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| Product Name: | Hydrogen, Compressed |
| Chemical Name: | Hydrogen |
| Formula: | H2 | 4 |
| Chemical Family: | Flammable gas | 0 | 0 |
| Use: | Various | SA |
| Synonyms: | None |
| ¨ ¨ |
| NFPA Fire: | 4 | HMIS Fire: | 4 | Acute: | No |
| NFPA Health: | 0 | HMIS Health: | 0 | Chronic: | No |
| NFPA Reactivity: | 0 | HMIS Reactivity: | 0 | Fire: | Yes |
| NFPA Special Hazard: | SA | Mixture: | No | Reactive: | No |
| Sudden Release Pressure: | Yes |
| 02. INGREDIENTS - COMPOSITION & INFORMATION |
| PERCENT | EXPOSURE GUIDELINES |
| COMPONENT | CAS No. | (BY WT.) | OSHA - TWA | ACGIH - STEL |
| Hydrogen | 1333-74-0 | 99.0% | 100.0% | None. | Simple Asphyxiant |
| LD50: None. LC50: None. |
| 03. HAZARDS IDENTIFICATION |
| EMERGENCY OVERVIEW: |
| Danger: | Flammable, High Pressure Gas |
| Can form explosive mixtures with air |
| Burns with an invisible flame. |
| Potential Health Effects Information: |
| Routes of Exposure: |
| Inhalation: | Asphyxiant. It should be noted that before suffocation could occur, the lower |
| flammability limit of hydrogen in air would be exceeded; possibly causing both an |
| explosive and oxygen-deficient atmosphere. Exposure to moderate concentrations |
| may cause dizziness, headache, nausea and unconsciousness. Exposure to |
| atmospheres containing 8-10% or less oxygen will bring about unconsciousness |
| without warning, and so quickly that the individuals cannot help or protect |
| themselves. Lack of sufficient oxygen may cause serious injury or death. |
| Eye: | None. |
| Skin: | None. |
| Ingestion: | None. |
| Medical Conditions Aggravated By | None. |
| Overexposure: |
| Chronic Effects: | None |
| Carcinogenicity: | Not listed in NTP, OSHA or IARC |
| 04. FIRST AID MEASURES |
| Inhalation: | Remove to fresh air. If not breathing, give artificial respiration. If breathing is |
| difficult, give oxygen. Get immediate medical attention. |
| Eye: | None. |
| Skin: | None. |
| Ingestion: | None. |
| Notes To Physician: | None. |
| 05. FIRE FIGHTING MEASURES |
| Flash Point: | Flammable gas. |
| Autoignition: | 565.5°C (1050°F) |
| Flammable Limits - Lower: | 4% |
| Flammable Limits - Upper: | 74% |
| Extinguishing Media: | CO2, dry chemical, water spray or fog for surrounding area. Do not extinguish until |
| hydrogen source is shut off. |
| Fire Fighting Instructions: | Evacuate all personnel from danger area. Immediately cool container with water |
| spray from maximum distance, taking care not to extinguish flames. If flames are |
| accidentally extinguished, explosive re-ignition may occur. Stop flow of gas if |
| without risk while continuing cooling water spray. |
| Fire And Explosion Hazards: | Burns with a pale blue, nearly invisible flame. Hydrogen is easily ignited with low |
| ignition energy. Hydrogen is lighter than air and can accumulate in the upper |
| sections of enclosed spaces. Pressure in a container can build up due to heat; and it |
| may rupture if pressure relief devices should fail to function. |
| Hazardous Combustion Products: | None. |
| Sensitivity To Mechanical Impact: | None. |
| Hazardous Combustion Products: | None. |
| Sensitivity To Static Discharge: | Ignitable by static electricity |
| 06. ACCIDENTAL RELEASE MEASURES |
| Evacuate: | Evacuate immediate area. Eliminate any possible sources of ignition, and provide |
| maximum explosion-proof ventilation. Shut off source of hydrogen, if possible. If |
| leaking from cylinder, or valve, contact your supplier. The presence of a hydrogen |
| flame can be detected by approaching cautiously with an outstretched straw broom |
| to make the flame visible. Never enter a confined space or other area where the |
| concentration is greater than 10% of the lower flammable limit which is 0.4%. |
| 07. HANDLING AND STORAGE |
| Storage: | Specific requirements are listed in NFPA 50A. Cylinder storage locations should be |
| well-protected, well-ventilated, dry, and separated from combustible materials. |
| Cylinders should never knowingly be allowed to reach a temperature exceeding |
| 125°F (52°C). Cylinders of hydrogen should be separated from oxygen cylinders or |
| other oxidizers by a minimum distance of 20 ft., or by a barrier of non-combustible |
| material at least 5 ft. high having a fire resistance rating of at least ½ hour. Full and |
| empty cylinders should be segregated. Use a first-in, first-out inventory system to |
| prevent full containers from being stored for long periods of time. |
| Cylinders should be stored upright with valve protection cap in place and firmly |
| secured to prevent falling or being knocked over. Protect cylinders from physical |
