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�PRAXAIR Praxair Material Safety Data Sheet <br /> 6/ukin�nta•plrutet mwt ptrxkrc7ive" <br /> Product: Hydrogen, Compressed SDS No. P-4604-H <br /> March 2012 <br /> NOTES TO PHYSICIAN: There is no specific antidote. Treatment of overexposure should be <br /> directed at the control of symptoms and the clinical condition of the patient. <br /> 5. Fire Fighting Measures <br /> FLAMMABLE PROPERTIES: Flammable gas. Flame is nearly invisible. Escaping gas may <br /> ignite spontaneously. Hydrogen has a low ignition energy. Fireball forms if gas cloud ignites <br /> immediately after release. Forms explosive mixtures with air and oxidizing agents. <br /> SUITABLE EXTINGUISHING MEDIA: CO2, dry chemical, water spray, or fog <br /> PRODUCTS OF COMBUSTION: Water (H2O) <br /> PROTECTION OF FIREFIGHTERS: DANGER! Flammable high-pressure gas. Evacuate all <br /> personnel from danger area. Immediately deluge cylinders with water from maximum distance <br /> until cool; then move them away from fire area if without risk. Continue cooling water spray <br /> while moving cylinders. Do not extinguish flames emitted from cylinders; allow them to burn out. <br /> If flames are accidentally extinguished, explosive re-ignition may occur. All personnel including, <br /> fire and rescue workers, should leave the area immediately. Self-contained breathing apparatus <br /> may be required by rescue workers. On-site fire brigades must comply with OSHA 29 CFR <br /> 1910.156 and applicable standards under 29 CFR 1910 Subpart L—Fire Protection. <br /> Specific Physical and Chemical Hazards. Heat of fire can build pressure in cylinder and <br /> cause it to rupture. Hydrogen cylinders are equipped with a pressure relief device. (Exceptions <br /> may exist where authorized by DOT.) No part of a cylinder should be subjected to a <br /> temperature higher than 125°F (520C). If venting or leaking hydrogen catches fire, do not <br /> extinguish flames. Flammable gas may spread from leak, creating an explosive re-ignition <br /> hazard. Vapors can be ignited by pilot lights, other flames, smoking, sparks, heaters, electrical <br /> equipment, static discharge, or other ignition sources at locations distant from product handling <br /> point. Explosive atmospheres may linger. Before entering area, especially confined areas, <br /> check atmosphere with approved explosion meter. <br /> Protective Equipment and Precautions for Firefighters. Firefighters should wear self- <br /> contained breathing apparatus and full fire-fighting turnout gear. <br /> 6. Accidental Release Measures <br /> STEPS TO BE TAKEN IF MATERIAL IS RELEASED OR SPILLED: <br /> DANGER! Flammable high-pressure gas. <br /> Personal Precautions. Forms explosive mixtures with air. (See section 5.) Immediately <br /> evacuate all personnel from danger area. Use self-contained breathing apparatus where <br /> needed. Approach suspected leak area with caution. Remove all sources of ignition if without <br /> risk. Reduce gas with fog or fine water spray. Shut off flow if without risk. Ventilate area or <br /> move cylinder to a well-ventilated area. Flammable gas may spread from leak. Before entering <br /> area, especially confined areas, check atmosphere with an appropriate device. <br /> Copyright 1980, 1986, 1992, 1997, 2000, 2004, 2007, 2012, <br /> Praxair Technology, Inc. All rights reserved. Page 3 of 10 <br /> FA vertical line in the left margin indicates revised or new material. <br />