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Flash point

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Reference
Endpoint:
flash point of flammable liquids
Type of information:
experimental study
Adequacy of study:
key study
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: Peer reviewed data
Qualifier:
equivalent or similar to guideline
Guideline:
EU Method A.9 (Flash-Point)
Deviations:
not specified
GLP compliance:
no
Type of method:
closed cup
Remarks:
and open cup
Key result
Flash point:
> 68 - < 83 °C
Remarks on result:
other: see Remarks
Remarks:
Reference values of 5%PAA solutions range from 74 to 83°C, those of 15% PAA solutions were between 68 and 81°C.

A comparison of safety data sheets from different producers showed considerable scatter in measured flashpoints: The closed-cup flash points of 5%PAA solutions ranged from 74 to 83°C, those of 15% PAA solutions were between 68 and 81°C and those of 35% PAA solutions were between 46 and 62 °C. This may be due to factors such as PAA reacting with the sample container used in the test, thermal instability of the tested solution, loss of volatile material during analysis due to decomposition and excessive gassing, releasing oxygen and water which tends to extinguish any flame.

Most of the PAA equilibrium solutions ranging from 5% to 15% PAA exhibited closed-cup flash points but no measurable open-cup flash points. However, a sustained flame is possible in a closed system. Decomposition of PAA produces oxygen. A closed system prevents the release of oxygen, which on 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% PAA or higher exhibit both open and closed-cup flash points and vapours can be flammable.

Conclusions:
The flash point is normally determined for each commercial product. Reference values of 5% PAA solutions range from 74 to 83 °C, those of 15% PAA solutions were between 68 and 81 °C.
Executive summary:

The flash point is normally determined for each commercial product. Reference values of 5% PAA solutions range from 74 to 83 °C, those of 15% PAA solutions were between 68 and 81 °C.

Description of key information

Flash point: 74 to 83 °C (5% solution), 68 and 81 °C (15% solution)

Key value for chemical safety assessment

Flash point at 101 325 Pa:
68 °C

Additional information

A survey of the determined flash point for commercial peracetic acid products revealed the reference values of 5% peracetic acid solutions range from 74 to 83 °C, while those of containing 15 peracetic acid were between 68 and 81 °C, respectively.