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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:
26 June 2018
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Justification for type of information:
The study was conducted according to an internationally recognised method, and under GLP. No deviation was reported. Test substance is adequately specified. Therefore full validation applies.
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:
Commission Regulation (EC) No 761/2009 of 23. July 2009, published on 24. Aug. 2009
Deviations:
no
Principles of method if other than guideline:
Not applicable
GLP compliance:
yes (incl. QA statement)
Remarks:
GLP certificate (inspected on 15 to 16 November 2017 / signed on 15 May 2018)
Type of method:
static method
Key result
Test no.:
#1
Temp.:
20 °C
Vapour pressure:
1 172 Pa
Key result
Test no.:
#2
Temp.:
25 °C
Vapour pressure:
1 526 Pa

Table 4.6/2: Calculated values for 1/T and log P

n Temperature T Pressure p Temperature T 1/T log p
  °C hPa  K 1/K log Pa
1 20.0 11,4 293,15 0,003411 3,0569
2 28,9 19 302,05 0,003311 3,2788
3 38.0 31,6 311,15 0,003214 3,4997
4 47.0 43,4 320,15 0,003124 3,6375
5 55,9 63,1 329,05 0,003039 3,8000
6 48.0 41,2 321,15 0,003114 3,6149
7 39,1 32,4 312,25 0,003203 3,5105
8 30.0 22,5 303,15 0,003299 3,3522
9 21,9 14 295,05 0,003389 3,1461
10 16.0 8 289,15 0,003458 2,9031

linear regression :

y = -2005.803371 x + 9.911095613

r² = 0.980310731 (> 0.95)

Table 4.6/3: Calculated Values for vapour pressure

Parameter

Value

Vapour Pressure (20 °C)

1172 Pa

(interpolation)

Vapour Pressure (25 °C)

1526 Pa

(interpolation)

 

The values of the heating and cooling down phase showed good correspondence and the coefficient of determination r² was > 0.95. Therefore, the result of the study is considered valid.

Conclusions:
The vapour pressure of the test item was calculated as 1172 Pa at 20.0 °C and 1526 Pa at 25 °C (interpolation).

Executive summary:

The vapour pressure of the test substance was measured under GLP according to OECD 104 / EU A4 guideline, static method.

Ten pairs temperature/vapour pressure were used to calculate a regression in a temperature range of 16.0 – 55.9 °C, from which vapour pressure at ambient temperature could be estimated.

From the measured values, the vapour pressure of the test item was calculated as 1172 Pa at 20.0 °C and 1526 Pa at 25 °C.

These values represent the most volatile components.

Description of key information

The vapour pressure of the test item was calculated as 1172 Pa at 20.0 °C and 1526 Pa at 25 °C (interpolation).

These values represent the most volatile components.

Key value for chemical safety assessment

Vapour pressure:
1 172 Pa
at the temperature of:
20 °C

Additional information

A fully reliable experimental study, conducted according to a recognized OECD/EC method and under GLP, is available. Therefore, it is considered as a key study.

The vapour pressure of the test item was calculated as 1172 Pa at 20.0 °C and 1526 Pa at 25 °C.

These values represent the most volatile components.