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Physical & Chemical properties

Melting point / freezing point

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Endpoint:
melting point/freezing 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:
reference to same study
Reason / purpose:
reference to other study
Principles of method if other than guideline:
No data.
Melting / freezing pt.:
1.5 °C
Executive summary:

The HSDB database provides, as secondary source, some physico-chemical properties. A melting/freezing point of 1.5°C is cited for cineole.

Endpoint:
melting point/freezing 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:
reference to same study
Reason / purpose:
reference to other study
Principles of method if other than guideline:
No data.
Melting / freezing pt.:
-62.5 °C
Executive summary:

The HSDB database provides, as secondary source, some physico-chemical properties. A melting/freezing point of -62.5°C is cited for alpha-pinene.

Endpoint:
melting point/freezing point
Type of information:
experimental study
Adequacy of study:
key study
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
comparable to guideline study
Remarks:
The study has been conducted according to guidance on NCS. The substance is adequately caracterised. Therefore full validation applies.
Reason / purpose:
reference to same study
Qualifier:
according to
Guideline:
other: EFFA/EFEO guideline "The Registration for REACH of Natural Complex Substances used as Fragrance Ingredients"
GLP compliance:
no
Type of method:
other: Visual observation after equilibrium at +5°C and -20°C.
Key result
Melting / freezing pt.:
< -20 °C

Temperature

+20°C

+5°C for 48h

-20°C for 48h

State of sample 1

clear mobile liquid

clear mobile liquid

clear mobile liquid

State of sample 2

clear mobile liquid

clear mobile liquid

clear mobile liquid

 

The state of the sample and the colour have remained unchanged.

Viscosity increased at the lowest temperature.

Conclusions:
Freezing point < -20°C.
No further testing required.
Executive summary:

The physical state of the test substance was observed after 2-day equilibration at +5°C and -20°C, according to EFFA/EFEO Recommendations for NCS. The sample remained liquid.

Description of key information

Crude quality: Freezing point < -20°C (exp.).

Rectified quality: Freezing point anticipated < +5°C (extrap.).

Key value for chemical safety assessment

Additional information

An experimental study is available for the crude quality, based on observation at given temperatures (+5°C and -20°C), as recommended for NCS: the substance remained liquid at the lowest temperature tested.

For the rectified quality, literature data for the two components showing the highest variation in the composition (i.e. cineole, m.p.=1.5°C, increase by ca +20%, and alpha-pinene, m.p.=-62.5°C, decrease by ca -18%) show that increase of freezing point is anticipated. However, based on these values, it is expected to remain at least below the testing threshold of +5°C.

Results expressed as limit values 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.