International Chemical Safety Cards HYDROGEN FLUORIDE ICSC: 0283 Hydrofluoric acid, anhydrous HF Molecular mass: 20.0 (cylinder) ICSC #    0283 CAS #     7664-39-3 RTECS # MW7875000 UN #        1052 EC #         009-002-00-6 April 12, 2000 Peer reviewed 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 STORAGE 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. Fireproof. Separated from food and feedstuffs . See Chemical Dangers. Cool. Keep in a well-ventilated room. Do not transport with food and feedstuffs. T+ symbol C symbol R: 26/27/28-35 S: 1/2-7/9-26-36/37/39-45 UN Hazard Class: 8 UN Subsidiary Risks: 6.1 UN Packing Group: I SEE IMPORTANT INFORMATION ON BACK ICSC: 0283 Prepared in the context of cooperation between the International Programme on Chemical Safety & the Commission of the European Communities (C) IPCS CEC 1994. No modifications to the International version have been made except to add the OSHA PELs, NIOSH RELs and NIOSH IDLH values.

International Chemical Safety Cards HYDROGEN FLUORIDE ICSC: 0283 I M P O R T A N T D A T A PHYSICAL STATE; APPEARANCE: COLOURLESS GAS OR COLOURLESS FUMING LIQUID , WITH PUNGENT ODOUR. PHYSICAL DANGERS: 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) 3 ppm (Ceiling value); BEI issued; (ACGIH 2004). MAK: 2 ppm, 1.7 mg/m³; Peak limitation category: I(1); Pregnancy risk group: C; MAK: BAT 7 mg/g creatinine; (DFG 2004). OSHA PEL: TWA 3 ppm NIOSH REL: TWA 3 ppm (2.5 mg/m3) C 6 ppm (5 mg/m3) 15-minute NIOSH IDLH: 30 ppm 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: 20°C Melting point: -83°C Relative density (water = 1): 1.0 as liquid at 4°C Solubility in water: very good Vapour pressure, kPa at 25°C: 122 Relative vapour density (air = 1): 0.7 ENVIRONMENTAL DATA N O T E S 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. Transport Emergency Card: TEC (R)-80S1052 or 80GCT1-I NFPA Code: H 3; F 0; R 2; ADDITIONAL INFORMATION ICSC: 0283 HYDROGEN FLUORIDE (C) IPCS, CEC, 1994

IMPORTANT LEGAL NOTICE: Neither NIOSH, the CEC or the IPCS nor any person acting on behalf of NIOSH, the CEC or the IPCS is responsible for the use which might be made of this information. This card contains the collective views of the IPCS Peer Review Committee and may not reflect in all cases all the detailed requirements included in national legislation on the subject. The user should verify compliance of the cards with the relevant legislation in the country of use. The only modifications made to produce the U.S. version is inclusion of the OSHA PELs, NIOSH RELs and NIOSH IDLH values.