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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:
2017-06-14 to 2017-08-23
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Remarks:
Well documented guideline study with GLP.
Qualifier:
according to guideline
Guideline:
EU Method A.4 (Vapour Pressure)
Deviations:
no
Qualifier:
according to guideline
Guideline:
OECD Guideline 104 (Vapour Pressure Curve)
Version / remarks:
OECD test guideline 104 (2006)
Deviations:
no
Qualifier:
according to guideline
Guideline:
other: OECD 113 Thermal Stability
Version / remarks:
OECD test guideline 113 (1981) Thermal stability
Deviations:
no
Qualifier:
according to guideline
Guideline:
EPA OPPTS 830.7950 (Vapor Pressure)
Version / remarks:
EPA OCSPP Test Guideline 830.7950 (1996)Vapor Pressure
Deviations:
no
GLP compliance:
yes (incl. QA statement)
Type of method:
effusion method: Knudsen cell
Specific details on test material used for the study:
Test item: Tall oil pitch, reaction product with triethylene glycol
CAS RN: 2135769-54-7
Batch No.: LABO 16-02
Acid number: 10 mg KOH/g (DRT 3232)
Dropping point: 27.5 °(DRT 4030)
Appearance: Black, viscous liquid
Molecular weight: 1515 g/mol
Storage conditions: Room temperature under nitrogen
Date of manufacture: 2016-11-14
Expiry date: 2018-11-14
Key result
Test no.:
#1
Temp.:
20 °C
Vapour pressure:
0.001 Pa
Test no.:
#2
Temp.:
25 °C
Vapour pressure:
0.002 Pa
Test no.:
#3
Temp.:
50 °C
Vapour pressure:
0.004 Pa

The test item showed no thermal effects in the temperature range of 25 -300 °C.

Table 1.Results of the Effusion method for the estimated average molecular weight.

Segment No.

Temperature (°C)

Vapour pressure (Pa)

1

81

1.1 x 10-2

2

91

1.3 x 10-2

3

101

1.7 x 10-2

4

111

2.2 x 10-2

5

121

2.7 x 10-2

6

131

3.4 x 10-2

7

141

4.4 x 10-2

The vapour pressur of Tall oil pith, reaction product with triethylene glycol was calculated by extrapolation of the measured vapour pressure curve for the temperatures 20, 25 and 50 °C with the estimated average molecular weight of 1515 g/mol. The estimated molecular weight is assumed to be adequate as it is close to the main component of the test item.

Table 2. Extrapolated vapour pressure at 20, 25 and 50 °C

Temperature (°C)

Vapour pressure (Pa)

20

1.4 x 10-3

25

1.7 x 10-3

50

4.1 x 10-3

Conclusions:
The vapour pressure of Tall oil pitch, reaction product with triethylene glycol at 20, 25 and 50 °C was, 1.4 x 10^-3, 1.7 x 10^-3and 4.1 x 10^-3 Pa, respectively.
Executive summary:

The vapour pressure of Tall oil pitch, reaction product with triethylene glycol was determined using the Knudsen cell effusion method and according to OECD 104. The vapour pressure of the test item at 20, 25 and 50 °C was, 1.4 x 10-3, 1.7 x 10-3and 4.1 x 10-3Pa, respectively.

Description of key information

The vapour pressure of Tall oil pitch, reaction product with triethylene glycol was determined using the Knudsen cell effusion method and according to OECD 104. The vapour pressure of the test item at 20, 25 and 50 °C was, 1.4 x 10-3, 1.7 x 10-3and 4.1 x 10-3Pa, respectively.

Key value for chemical safety assessment

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

Additional information

The vapour pressure was calculated using an estimated average molecular weight of 1515 g/mol, which was considered adequate as it is close to the molecular weight of the main component of Tall oil pitch, reaction product with triethylene glycol.

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