Benzene, 1,1'-oxybis[methyl-, sulfonated, ammonium salts

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:

06 December, 2017 - 27 February, 2018

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

according to guideline

Guideline:

EU Method A.1 (Melting / Freezing Temperature)

Version / remarks:

31 May 2008

Deviations:

no

Qualifier:

according to guideline

Guideline:

OECD Guideline 102 (Melting point / Melting Range)

Version / remarks:

July 27, 1995

Deviations:

no

Qualifier:

according to guideline

Guideline:

other: Organisation for Economic Co-operation and Development (OECD), Guidelines for the Testing of Chemicals, Guideline No. 113, "Screening Test for Thermal Stability and Stability in Air"; adopted May 12, 1981

Version / remarks:

May 12, 1981

Deviations:

no

Qualifier:

according to guideline

Guideline:

EPA OPPTS 830.7200 (Melting Point / Melting Range)

Version / remarks:

March 1998

Deviations:

no

GLP compliance:

yes (incl. QA statement)

Type of method:

differential scanning calorimetry

Key result

Melting / freezing pt.:

> 500 °C

Remarks on result:

other: Using a linear heating rate melting point was not observed from room temperature up to 500 °C.

Appearance of the Samples

 

Before the test the appearance of Benzene, 1,1’-oxybis(methyl-, sulfonated, ammonium saltwas reddish brown powder. After the experiments the test item melted and blackened in the crucible.

Measurement

 

The evaluation of the data was performed using the software STARe. As result, a thermogram was obtained in which the heat flow of the investigated sample is given as a function of the temperature. By integrating the area under the heat flow signals, the enthalpy of the process was obtained.

Values of the DSC run in the first experiment

Sample weight [mg]	Total loss of Mass of the Sample (%)
3.05	69.5

Values of the DSC run in the second experiment

Sample weight [mg]	Total loss of Mass of the Sample (%)
3.86	66.8

Result of theSupplementaryTest

 

During the heating up phase the test item showed endothermic signals in the temperature range of approx. 70 - 130 °C that can be associated with the water evaporation of the test item.

During the cooling down phase no thermal effects were observed from 300 to 25 °C.

Values of the DSC run in the Supplementary Test

Sample weight [mg]	Loss of Mass (%)	Observation
4.48	8.9	dark brown melt

 

Conclusions:

The endotherm and exotherm peaks in the thermograms do not imply phase transition from a solid to liquid state. Based on the large loss of mass and the appearance of the test item after the tests, it is concluded, that the test item decomposes up to 500 °C.
Using a linear heating rate melting point was not observed from room temperature up to 500 °C.

Executive summary:

For the determination of the melting point differential scanning calorimetry method was used.The test was carried out at normal atmospheric pressure. The endotherm and exotherm peaks in the thermograms do not imply phase transition from a solid to liquid state.Using a linear heating rate melting point was not observed from room temperature up to 500 °C.

Description of key information

For the determination of the melting point differential scanning calorimetry method was used.The test was carried out at normal atmospheric pressure. The endotherm and exotherm peaks in the thermograms do not imply phase transition from a solid to liquid state.Using a linear heating rate melting point was not observed from room temperature up to 500 °C.

Key value for chemical safety assessment

Melting / freezing point at 101 325 Pa:

500 °C