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Vapour pressure

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Reference
Endpoint:
vapour pressure
Type of information:
experimental study
Adequacy of study:
key study
Study period:
2015-08-25 to 2016-01-29
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
OECD Guideline 104 (Vapour Pressure Curve)
Version / remarks:
2006
Deviations:
no
Qualifier:
according to guideline
Guideline:
EU Method A.4 (Vapour Pressure)
Version / remarks:
2009
Deviations:
no
Qualifier:
according to guideline
Guideline:
EPA OPPTS 830.7950 (Vapor Pressure)
Version / remarks:
1996
Deviations:
no
GLP compliance:
yes (incl. QA statement)
Type of method:
effusion method: by loss of weight or by trapping vaporisate
Key result
Temp.:
20 °C
Vapour pressure:
0.001 Pa
Key result
Temp.:
25 °C
Vapour pressure:
0.001 Pa

The measured values for temperature and vapour pressure were evaluated as follows:  

Parameter

T

Mean P

1/T

log P

Unit

K

Pa

1/K

log Pa

Value

303.2

1.47E-03

3.2982E-03

2.8315

318.2

4.40E-03

3.147E-03

-2.3566

333.2

1.20E-02

3.0012E-03

-1.9224

 

A graph with log P vs. 1/T was plotted. Since the values were correlated by a linear relation, the data could be fitted by linear regression.

Parameter

Value

Slope

-3061.3

Intercept

7.2646

Correlation Coefficient r

-1.0000

Coefficient of Determination r2

1.0000

 

 The following vapour pressures were determined experimentally and considered as valid (mean and standard deviation given): 

T

T

P

Stand. Dev. P

RSD P

°C

K

Pa

Pa

%

30.0

303.2

1.47E-03

1.62E-04

11.0%

45.0

318.2

4.40E-03

5.06E-03

11.5%

60.0

333.2

1.20E-02

3.23E-03

27.0%

 

Conclusions:
The vapour pressure of the test item was determined to be 6.64E-4 Pa at 20 °C and 9.93E-4 Pa at 25 °C.
Executive summary:

A study was conducted according to OECD TG 104, Regulation (EC) No 440/2008 method A.4 and OPPTS 830.7950 to determine the vapour pressure of the test item. The vapour pressure of the test item SIKA Hardener LI was determined at four different temperatures (30, 45, 60 and 75 °C) following EU A.4 using the effusion method (weight loss). Experiment 4 (temperature 75 °C) showed clear signs of decomposition and to avoid bias, these measurements were not used for calculations. Three experiments could be evaluated as they showed relevant and reproducible weight loss. All evaluated experiments showed good to medium reproducibility, giving a perfect correlation. Therefore, the result of the test can be considered valid. The vapour pressure of the test item was determined to be 6.64E-4 Pa at 20 °C and 9.93E-4 Pa at 25 °C.

Description of key information

The vapour pressure of the test item was determined to be 6.64E-4 Pa at 20 °C and 9.93E-4 Pa at 25 °C.

Key value for chemical safety assessment

Vapour pressure:
0.001 Pa
at the temperature of:
20 °C

Additional information

A study was conducted according to OECD TG 104, Regulation (EC) No 440/2008 method A.4 and OPPTS 830.7950 to determine the vapour pressure of the test item. The vapour pressure of the test item SIKA Hardener LTJ was determined at four different temperatures (30, 45, 60 and 75 °C) following EU A.4 using the effusion method (weight loss). Experiment 4 (temperature 75 °C) showed clear signs of decomposition and to avoid bias, these measurements were not used for calculations. Three experiments could be evaluated as they showed relevant and reproducible weight loss. All evaluated experiments showed good to medium reproducibility, giving a perfect correlation. Therefore, the result of the test can be considered valid. The vapour pressure of the test item was determined to be 6.64E-4 Pa at 20 °C and 9.93E-4 Pa at 25 °C.