Hydrofluoric Acid cas no:7664-39-3

NameHydrofluoric Acid
CAS7664-39-3
SynonymsHydrogen fluoride,anhydrous; HF; hydrogen fluoride
EINECS(EC#)231-634-8
Molecular FormulaHF
Molecular Weight20.01

Appearancecolourless gas with a pungent odour
storage tempProtect against physical damage. Store at in well-ventilated area, separated from other storage.
Sensitive Hygroscopic

Hazardclass8

Hazard C:Corrosive
Risk R26/27/28;R35
Safety

 A human poison by inhalation. A poison experimentally by inhalation, subcutaneous, and intraperitoneal routes. A corrosive irritant to skin, eyes ( 0.05 mg/L), and mucous membranes. Experimental teratogenic effects. Experimental reproductive effects. Mutation data reported. Inhalation of the vapor may cause ulcers of the upper respiratory tract. Concentrations of 50–250 ppm are dangerous, even for brief exposures. Hydrofluoric acid produces severe skin burns that are slow in healing. The subcutaneous tissues may be affected, becoming blanched and bloodless. Gangrene of the affected areas may follow. It is a common air contaminant.

 Explosive reaction with cyanogen fluoride; glycerol + nitric acid; sodium (with aqueous acid); methanesulfonic acid (evolves oxygen difluoride that explodes). Violent reaction with As₂O₃; P₂O₅; acetic anhydride; 2-amino ethanol; NH₄OH; HBiO₃; bismuthic acid (evolves oxygen); CaO; chlorosulfonic acid; ethylene diamine; ethylene imine; F₂; mercury(II) oxide + organic materials (above 0°C); n-phenylazopiperidine; potassium permanganate; potassium tetrafluorosilicate(2-)(evolves silicon tetrafluoride gas); (HNO₃ + lactic acid); oleum; β-propiolactone; propylene oxide; Na; NaOH; H₂SO₄; vinyl acetate; HgO; sodium tetrafluoro silicate; n-phenyl azo piperidine. Incandescent reaction of liquid HF with oxides (e.g., arsenic trioxide, calcium oxide). Dangerous storage hazard with nitric acid + lactic acid; nitric acid + propylene glycol (mixtures evolve gas which may burst a sealed container). Reacts with water or steam to produce toxic and corrosive fumes. When heated to decomposition it emits highly corrosive fumes of F⁻. See also FLUORIDES.

Hazard Codes: T+;C,T,Xn
Risk Statements: 26/27/28-35-36/37/38-20/21/22
R26/27/28:Very toxic by inhalation, in contact with skin and if swallowed. 
R35:Causes severe burns. 
R36/37/38:Irritating to eyes, respiratory system and skin. 
R20/21/22:Harmful by inhalation, in contact with skin and if swallowed.
Safety Statements: 26-36/37/39-45-7/9-36/37-28-36
S26: In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. 
S36/37/39:Wear suitable protective clothing, gloves and eye/face protection. 
S45:In case of accident or if you feel unwell, seek medical advice immediately (show the label whenever possible.) 
S36/37:Wear suitable protective clothing and gloves. 
S28:After contact with skin, wash immediately with plenty of soap-suds. 
S36:Wear suitable protective clothing.
RIDADR: UN 1790 8/PG 2
WGK Germany: 2
RTECS: MW7875000
Hazard Note: Corrosive
HazardClass: 8
PackingGroup: II

1.		dnd-dmg-ihl 1300 ppb/6W		ATENBP    Atmospheric Environment. Air Pollution, Industrial Aerodynamics, Micrometerology, Aerosols. 5 (1971),117.
2.		sln-dmg-ihl 2900 ppb		FLUOA4    Fluoride. 4 (1971),25.
3.		ihl-man TCLo:100 mg/m3/1M:NOSE,EYE,PUL		JIDHAN    Journal of Industrial Hygiene. 16 (1934),129.
4.		ihl-hmn LCLo:50 ppm/30M		34ZIAG    Toxicology of Drugs and Chemicals ,Deichmann, W.B.,New York, NY.: Academic Press, Inc.,1969,318.
5.		ihl-rat LC50:966 ppm/1H		TXAPA9    Toxicology and Applied Pharmacology. 42 (1977),417.
6.		ipr-rat LDLo:25 mg/kg		TXAPA9    Toxicology and Applied Pharmacology. 13 (1968),76.
7.		ihl-mus LC50:342 ppm/1H		JCTODH    Journal of Combustion Toxicology. 3 (1976),61.
8.		skn-mus LDLo:500 mg/kg		SAIGBL    Sangyo Igaku. Japanese Journal of Industrial Health. 17 (1975),281.
9.		ihl-mky LC50:1774 ppm/1H		AMRL**    Aerospace Medical Research Laboratory Report. (Aerospace Technical Div., Air Force Systems Command, Wright-Patterson Air Force Base, OH 45433) TR-70-77 ,1970.
10.		ihl-rbt LCLo:260 mg/m3/7H	&nbs