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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
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
guideline study with acceptable restrictions
Remarks:
The study was conducted according to an appropriate test method and in compliance with known quality system (ISO 9001:2008)
Qualifier:
according to
Guideline:
OECD Guideline 102 (Melting point / Melting Range)
Deviations:
no
GLP compliance:
no
Other quality assurance:
other: ISO 9001:2008
Type of method:
thermal analysis
Remarks:
Differential scanning calorimetry (DSC)
Melting / freezing pt.:
< -100 °C
Atm. press.:
101.325 kPa
Decomposition:
no

 

Test

Melting temperature (°C)

1

<-100

2

<-100

Mean value

<-100 (<173K)

Approximate accuracy of equipment: ±0.5 K (up to 600 K)

The DSC diagrams show no exothermic or endothermic peak in the temperature range between –100°C (173 K) and +25°C (298 K).

Therefore a melting temperature or change in the structure of the substance must be at less than –100°C (< 173 K)

Conclusions:
A melting point value of <-100°C at 1013 hPa has been determined for the test substance using a relevant method but not in compliance with GLP. The result is considered to be reliable.
Endpoint:
melting point/freezing point
Type of information:
experimental study
Adequacy of study:
key study
Study period:
2015-03-13
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
guideline study with acceptable restrictions
Remarks:
The study was conducted according to an appropriate test method and in compliance with known quality system (ISO 9001:2008)
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
GLP compliance:
no
Other quality assurance:
other: ISO 9001:2008
Type of method:
differential scanning calorimetry
Key result
Melting / freezing pt.:
< -100 °C
Atm. press.:
101.325 kPa
Decomposition:
no

 

Test

Melting temperature (°C)

1

<-100

2

<-100

Mean value

<-100 (<173 K)

Approximate accuracy of equipment: ±0.5K (up to 600 K)

The DSC diagrams show no exothermic or endothermic peak in the temperature range between –100°C (173 K) and +25°C (298 K).

Therefore a melting temperature or change in the structure of the substance must be at less than –100°C (< 173 K)

Conclusions:
A melting point value of <-100°C at 1013 hPa has been determined for the test substance using a relevant method but not in compliance with GLP. The result is considered to be reliable.

Description of key information

Melting point: <-100°C at 1013 hPa (OECD 102)

Key value for chemical safety assessment

Melting / freezing point at 101 325 Pa:
-100 °C

Additional information

Two reliable measured melting/freezing point studies are available for the substance by the same author (Haas 2015 and Haas 2011). The freezing point of trichloro(propyl)silane has been assessed using Differential Scanning Calorimetry (DSC) according to OECD Test Guideline 102 and in compliance with a known quality system (ISO 9001:2008). The substance has a measured freezing point of <-100°C at 1013 hPa (Haas 2015). Similarly, a melting point of <-100°C was also determined for the registered substance using a DSC method by the same author (Haas 2011). The results are considered to be reliable and the study that is recently conducted is selected as the key study.

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