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Physical & Chemical properties

Vapour pressure

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Endpoint:
vapour pressure
Type of information:
experimental study
Adequacy of study:
supporting study
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: Value obtained from a recognised source of physico-chemical data. This reference is considered as definitive for vapour pressure values.
Principles of method if other than guideline:
No details are available on the guideline used to determine this result.
GLP compliance:
not specified
Temp.:
25 °C
Vapour pressure:
0.004 hPa
Conclusions:
A vapour pressure value of 0.39 Pa at 25ºC is reported in a collection of reliable data which has been subject to peer-review. The result is considered to be reliable.
Endpoint:
vapour pressure
Type of information:
experimental study
Adequacy of study:
key study
Study period:
2009/05/11
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: Test procedure in accordance with national standard methods (NFT) without GLP.
Qualifier:
according to guideline
Guideline:
other: NFT 20-048
GLP compliance:
no
Type of method:
isoteniscope
Temp.:
20 °C
Vapour pressure:
< 5 Pa
Temp.:
40 °C
Vapour pressure:
7 Pa
Remarks on result:
other: Calculated from the regression equation

Measurement (repeat determination)

Temperature in °C: 20.0 / 20.0

Vapour pressure in Pa: <5 / <5

Temperature in °C: 50.0 / 50.0

Vapour pressure in Pa: 8 / 6

Average vapour pressure in Pa: 7

Conclusions:
Vapour pressure of undecan-1-ol: < 5 Pa at 20 °C and 7 Pa at 40 °C.
Executive summary:
 Measurement  1  2
 Temperature in °C  20.0 40.0
 Vapour Pressure in Pa  <5 7
Endpoint:
vapour pressure
Type of information:
experimental study
Adequacy of study:
key study
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: Test procedure in accordance with national standard methods (NFT) without GLP.
Qualifier:
according to guideline
Guideline:
other: NFT 20-048
GLP compliance:
no
Type of method:
static method
Remarks:
NFT 20-048
Temp.:
ca. 20 °C
Vapour pressure:
< 5 Pa
Temp.:
ca. 50 °C
Vapour pressure:
< 5 Pa

MEASUREMENT

TEMPERATURE (°C):20 °C / 50 °C

VAPOUR PRESSURE (Pa)1st TEST:< 5 / < 5

VAPOUR PRESSURE (Pa) 2nd TEST:< 5 / < 5

VAPOUR PRESSURE (Pa) AVERAGE:< 5 / < 5

Executive summary:
 Measurement  1  2
 Temperature in °C  20.0  50.0
 Vapour Pressure in Pa  <5  <5

Description of key information

The vapour pressure of a commercial sample of undecan-1-ol is <5 Pa at 20°C. A value of ca. 7 Pa at 40°C was was reported in the same study. A consistent and reliable measurement of 0.39 Pa at 25°C using a highly pure sample is available (Daubert and Danner, 1989).

Key value for chemical safety assessment

Vapour pressure:
0.39 Pa
at the temperature of:
25 °C

Additional information

The vapour pressure of <5 Pa at 20°C was determined in a reliable study.

A value of ca. 7 Pa at 40°C was was reported in the same study. A consistent and reliable measurement of 0.39 Pa at 25°C using a highly pure sample is available (Daubert and Danner, 1989).

The quantified value at ambient temperature from Daubert and Danner is used in environmental modelling.

Discussion of trends in the Category of C6-24 linear and essentially-linear aliphatic alcohols

As chain length increases, vapour pressure decreases. This is because molecular weight is higher and

intermolecular forces in the substance are all higher.