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-IMPRAXAIR Praxair Material Safety Data Sheet l faking our planet more pmductive" Product: Hydrogen, Compressed SIDS No. P-4604-H March 2012 POTENTIAL HEALTH EFFECTS: Effects of a Single (Acute) Overexposure Inhalation. Asphyxiant. Effects are due to lack of oxygen. Moderate concentrations may cause headache, drowsiness, dizziness, excitation, excess salivation, vomiting, and unconsciousness. Lack of oxygen can kill. Skin Contact. No harm expected. Swallowing. An unlikely route of exposure; this product is a gas at normal temperature and pressure. Eye Contact. No harm expected. Effects of Repeated (Chronic) Overexposure. No harm expected. Other Effects of Overexposure. Hydrogen is an asphyxiant. Lack of oxygen can kill. Medical Conditions Aggravated by Overexposure. The toxicology and the physical and chemical properties of hydrogen suggest that overexposure is unlikely to aggravate existing medical conditions. CARCINOGENICITY: This product is not listed by NTP, OSHA, or IARC POTENTIAL ENVIRONMENTAL EFFECTS: None known. For further information, see section 12, Ecological Information. 3. Composition/Information on Ingredients See section 16 for important information about mixtures. COMPONENT CAS NUMBER CONCENTRATION Hydrogen 1333-74-0 >99%* * The symbol> means "greater than." 4. First Aid Measures INHALATION: Remove to fresh air. If not breathing, give artificial respiration. If breathing is difficult, qualified personnel may give oxygen. Call a physician. SKIN CONTACT: An unlikely route of exposure. This product is a gas at normal temperature and pressure. SWALLOWING: An unlikely route of exposure. This product is a gas at normal temperature and pressure. EYE CONTACT: An unlikely route of exposure. This product is a gas at normal temperature and pressure. Copyright 1980, 1986, 1992, 1997, 2000, 2004, 2007, 2012, Praxair Technology, Inc. All rights reserved. Page 2 of 10 FA vertical line in the left margin indicates revised or new material.