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Physical & Chemical properties

Melting point / freezing point

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Endpoint:
melting point/freezing point
Type of information:
experimental study
Adequacy of study:
supporting study
Study period:
2011
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
study well documented, meets generally accepted scientific principles, acceptable for assessment
Qualifier:
no guideline followed
Principles of method if other than guideline:
Direct observation at increasing temperatures.
GLP compliance:
no
Type of method:
pour point
Specific details on test material used for the study:
HFE L-21343
Key result
Melting / freezing pt.:
-50 °C
Decomposition:
no
Remarks on result:
other: ± 3 °C
Conclusions:
Novec 7700 has a melting point (pour point) of -50 °C (± 3 °C).
Executive summary:

Novec 7700 has a melting point (pour point) of -50 °C (± 3 °C). The study was well-documented and meets generally accepted scientific principles but was not conducted in accord with GLP guidelines; therefore the result is considered reliable with restrictions.

Endpoint:
melting point/freezing point
Type of information:
experimental study
Adequacy of study:
key study
Study period:
12 Oct - 18 Oct 2016
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to
Guideline:
OECD Guideline 102 (Melting point / Melting Range)
Deviations:
no
Qualifier:
according to
Guideline:
EU Method A.1 (Melting / Freezing Temperature)
Deviations:
no
Qualifier:
according to
Guideline:
EPA OPPTS 830.7200 (Melting Point / Melting Range)
Deviations:
no
GLP compliance:
yes
Type of method:
method to determine freezing temperature
Specific details on test material used for the study:
SOURCE OF TEST MATERIAL
- Source and lot/batch No.of test material: Lot # 20003, unit 0022
- Physical state: Clear colourless liquid
- Analytical purity: 99.7%
- Expiration date of the lot/batch: 30 March 2018

STABILITY AND STORAGE CONDITIONS OF TEST MATERIAL
- Storage condition of test material: at room temperature
Key result
Melting / freezing pt.:
< -80 °C
Decomposition:
no

During initial cooling of experiment 1, no thermal effects were observed. To further investigate the melting temperature of the test item, two subsamples of the test item were stored for 19 hours at -23.5 ± 0.3 °C and at -82.3 ± 2.1 °C respectively. It was observed after storage that the test item was a liquid (- 20 °C freezer) and a viscous liquid (- 80 °C freezer).

Conclusions:
The melting point of < -80 °C was observed for Novec 7700 as determined by the OECD 102 method.
Executive summary:

After 19 hours of storage in an ultra-low freezer at -82.3 °C ± 2.1 °C it was visually observed that the test substance was a viscous liquid. Based on this it was concluded that the melting temperature of the test substance is < -80 °C. The study was conducted in accordance with the OECD 102 method and was GLP compliant; therefore the study is considered reliable without restrictions.

Description of key information

The melting point of Novec 7700 was determined to be < -80 °C (OECD 102 method).

Key value for chemical safety assessment

Additional information

In the key study, after 19 hours of storage in an ultra-low freezer at -82.3 °C ± 2.1 °C it was visually observed that the test substance was a viscous liquid. The study was conducted in accordance with OECD 102 and was GLP compliant; therefore the study is considered reliable without restrictions. In a supporting study, a melting point (pour point) of -50 °C (± 3 °C) was reported for Novec 7700. The study was well-documented and meets generally accepted scientific principles but was not conducted in accord with GLP guidelines; therefore the result is considered reliable with restrictions. The reason for the discrepany is not known, however both results are well below environmentally relevant temperatures.