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Vapour pressure

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Reference
Endpoint:
vapour pressure
Type of information:
experimental study
Adequacy of study:
key study
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
test procedure in accordance with national standard methods
Qualifier:
no guideline followed
Principles of method if other than guideline:
Method for the measurement of vapour pressure with DSC 27HP
GLP compliance:
not specified
Type of method:
other: differential scanning calorimetry (DSC)
Key result
Temp.:
30 °C
Vapour pressure:
0.03 mBar
Conclusions:
For tert-Butylperoxy-3,5,5-trimethylhexanoat, the vapour pressure was determined to be 0.03 mbar at 30 °C.
Executive summary:

The vapour pressure of tert-Butylperoxy-3,5,5-trimethylhexanoat was determined at various temperatures with vacuum DSC (differential scanning calorimetry). The temperature range of the method is limited. The lower pressure limit depends on the capacity of the vacuum pump (about 0.5 mbar), the lower temperature limit of the DSC-apparatus (25 °C) or by the melting point of the product. The upper limit depends on the thermal stability of the product. In the case tert-Butylperoxy-3,5,5-trimethylhexanoat the lower pressure is limited by pump capacity.


Tert-Butylperoxy-3,5,5-trimethylhexanoat was measured in the temperature range of 65 °C up to 77 °C. One has to be careful with extrapolation. The error in the pressure will increase at extrapolation. High temperatures will give decomposition of the unstable product.


For tert-Butylperoxy-3,5,5-trimethylhexanoat the extrapolated vapour pressure was determined to be 0.03 mbar at 30 °C.

Description of key information

The vapour pressure of tert-Butylperoxy-3,5,5-trimethylhexanoat was determined at various temperatures with vacuum DSC (differential scanning calorimetry). For tert-butyl 3,5,5-trimethylperoxyhexanoate the vapour pressure was determined to be 0.03 mbar at 30 °C.

Key value for chemical safety assessment

Vapour pressure:
3 Pa
at the temperature of:
303.2 K

Additional information