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Physical & Chemical properties

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:
study well documented, meets generally accepted scientific principles, acceptable for assessment
Qualifier:
no guideline followed
Principles of method if other than guideline:
Measurement of vapour pressure with DSC ( Differential Scanning Calorimetry)
GLP compliance:
not specified
Type of method:
other: differential scanning calorimetry (DSC)
Key result
Temp.:
64.7 °C
Vapour pressure:
0.53 mBar
Remarks on result:
other: measured result, not calculated by Antoine fit or Clausius Clapeyron
Key result
Temp.:
67.3 °C
Vapour pressure:
0.63 mBar
Remarks on result:
other: measured result, not calculated by Antoine fit or Clausius Clapeyron
Key result
Temp.:
70.8 °C
Vapour pressure:
1.05 mBar
Remarks on result:
other: measured result, not calculated by Antoine fit or Clausius Clapeyron
Key result
Temp.:
74 °C
Vapour pressure:
1.45 mBar
Remarks on result:
other: measured result, not calculated by Antoine fit or Clausius Clapeyron
Key result
Temp.:
76.7 °C
Vapour pressure:
2 mBar
Remarks on result:
other: measured result, not calculated by Antoine fit or Clausius Clapeyron

- The test substance vapour pressure was measured in the temperature range of 65°C up to 77°C. Extrapolation was carried out, showing that error increases drastically with too far extrapolation

- The measurements were performed at tempertaures that are far above the SADT of the tets substance. Handeling the test substance at these temperatures while doing the DSC test was possible because very low amounts were used and the measurements were very fast.

Conclusions:
At temperatures between 65 °C to 77 °C vapour pressure between 0.53 to 2.0 mBar was measured for tert-butyl peroxyneodecanoate (TBPND).
Executive summary:

The vapour pressure of TBPND, 95 % purity, was measured at various temperatures with vaccum DSC. 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 Trigonox 23 the lower pressure is limited by the pump capacity. The vapour pressure of Trigonox 23 in the temperature range of 65 °C to 77 °C was measured although the temperatures were above the SADT. That was feasible in this DSC test as the amounts used were low and the measurements were very fast. At temperatures between 65 °C to 77 °C vapour pressure between 0.53 to 2.0 mBar was measured for tert-butyl peroxyneodecanoate (TBPND). Extrapolation of the obtained results showed that the error in the pressure will increase at extrapolation.

Description of key information

At temperatures between 65 °C to 77 °C vapour pressure between 0.53 to 2.0 mBar was measured for tert-butylperoxyneodecanoate (TBPND). 

Key value for chemical safety assessment

Vapour pressure:
53 Pa
at the temperature of:
65 °C

Additional information

The vapour pressure of tert-butyl peroxyneodecanoate (TBPND), 95 % purity, was measured at various temperatures with vaccum DSC. The vapour pressure of the test substance in the temperature range of 65 °C to 77 °C was measured although the temperatures were above the SADT. That was feasible in this DSC test as the amounts used were low and the measurements were very fast. At temperatures between 65 °C to 77 °C, vapour pressure between 0.53 to 2.0 mBar was measured for TBPND. Extrapolation of the obtained results showed that the error in the pressure will increase at extrapolation. Based on the measured value at 65°C the vapour pressure was extrapolated to 4.65 Pa at 25°C and 0.71 Pa at 0°C the last of which consider the temperature of the industrial use.