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Physical & Chemical properties

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:
2015
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Reference:
Composition 1
Qualifier:
according to
Guideline:
EU Method A.1 (Melting / Freezing Temperature)
Deviations:
no
GLP compliance:
yes
Type of method:
capillary viscometer (static)
Test material information:
Composition 1
Melting / freezing pt.:
>= 231 - <= 234 °C
 Run Number  1  2  3
 Mass of sample Used (g)  0.006  0.006  0.006

Initial Melting Point (°C)

 231.3  231.5  231.1
 Final Melting Point °C 234.0   233.7  233.1

Results 231 -234 °C (range)

Conclusions:
the test substance Thio-Acid has a melting range of 231-234°C
Executive summary:

The test is conducted to determine the temperature or temperature range of the phase transition from a solid to a liquid.

The dry substance is finely pulverised in a mortar and is put into a capillary tube, fused at one end, so that the filling level is approximately 3 mm after being tightly packed. The temperature of the apparatus is heated to about 15°C below the expected melting temperature, then the filled capillary tubes are inserted and testing is started, generally at a maximum rate of 1°C/min.

This method has an estimated accuracy of ± 0.5°C.

The test is conducted in accordance with the procedure described in EU Regulation

(EC) 440/2008, Annex Part A test A1.

Description of key information

Thioacid was identified to melt in the range of 231 to 234 °C.

Key value for chemical safety assessment

Additional information

The test was conducted to determine the temperature or temperature range of the phase transition from a solid to a liquid.

The dry substance was finely pulverised in a mortar and put into a capillary tube, fused at one end, so that the filling level is approximately 3 mm after being tightly packed. The temperature of the apparatus was heated to about 15°C below the expected melting temperature, then the filled capillary tubes were inserted and testing started, generally at a maximum rate of 1°C/min.

This method has an estimated accuracy of ± 0.5°C. The test is conducted in accordance with the procedure described in EU Regulation

(EC) 440/2008, Annex Part A test A1.

The mean of at least three measurements, which are in the range of the estimated accuracy, is reported as the melting temperature.

The result was a range of 231 -234 °C.