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Physical & Chemical properties

Melting point / freezing point

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Reference
Endpoint:
melting point/freezing point
Type of information:
read-across from supporting substance (structural analogue or surrogate)
Adequacy of study:
key study
Justification for type of information:
The freezing point of the source (1,4-H6XDI) is considered to be identical to the target (1,3-H6XDI) based on highly similar chemical structures.
Reason / purpose:
read-across source
Key result
Melting / freezing pt.:
0 °C
Atm. press.:
>= 1 007 - <= 1 011 hPa

DSC EXPERIMENT 1

-Endothermic peak between -50°C and 50°C with extrapolated onset temperature of -0.31°C.

-Endothermic effect between 150°C and 325°C with extrapolated onset temperature of 254.96°C.

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

DSC EXPERIMENT 2

To investigate the peak between -50°C and 50°C a repeated heating cycle (as well as a hermetic sealed sample pan to investigate the effect between 150°C and 325°C) was applied. With the first heating the extrapolated onset temperature was -0.33°C. The similar value indicated that melting of the test item was the reason for the effect. During cooling an exothermic peak was observed between -20°C and -40°C, due to crystallization of the test item.

With the second heating an extrapolated onset temperature of 0.09°C was obtained. The results confirmed that the endothermic effect was due to melting of the test item.

The extrapolated onset temperature of the second effect was 305.02°C. As can be seen the endothermic peak shifted to higher temperatures. It demonstrated that evaporation of the test item was the reason for the endothermic effect.

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

DSC EXPERIMENT 3

The temperature program was similar as the program of Experiment 1 and similar results were obtained. Extrapolated onset temperatures: -0.68°C and 254.97°C.

DATA HANDLING

The melting temperature was determined as the mean extrapolated onset temperature of Experiment 1 (-0.31°C), Experiment 2 (-0.33°C) and Experiment 3 (-0.68°C).

Conclusions:
The melting temperature of 1,4-H6XDI was determined to be 0°C. This result is read across to 1,3-H6XDI.


Executive summary:

Differential Scanning Calorimetry (DSC) experiments were performed in a GLP study according to EC A.1, OECD 102 and OPPTS 830.7200. The melting temperature of 1,4 -H6XDI was determined in triplicate obtaining a mean value of 0°C (at 1009 ± 2 hPa). This result is read across to 1,3-H6XDI.

Description of key information

The melting temperature of the substance was determined to be 0°C.

Key value for chemical safety assessment

Melting / freezing point at 101 325 Pa:
0 °C

Additional information

Determined using Differential Scanning Calorimetry (DSC) in a GLP study according to EC A.1, OECD 102 and OPPTS 830.7200 for a source chemical (1,4 -H6XDI). The result is read across to 1,3 -H6XDI.