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Ammonium hydrogen difluoride

CAS No.1341-49-7
Chemical Name:Ammonium hydrogen difluoride
CBNumber:CB0273686
Molecular Formula:F2H5N
Formula Weight:57.04
MOL File:1341-49-7.mol

Ammonium hydrogen difluoride Property

Melting point 125 °C(lit.)
Boiling point 230 °C
Density 1,5 g/cm³
vapor pressure 1 hPa (20 °C)
Flash point 238°C
storage temp. Store at room temperature.
solubility 630g/l
form Solid
pka 6.3[at 20 ℃]
Specific Gravity 1.5
color White
PH 2 (5.7g/l, H2O, 20℃)
Odor acidic odor
Water Solubility 630 g/L (20 ºC)
Sensitive Hygroscopic
Merck 14,498
Exposure limits ACGIH: TWA 2.5 mg/m3
NIOSH: IDLH 250 mg/m3; TWA 2.5 mg/m3
Stability hygroscopic
InChIKey KVBCYCWRDBDGBG-UHFFFAOYSA-N
CAS DataBase Reference 1341-49-7(CAS DataBase Reference)
Indirect Additives used in Food Contact Substances AMMONIUM BIFLUORIDE
FDA 21 CFR 175.105
EWG's Food Scores 2
FDA UNII C2M215358O
EPA Substance Registry System Ammonium bifluoride (1341-49-7)
UNSPSC Code 12352302
NACRES NA.55

Safety

Hazard Codes :T,C
Risk Statements :25-34
Safety Statements :22-26-37-45-36/37/39
RIDADR :UN 1727 8/PG 2
WGK Germany :1
RTECS :BQ9200000
F :3-9
Hazard Note :Toxic/Corrosive/Hygroscopic
TSCA :Yes
HazardClass :8
PackingGroup :II
HS Code :28261910
Hazardous Substances Data :1341-49-7(Hazardous Substances Data)

NFPA 704:

	0
3		1

Hazard and Precautionary Statements (GHS)

Symbol(GHS)
Signal wordDanger
Hazard statements H301-H314
Precautionary statements P260-P270-P280-P303+P361+P353-P304+P340+P310-P305+P351+P338

Ammonium hydrogen difluoride Price More Price(15)

Brand: Sigma-Aldrich(India)
Product number: 455830
Product name : Ammonium hydrogen difluoride
Purity: 99.999% trace metals basis
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Brand: Sigma-Aldrich(India)
Product number: 455830
Product name : Ammonium hydrogen difluoride
Purity: 99.999% trace metals basis
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Brand: Sigma-Aldrich(India)
Product number: 224820
Product name : Ammonium hydrogen difluoride
Purity: reagent grade, 95%
Packaging: 25G
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Brand: Sigma-Aldrich(India)
Product number: 224820
Product name : Ammonium hydrogen difluoride
Purity: reagent grade, 95%
Packaging: 500G
Price: ₹7783.18
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Brand: Sigma-Aldrich(India)
Product number: 224820
Product name : Ammonium hydrogen difluoride
Purity: reagent grade, 95%
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Ammonium hydrogen difluoride Chemical Properties,Usage,Production

