Ethane

Vapour pressure

Link to relevant study record(s)

Reference

Reference 1

Endpoint:

vapour pressure

Type of information:

experimental study

Adequacy of study:

key study

Study period:

Up to 2008

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

other: Non-GLP, non-guideline, Information from published handbook, acceptable with restrictions.

Principles of method if other than guideline:

The use of secondary sources of data is acceptable when they are based on a critical evaluation of peer-reviewed data and a consequent selection of a reliable and representative value for the property under investigation. The introduction to the CRC Handbook of Chemistry and Physics states that data for physical constants have been taken from many sources, including both compilations and the primary literature. Where conflicts were found, the value deemed most reliable was chosen. Therefore, although the method used is not known, the values presented here are acceptable as they are from a reliable secondary source of phys chem. data.

GLP compliance:

not specified

Remarks:

No data reported

Type of method:

other: No data reported

Specific details on test material used for the study:

N/A

Temp.:

-0.8 °C

Vapour pressure:

100 kPa

Temp.:

25 °C

Vapour pressure:

677 kPa

Remarks on result:

other: Calculated for standard temperature from 100 kPa at -0.8°C

Key result

Temp.:

21.85 °C

Vapour pressure:

221 kPa

Remarks on result:

other: Vapour pressure of fluids at temperatures below 300 K

Temp.:

26.85 °C

Vapour pressure:

258 kPa

Remarks on result:

other: Vapour pressure of fluids at temperatures below 300 K

N/A

Conclusions:

The vapour pressure of butane is 221 kPa at 22°C.

Executive summary:

The vapour pressure of butane is 221 kPa at 22°C. This information is taken from a reliable peer reviewed handbook and so can be considered reliable and suitable for use for this endpoint.

Reference 2

Endpoint:

vapour pressure

Type of information:

experimental study

Adequacy of study:

key study

Study period:

Up to 2008

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

other: GLP status not known, guideline not known, information from a published handbook, acceptable with restrictions

Principles of method if other than guideline:

The use of secondary sources of data is acceptable when they are based on a critical evaluation of peer-reviewed data and a consequent selection of a reliable and representative value for the property under investigation. The introduction to the CRC Handbook of Chemistry and Physics states that data for physical constants have been taken from many sources, including both compilations and the primary literature. Where conflicts were found, the value deemed most reliable was chosen. Therefore, although the method used is not known, the values presented here are acceptable as they are from a reliable secondary source of phys chem. data.

GLP compliance:

not specified

Type of method:

other: Method not known

Specific details on test material used for the study:

N/A

Temp.:

-88.8 °C

Vapour pressure:

100 kPa

Temp.:

25 °C

Vapour pressure:

26 000 000 kPa

Remarks on result:

other: Calculated to standard temperature from 100 kP at -88.8°C

Key result

Temp.:

21.85 °C

Vapour pressure:

3 917 kPa

Remarks on result:

other: Vapour pressure of fluids at temperatures below 300 K

Temp.:

26.85 °C

Vapour pressure:

4 355 kPa

Remarks on result:

other: Vapour pressure of fluids at temperatures below 300 K

N/A

Conclusions:

The vapour pressure of ethane at 22°C is 3917 kPa.

Executive summary:

No information on the primary source of the data or the methods used is available. However, this information is taken from a reliable peer reviewed handbook and so can be considered reliable and suitable for use for this endpoint. Most up to date source at the time. The vapour pressure of ethane at 22°C is 3917 kPa.

Reference 3

Endpoint:

vapour pressure

Type of information:

experimental study

Adequacy of study:

key study

Study period:

Up to 2008

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

other: Non-GLP, non-guideline, Information from published handbook, acceptable with restrictions.

Principles of method if other than guideline:

The use of secondary sources of data is acceptable when they are based on a critical evaluation of peer-reviewed data and a consequent selection of a reliable and representative value for the property under investigation. The introduction to the CRC Handbook of Chemistry and Physics states that data for physical constants have been taken from many sources, including both compilations and the primary literature. Where conflicts were found, the value deemed most reliable was chosen. Therefore, although the method used is not known, the values presented here are acceptable as they are from a reliable secondary source of phys chem. data.

GLP compliance:

not specified

Remarks:

No data reported

Type of method:

other: No data reported

Specific details on test material used for the study:

N/A

Temp.:

-12 °C

Vapour pressure:

100 kPa

Temp.:

25 °C

Vapour pressure:

1 750 kPa

Remarks on result:

other: Calculated for standard temperature from 100 kPa at -12°C

Key result

Temp.:

21.85 °C

Vapour pressure:

319 kPa

Remarks on result:

other: Vapour pressure of fluids at temperatures below 300 K

Temp.:

26.85 °C

Vapour pressure:

370 kPa

Remarks on result:

other: Vapour pressure of fluids at temperatures below 300 K

N/A

Conclusions:

The vapour pressure of isobutane is 319 kPa at 22°C.

