Ammonium bifluoride

  • Ammonium hydrogen fluoride
  • Acid ammonium fluoride
  • Ammonium hydrogen difluoride
  • Ammonium bifluoride, solution (UN 2817)
  • Ammonium hydrogen fluoride, solution (UN 2817)
  • Ammonium hydrogen difluoride, solution (UN 2817)
Formula
NH4F.HF
Structure
Description
A white crystalline solid.
Uses
Manufacture of magnesium and magnesium alloys, brightening of aluminum, purifying & cleansing beer dispensing apparatus, tube, sterilizing dairy & other food equipment, glass & porcelain industries, mordant for aluminum, as a sour in laundering cloth, lab production of hydrogen fluoride.

Registry Numbers and Inventories.
CAS
1341-49-7
EC (EINECS/ELINCS)
215-676-4
EC Index Number
009-009-00-4
EC Class
Toxic; Corrosive
R 25 34
S 22 26 37 45
RTECS
BQ9200000
RTECS class
Other
UN (DOT)
1727, 2817
Merck
13,498
Beilstein/Gmelin
15720 (G)
Swiss Giftliste 1
G-1103
Canada DSL/NDSL
DSL
US TSCA
Listed
Austrailia AICS
Listed
New Zealand
Listed
Japan ENCS (MITI)
Listed
Korea ECL
Listed

Properties.
Formula
F2H5N
Formula mass
57.04
Melting point, °C
127
Vapor pressure, mmHg
0.75
Vapor density (air=1)
N/R
Density
0.8 g/cm3
Solubility in water
415 g/L
Heat of fusion
16.74 kJ/mol
Heat of vaporization
65.3 kj/mol

Hazards and Protection.
Storage
Keep away from heat and flame. Keep container closed when not in use. Store in a tightly closed container. Store in a cool, dry, well-ventilated area away from incompatible substances. Corrosives area. Keep away from acids. Keep away from strong bases. Store protected from moisture.
Handling
Wash thoroughly after handling. Use only in a well ventilated area. Minimize dust generation and accumulation. Do not breathe dust, vapor, mist, or gas. Do not get in eyes, on skin, or on clothing. Keep container tightly closed. Do not ingest or inhale. Use only in a chemical fume hood. Discard contaminated shoes.
Protection
Eyes: Wear appropriate protective eyeglasses or chemical safety goggles as described by OSHA's eye and face protection regulations in 29 CFR 1910.133 or European Standard EN166. Skin: Wear appropriate protective gloves to prevent skin exposure. Clothing: Wear appropriate protective clothing to prevent skin exposure.
Respirators
A respiratory protection program that meets OSHA's 29 CFR 1910.134 and ANSI Z88.2 requirements or European Standard EN 149 must be followed whenever workplace conditions warrant a respirator's use.
Small spills/leaks
Vacuum or sweep up material and place into a suitable disposal container. Avoid runoff into storm sewers and ditches which lead to waterways. Clean up spills immediately, using the appropriate protective equipment. Avoid generating dusty conditions. Provide ventilation.
Stability
Stable under normal temperatures and pressures.
Incompatibilities
Moisture, acids, bases, glass.
Decomposition
Hydrogen fluoride, ammonia and/or derivatives.

Fire.
Fire fighting
Wear a self-contained breathing apparatus in pressure-demand, MSHA/NIOSH (approved or equivalent), and full protective gear. During a fire, irritating and highly toxic gases may be generated by thermal decomposition or combustion. Use water spray to keep fire-exposed containers cool. Wear appropriate protective clothing to prevent contact with skin and eyes. Wear a self-contained breathing apparatus (SCBA) to prevent contact with thermal decomposition products. Contact with metals may evolve flammable hydrogen gas. Containers may explode when heated. Non-combustible, substance itself does not burn but may decompose upon heating to produce corrosive and/or toxic fumes. Extinguishing media: Use water spray to cool fire-exposed containers. Substance is noncombustible; use agent most appropriate to extinguish surrounding fire. Do NOT get water inside containers. For small fires, use dry chemical, carbon dioxide, or water spray. For large fires, use dry chemical or carbon dioxide.
Fire potential
Moderately flammable. Flammable hydrogen gas may collect in enclosed spaces.
Hazards
Contact with metals may evolve flammable hydrogen gas.
Combustion products
Toxic ammonia, hydrogen fluoride, hydrofluoric acid, and hydrogen gases may form in fire.
Health
3
 
Flammability
0
 
 
Reactivity
0
 

Health.
Poison_Class
2
Exposure effects
Chronic inhalation and ingestion may cause fluorosis with skeletal abnormalities. May cause digestive tract disturbances. Effects may be delayed. Chronic exposure to fluoride compounds may cause systemic toxicity.
   Ingestion
Harmful if swallowed. May cause severe and permanent damage to the digestive tract. May cause kidney damage. May cause perforation of the digestive tract. Causes severe digestive tract burns with abdominal pain, vomiting, and possible death. Inorganic fluorides can be harmful. Acute exposure to fluorine compounds can lead to digestive tract burns, and abdominal pain. Fluoride can reduce calcium levels leading to fatal hypocalcemia. May cause systemic effects.
   Inhalation
Causes chemical burns to the respiratory tract. Inhalation may be fatal as a result of spasm, inflammation, edema of the larynx and bronchi, chemical pneumonitis and pulmonary edema. Aspiration may lead to pulmonary edema. Depletes calcium levels in the body which can lead to hypocalcemia and death. May cause systemic effects.
   Skin
Contact with liquid is corrosive and causes severe burns and ulceration. May penetrate the skin and cause severe necrosis and bone destruction. May cause skin rash (in milder cases), and cold and clammy skin with cyanosis or pale color.
   Eyes
Causes eye burns. May cause chemical conjunctivitis and corneal damage.

First aid
 
   Ingestion
Do NOT induce vomiting. If victim is conscious and alert, give 2-4 cupfuls of milk or water. Never give anything by mouth to an unconscious person. Get medical aid immediately.
   Inhalation
Get medical aid immediately. Remove from exposure to fresh air immediately. If not breathing, give artificial respiration. If breathing is difficult, give oxygen. DO NOT use mouth-to-mouth respiration. If breathing has ceased apply artificial respiration using oxygen and a suitable mechanical device such as a bag and a mask.
   Skin
Get medical aid immediately. Immediately flush skin with plenty of soap and water for at least 15 minutes while removing contaminated clothing and shoes. Wash clothing before reuse. Destroy contaminated shoes.
   Eyes
Get medical aid immediately. Do NOT allow victim to rub or keep eyes closed. Extensive irrigation is required (at least 30 minutes).

Transport.
UN number
1727, 2817
Response guide
Hazard class
8
Packing Group
II
 
USCG CHRIS Code
ABF
 
Std. Transport #
4932307