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Vapour pressure

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Reference
Endpoint:
vapour pressure
Type of information:
experimental study
Adequacy of study:
key study
Study period:
October 1997
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:
vacuum DSC
GLP compliance:
no
Other quality assurance:
other: ISO 9001
Type of method:
other: vacuum DSC
Test no.:
#1
Temp.:
34.7 °C
Vapour pressure:
100 Pa
Remarks on result:
other: vp of Trigonox 125-C75
Test no.:
#2
Temp.:
38.4 °C
Vapour pressure:
150 Pa
Remarks on result:
other: vp of Trigonox 125-C75
Test no.:
#3
Temp.:
42.8 °C
Vapour pressure:
302 Pa
Remarks on result:
other: vp of Trigonox 125-C75
Test no.:
#4
Temp.:
45.2 °C
Vapour pressure:
402 Pa
Remarks on result:
other: vp of Trigonox 125-C75
Test no.:
#6
Temp.:
34.7 °C
Vapour pressure:
345 Pa
Remarks on result:
other: vp of isododecane solvent control from Boerdijk, 2000, PCS200000009
Key result
Test no.:
#7
Temp.:
34.7 °C
Vapour pressure:
14 Pa
Remarks on result:
other: calculated vp of tert-amyl peroxypivalate in Trigonox 125-C75

Derived Antoine equation for Trigonox 125 -C75:

log p (mbar) = 9.9677-1583.75/(T-149.23) (T in K)

Derived Antoine equation for isododecane solvent control (from from Boerdijk, 2000, PCS200000009):

log p (mbar) = 7.036-1515.1/(T-74.70) (T in K)

At ca. 35 oC, the vp of Trigonox 125 -C75 is 100 Pa.

At ca. 35 oC, the vp of the isododecane used is 345 Pa.

As Trigonox 125-C75 is 75 % tert-amyl peroxypivalate and 25 % isododecane, the vp of tert-amyl peroxypivalate in the Trigonox 125 -C75 can be calculated as (100 - 345/4) Pa = ca. 14 Pa

Conclusions:
The vapor pressure of commercially marketed Trigonox 125-C75 at 35 oC is 100 Pa (contains 25 % isododecane). From this, the vapor pressure of the contained tert-amyl peroxypivalate is calculated as 14 Pa @ 35 oC.
Executive summary:

The vapor pressure of the contained tert-amyl peroxypivalate is calculated as 14 Pa @ 35 oC.

Description of key information

The vapor pressure of commercially marketed Trigonox 125-C75 at 35 oC is 100 Pa (contains 25 % isododecane).  From this, the vapor pressure of the contained tert-amyl peroxypivalate is calculated as 14 Pa @ 35 oC.

Key value for chemical safety assessment

Vapour pressure:
14 Pa
at the temperature of:
35 °C

Additional information