1,1,3,3-tetramethylbutyl peroxyneodecanoate

Vapour pressure

Link to relevant study record(s)

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

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: P_vap< 0.24 Pa at 25 °C. 

-   For Tx 423-pure: From the relation between vapour pressure and mol weight: P_vapwill 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.)