|HYDROGEN FLUORIDE||ICSC: 0283 (April 2017)|
|Hydrofluoric acid, anhydrous|
| CAS #: 7664-39-3
| UN #: 1052
|EC Number: 231-634-8
|ACUTE HAZARDS||PREVENTION||FIRE FIGHTING|
|FIRE & EXPLOSION||Not combustible. Many reactions may cause fire or explosion. Risk of fire and explosion on contact with incompatible substances. See Chemical Dangers.||NO contact with incompatible substances. See Chemical Dangers.||In case of fire in the surroundings, use appropriate extinguishing media. In case of fire: keep cylinder cool by spraying with water. Combat fire from a sheltered position.|
|AVOID ALL CONTACT! IN ALL CASES CONSULT A DOCTOR! See Notes.|
|Inhalation||Burning sensation. Sore throat. Cough. Laboured breathing. Shortness of breath. Nausea. Vomiting. Symptoms may be delayed. See Notes.||Use ventilation, local exhaust or breathing protection.||Fresh air, rest. Half-upright position. Artificial respiration may be needed. Refer immediately for medical attention.|
|Skin||MAY BE ABSORBED! Redness. Pain. Serious skin burns. Blisters. See Inhalation.||Protective gloves. Protective clothing. Apron.||Wear protective gloves when administering first aid. Remove contaminated clothes. Rinse skin with plenty of water or shower. Refer immediately for medical attention.|
|Eyes||Redness. Pain. Severe burns.||Wear face shield or eye protection in combination with breathing protection.||Rinse with plenty of water (remove contact lenses if easily possible). Refer immediately for medical attention.|
|Ingestion||Burns in mouth and throat. Burning sensation. Abdominal pain. Vomiting. Shock or collapse.||Do not eat, drink, or smoke during work. Wash hands before eating.||Rinse mouth. Give nothing to drink. Do NOT induce vomiting. Refer immediately for medical attention.|
|SPILLAGE DISPOSAL||CLASSIFICATION & LABELLING|
|Evacuate danger area! Consult an expert! Personal protection: gas-tight chemical protection suit including self-contained breathing apparatus. Do NOT let this chemical enter the environment. Ventilation. Remove vapour with fine water spray.||
According to UN GHS Criteria
DANGERFatal if swallowed or if inhaled
Causes severe skin burns and eye damage
May cause respiratory irritation
Causes damage to the bones through prolonged or repeated exposure
Harmful to aquatic life
|Cool. Well closed. Fireproof if in building. Ventilation along the floor. Separated from food and feedstuffs and incompatible materials. Store in an area without drain or sewer access. See Chemical Dangers.|
|Do not transport with food and feedstuffs.|
|HYDROGEN FLUORIDE||ICSC: 0283|
|PHYSICAL & CHEMICAL INFORMATION|
Physical State; Appearance
|EXPOSURE & HEALTH EFFECTS|
Routes of exposure
Effects of short-term exposure
Effects of long-term or repeated exposure
|OCCUPATIONAL EXPOSURE LIMITS|
TLV: (as F): 0.5 ppm as TWA; 2 ppm as STEL; (skin); BEI issued.
MAK: (as F): 0.83 mg/m3, 1 ppm; peak limitation category: I(2); pregnancy risk group: C.
EU-OEL: 1.5 mg/m3 as TWA; 2.5 mg/m3 as STEL
|The substance is harmful to aquatic organisms.|
|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.
Specific treatment is necessary in case of poisoning with this substance; the appropriate means with instructions must be available.
Isolate contaminated clothing by sealing in a bag or other container.
Turn leaking cylinder with the leak up to prevent escape of gas in liquid state.
UN number for hydrogen fluoride in aqueous solution: 1790, hazard class 8, subsidiary hazard 6.1, pack group I (>60%).
See ICSC 1777.
There is an association of anhydrous hydrogen fluoride molecules in the vapour and liquid states at normal room temperatures and pressures. The degree of association is dependent on the temperature. Therefore physical constants such as vapour density vary with temperature from 2.6 at 20 °C to 0.7 at 65 °C.
Symbol: T+, C; R: 26/27/28-35; S: (1/2)-7/9-26-36/37/39-45
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