Orange, sweet, ext.

Melting point / freezing point

Link to relevant study record(s)

Reference

Endpoint:

melting point/freezing point

Type of information:

experimental study

Adequacy of study:

key study

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

study well documented, meets generally accepted scientific principles, acceptable for assessment

Remarks:

Visual observation in line with ECHA guidance documents.

Reason / purpose for cross-reference:

reference to same study

Qualifier:

no guideline followed

Principles of method if other than guideline:

Orange oil is a mixture of substances and transition from liquid to solid will not be sharp. The „Guidance on information requirements and chemical safety assessment Chapter R.7a: Endpoint specific guidance” from ECHA mentions in chapter R7.1.2.3, that «Melting points are not normally carried out for mixtures ». Therefore it is recommended in the NCS protocol „The Registration for REACH of Natural Complex Substances used as Fragrance Ingredients” to describe the state of the essential oil after two days at +5°C and -20 °C rather than determining a transition temperature. As it is common knowledge that citrus oils are liquid at +5 °C only a test at -25 °C was carried out in this examination.

GLP compliance:

no

Type of method:

other: Visual observation

Key result

Melting / freezing pt.:

< -25 °C

Remarks on result:

other: Orange oil is a mixture of substances and transition from liquid to solid will not be sharp. As it is common knowledge that citrus oils are liquid at +5 °C only a test at -25 °C was carried out in this examination. No freezing point could be derived.

Results:

Temperature	+20 °C	-25 °C for 72 h
State of sample	clear mobile liquid	slightly turbid mobile liquid

See also attached photographs.

Conclusions:

Orange oil is a clear mobile liquid at 20ºC and a slightly turbid mobile liquid at -25ºC after 72h.

Executive summary:

Orange oil is a mixture of substances and transition from liquid to solid will not be sharp. The „Guidance on information requirements and chemical safety assessment Chapter R.7a: Endpoint specific guidance” from ECHA mentions in chapter R7.1.2.3, that «Melting points are not normally carried out for mixtures ». Therefore it is recommended in the NCS protocol „The Registration for REACH of Natural Complex Substances used as Fragrance Ingredients” to describe the state of the essential oil after two days at +5°C and -20 °C rather than determining a transition temperature. As it is common knowledge that citrus oils are liquid at +5 °C only a test at -25 °C was carried out in this examination.

Orange oil was found to be a clear mobile liquid at 20 ºC and a slightly turbid mobile liquid at -25 ºC after 72h.

Description of key information

Description of physical state: clear mobile liquid at 20ºC and a slightly turbid mobile liquid at -25ºC after 72h.

Additional information

In a key study according to the NCS protocol, orange oil was found to be a clear mobile liquid at 20 ºC and a slightly turbid mobile liquid at -25 ºC after 72h by visual observation.