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Melting point / freezing point

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melting point/freezing point
Type of information:
experimental study
Adequacy of study:
key study
Study period:
16-17 Dec 2015
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
according to guideline
OECD Guideline 102 (Melting point / Melting Range)
according to guideline
EU Method A.1 (Melting / Freezing Temperature)
GLP compliance:
yes (incl. QA statement)
Rheinland-Pfalz Landesamt für Umwelt, Wasserwirtschaft und Gewerbeaufsicht, Mainz, Germany
Type of method:
method to determine freezing temperature
storage at Super Deep/Deep Freezer
Melting / freezing pt.:
< -20 °C
Atm. press.:
ca. 1 013 hPa

In a pre-test, the test item SP-173 was still liquid after storage for 1 day at –25.4 °C and solidification occurred only at -80 °C. The determination of the melting- / freezing point does not need to be conducted below a lower limit of -20 °C. Therefore, the freezing point is stated as above.

No observations were made which might cause doubts on the validity of the study outcome. Therefore, the result of the study is considered valid.

The following deviation from the study plan was documented: In the pre-test the test item was stored at 7.4 °C instead of 5 °C and

–25.4 °C instead of -20 °C. This is uncritical as the result of the pre-test is clear, because the test item was liquid even at –25.4 °C.

Description of key information

< -20 °C (OECD 102, EU A.1)

Key value for chemical safety assessment

Additional information

The melting point of the substance trihexyl phosphate (CAS No. 2528-39-4) is in the range that allows estimation that it is very low (below -20 °C).