sources and untrained individuals. Secure and label area. Protect containers/cylinders from physical damage.
Handling
All chemicals should be considered hazardous. Avoid direct physical contact. Use appropriate, approved safety equipment. Untrained individuals should not handle this chemical or its container. Handling should occur in a chemical fume hood.
Protection
Wear appropriate protective gloves, clothing and goggles.
Respirators
Wear positive pressure self-contained breathing apparatus (SCBA).
Small spills/leaks
Keep material out of water sources and sewers. Build dikes to contain flow as necessary. Use water spray to knock-down vapors. Neutralize spilled material with crushed limestone, soda ash, or lime.
Stability
No data.
Incompatibilities
Reacts exothermically with chemical bases (examples: amines, amides, and inorganic hydroxides) React 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 Reacts with cyanide compounds to release gaseous hydrogen cyanide.
Decomposition
Heat or moisture can result in the formation of highly toxic fumes including HF.

Fire.
Flash Point,°C
>110
Fire fighting
Extinguish fire using agent suitable for type of surrounding fire. (Material itself does not burn or burns with difficulty.) Use water in flooding quantities as fog. Cool all affected containers with flooding quantities of water. Apply water from as far a distance as possible.
Fire potential
Non-combustible, substance itself does not burn but may decompose upon heating to produce corrosive and/or toxic fumes.
Hazards
Contact with metals may evolve flammable hydrogen gas.
Combustion products
Irritating and toxic fumes of hydrogen fluoride and phosphoric acid may be formed in fires.

Health.
Exposure effects
   Ingestion
See Inhalation.
   Inhalation
TOXIC; inhalation, ingestion, or skin contact with material may cause severe injury or death. Effects of contact or inhalation may be delayed.
   Skin
Contact with molten substance may cause severe burns to skin and eyes. See Inhalation.
   Eyes
See Inhalation.

First aid
 
   Ingestion
Seek medical assistance.
   Inhalation
Remove from exposure and support respiration.
   Skin
Remove and isolate contaminated clothing and shoes. Immediately flush with running water for at least 20 minutes. For minor skin contact, avoid spreading material on unaffected skin.
   Eyes
Wash with copious volumes of water for at least 15 min.

Transport.
UN number
1768
Response guide
Hazard class
8
Packing Group
II
 
USCG CHRIS Code
DFA
 
Std. Transport #
4930214