Material hazards hydrogen

Hazard Toxic by inhalation strong irritant to eyes and skin causes severe bums. Can ignite combustible materials. Evolves hydrogen on contact with most metals. 

EXPLOSION and FIRE CONCERNS not flammable non-combustible solid NFPA rating Health 3 Flammability 0 Reactivity 0 incompatible with acids, alkalies, oxidizing mate-nals, and other organic materials hazardous decomposition products include hydrogen chloride, chlorinated phenols, and carbon monoxide use water spray, carbon dioxide, dry chemical powder, or foam for firefighting purposes. 

Hazardous Materials. Hazardous chemicals are, of course, a feature of many chemical plants. Materials used in quantity in the uranium industry include hydrogen, hydrofluoric acid, elementary fluorine, pressurized hydrocarbon oils at elevated temperatures, and uranium which is itself fairly highly toxic. Satisfectory safe techniques for the storage, handling, and containment of these materials, some of which are used at elevated temperatures, have been essential precursors to the development of acceptable processes. 

Toxicology LD50 (oral, mouse) 971 mg/kg, (IP, mouse) 400 mg/kg high toxicity absorbed by skin poison by IP and subcut. routes mod. toxic by ing., inh., skin contact skin irritant TSCAlisted Precaution Combustible DOT poisonous material Hazardous Decomp. Prods. CO, CO NO, hydrogen cyanide heated to decomp., emits toxic fumes of CN" and NO,... 

While it is hazardous, hydrogen peroxide is a successful product of commerce, and there are techniques for coping with the hazards [227]. Many of the safety practices reconunended for peroxide apply to other hazardous materials as well. These recommendations are more emphatic than usual in the case of hydrogen peroxide and extend to greater involvement of the material supplier [228]. It is always advisable to obtain... 

Principle 3—less hamrdcms chemical syntheses The reduction reaction uses essentially nontoxic starting materials and avoids the use of potentially hazardous hydrogen and heavy metal catalysts obviating concern for their removal from waste streams and/or contaminahon of the product. While cyanide must be used in the second step, as in all practical routes to the product, it is used more efficiently (higher yield) and under less harsh conditions compared to previous processes. 

Precaution Incompat. with strong oxidizers not flamm. or combustible under fire conditions, may support combustion and dec. to emit toxic materials Hazardous Decomp. Prods. Thennal decomp, prods. CO, NO, hydrogen chloride... 

Chemical Hazards. Chemical manufacturers and employees contend with various ha2ards inherent ia productioa of evea commonplace materials. For example, some catalysts used ia the manufacture of polyethylene (see Olefin polymers) ignite when exposed to air or explode if allowed to become too warm the basic ingredient ia fluorocarboa polymers, eg, Tefloa (see Fluorine compounds, organic), can become violently self-reactive if overheated or contaminated with caustic substances (45,46) one of the raw materials for the manufacture of acryflc fibers (see Fibers, acrylic) is the highly toxic hydrogen cyanide (see Cyanides). 

Elemental tellurium and the stable teUurides of heavy nonferrous metals are relatively inert and do not represent a significant health hazard (43—47). Other, more reactive teUurides, including soluble and volatile teUurium compounds such as hydrogen teUuride [7783-09-7] teUurium hexafluoride [7783-80-4] and alkyl teUurides, should be handled with caution. Some of these materials can enter the body by absorption through the skin or by inhalation and ingestion of dust or fumes. No serious consequences or deaths have been reported in workers exposed to teUurium and its compounds in industry (48). 

Fire Hazard. Although chlorosulfuric acid itself is not dammable, it may cause ignition by contact with combustible materials because of the heat of reaction. Open fires, open lights, and matches should not be used in or around tanks or containers where hydrogen gas may be collected because of the action of chlorosulfuric acid on metals. Water, carbon dioxide, and dry-chemical fire extinguishers should be kept readily available. 

Acryhc elastomers are normally stable and not reactive with water. The material must be preheated before ignition can occur, and fire conditions offer no hazard beyond that of ordinary combustible material (56). Above 300°C these elastomers may pyrolize to release ethyl acrylate and other alkyl acrylates. Otherwise, thermal decomposition or combustion may produce carbon monoxide, carbon dioxide, and hydrogen chloride, and/or other chloiinated compounds if chlorine containing monomers are present ia the polymer. 

Transparent (Invisible) Flames Some materials have nearly nonluminous flames, which may not be visible, especially in the daytime. For example, hydrogen has a nearly nonvisible flame in the daytime. A person may walk unaware into a hydrogen leak flame. Some other materials, including some alcohols such as methanol, also have nearly nonluminous flames and may be unusually hazardous because the flames cannot be seen in the daytime. 

Chemical Reactivity - Reactivity with Water Reacts slowly to generate hydrogen chloride (hydrochloric acid). The reaction is not hazardous Reactivity with Common Materials Corrodes metal slowly Stability During Transport Stable Neutralizing Agents for Acids and Caustics Flush with water, rinse with sodium bicarbonate or lime solution Polymerization Not pertinent Inhibitor of Polymerization Not pertinent. 

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