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Physical & Chemical properties

Vapour pressure

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Reference
Endpoint:
vapour pressure
Type of information:
experimental study
Adequacy of study:
key study
Study period:
2017
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to
Guideline:
OECD Guideline 104 (Vapour Pressure Curve)
Deviations:
no
Qualifier:
according to
Guideline:
EU Method A.4 (Vapour Pressure)
Deviations:
no
GLP compliance:
no
Other quality assurance:
ISO/IEC 17025 (General requirements for the competence of testing and calibration laboratories)
Type of method:
effusion method: Knudsen cell
Specific details on test material used for the study:
SOURCE OF TEST MATERIAL
- Source and lot/batch No.of test material: Batch E323
- Expiration date of the lot/batch: 11 July 2018
- Purity test date:92.7% on 11 July 2016

Key result
Test no.:
#9
Temp.:
ca. 150 °C
Vapour pressure:
ca. 0.022 Pa
  • Measurement Data Experiment 9

Experiment

9

 

 

 

Nom. Temperature

150

°C

 

 

Date and time START

 

28.06.2017 12:55

29.06.2017 12:35

03.07.2017 10:30

Date and time END

 

29.06.2017 11:45

30.06.2017 11:30

04.07.2017 12:00

Parameter

Weight m

Weight m

Weight m

Weight m

Unit

g

g

g

g

Knudsen-cell 1

3.58397

3.58323

3.58318

3.56880

Knudsen-cell 2

3.58112

3.58067

3.58011

3.57180

Knudsen-cell 3

3.44545

3.44498

3.44464

3.43860

Knudsen-cell 4

3.61839

3.61776

3.61727

3.60955

  • Calculation Results Experiment 9

Experiment

9

 

 

 

 

 

 

 

 

Real Temperature in K

423.2

 

 

 

 

 

 

 

 

Real Temperature in °C

150.0

 

 

 

 

 

 

 

 

Date of Measurement

29.06.2017 11:45

30.06.2017 11:30

04.07.2017 12:00

Elapsed Time in s

82200

82500

91800

Parameter

Weight loss

to be used

Vapour pressure

Weight loss

to be used

Vapour pressure

Weight loss

to be used

Vapour pressure

Unit

g

yes/no

Pa

g

yes/no

Pa

g

yes/no

Pa

Knudsen-cell 1

0.00074

yes

1.99E-03

0.00005

yes

1.34E-04

0.01438

yes

3.46E-02

Knudsen-cell 2

0.00045

yes

1.21E-03

0.00056

yes

1.50E-03

0.00831

yes

2.00E-02

Knudsen-cell 3

0.00047

yes

1.26E-03

0.00034

yes

9.10E-04

0.00604

yes

1.45E-02

Knudsen-cell 4

0.00063

yes

1.69E-03

0.00049

yes

1.31E-03

0.00772

yes

1.86E-02

Mean

 

yes

1.54E-03

 

yes

9.63E-04

 

yes

2.19E-02

Standard deviation:

 

 

3.70E-04

 

 

6.05E-04

 

 

8.76E-03

Mean of measured values:

 

8.140E-03

 

 

 

 

 

 

Standard deviation:

 

1.194E-02

RSD:

146.6%

 

 

 

 

  • Results:

Vapour pressure was examined at nine different temperatures. No temperatures could be evaluated as they showed no reproducible or relevant weight loss.

As a calculation on base of the measured weight losses is not possible, the highest vapour pressure, derived from all measurements, is stated as limit value. At the first measurement of experiment 1 (30 °C) impurities like water can yield a higher vapour pressure, therefore these measurements were not taken into account.

 

Vapour pressure at 150 °C:        2.19* 10-02Pa

Executive summary:

Vapour pressure was examined at nine different temperatures. No temperatures could be evaluated as they showed no reproducible or relevant weight loss.

As a calculation on base of the measured weight losses is not possible, the highest vapour pressure, derived from all measurements, is stated as limit value. At the first measurement of experiment 1 (30 °C) impurities like water can yield a higher vapour pressure, therefore these measurements were not taken into account.

 

Vapour pressure at 150 °C:        2.19* 10-02Pa

Description of key information

1      Results

Vapour pressure was examined at nine different temperatures. No temperatures could be evaluated as they showed no reproducible or relevant weight loss.

As a calculation on base of the measured weight losses is not possible, the highest vapour pressure, derived from all measurements, is stated as limit value. At the first measurement of experiment 1 (30 °C) impurities like water can yield a higher vapour pressure, therefore these measurements were not taken into account.

 

Vapour pressure at 150 °C:        2.19* 10-02Pa

Key value for chemical safety assessment

Vapour pressure:
0.022 Pa
at the temperature of:
150 °C

Additional information

1      Results

Vapour pressure was examined at nine different temperatures. No temperatures could be evaluated as they showed no reproducible or relevant weight loss.

As a calculation on base of the measured weight losses is not possible, the highest vapour pressure, derived from all measurements, is stated as limit value. At the first measurement of experiment 1 (30 °C) impurities like water can yield a higher vapour pressure, therefore these measurements were not taken into account.

 

Vapour pressure at 150 °C:        2.19* 10-02Pa