Polysulfides, bis[3-(triethoxysilyl)propyl]

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

Study period:

2015-01-21 to 2015-01-22

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Remarks:

The study was conducted in accordance with a relevant test method and in compliance with a known quality system (ISO 17025).

Qualifier:

according to guideline

Guideline:

OECD Guideline 102 (Melting point / Melting Range)

Qualifier:

according to guideline

Guideline:

EU Method A.1 (Melting / Freezing Temperature)

GLP compliance:

no

Other quality assurance:

ISO/IEC 17025 (General requirements for the competence of testing and calibration laboratories)

Type of method:

differential scanning calorimetry

Key result

Melting / freezing pt.:

ca. -20 °C

Atm. press.:

1 013 hPa

Remarks on result:

other: The freezing point of the substance was obtained to be <-20°C with a glass transition observed at -113°C

The DSC measurements were performed twice. After cooling to -150°C at a rate of 2 K/min, the sample was heated to 50°C at a rate of 5 K/min. The cooling as well as the heating curve show only a glass transition, indicating that the test item had solidified amorphously.

No other thermal effect from crystallisation or melting was registered upon further heating.

Melting temperature: No melting point was found between -150 and +50°C under these conditions. A glass transition was observed at -113°C.

The DSC curves are attached.

Conclusions:

A melting point of <-20°C at 1013 hPa was obtained for the substance with a glass transition observed at -113°C. The result is considered to be reliable.

Description of key information

Melting point: < -20°C at 1013 hPa (OECD 102)

Key value for chemical safety assessment

Melting / freezing point at 101 325 Pa:

-20 °C

Additional information

The freezing point of the substance has been determined using a differential scanning calorimetry (DSC) method in accordance with OECD Test Guideline 102 and in compliance with a known quality system (ISO 17025). Cooling of the sample was performed to -150°C at a rate of 2 K/min, then the test sample was heated to 50°C at a rate of 5 K/min. Under the conditions of the study, no melting point was found between -150°C and 50°C, but a glass transition was observed at -113°C. Therefore, the melting point of the substance was interpreted as < -20°C at 1013 hPa. The result is considered to be reliable and is selected as key study.

 

In available secondary sources to which reliability could not be assigned, a melting point value of approximately -80°C and a limit of < -78°C were reported for the substance.