tert-pentyl peroxypivalate

Vapour pressure

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.