Registration Dossier

Diss Factsheets

Physical & Chemical properties

Melting point / freezing point

Currently viewing:

Administrative data

Link to relevant study record(s)

Reference
Endpoint:
melting point/freezing point
Type of information:
experimental study
Adequacy of study:
key study
Study period:
2016-02-02 to 2016-02-05
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
EU Method A.1 (Melting / Freezing Temperature)
Version / remarks:
Melting/Freezing Temperature”, Official Journal of the European Union no. L142, May 31, 2008
Deviations:
no
Qualifier:
according to guideline
Guideline:
OECD Guideline 102 (Melting point / Melting Range)
Version / remarks:
Melting Point / Melting Range", July 27, 1995
Deviations:
no
Qualifier:
according to guideline
Guideline:
EPA OPPTS 830.7200 (Melting Point / Melting Range)
Version / remarks:
Melting Point/Melting Range", March 1998
Deviations:
no
GLP compliance:
yes
Type of method:
method to determine freezing temperature
Key result
Melting / freezing pt.:
< -80 °C
Atm. press.:
1 013 hPa

Preliminary test


The TGA-curve of the test item is shown in Figure 1 (attached). From 150 °C upwards the weight of the sample decreased significantly. At 212 °C the sample weight had decreased by 25 %.


 


After the experiment it was observed that the test item had completely evaporated from the sample container.


 


Main study


The DSC-curve obtained is shown in Figure 2 (attached). No effects were observed during heating and cooling which could be attributed to crystallization and/or melting of the test item (results of the cooling are archived in the raw data). After the experiment, no changes in the appearance of the test item were observed.


 


To further investigate the melting temperature of the test item, two subsamples of the test item were stored for 24 hours; one subsample at -22.5 ± 0.8 °C and the other at -83.3 ± 2.2 °C. It was observed after storage that the test item was a liquid (-20 °C freezer) and a viscous liquid (-80 °C freezer). According to this it was concluded that the melting temperature of the test item is < -80 °C (< 193K).


 


Conclusion


The melting temperature of 3-trimethoxysilylpropane-1-thiol was determined to be < -80 °C (< 193K) based on a storage experiment in the freezer.


 


 

Conclusions:
A freezing temperature value of < -80 °C (< 193 K) at 1013 hPa was obtained for the substance using a relevant test method and in compliance with GLP. The result is considered to be reliable.

Description of key information

Freezing point: < -80 °C at 1013 hPa (OECD 102)

Key value for chemical safety assessment

Melting / freezing point at 101 325 Pa:
-80 °C

Additional information

A freezing temperature value of < -80 °C at 1013 hPa was obtained for the substance using a relevant test method and in compliance with GLP. The result is considered to be reliable and is selected as key study.


 


In a secondary source to which reliability could not be assigned, a melting point value of < 0 °C at 1013 hPa was reported for the substance.