Ammonium fluoride

  • Neutral ammonium fluoride
Formula
NH4F
Structure
Description
Ammonium fluoride is a white crystalline solid.
Uses
Etching and frosting glass, as antiseptic in brewing beer, preserving wood, in printing and dyeing textiles, as mothproofing agent.

Registry Numbers and Inventories.
CAS
12125-01-8
EC (EINECS/ELINCS)
235-185-9
EC Index Number
009-006-00-8
EC Class
Toxic
R 23/24/25
RTECS
BQ6300000
RTECS class
Other
UN (DOT)
2505
Merck
12,553
Beilstein/Gmelin
12827 (G)
Swiss Giftliste 1
G-1110
Canada DSL/NDSL
DSL
US TSCA
Listed
Austrailia AICS
Listed
New Zealand
Listed
Japan ENCS (MITI)
Listed
Korea ECL
Listed

Properties.
Formula
FH4N
Formula mass
37.03
Melting point, °C
160
Vapor pressure, mmHg
0.00300025 (15.76 C)
Vapor density (air=1)
>1
Density
1.0088 - 1.0096 g/cm3 (25 C)
Solubility in water
453 g/L

Hazards and Protection.
Storage
Keep container closed when not in use. Store in a tightly closed container. Keep from contact with oxidizing materials. Store in a cool, dry, well-ventilated area away from incompatible substances. Keep away from water. Keep away from acids. Do not store in metal or glass containers. Keep away from strong bases.
Handling
Wash thoroughly after handling. Use with adequate ventilation. Do not get in eyes, on skin, or on clothing. Keep container tightly closed. Do not ingest or inhale. Use with adequate ventilation. 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 minimize contact with skin.
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. Follow the OSHA respirator regulations found in 29CFR 1910.134 or European Standard EN 149. Always use a NIOSH or European Standard EN 149 approved respirator when necessary.
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. Do not get water inside containers.
Stability
Stable under normal shipping and handling conditions. Forms hydrochloric acid with water.
Incompatibilities
Strong acids, caustics, glass, metals.
Decomposition
Oxides of nitrogen, 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. 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. Substance is noncombustible. Containers may explode in the heat of a fire. Contact with metals may evolve flammable hydrogen gas. Extinguishing media: 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, carbon dioxide, alcohol-resistant foam, or water spray.
Fire potential
Nonflammable. Noncombustible.
Hazards
Contact with metals may evolve flammable hydrogen gas.
Combustion products
Toxic ammonia and hydrogen fluoride gases are formed in fires.
Health
3
 
Flammability
0
 
 
Reactivity
0
 

Health.
Exposure limit(s)
TLV (as F): ppm; 2.5 mg/m3 (as TWA) (ACGIH 1995-1996).
Poison_Class
3
Exposure effects
Chronic inhalation and ingestion may cause fluorosis with skeletal abnormalities. Skeletal effects may include bone brittleness, joint stiffness, teeth discoloration, tendon calcification, and osterosclerosis.
   Ingestion
May cause severe and permanent damage to the digestive tract. May cause vascular collapse and damage. Causes severe digestive tract burns with abdominal pain, vomiting, and possible death. May cause hemorrhaging of the digestive tract.
   Inhalation
Causes delayed lung injury. Causes chemical burns to the respiratory tract. May cause coughing, choking, chills, fever, tightness in the chest, and cyanosis.
   Skin
Causes skin burns. May cause deep, penetrating ulcers of the skin. Penetration may continue for several days.
   Eyes
Causes eye burns.

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 breathing is difficult, give oxygen. DO NOT use mouth-to-mouth respiration.
   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. Discard contaminated clothing in a manner which limits further exposure. 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
2505
Response guide
Hazard class
6.1
Packing Group
III
 
USCG CHRIS Code
AFR
 
Std. Transport #
4925193
 
IMO Chemical Code
#
IMO Pollution Category
D