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EC number: 201-186-8 | CAS number: 79-21-0
Most of the peracetic acid equilibrium grades ranging from 5% to 15% exhibit closed-cup flash points but no measurable open-cup flash points (ECETOC; 2001). Thus, these grades are not flammable under conditions where the liquid is open to the atmosphere. However, a sustained flame is possible in a closed system. Decomposition of peracetic acid produces oxygen. A closed system prevents the release of the oxygen, which in the presence of the organic (acetic acid) can sustain a flame. Thus, all the gases produced remain in the system and they can burn. Equilibrium grades of concentrations 30% peracetic acid or higher exhibit both open and closed-cup flash points and are flammable.
The available data on flammability of peracetic acid meet the criteria for classification as Flam. Liquid 3. according to Regulation (EC) 1272/2008
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