Executive summary:

The vapour pressure of isobutane is 319 kPa at 22°C. This information is taken from a reliable peer reviewed handbook and so can be considered reliable and suitable for use for this endpoint.

Reference 4

Endpoint:

vapour pressure

Type of information:

experimental study

Adequacy of study:

key study

Study period:

Up to 2008

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

other: Non-GLP, non-guideline, Information from published handbook, acceptable with restrictions.

Principles of method if other than guideline:

The use of secondary sources of data is acceptable when they are based on a critical evaluation of peer-reviewed data and a consequent selection of a reliable and representative value for the property under investigation. The introduction to the CRC Handbook of Chemistry and Physics states that data for physical constants have been taken from many sources, including both compilations and the primary literature. Where conflicts were found, the value deemed most reliable was chosen. Therefore, although the method used is not known, the values presented here are acceptable as they are from a reliable secondary source of phys chem. data.

GLP compliance:

not specified

Type of method:

other: No data reported

Specific details on test material used for the study:

N/A

Temp.:

-161.7 °C

Vapour pressure:

100 kPa

Temp.:

25 °C

Vapour pressure:

50 400 000 000 000 000 kPa

Remarks on result:

other: Calculated for standard temperature from 100 kPa at -161.7°C: 5.04E+19 Pa

Temp.:

-83.15 °C

Vapour pressure:

4 520 kPa

Remarks on result:

other: Vapour pressure of fluids at temperatures below 300 K.

Key result

Temp.:

25 °C

Vapour pressure:

445 000 000 kPa

Remarks on result:

other: Calculated for standard temperature from 4520 kPa at -83.15°C: 4.45 E+11 Pa

N/A

Conclusions:

The vapour pressure of methane is 4.45 E+11 Pa at 25˚C

Executive summary:

The vapour pressure of methane is 4.45 E+11 Pa at 25˚C. This information is taken from a reliable peer reviewed handbook and so can be considered reliable and suitable for use for this endpoint.

Reference 5

Endpoint:

vapour pressure

Type of information:

experimental study

Adequacy of study:

key study

Study period:

Up to 2008

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

other: Non-GLP, non-guideline, Information from published handbook, acceptable with restrictions.

Principles of method if other than guideline:

The use of secondary sources of data is acceptable when they are based on a critical evaluation of peer-reviewed data and a consequent selection of a reliable and representative value for the property under investigation. The introduction to the CRC Handbook of Chemistry and Physics states that data for physical constants have been taken from many sources, including both compilations and the primary literature. Where conflicts were found, the value deemed most reliable was chosen. Therefore, although the method used is not known, the values presented here are acceptable as they are from a reliable secondary source of phys chem. data.

GLP compliance:

not specified

Remarks:

No data reported

Type of method:

other: No data reported

Specific details on test material used for the study:

N/A

Temp.:

-42.3 °C

Vapour pressure:

100 kPa

Temp.:

25 °C

Vapour pressure:

36 000 kPa

Remarks on result:

other: Calculated for standard temperature from 100 kPa at -42.3°C

Key result

Temp.:

21.85 °C

Vapour pressure:

878 kPa

Remarks on result:

other: Vapour pressure of fluids at temperatures below 300 K

Temp.:

26.85 °C

Vapour pressure:

998 kPa

Remarks on result:

other: Vapour pressure of fluids at temperatures below 300 K

N/A

Conclusions:

The vapour pressure of propane is 878 kPa at 22°C.

Executive summary:

The vapour pressure of propane is 878 kPa at 22°C. This information is taken from a reliable peer reviewed handbook and so can be considered reliable and suitable for use for this endpoint.

Description of key information

The vapour pressure of the substances in the category ranges from 143 kPa at 20°C to 4520 kPa at -83°C.

Key value for chemical safety assessment

Vapour pressure:

1 971 kPa

at the temperature of:

22 °C

Additional information

In accordance with section 2 of REACH Annex XI and Chapter R7a: endpoint specific guidance, the vapour pressure study does not need to be conducted as this substance has a boiling point less than 30°C, and therefore will have a vapour pressure above the limit of measurement (10^5 Pa).

Data are available for 95465-89-7 from a proprietary study conducted according to standard guidelines (Repsol 2009). Data from the CRC handbook (Lide 2008) were available for the substances methane, ethane, propane, butane and isobutane. The information is taken from a reliable peer reviewed handbook and so can be considered reliable and suitable for use for this endpoint.

The vapour pressure of methane is 4520 kPa at -83˚C, ethane is 3917 kPa at 22˚C, propane is 878 kPa at 22°C, butane is 221 kPa at 22°C and isobutane is 319 kPa at 22°C. The mean of the vapour pressure values for the category is 1971 kPa at 25°C and this has been used to complete the 'key value for chemical safety assessment'.