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Melting point / freezing point

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Reference
Endpoint:
melting point/freezing point
Type of information:
experimental study
Adequacy of study:
key study
Study period:
2012
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
study well documented, meets generally accepted scientific principles, acceptable for assessment
Qualifier:
no guideline required
Principles of method if other than guideline:
Melting point/range:
Equipment:
SRS OptiMelt MPA100
Conditions:
Start temp: 50.0oC
Stop temp: 80.0oC
Rate: 1.0C/minute

Differential scanning calorimeter
(DSC)

Mettler Toledo AG - DSC823e


Conditions:
Sample weight: ~11mg
Start temp: 35.0C
Rate: 10.0oC/minute
Gas: N2
GLP compliance:
no
Type of method:
differential scanning calorimetry
Key result
Melting / freezing pt.:
75.8 - 79.5 °C
Atm. press.:
1 atm
Decomposition:
no
Sublimation:
no
Remarks on result:
other: A glass transition of oligomeric mixture

Optical Melting determination:Range: 75.8-79.5 Point: 77.5 The thermogram shows aendothermicphase transitionfrom solid to liquid (lined peak). Onset result is more specifically related to the physically change -Melting Point since it is not influenced by sample size and scan rate.   Onset: 71.93°CMax Peak: 74.10°C

Conclusions:
The substance is an oligomeric mixture. A glass transition of the oligomeric mixture was determined.
Optical Melting determination: Range 75.8-79.5
Point: 77.5
The thermogram shows a endothermic phase transition from solid to liquid (lined peak).
Onset result is more specifically related to the physically change -Melting Point since it is not influenced by sample size and scan rate.
Onset: 71.93C
Max Peak: 74.10C

Executive summary:

Optical Melting determination:

Point: 77.5

Range 75.8-79.5

The thermogram shows a endothermic phase transition from solid to liquid (lined peak).

Onset result is more specifically related to the physically change -Melting Point since it is not influenced by sample size and scan rate.

Onset: 71.93C

Max Peak: 74.10C

Description of key information

A glass transition of the oligomeric mixture has been determined as 75.8 -79.5°C.

Key value for chemical safety assessment

Melting / freezing point at 101 325 Pa:
77.5 °C

Additional information

MP determination has been conducted using SRS OptiMelt MPA100 under the following conditions: start temp 50 °C, stop temp 80 °C with rate of 1C/minute. Optical melting range determination: 75.8 -79.5 °C, Point 77.5 °C.

Differential; scanning calorimeter has been conducted as well using Mettler Toledo AG-DSC 823e. The thermogram shows aendothermicphase transitionfrom solid to liquid . Onset result is more specifically related to the physically change -Melting Point since it is not influenced by sample size and scan rate.Onset: 71.93°C, Max Peak 74.10°C.