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Physical & Chemical properties

Boiling point

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Endpoint:
boiling point
Type of information:
not specified
Adequacy of study:
weight of evidence
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
data from handbook or collection of data
Remarks:
Data comes from an online compilation using secondary data sources. There is no experimental study reference, however data is cited in the database as peer reviewed. Therefore it is considered as reliable, but with restrictions due to lack of details.
Reason / purpose for cross-reference:
reference to same study
Reason / purpose for cross-reference:
reference to other study
Principles of method if other than guideline:
No data.
Boiling pt.:
176.4 °C
Atm. press.:
ca. 101 325 Pa

Atmospheric pressure not specified but assumed to be ambient.

Executive summary:

The HSDB database provides, as secondary source, some physico-chemical properties. A boiling point of 176.4°C is cited for cineole.

Endpoint:
boiling point
Type of information:
not specified
Adequacy of study:
weight of evidence
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
data from handbook or collection of data
Remarks:
Data comes from an online compilation using secondary data sources. There is no experimental study reference, however data is cited in the database as peer reviewed. Therefore it is considered as reliable, but with restrictions due to lack of details.
Reason / purpose for cross-reference:
reference to same study
Reason / purpose for cross-reference:
reference to other study
Principles of method if other than guideline:
No data.
Boiling pt.:
156 °C
Atm. press.:
760 mm Hg
Executive summary:

The HSDB database provides, as secondary source, some physico-chemical properties. A boiling point of 156°C under normal atmospheric pressure is cited for alpha-pinene.

Endpoint:
boiling point
Type of information:
experimental study
Adequacy of study:
key study
Study period:
2013-03-14
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Remarks:
The study has been conducted according to internationally recognised guideline. Minor deviation is not considered to impact reliability. The substance is adequately caracterised. Therefore full validation applies.
Reason / purpose for cross-reference:
reference to same study
Reason / purpose for cross-reference:
reference to other study
Qualifier:
according to guideline
Guideline:
OECD Guideline 103 (Boiling point/boiling range)
Deviations:
yes
Remarks:
single run
GLP compliance:
no
Type of method:
distillation method
Key result
Boiling pt.:
>= 153 - <= 184 °C
Atm. press.:
101 kPa

Atmospheric pressure during experiment was 101.0 kPa.

Details of distillation (values and curves) are provided in the experimental report.

The following observations were made:

- The sample started to boil at a bottom temperature of 158°C

- First distillate was obtained at head temperature of 153°C

- Head temperature reached a plateau around 184°C

- Bottom temperature continued to rise due to composition change.

 

This range covers the values for the individual main components (data source: Arctander 1969):

alpha-pinene: b.p. = 156 - 158°C

Cineole (eucalyptol): b.p. = 174 - 176°C

Limonene: b.p. = 176 - 178°C

However, when % of distillate is plotted vs temperature, it can be observed that the major amounts are collected between 163 and 171 -174°C, suggesting that the very major component Cineole tends to recondensate at lower temperature from the oil than b.p. as pure.

Conclusions:
The distillation range covers the individual values for the main components, with the very major one (cineole) recondensating in a 10°C-interval below its boiling point as pure.
Executive summary:

The boiling range of the test substance was measured according to OECD 103, distillation method. A single run was performed, and the observed range was compared to individual values for the major components. Results fit, and the experimental range between 153 and 184°C is retained.

Description of key information

Distillation is expected to occur in the same range of ca 153 to 184°C for both crude and rectified qualities, with slight variation in the collection of the major fraction.

Key value for chemical safety assessment

Additional information

An experimental study is available for the crude quality, showing that the distillation range covers the values of the individual components, especially the two showing the highest variation in the composition (i.e. cineole, increase by ca +20%, and alpha-pinene, decrease by ca -18%, having b.p. respectively of 176.4°C and 156°, based on litterature data). Therefore, the same range is anticipated for the rectified quality. Moreover, the very major component (cineole) was observed to recondensate ca 5 - 10°C below its boiling point from the crude oil; the difference for this fraction should be less significant from the rectified quality, due to higher concentration.

Results expressed as a range cannot be retained as key data for purpose of CSA.

It should be noted that due to UVCB nature of the substance, batch variations are expected.