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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
Study period:
June 2011
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
other: see 'Remark'
Remarks:
The endpoint is based on experimental work (DSC) with a phlegmatizer/peroxide and calculation. It is not possible to measure the vapour pressure of the substance itself. The Self-Accelerating Decomposition Temperature (SADT) of the substances is 15°C (reference SADT: CLP regulations 2.15.2.3 and UN Recommendations on the Transport of Dangerous Goods, Manual of Tests and Criteria, 5th revised edition, sub-sections 28.1, 28.2, 28.3 and Table 28.3.)
Qualifier:
equivalent or similar to
Guideline:
OECD Guideline 104 (Vapour Pressure Curve)
Deviations:
not specified
Principles of method if other than guideline:
DSC( Differential scanning calorimetry) and calculation
GLP compliance:
no
Type of method:
other: DSC( Differential scanning calorimetry)
Temp.:
25 °C
Vapour pressure:
< 0.24 Pa
Remarks on result:
other: For 1,1,3,3-tetramethylbutyl peroxyneodecanoate 70% solution In odourless mineral spirit
Temp.:
25 °C
Vapour pressure:
> 0 - < 0.01 Pa
Remarks on result:
other: For 1,1,3,3-tetramethylbutyl peroxyneodecanoate pure

Two methods are applied to estimate the vapour pressure of Trigonox 423:

-   For Tx 423-C70: DSC method in combination with the calculated heat of evapouration: Pvap< 0.24 Pa at 25 °C. 

-   For Tx 423-pure: From the relation between vapour pressure and mol weight: Pvapwill most likely be in the range of 0.01 to 0.0001 Pa at 25 °C.

 

 

Conclusions:
The vapour pressure of 1,1,3,3-tetramethylbutyl peroxyneodecanoate 70% in isododecane at 25°C is below 0.24 Pa, or below 0.0024 mBar. The vapour pressure of 1,1,3,3-tetramethylbutyl peroxyneodecanoate pure at 25°C is most likely around 0.01 to 0.0001 Pa, or around 1*10-4 to 1*10-6 mBar.
Executive summary:

The vapour pressure of Trigonox 423 at 25°C is calculated from experimental data and it is estimated from the relation between vapour pressure and molecular weight of different substances.

The vapour pressure of 1,1,3,3-tetramethylbutyl peroxyneodecanoate 70% in isododecane at 25°C is below 0.24 Pa, or below 0.0024 mBar.

The vapour pressure of 1,1,3,3-tetramethylbutyl peroxyneodecanoate pure at 25°C is most likely around 0.01 to 0.0001 Pa, or around 1*10-4 to 1*10-6 mBar.

Description of key information

The vapour pressure of  1,1,3,3-tetramethylbutyl peroxyneodecanoate 70% s in isododecane  at 25°C is below 0.24 Pa. The vapour pressure of   1,1,3,3-tetramethylbutyl peroxyneodecanoate pure at 25°C is most likely around 0.01 to 0.0001 Pa.
The vapour pressure of the test substance at -10°C was determined to be:P(-10°C) = 7.6 ± 0.6 Pa.
The vapour pressure of the test substance at 15°C was determined to be :P(15°C) = 58 ± 5 Pa

Key value for chemical safety assessment

Vapour pressure:
0.01 Pa
at the temperature of:
25 °C

Additional information

The study in 51240-95-0, Vapour pressure, Nuysink , 2006, RS confirms the findings in the key study:

The vapour pressure of 1,1,3,3-tetramethylbutyl peroxyneodecanoate 70% in isododecane

is less than 0.06 mBar = 6 Pa at 25°C.

The study: 51240-95-0, Vapour pressure, Bohle NOTOX, 1991, DS is disregarded,

because:The method used is not applicable for unstable substances. The measured vapour pressure is caused by decomposition of the substance.

The Self-Accelerating Decomposition Temperature (SADT) of the substances is 15°C (reference SADT: CLP regulations 2.15.2.3 and UN Recommendations on the Transport of Dangerous Goods, Manual of Tests and Criteria, 5th revised edition, sub-sections 28.1, 28.2, 28.3 and Table 28.3.)