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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:
1993-11-23 to 1994-03-23
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
EU Method A.4 (Vapour Pressure)
Version / remarks:
EEC 92/69
Deviations:
no
Qualifier:
according to guideline
Guideline:
OECD Guideline 104 (Vapour Pressure Curve)
Version / remarks:
1981
Deviations:
no
GLP compliance:
yes
Type of method:
static method
Specific details on test material used for the study:
Analytical purity: >= 99.65 %
Lot/batch No.: 93.166
Key result
Temp.:
20 °C
Vapour pressure:
< 0 Pa

Results

Vapour pressures are presented in the table below. This shows a rise in vapour pressure up to 145 °C. To confirm the result, the sample was re-evacuated and allowed to reach equilibrium again and the vapour pressure determined. This was repeated three times, and the background pressure was determined and subtracted from the vapour pressure. There was no evidence of sample decomposition at the end of the vapour pressure determination.

 

 

Temperature °C

Pressure Pa

 

34.8

0.0931

 

47.5

0.1197

 

69.8

0.1330

 

89.2

0.1862

 

119.9

0.2128

 

144.9

0.2793

 

 

 

 

146.7

0.0532

 

146.6

0.0532

 

147.7

0.0665

 

 

 

Mean values of the previous three results

147.0

0.0576

Background pressure

150.0

0.0399

 

The mean vapour pressure and mean temperature from the last three readings is 147.0 °C and 0.058 Pa, and subtracting the background pressure gives a vapour pressure of 0.018. Since it was not possible to construct a vapour pressure versus temperature plot, an extrapolation to 20 °C was made using the assumption that the slope of the curve is -2000. This is a reasonable assumption, since for solids this is the minimum figure normally seen. From this, the intercept can be calculated in the Clausius-Clapeyron equation, and this equation used to calculate vapour pressure at 20 °C:

Log(0.018) = -2000 x (1/420.15) + C
C = 3.02
Log (VP) = -2000 x (1/293.15) + 3.02

The vapour pressure calculated by this method was below 1.6E-04 Pa at 20 °C.

Conclusions:
The vapour pressure of HAT ISO was measured with a static method according to EU Guideline A 4. The vapour pressure of HAT ISO determined by this method was below 1.6 x 10E-4 Pa at 20 °C.
Executive summary:

Results

Vapour pressures are presented in the table below. This shows a rise in vapour pressure up to 145 °C. To confirm the result, the sample was re-evacuated and allowed to reach equilibrium again and the vapour pressure determined. This was repeated three times, and the background pressure was determined and subtracted from the vapour pressure. There was no evidence of sample decomposition at the end of the vapour pressure determination.

 

 

Temperature °C

Pressure Pa

 

34.8

0.0931

 

47.5

0.1197

 

69.8

0.1330

 

89.2

0.1862

 

119.9

0.2128

 

144.9

0.2793

 

 

 

 

146.7

0.0532

 

146.6

0.0532

 

147.7

0.0665

 

 

 

Mean values of the previous three results

147.0

0.0576

Background pressure

150.0

0.0399

 

The mean vapour pressure and mean temperature from the last three readings is 147.0 °C and 0.058 Pa, and subtracting the background pressure gives a vapour pressure of 0.018. Since it was not possible to construct a vapour pressure versus temperature plot, an extrapolation to 20 °C was made using the assumption that the slope of the curve is -2000. This is a reasonable assumption, since for solids this is the minimum figure normally seen. From this, the intercept can be calculated in the Clausius-Clapeyron equation, and this equation used to calculate vapour pressure at 20 °C:

Log(0.018) = -2000 x (1/420.15) + C
C = 3.02
Log (VP) = -2000 x (1/293.15) + 3.02

The vapour pressure calculated by this method was below 1.6E-04 Pa at 20 °C.

Description of key information

The vapour pressure of HAT ISO was measured with a static method according to EU Guideline A 4. The vapour pressure of HAT ISO determined by this method was below 1.6E-04 Pa at 20 °C (293.15 K).

Key value for chemical safety assessment

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

Additional information