Glycine, N-methyl-, N-coco acyl derivs.

Vapour pressure

Link to relevant study record(s)

Reference

Endpoint:

vapour pressure

Type of information:

experimental study

Adequacy of study:

key study

Study period:

18 March 2018

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

according to guideline

Guideline:

EU Method A.4 (Vapour Pressure)

Deviations:

not specified

GLP compliance:

not specified

Type of method:

static method

Test no.:

#1

Temp.:

100 °C

Vapour pressure:

375 hPa

Test no.:

#2

Temp.:

75 °C

Vapour pressure:

214 hPa

Test no.:

#3

Temp.:

50 °C

Vapour pressure:

102 hPa

Test no.:

#4

Temp.:

20 °C

Vapour pressure:

40 hPa

Remarks on result:

other: Extrapolated vapour pressure value

Vapour Pressure Results

The sample was a waxy substance so was pre-heated to a liquid (40 °C) enabling it to be charged to the test cell. The test cell was installed into the vessel before applying vacuum to remove the air. The sample was heated at a rate of 5 K.min-1 with stirring and pressure readings taken at 25 °C intervals to 150 °C. The sample appeared to melt between 25-50 °C. The values above 50 °C have been quoted, as representative temperature measurements could not be obtained until all the sample was homogeneous and being stirred adequately. We suspect there was some decomposition at some temperature above 100°C and on completion of the test it was observed that the sample was slightly darker in colour.

Corrections have been made for any residual pad gas remaining in the sample container at the start of the experiment.

Temperature,°C	Vapour Pressure,hPa
50	102
75	214
100	375

These data have been extrapolated to give a vapour pressure of 40 hPa at 20 °C.

Description of key information

Vapour pressure is 40 hPa at 20 °C (EU A.4, static method).

Key value for chemical safety assessment

Vapour pressure:

40 hPa

at the temperature of:

20 °C

Additional information

Result is extrapolated from experimental data at higher temperatures.