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The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

Diss Factsheets

Administrative data

Endpoint:
vapour pressure
Type of information:
experimental study
Adequacy of study:
key study
Study period:
From 18 December 2018 to 05 April 2019
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
2019
Report date:
2019

Materials and methods

Test guidelineopen allclose all
Qualifier:
according to guideline
Guideline:
EU Method A.4 (Vapour Pressure)
Version / remarks:
2016
Deviations:
no
Qualifier:
according to guideline
Guideline:
OECD Guideline 104 (Vapour Pressure Curve)
Version / remarks:
2006
Deviations:
no
GLP compliance:
yes
Type of method:
effusion method: isothermal thermogravimetry

Test material

Constituent 1
Chemical structure
Reference substance name:
Benzenesulfonic acid, C10-24-branched and linear alkyl derivs., magnesium salts, overbased
EC Number:
948-935-1
Molecular formula:
Molecular formula cannot be determined for this UVCB substance
IUPAC Name:
Benzenesulfonic acid, C10-24-branched and linear alkyl derivs., magnesium salts, overbased
Test material form:
liquid: viscous
Details on test material:
Batch (Lot) Number: R18 14728
Expiry date: 08 October 2020 (expiry date)
Physical Description: Dark amber viscous liquid
Purity/Composition: UVCB
Storage Conditions: At room temperature
Specific details on test material used for the study:
Decomposition temperature: 200°C

Results and discussion

Vapour pressureopen allclose all
Key result
Temp.:
20 °C
Vapour pressure:
0 Pa
Key result
Temp.:
25 °C
Vapour pressure:
0 Pa

Any other information on results incl. tables

Table: Results of the vapour pressure isothermal TGA analysis (substance)

Experiment

Temperature
[°C]

Weight loss
[µg/min]

νT
[g/cm2/h]

log νT

log PT

PT
[Pa]

1

140

1.66164

1.98E-4

-3.70

0.37

2.4

 

150

2.92565

3.49E-4

-3.46

0.68

4.8

 

160

5.05931

6.04E-4

-3.22

0.98

9.7

 

170

8.41704

1.00E-3

-3.00

1.26

18

2 (1)

140

0.544359

6.50E-5

-4.19

-0.24

0.57

 

150

1.67991

2.01E-4

-3.70

0.38

2.4

 

160

2.63039

3.14E-4

-3.50

0.62

4.2

 

170

5.12360

6.12E-4

-3.21

0.99

9.8

3

140

1.39105

1.66E-4

-3.78

0.27

1.9

 

150

2.50687

2.99E-4

-3.52

0.60

4.0

 

160

4.25815

5.08E-4

-3.29

0.89

7.8

 

170

7.17004

8.56E-4

-3.07

1.18

15

(1) not used for the result

Applicant's summary and conclusion

Conclusions:
The vapour pressure of the substance at 20°C and 25°C was determined to be 8.1E-6 Pa and 1.7E-5 Pa, respectively.
Executive summary:

The vapour pressure of the substance was determined using the isothermal thermogravimetric effusion method in a GLP study based on EC A.4 and OECD 104. Validation of the method was performed using a set of five reference substances. The vapour pressure regression curve (log PT as function of 1/T; with T in K) of the substance was constructed from weight losses measured at 140°C, 150°C, 160°C and 170°C.

The vapour pressure of the substance at 20°C and 25°C was extrapolated from the vapour pressure curve to be 8.1E-6 Pa and 1.7E-5 Pa, respectively.