School Infection Control Handbook - 2010

Appendix B: Selection of Products, Dispensing Equipment, and Application Systems

Physical Hazard – HMIS rating only 4 Readily capable of explosive water reaction, detonation, explosive decomposition, polymerization, or self-reaction at normal temperature and pressure 3 May form explosive mixtures with water; capable of detonation or explosive reaction in the presence of a strong initiating source; may polymerize, decompose, self-react, or undergo other chemical change at normal temperature and pressure, with moderate risk of explosion 2 Unstable; may undergo violent chemical changes at normal temperature and pressure, with low risk for explosion; may react violently with water or form peroxides when exposed to air 1 Normally stable but can become unstable (self-react) at high temperatures and pressures; may react nonviolently with water or undergo hazardous polymerization in the absence of inhibitors 0 Normally stable, even under fire conditions; will NOT react with water, polymerize, decompose, condense, or self-react; nonexplosive 3 Can explode under shock and heat, or react explosively with water 2 Normally unstable; can undergo violent change or react violently with water 1 Normally stable but can become unstable when heated or under pressure 0 Normally stable Instability – NFPA rating only (Reactivity – former rating) 4 Can explode at normal temperatures and pressures

Instability

Health Flammability Physical Hazard PPE Seven physical hazard classes are recognized: x Water reactives x Organic peroxides x Explosives x Compressed gases x Pyrophoric materials x Oxidizers x Unstable reactives

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