Safety Manual - Spms

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SCHOOL OF PHYSICAL & MATHEMATICAL SCIENCES LABORATORY SAFETY MANUAL Consult and follow the recommendations contained is SDS for specific precautions; Wear appropriate PPE, gloves, dust mask as recommended on SDS; Keep minimum contact. 9.4.12 Pyrophoric Substances A pyrophoric substance is one that will ignite spontaneously upon exposure to oxygen, moisture or both. These materials must be stored in inert gas atmosphere or under kerosene. Extreme Pyrophoric liquids include: t- butyllithium, sec- butyllithium, borane. THF, diethylzinc, neat Trialkyl aluminums (e.g. Me 3 Al) and other substances of comparable properties. Pyrophoric liquids include: Alkylaluminums in solution, n-butyllithium, diisobutylaluminum hydride (DIBAL-H), Grignard reagents and other substances of comparable properties. Pyrophoric solids include: Alkali metals (Na, K, Rb, Cs), metal hydrides (KH, NaH, LiAlH 4 , CaH 2 ), Raney nickel and other substances of comparable properties. When Handling Pyrophoric Reagents: Appropriate PPE must be worn; COLLEGE OF SCIENCE 47
SCHOOL OF PHYSICAL & MATHEMATICAL SCIENCES LABORATORY SAFETY MANUAL A Class D fire extinguisher must be placed at a nearby location before the use of pyrophoric reagents begins; Your lab mates must be informed of what you are working with and you must review emergency procedures with them in the event of a spill or a fire; All work with pyrophoric materials should take place in fume hood or glove box; All reagent bottles and reaction flasks must be firmly clamped in place so that there is no chance of them being knocked over. 9.4.13 Organic Peroxide Introduction An organic peroxide is any organic (carbon-containing) compound having two oxygen atoms joined together (-O-O-). This chemical group is called a "peroxy" group which is chemically unstable. It can easily decompose, give off heat at a rate that increase as temperature increases. Many organic peroxides, when decompose, give off flammable vapor which can catch fire easily. They are hazardous due to their extreme sensitivity to shock, sparks or other forms of mild ignition. They are also sensitive to heat, friction, impact and light as well as to strong oxidizing and reducing agents. Ethers such as THF, ethyl ether, diisopropyl ether (not containing stabilizers or inhibitors of auto oxidation) can generate high concentrations of peroxides within a short period of time when exposed to air. Diisopropyl ether forms a bis-peroxide crystalline that explodes with deadly force. COLLEGE OF SCIENCE 48
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Safety Manual - Spms

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