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To: CH4 who wrote (5468)	9/24/2001 6:43:08 PM
From: trouthead	Read Replies (1) \| Respond to of 5827

You didn't really answer my question. Thanks for trying. If you can point me to an article about the problem I would appreciate it. And would prefer if you did it publicly. Thanks, jb

To: CH4 who wrote (5468)	9/24/2001 11:45:57 PM
From: CH4	Read Replies (2) \| Respond to of 5827

Material Safety Data Sheet for Hydrogen (H2) excerpts ... Section 3: Hazards Identification (return to contents) Emergency Overview Hydrogen is a colorless gas with no odor. It is not toxic; the immediate health hazard is that it may cause thermal burns. It is flammable and may form mixtures with air that are flammable or explosive. Hydrogen may react violently if combined with oxidizers, such as air, oxygen, and halogens. Hydrogen is an asphyxiant and may displace oxygen in a workplace atmosphere. The concentrations at which flammable or explosive mixtures form are much lower than the concentration at which asphyxiation risk is significant. Section 5: Fire Fighting Measures (return to contents) Flammability and Explosivity Flash Point: Not applicable, this material is a gas. Flammability Limits in Air: 4.0% to 75.0%. Autoignition Temperature: 500 deg. C (932 deg. F). Flammability Classification (per 29 CFR 1910.1200): Flammable gas. Known or Anticipated Hazardous Products of Combustion: None. Properties that may Initiate or Intensify Fire: Heating cylinder to the point of activation of the pressure relief device. Reactions that Release Flammable Gases: None known to Voltaix, Inc. Extinguishing Media None Fire Fighting Instructions The only safe way to extinguish a flammable gas fire is to stop the flow of gas. If the flow cannot be stopped, allow the entire contents of the cylinder to burn. Cool the cylinder and surroundings with water from a suitable distance. Extinguishing the fire without stopping the flow of gas may permit the formation of ignitable or explosive mixtures with air. These mixtures may propagate to a source of ignition. Excessive pressure may develop in gas cylinders exposed to fire, which may result in explosion, regardless of the cylinder's content. Cylinders with pressure relief devices (PRD's) may release their contents through such devices if the cylinder is exposed to fire. Cylinders without PRD's have no provision for controlled release and are therefore more likely to explode if exposed to fire. Positive pressure, self-contained breathing apparatus is required for all fire fighting involving hazardous materials. Full structural fire fighting (bunker) gear is the minimum acceptable attire. The need for proximity, entry, and flashover protection and special protective clothing should be determined for each incident by a competent fire fighting safety professional. Section 6: Accidental Release Measures (return to contents) Containment As hydrogen is a gas at atmospheric conditions, the only means of containment is the enclosure of the space into which it is released. Containment is described in Section 7. Clean Up Clean up consists of passing the entire gas volume of the enclosure through appropriate exhaust gas treatment equipment (EGTE). Purge the enclosure with a non-reactive gas, such as nitrogen, through the EGTE until an acceptably low level of contamination remains. The primary consideration is flammability. Evacuation If the release is not contained in an appropriate device or system, all personnel not appropriately protected (see Section 8) must evacuate the contaminated spaces. Consider evacuation of additional areas, as a precaution against the spread of the release or subsequent explosion or fire. Special Instructions None. Section 7: Handling and Storage (return to contents) Handling Handle this material only in sealed, purged systems. The design of handling systems for hazardous materials is beyond the scope of this MSDS, and should be performed by a competent, experienced professional. Consider the use of doubly-contained piping; diaphragm or bellows sealed, soft seat valves; backflow prevention devices; flash arrestors; and flow monitoring or limiting devices. Gas cabinets, with appropriate exhaust treatment, are recommended, as is automatic monitoring of the secondary enclosures and work areas for release. Handle sealed gas cylinders in accordance with CGA P-1, Safe Handling of Compressed Gases in Containers. Some material may have accumulated behind the outlet plug. Face the outlet away from you and wear appropriate protective equipment when removing the plug to connect the cylinder to your system. Never introduce any substance into a gas cylinder. If you believe your cylinder may have been contaminated, notify Voltaix, Inc. immediately. Provide as much information as possible on the nature and quantity of contamination. Storage Store cylinders in accordance with CGA P-1, Safe Handling of Compressed Gases in Containers, local building and fire codes and other relevant regulations. Materials should be segregated by the hazards they comprise for storage. Protect the cylinders from direct sunlight, precipitation, mechanical damage, and temperatures above 55oC (130oF). Ship and store cylinders with the outlet plug and valve protective cap in place. Section 10: Stability and Reactivity (return to contents)Contents Chemical Stability: Hydrogen is stable. Conditions to Avoid: Sources of ignition, exposure to air. Incompatibility with Other Materials: Oxidizers, including air, oxygen and halogens. Hazardous Decomposition, Reaction and Oxidation (other than burning) Products: None. Hazardous Polymerization: Has not been observed. voltaix.com ... complete material safety data sheet for pure Hydrogen point of interest: electricity is a source of ignition, comparison of the range of flammability limits in air 4.0% to 75.0% for pure Hydrogen to: natural gas Flammability Limits in Air: Depends on concentration and diluent. The flammable range of methane is 5.3% to 15%. The other components are nonflammable. voltaix.com ... Material Safety Data Sheet for Flammable Methane Mixtures (CH4)