| damage; do not drag, roll, slide or drop. Use a suitable hand truck for cylinder |
| movement. Post "No Smoking or Open Flames" signs in the storage areas. There |
| should be no sources of ignition. All electrical equipment should be explosion proof |
| in the storage and use areas. Storage areas must meet national electric codes for |
| class 1 hazardous areas. |
| Handling: | Do not "crack" hydrogen cylinder valve before connecting it, since self-ignition may |
| occur. Hydrogen is the lightest gas known and may collect in the top of buildings |
| with out proper ventilation. It may leak out of a system which is gas-tight for air or |
| other gases. Leak check system with leak detection solution, never with flame. If |
| user experiences difficulty operating cylinder valve, discontinue use and contact |
| supplier. Never insert an object (e.g., wrench, screwdriver, pry bar, etc.) into valve |
| cap openings. Doing so may damage valve, causing a leak to occur. Use an |
| adjustable strap wrench to remove over-tight or rusted caps. Never strike an arc on |
| a compressed gas cylinder or make a cylinder a part of an electrical circuit. |
| Non-sparking tools should be used. For additional precautions in using hydrogen see |
| Section 16 - Other Information. |
| 08. EXPOSURE CONTROLS - PERSONAL PROTECTION |
| Engineering Controls: |
| Ventilation: | Provide adequate natural or explosion-proof mechanical ventilation to ensure |
| hydrogen does not reach its lower explosive limit of 4% |
| Personal Protective Equipment (PPE): |
| Skin Protection: |
| Glasses: | Safety glasses are recommended when handling cylinders. |
| Shoes: | Safety shoes are recommended when handling cylinders. |
| Clothing: | Cotton clothing is recommended for use to prevent static buildup. |
| Gloves: | Work gloves are recommended when handling cylinders. |
| Respiratory Protection: |
| General Use: | None. |
| Emergency Use: | Air supplied respirators are required in oxygen-deficient atmospheres, air purifying |
| respirators will not function. Before entering area you must check for flammable or |
| oxygen-deficient atmospheres. |
| 09. PHYSICAL AND CHEMICAL PROPERTIES |
| Physical State: | Gas |
| Color: | Colorless gas. |
| Odor: | Odorless |
| Molecular Weight: | 2.016 |
| Boiling Point: | -423.0°F (-252.8°C) @ 1 atm |
| Specific Gravity: | .0696 At 32°F (0°C) @ 1 atm, Air = 1 |
| Freezing/Melting Point: | -434.55°F (-259.2°C), @ 1 atm |
| Vapor Pressure: | Not Applicable |
| Vapor Density: | .00521 lb./cu ft (0.08342 kg/CuM), At 70°F (21.1°C) @ 1 atm |
| Water Solubility: | .019 Vol./Vol at 60°F (15.6°C) |
| Expansion Ratio: | Not Applicable - Gas |
| pH: | Not Applicable - Gas |
| Odor Threshold: | Not Applicable (odorless) |
| Evaporation Rate: | Not Applicable - Gas |
| Coefficient Of Water/Oil Distribution: | Information not available |
| 10. STABILITY AND REACTIVITY |
| Chemical Stability: | Stable |
| Conditions To Avoid: | None. |
| Incompatibility With Other Materials: | Oxidizing agents. Some steels are susceptible to hydrogen embrittlement at high |
| pressures and temperatures |
| Hazardous Decomposition Products: | None |
| Hazardous Polymerization: | Will not occur |
| 11. TOXICOLOGICAL INFORMATION |
| Irritancy Of Material: | None. |
| Reproductive Effects: | None. |
| Teratogenicity: | None. |
| Synergistic Materials: | None. |
| Sensitization To Material: | None. |
| Mutagenicity: | None. |
| 12. ECOLOGICAL INFORMATION |
| Ecotoxicity: | No adverse ecological effects are expected. Hydrogen does not contain any Class I |
| or Class II Ozone depleting chemicals (40 CFR Part 82). Hydrogen is not listed as |
| a marine pollutant by DOT (49 CFR Part 171). |
| 13. DISPOSAL CONSIDERATIONS |
| Waste Disposal Method: | Do not attempt to dispose of residual or unused quantities. Return cylinder to |
| supplier. |
| Residual product within process system may be vented at a controlled rate, to the |
| atmosphere through a vent stack that discharges to an elevated point. This vent |
| stack should be in an isolated area away from ignition sources. |
| 14. TRANSPORT INFORMATION |
| DOT/IMO Shipping Name: | Hydrogen, compressed. |
| Hazard Class: | 2.1 (Flammable gas.) |
| Identification Number: | UN1049 |
| PIN: | 1049 |
| Product RQ: | None. |
| Shipping Label: | Flammable Gas. |
| Special Shipping Information: | Cylinders should be transported in a secure position, in a well ventilated vehicle. |
| The transportation of compressed gas cylinders in automobiles or in closed-body |
| vehicles can present serious hazards and should be discouraged. |
| Placard (When Required): | Flammable gas. |
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