Reaction mass of 2-dodecylhexadecyl methacrylate and 2-Tetradecyloctadecyl methacrylate

Vapour pressure

Link to relevant study record(s)

Reference

Endpoint:

vapour pressure

Type of information:

experimental study

Adequacy of study:

key study

Study period:

2019-01-02

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

according to guideline

Guideline:

other: ASTM D 2879 – 97 (2007)

Deviations:

yes

Remarks:

Instead of the mercury manometer stipulated for pressure measurement in the ASTM method, a digital electronic pressure gauge was used

Principles of method if other than guideline:

- Principle of test: The method was a modified version of the one described in ASTM D 2879- 97 (2007). Instead of the mercury manometer stipulated for pressure measurement in the ASTM method, a digital electronic pressure gauge was used.
- Short description of test conditions: The sample was well mixed before being placed in the borosilicate glass cell, which was then connected to the vacuum and pressure measurement systems. The sample was cooled to minus 50°C and subjected to slow evacuation to remove entrained air. Five cooling/ evacuation procedures were carried out before the sample cell pressure was reduced to less than 0.1 mm Hg.
- Parameters analysed / observed: Sample and measurement systems were placed in a water bath maintained at 20°C and the pressure attained at equilibrium noted. Three measurements were made, using fresh sample for each test.

GLP compliance:

no

Type of method:

isoteniscope

Key result

Temp.:

20 °C

Vapour pressure:

0.6 hPa

Test	Vapour Pressure at 20^oC/ hPa
1	0.60
2	0.61
3	0.59
Average	0.60

Conclusions:

The Vapour Pressure of Reaction Mass of 2-propenoic acid, 2-methyl-, 2 dodecylhexadecyl ester and 2-propenoic acid, 2methyl-, 2-tetradecyloctadecyl ester at 20°C is 0.60hPa.

Executive summary:

The Vapour Pressure of Reaction Mass of 2-propenoic acid, 2-methyl-, 2 dodecylhexadecyl ester and 2-propenoic acid, 2methyl-, 2-tetradecyloctadecyl ester was established using a modified version of the method described in ASTM D 2879 -97 (2007) (Standard Test method for Vapour Pressure-Temperature relationship and initial decomposition temperature of liquids by Isoteniscope). A digital electronic pressure gauge was used for pressure measurement in place of a mercury manometer (specified in guideline) however, this is believed to have not affected the final results. Using a fresh sample for each test three measurements were made. The average vapour pressure at 20°C was established to be 0.60hPa.

Description of key information

The Vapour Pressure of Reaction Mass of 2-propenoic acid, 2-methyl-, 2 dodecylhexadecyl ester and 2-propenoic acid, 2methyl-, 2-tetradecyloctadecyl ester was established using a modified version of the method described in ASTM D 2879 -97 (2007) (Standard Test method for Vapour Pressure-Temperature relationship and initial decomposition temperature of liquids by Isoteniscope). A digital electronic pressure gauge was used for pressure measurement in place of a mercury manometer (specified in guideline) however, this is believed to have not affected the final results. Using a fresh sample for each test three measurements were made. The average vapour pressure at 20°C was established to be 0.60hPa.

Key value for chemical safety assessment

Vapour pressure:

0.6 hPa

at the temperature of:

20 °C