Reaction mass of Disodium decyl(sulphonatophenoxy)benzenesulphonate and Disodium oxybis[decylbenzenesulphonate]

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:

September 30, 2016 to December 19, 2016

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

according to guideline

Guideline:

OECD Guideline 102 (Melting point / Melting Range)

Deviations:

no

Qualifier:

according to guideline

Guideline:

EU Method A.1 (Melting / Freezing Temperature)

Deviations:

no

GLP compliance:

yes

Type of method:

other: Metal block method.

Specific details on test material used for the study:

Identity: EC# 915-640-4
Physical state: White powder
Storage conditions: Room temperature (15 to 25°C)
Batch number: YY00F3RL01-Dry
Purity: Mixture
Expiry date: 28 June 2017

Melting / freezing pt.:

> 100 °C

Atm. press.:

101 325 Pa

Decomposition:

yes

Decomp. temp.:

220 °C

Remarks on result:

other:

Remarks:

EC# 915-640-4 was found to partially melt at temperatures above approximately 100°C, before decomposing from approximately 220°C.

Results:

The test item showed the initial stages of melting from approximately 100°C, but did not melt completely. At approximately 245°C, evolution of gas from the partially molten sample was observed to force the sample up the capillary tube, indicating decomposition. The sample continued to gradually darken from this point.

For confirmatory purposes, differential scanning calorimetry (DSC) was also conducted using a Mettler-Toledo FP900 Thermosystem with FP85 DTA/DSC measuring cell, in an air atmosphere at a heating rate of 5°C/minute. The DSC trace showed a broad shallow endotherm below 150°C, followed by significant exotherms from approximately 220˚C which were consistent with the indication of decomposition in the metal block test.

Conclusions:

EC# 915-640-4 was found to partially melt at temperatures above approximately 100°C, before decomposing from approximately 220°C.

Executive summary:

The melting temperature was determined using the metal block method. The melting temperature of a substance is defined as the temperature (°C) at which the phase

transition from solid to liquid state at normal atmospheric pressure takes place. Dry test item was tightly packed into a capillary tube to a height of 3 mm. In an initial

estimation of melting point, the capillary tube was placed in the apparatus and heated at 10°C/minute up to 360°C.

The test item showed the initial stages of melting from approximately 100°C, but did not melt completely. At approximately 245°C, evolution of gas from the partially molten sample was observed to force the sample up the capillary tube, indicating decomposition. The sample continued to gradually darken from this point.

For confirmatory purposes, differential scanning calorimetry (DSC) was also conducted using a Mettler-Toledo FP900 Thermosystem with FP85 DTA/DSC measuring cell, in an air atmosphere at a heating rate of 5°C/minute. The DSC trace showed a broad shallow endotherm below 150°C, followed by significant exotherms from approximately 220˚C which were consistent with the indication of decomposition in the metal block test.

EC# 915-640-4 was found to partially melt at temperatures above approximately 100°C, before decomposing from approximately 220°C.

Description of key information

EC# 915-640-4 was found to partially melt at temperatures above approximately 100°C, before decomposing from approximately 220°C

Key value for chemical safety assessment

Melting / freezing point at 101 325 Pa:

100 °C