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Diss Factsheets

Administrative data

Endpoint:
vapour pressure
Type of information:
experimental study
Adequacy of study:
key study
Study period:
1999-02-03 to 1999-02-04
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
other: GLP study according to EU test method

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
1999
Report date:
1999

Materials and methods

Test guideline
Qualifier:
according to guideline
Guideline:
EU Method A.4 (Vapour Pressure)
Deviations:
no
GLP compliance:
yes
Type of method:
effusion method: vapour pressure balance

Test material

Constituent 1
Details on test material:
- Name of test material (as cited in study report): Reaktiv-Orange DYPR934

Results and discussion

Vapour pressureopen allclose all
Temp.:
25 °C
Vapour pressure:
< 0 hPa
Remarks on result:
other: Vapour pressure value at 25°C is below 1 x 10-5hPa
Temp.:
20 °C
Vapour pressure:
0 hPa
Remarks on result:
other: Estimated vapour pressure value.

Any other information on results incl. tables

The vapour pressure of the pure substance is than close to or below the detection limit.

For calculating the vapour pressure the average molecular mass of an 1:1 mixture of the free acid was taken. Because the Li-Na relation is known, the” exact “molecular mass cannot be given. The lower molecular mass of the free acids leads to a more conservative result.

 

Temperature (°C)

Vapour pressure (hPa)

66.7

4.0 x 10-5

74.1

1.0 x 10-4

75.2

1.5 x 10-4

80.1

2.0 x 10-4

84.2

7.5 x 10-5

90.6

5.3 x 10-5

95.8

3.1 x 10-5

100.2

3.5 x 10-5

105.5

4.7 x 10-5

119.1

2.0 x 10-5

123.2

2.8 x 10-5

131.1

2.8 x 10-5

134.8

5.6 x 10-5

139.7

2.4 x 10-5

149.7

4.5 x 10-5

150.0

4.5 x 10-5

 

Vapour pressure value at 25°C is below 1 x 10-5hPa

Applicant's summary and conclusion

Conclusions:
The vapour pressure of the pure substance is than chose or below detection limit.
For calculating the vapour pressure the average molecular mass of an 1:1 mixture of the free acids was taken. Because the Li-Na-relation is not known, the “exact” molecular mass cannot be given. The lower molecular mass of the free acids leads to a more conservative result.
Temperature (°C) Vapour pressure (hPa)
66.7 4.0 x 10-5
74.1 1.0 x 10-4
75.2 1.5 x 10-4
80.1 2.0 x 10-4
84.2 7.5 x 10-5
90.6 5.3 x 10-5
95.8 3.1 x 10-5
100.2 3.5 x 10-5
105.5 4.7 x 10-5
119.1 2.0 x 10-5
123.2 2.8 x 10-5
131.1 2.8 x 10-5
134.8 5.6 x 10-5
139.7 2.4 x 10-5
149.7 4.5 x 10-5
150.0 4.5 x 10-5

Vapour pressure value for 25°C is below 1 x 10-5 hPa

Executive summary:

In order to determine the vapour pressure of Reaktiv-Orange DYPR 934 all volatile components were removed from the test substance by treating under vacuum over night at room temperature before the measurement.

As a precaution a Differential Scanning Calorimetry was performed. The measurement in a closed glass shows an exothermal effect at 125 °C followed by a second one at 230 °C.

The vapour pressure was first measured at a temperature of 21 °C. At about 60 °C the vapour pressure of the test substance was above the lower measurement limit.

Although the test substance was dried over night under the vacuum it cannot be excluded that residual water gave a misleading vapour pressure with increasing temperature and a scatter of the data.

The vapour pressure of the pure substance is than close to or below the detection limit.

For calculating the vapour pressure, the average molecular mass of an 1:1 mixture of the free acids was taken. Because the Li-Na-relation is not known, the "exact" molecular mass cannot be given.

Hence the vapour pressure value for 25 °C is below 1 x 10-5 hPa