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HYDROGEN FLUORIDE ICSC: 0283
Date of Peer Review: April 2000

Hydrofluoric acid, anhydrous
(cylinder)
CAS # 7664-39-3 HF
RTECS # MW7875000 Molecular mass: 20.0
UN # 1052
EC Index # 009-002-00-6
TYPES OF HAZARD / EXPOSURE ACUTE HAZARDS / SYMPTOMS PREVENTION FIRST AID / FIRE FIGHTING
FIRE Not combustible. Many reactions may cause fire or explosion.

In case of fire in the surroundings: use appropriate extinguishing media.
EXPLOSION

In case of fire: keep cylinder cool by spraying with water but NO direct contact with water. Combat fire from a sheltered position.
EXPOSURE
AVOID ALL CONTACT!
IN ALL CASES CONSULT A DOCTOR!
Inhalation Burning sensation. Cough. Dizziness. Headache. Laboured breathing. Nausea. Shortness of breath. Sore throat. Vomiting. Symptoms may be delayed (see Notes).
Ventilation, local exhaust, or breathing protection.
Fresh air, rest. Half-upright position. Refer for medical attention.
Skin MAY BE ABSORBED! Redness. Pain. Serious skin burns. Blisters. (See Inhalation).
Protective gloves. Protective clothing.
Remove contaminated clothes. Rinse skin with plenty of water or shower. Refer for medical attention.
Eyes Redness. Pain. Severe deep burns.
Face shield or eye protection in combination with breathing protection.
First rinse with plenty of water for several minutes (remove contact lenses if easily possible), then take to a doctor.
Ingestion Abdominal pain. Burning sensation. Diarrhoea. Nausea. Vomiting. Weakness. Collapse.
Do not eat, drink, or smoke during work. Wash hands before eating.
Rinse mouth. Do NOT induce vomiting. Refer for medical attention.
SPILLAGE DISPOSAL PACKAGING & LABELLING
Evacuate danger area! Consult an expert! Ventilation. Remove vapour with fine water spray. Gas-tight chemical protection suit including self-contained breathing apparatus.
Do not transport with food and feedstuffs.
EU Classification
Symbol: T+, C
R: 26/27/28-35
S: (1/2-)-7/9-26-36/37/39-45
UN Classification
UN Hazard Class: 8
UN Subsidiary Risks: 6.1
UN Pack Group: I
EMERGENCY RESPONSE STORAGE
Transport Emergency Card: TEC (R)-80S1052 or 80GCT1-I
NFPA Code: H 3; F 0; R 2;
Fireproof. Separated from food and feedstuffs. See Chemical Dangers. Cool. Keep in a well-ventilated room.
IPCS
International
Programme on
Chemical Safety
Prepared in the context of cooperation between the International Programme on Chemical Safety and the Commission of the European Communities IPCS, CEC 2005

SEE IMPORTANT INFORMATION ON BACK
HYDROGEN FLUORIDE ICSC: 0283
IMPORTANT DATA
PHYSICAL STATE; APPEARANCE:
COLOURLESS GAS OR COLOURLESS FUMING LIQUID, WITH PUNGENT ODOUR.

CHEMICAL DANGERS:
The substance is a strong acid, it reacts violently with bases and is corrosive. Reacts violently with many compounds causing fire and explosion hazard. Attacks metal, glass, some forms of plastic, rubber and coatings.

OCCUPATIONAL EXPOSURE LIMITS:
TLV: (as F) 0.5 ppm as TWA, 2 ppm (Ceiling value); BEI issued; (ACGIH 2005).
MAK: 1 ppm, 0.83 mg/m; Peak limitation category: I(2); Pregnancy risk group: C; MAK: BAT 7 mg/g creatinine; (DFG 2005).
ROUTES OF EXPOSURE:
The substance can be absorbed into the body by inhalation, through the skin and by ingestion.

INHALATION RISK:
A harmful concentration of this gas in the air will be reached very quickly on loss of containment.

EFFECTS OF SHORT-TERM EXPOSURE:
The substance is corrosive to the eyes, the skin and the respiratory tract. Inhalation of this gas or vapour may cause lung oedema (see Notes). The substance may cause hypocalcemia. Exposure above the OEL may result in death. The effects may be delayed. Medical observation is indicated.

EFFECTS OF LONG-TERM OR REPEATED EXPOSURE:
The substance may cause fluorosis.
PHYSICAL PROPERTIES
Boiling point: 20C
Melting point: -83C
Relative density (water = 1): 1.0 as liquid at 4C
Solubility in water: very good
Vapour pressure, kPa at 25C: 122
Relative vapour density (air = 1): 0.7
ENVIRONMENTAL DATA

NOTES
The occupational exposure limit value should not be exceeded during any part of the working exposure. The symptoms of lung oedema often do not become manifest until a few hours have passed and they are aggravated by physical effort. Rest and medical observation are therefore essential. Immediate administration of an appropriate inhalation therapy by a doctor or a person authorized by him/her, should be considered. Turn leaking cylinder with the leak up to prevent escape of gas in liquid state. Depending on the degree of exposure, periodic medical examination is suggested. UN number for hydrogen fluoride in aqueous solution: 1790, hazard class 8, subsidiary hazard 6.1, pack group I (>60%). Card has been partly updated in April 2005. See sections Occupational Exposure Limits, Emergency Response.
ADDITIONAL INFORMATION


LEGAL NOTICE Neither the CEC nor the IPCS nor any person acting on behalf of the CEC or the IPCS is responsible for the use which might be made of this information
IPCS, CEC 2005
See Also:
        Hydrogen fluoride (CHEMINFO)
        Hydrogen fluoride (PIM 268)