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

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.:

175.6 °C

Vapour pressure:

549 hPa

Test no.:

#2

Temp.:

175 °C

Vapour pressure:

528 hPa

Test no.:

#3

Temp.:

167.8 °C

Vapour pressure:

512 hPa

Test no.:

#4

Temp.:

150.7 °C

Vapour pressure:

377 hPa

Test no.:

#5

Temp.:

20 °C

Vapour pressure:

15 hPa

Remarks on result:

other: Extrapolated vapour pressure value.

Results

The solid sample was charged to the test cell and installed into the vessel before applying vacuum to remove the air. The sample was heated at a rate of 5 K/min with stirring and pressure readings taken at 25 °C intervals. The sample appeared to melt between 125-150 °C. The values above 150 °C have been quoted, as representative temperature measurements could not be obtained until all the sample was homogeneous and being stirred adequately. Corrections have been made for any residual pad gas remaining in the sample container at the start of the experiment.

Temperature,°C	VapourPressure,hPa
150.7	377
167.8	512
175.0	528
175.6	549

These data have been extrapolated to give a vapour pressure of 15 hPa at 20 °C.

 

Description of key information

Vapour pressure is 15 hPa at 20 °C (EU A.4, static method).

Key value for chemical safety assessment

Vapour pressure:

15 hPa

at the temperature of:

20 °C