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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

Diss Factsheets

Administrative data

Endpoint:
vapour pressure
Type of information:
experimental study
Adequacy of study:
supporting study
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
comparable to guideline study

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
1985
Report date:
1985

Materials and methods

Test guideline
Qualifier:
equivalent or similar to guideline
Guideline:
OECD Guideline 104 (Vapour Pressure Curve)
GLP compliance:
no
Type of method:
dynamic method

Test material

Constituent 1
Chemical structure
Reference substance name:
Pivalic acid
EC Number:
200-922-5
EC Name:
Pivalic acid
Cas Number:
75-98-9
Molecular formula:
C5H10O2
IUPAC Name:
2,2-dimethylpropanoic acid
Test material form:
solid

Results and discussion

Vapour pressure
Temp.:
35.74 °C
Vapour pressure:
2 hPa
Vapour pressure at 50°C (if relevant for classification of gas under pressure)
Vapour pressure:
5.507 hPa
Remarks on result:
other: calculated from the regression equation.

Any other information on results incl. tables

Result

Temperature

[°C]

Vapour pressure

 (measurement)

[hPa]

Vapour pressure

 (calculation)

[hPa]

Aberration

[%]

35.74

2.00

2.01

0.5

41.11

3.00

2.98

-0.7

48.48

5.00

4.97

-0.5

53.64

7.00

6.99

-0.1

59.42

10.00

10.08

0.8

71.03

20.00

20.05

0.2

78.37

30.00

30.05

0.2

88.12

50.00

49.82

-0.4

95.20

70.00

70.42

0.6

102.55

100.0

99.15

-0.9

118.95

200.0

200.9

0.4

129.12

300.0

300.4

0.1

142.88

500.0

498.6

-0.3

152.61

700.0

696.1

-0.6

164.01

1001.2

1006

0.5

164.23

-

1013.25

-

The regression of the results leads to the following equation:

ln(p/hPa) = 11.3568 - 4114.45 / (198.48 + t/°C)

The vapour pressure at 50°C was calculated from the regression equation.

The vapor pressure at 20 ° C and 25 ° C could not be calculated because the melting point for the substance is 36 ° C and thus would lead on a change of state on the regression curve.

The normal boiling temperature was obtained by intrapolation/extrapolation from the vapour pressure curve.

Applicant's summary and conclusion