Chemical Properties Ammonium bifluoride.
Chemical Properties white scales or flakes, also referred to asammonium hydrogen fluoride, anunonium difluoride and anunonium acid fluoride.
Physical properties Orthorhombic or tetragonal crystals; etches glass; deliquescent; density 1.50 g/cm3; refractive index 1.390; melts at 125.6°C; very soluble in water; slightly soluble in alcohol.
Uses In manufacture of Mg and Mg alloys; in brightening of Al; for purifying and cleansing various parts of beer-dispensing apparatus, tubes, etc., sterilizing dairy and other food equipment; in glass and porcelain industries; as mordant for aluminum; as a "sour" in laundering cloth. In lab production of HF.
Uses Ammonium hydrogen fluoride is used as a chemical reagent in analysis and an antiseptic. It is also used in ceramics, electroplating, component of glass etchants as well as food processing equipment disinfectant. It acts as an intermediate in the production of hydrofluoric acid from hexafluorosilicic acid.
General Description Ammonium bifluoride solution is the white crystalline solid dissolved in water. Ammonium hydrogen difluoride is corrosive to metals and tissue. Ammonium hydrogen difluoride is used in ceramics.
Air & Water Reactions Dissolves in water and forms a weak solution of hydrofluoric acid.
Reactivity Profile AMMONIUM BIFLUORIDE reacts violently with bases. In presence of moisture will corrode glass, cement, and most metals. Flammable hydrogen gas may collect in enclosed spaces. Do not use steel, nickel, or aluminum containers [USCG, 1999].
Hazard Corrosive to skin.
Health Hazard TOXIC; inhalation, ingestion or skin contact with material may cause severe injury or death. Contact with molten substance may cause severe burns to skin and eyes. Avoid any skin contact. Effects of contact or inhalation may be delayed. Fire may produce irritating, corrosive and/or toxic gases. Runoff from fire control or dilution water may be corrosive and/or toxic and cause pollution.
Fire Hazard Non-combustible, substance itself does not burn but may decompose upon heating to produce corrosive and/or toxic fumes. Some are oxidizers and may ignite combustibles (wood, paper, oil, clothing, etc.). Contact with metals may evolve flammable hydrogen gas. Containers may explode when heated.
Flammability and Explosibility Non flammable
Safety Profile Caustic poison and strong irritant by all routes. See also HYDROFLUORIC ACID. When heated to decomposition it emits very toxic fumes of F-, NO,, and NH3.
Potential Exposure It is used as a sterilizer, in dairy and brewery operations; in the ceramic, glass, and electroplating industries; as a laundry sour.
Shipping Administer oxygen if breathing is difficult. Remove and isolate contaminated clothing and shoes. In case of contact with substance, immediately flush skin or eyes with running water for at least 20 minutes. For minor skin contact, avoid spreading material on unaffected skin. Keep victim warm and quiet. Effects of exposure (inhalation, ingestion or skin contact) to substance may be delayed. Ensure that medical personnel are aware of the material(s) involved and take precautions to protect themselves. Medical observation is recommended for 24 to 48 hours after breathing overexposure, as pulmonary edema may be delayed. As first aid for pulmonary edema, a doctor or authorized paramedic may consider administering a drug or other inhalation therapy.
Properties and Applications Ammonium hydrogen difluoride (NH4HF2) is an inexpensive reagent compared to known anticaries fluorides such as NaF, SnF2, etc. In addition, ammonium bifluoride is reported as a potent inhibitor of caries-like lesion formation in vitro. For instance, Tyler and Poole have studied fluoride uptake by human surface enamel from ammonium bifluoride in vitro. They noticed a reduction in the penetration of caries-like lesions in the case of specimens treated with 1% aq. NH4HF2. A study reports the fluorination of hydroxyapatite powder using ammonium hydrogen difluoride as a fluorinating agent by three different routes, viz., solid-state method, reflux method, and pH cycle method. The FT-IR and powder XRD results confirm the inter-diffusion of ‘F’ and ‘OH’- ions and the formation of homogeneous products of partially fluorinated hydroxyapatite. Compared to many other fluoride sources, NH4HF2 has the advantages of solubility and cost[1].
Incompatibilities Incompatible with oxidizers (chlorates, nitrates, peroxides, permanganates, perchlorates, chlorine, bromine, fluorine, etc.); contact may cause fires or explosions. Keep away from alkaline materials, strong bases, strong acids, oxoacids, epoxides. In the presence of moisture corrodes concrete, metals, glass.
Waste Disposal May be buried in a specially designated chemical landfill. Aqueous wastes may be reacted with an excess of lime followed by lagooning and either recovery or land disposal of the separated calcium fluoride.
References [1] V. Geetha, G. Buvaneswari. “Ammonium hydrogen difluoride induced fluorination of hydroxyapatite.” Materials Research Bulletin 45 12 (2010): Pages 1866-1870.