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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:
27 March 2017 - 28 November 2017
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Remarks:
Main study was conducted in accordance with international guidelines and in accordance with GLP. All guideline validity criteria were met.
Qualifier:
according to guideline
Guideline:
EU Method A.4 (Vapour Pressure)
Version / remarks:
Regulation (EC) 440/2008 of 30 May 2008
Deviations:
no
Qualifier:
according to guideline
Guideline:
OECD Guideline 104 (Vapour Pressure Curve)
Version / remarks:
23 March 2006
Deviations:
no
Qualifier:
according to guideline
Guideline:
other: OECD Guideline 113 (Screening Test for Thermal Stability and Stability in Air)
Version / remarks:
12 May 1981
Deviations:
no
GLP compliance:
yes (incl. QA statement)
Type of method:
effusion method: vapour pressure balance
Key result
Temp.:
20 °C
Vapour pressure:
0 Pa
Temp.:
25 °C
Vapour pressure:
0 Pa
Temp.:
50 °C
Vapour pressure:
0.002 Pa
Transition / decomposition:
no
Remarks:
No thermal effects were determined up to 300 °C.

Table 2:          Results Thermal Stability

No.

Sample weight / mg

Start / °C

Energy / J/g

Remark

PN13301

4.00

---

---

No thermal effects observed.

 

Table 3:          Results of Effusion method: Vapour pressure balance

No.

Temperature / °C

Vapour pressure / Pa

1

40

8.60 × 10-4

2

43

1.09 × 10-3

3

46

1.39 × 10-3

4

49

1.69 × 10-3

5

52

2.02 × 10-3

6

56

2.69 × 10-3

 

From the measured data points of the vapour pressure curve the constants A and B of the Antoine equation

log10p = A + B/T = A + B/(C+t)

can be derived by regression of the data points to

T = temperature in Kelvin

t = temperature in Celsius

A = 7.0059

B = -3151.59

C = 273.15.

The vapour pressure of the dried test item was calculated by interpolation and extrapolation of the measured vapour pressure curve for the temperatures 20, 25 and 50 °C.

Table 4:          Calculated Vapour Pressure of the Test Item at 20 °C, 25 °C and 50 °C.

Temperature / °C

Vapour pressure / Pa

20

1.8 × 10-4

25

2.7 × 10-4

50

1.8 × 10-3

 

Conclusions:
The vapour pressure of the test item was calculated using the effusion method (vapour pressure balance) in accordance with test guideline EU A.4 and OECD guideline 104 (2006).

The vapour pressure was calculated by extrapolation of measured vapour pressure data for 20  ̊C (VP = 0.00018 Pa), 25  ̊C (VP = 0.00027 Pa) and 50  ̊C (VP = 0.0018 Pa).
Executive summary:

EU Method A.4. – The vapour pressure of the test item was determined utilising the effusion method (vapour pressure balance).  The procedure employed was designed to be compatible with Method A.4. Vapour Pressure of Commission Regulation (EC) No 440/2008 of 30 May 2008.

The vapour pressure of the test item was measured across a temperature range of 40 to 56 °C.  Values measured across this range showed a good linear response.  The test item vapour pressure at 20 °C, 25 °C and 50 °C was extrapolated from a regression of measured values.  

The vapour pressure of the test item has been determined to be 1.8 x 10-4 Pa at 20.0 °C.

Description of key information

Vapour Pressure: 0.00018 Pa at 20°C; EU Method A.4.; H Smeykal (2017)

Key value for chemical safety assessment

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

Additional information

EU Method A.4. – The vapour pressure of the test item was determined utilising the effusion method (vapour pressure balance).  The procedure employed was designed to be compatible with Method A.4. Vapour Pressure of Commission Regulation (EC) No 440/2008 of 30 May 2008.

The vapour pressure of the test item was measured across a temperature range of 40 to 56 °C.  Values measured across this range showed a good linear response.  The test item vapour pressure at 20 °C, 25 °C and 50 °C was extrapolated from a regression of measured values.  

The vapour pressure of the test item has been determined to be 1.8 x 10-4 Pa at 20.0 °C.