Nitrogen trifluoride

  • Nitrogen fluoride
  • Trifluoramine
  • Trifluorammonia
Formula
NF3
Structure
Description
A colorless gas with a moldy odor.
Uses
In high-power chemical lasers, plasma etching of semiconductor materials, production of perfluoroammonium salts, a proposed gas filler to increase the life and brightness of lamps, oxidizing agent in rocketry (not yet commercialized, 1988).

Registry Numbers and Inventories.
CAS
7783-54-2
EC (EINECS/ELINCS)
232-007-1
RTECS
QX1925000
RTECS class
Other
UN (DOT)
2451
Merck
12,6701
Beilstein/Gmelin
1551 (G)
Canada DSL/NDSL
DSL
US TSCA
Listed
Japan ENCS (MITI)
Listed
Korea ECL
Listed

Properties.
Formula
F3N
Formula mass
71.00
Melting point, °C
-207.15
Boiling point, °C
-129.1
Vapor pressure, mmHg
0.15 (-193.3 C)
Vapor density (air=1)
2.46
Critical temperature
-39
Critical pressure
44.7
Density
1.885 g/cm3 (-129 C)
Solubility in water
Slightly soluble
Heat of vaporization
11.59 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. Always wear thermal protective clothing when handling refrigerated/cryogenic liquids.
Respirators
Wear positive pressure self-contained breathing apparatus (SCBA).
Small spills/leaks
Attempt to stop leak if without undue personnel hazard.
Stability
No data.
Incompatibilities
Can react violently with hydrogen, ammonia, carbon monoxide, diborane, hydrogen sulfide, methane, tetrafluorohydrazine, charcoal.
Decomposition
On decomposition, it emits highly toxic fumes of hydrogen fluoride.

Fire.
Fire fighting
Extinguish fire using agent suitable for type of surrounding fire. (Material itself does not burn or burns with difficulty.) Cool all affected containers with flooding quantities of water. Apply water from as far a distance as possible.
Fire potential
Substance does not burn but will support combustion.
Hazards
Some may react explosively with fuels. May ignite combustibles (wood, paper, oil, clothing, etc.). Vapors from liquefied gas are initially heavier than air and spread along ground. Runoff may create fire or explosion hazard. Containers may explode when heated. Ruptured cylinders may rocket.
Health
3
 
Flammability
3
 

Health.
Exposure limit(s)
TLV: 10 ppm; 29 mg/m3 (as TWA) (ACGIH 1995-1996).
Exposure effects
Seizures and CNS depression were reported in animals most likely secondary to anoxia from methemoglobinemia.
   Inhalation
Cyanosis was reported in animal studies most likely due to methemoglobinemia.
   Skin
Contact with gas or liquefied gas may cause burns, severe injury and/or frostbite.
   Eyes
Dogs exposed to 9600 ppm for 60 minutes developed slight eye irritation (Proctor et al, 1988).

First aid
 
   Ingestion
Seek medical assistance.
   Inhalation
Move patient to fresh air. Monitor for respiratory distress. If cough or difficulty breathing develops, evaluate for respiratory tract irritation, bronchitis, or pneumonitis. Administer oxygen and assist ventilation as required. Treat bronchospasm with beta2 agonist and corticosteroid aerosols.
   Skin
Remove and isolate contaminated clothing and shoes. Immediately flush with running water for at least 20 minutes. In case of contact with liquefied gas, thaw frosted parts with lukewarm water.
   Eyes
Irrigate exposed eyes with copious amounts of tepid water for at least 15 minutes. If irritation, pain, swelling, lacrimation, or photophobia persist, the patient should be seen in a health care facility.

Transport.
UN number
2451
Response guide
Hazard class
2.2
Std. Transport #
4920361 4904564