Registration Dossier

Data platform availability banner - registered substances factsheets

Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

Diss Factsheets

Physical & Chemical properties

Vapour pressure

Currently viewing:

Administrative data

Link to relevant study record(s)

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 °C, the vp of Trigonox 125 -C75 is 100 Pa.


At ca. 35 °C, 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 °C is 100 Pa (contains 25 % isododecane). From this, the vapor pressure of the contained tert-amyl peroxypivalate is calculated as 14 Pa @ 35 °C.
Executive summary:

An experimental study was conducted to determine the vapour pressure of the test substance. As the pure tert-amyl peroxypivalate cannot be handled in its pure form, the experiments were conducted with commercially marketed Trigonox 125-C75 with a composition of 75 % tert-amyl peroxypivalate and 25 % isododecane. The vapor pressure of commercially marketed Trigonox 125-C75 at 35 °C is 100 Pa.  From this, the vapor pressure of the contained tert-amyl peroxypivalate is calculated as 14 Pa @ 35 °C.

Description of key information

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

Key value for chemical safety assessment

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

Additional information

An experimental study was conducted to determine the vapour pressure of the test substance. As the pure tert-amyl peroxypivalate cannot be handled in its pure form, the experiments were conducted with commercially marketed Trigonox 125-C75 with a composition of 75 % tert-amyl peroxypivalate and 25 % isododecane. The vapor pressure of commercially marketed Trigonox 125-C75 at 35 °C is 100 Pa.  From this, the vapor pressure of the contained tert-amyl peroxypivalate is calculated as 14 Pa @ 35 °C.