Page 141 - School Infection Control Handbook - 2010

Appendix B: Selection of Products, Dispensing Equipment, and Application Systems
136
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
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
Instability – NFPA rating only (Reactivity – former rating)
4 Can explode at normal temperatures and pressures
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