Disodium 3-[(5-chloro-2-phenoxyphenyl)azo]-4-hydroxy-5-[[(p-tolyl)sulphonyl]amino]naphthalene-2,7-disulphonate

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:

From 24th of June to 3th of July, 2013

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

according to guideline

Guideline:

other: SOP-STR 028

Principles of method if other than guideline:

Differential scanning calorimetry or DSC is a thermoanalytical technique in which the difference in the amount of heat required to increase the temperature of a sample and reference is measured as a function of temperature. Both the sample and reference are maintained at nearly the same temperature throughout the experiment. It can be used to measure a number of characteristic properties of a sample, in fact using this technique it is possible to observe fusion and crystallization events as well as glass transition temperatures Tg. DSC can also be used to study oxidation, decomposition as well as other chemical reactions.

GLP compliance:

no

Type of method:

thermal analysis

Remarks:

DSC- solid state

Decomposition:

yes

Decomp. temp.:

> 272 - < 361 °C

From 25 -200 °C water/solvent is released, followed by a decomposition of the product between 272- 361 °C (onset at 305.0 °C; enthalpy 138.6 J/g) (see graph).

Conclusions:

From 25 -200 °C water/solvent is released by imbition/cristallization, followed by a decomposition of the product between 272- 361 °C (onset at 305.0 °C; enthalpy 138.6 J/g).

Executive summary:

Differential scanning calorimetry or DSC is a thermoanalytical technique in which the difference in the amount of heat required to increase the temperature of a sample and reference is measured as a function of temperature. Both the sample and reference are maintained at nearly the same temperature throughout the experiment. It can be used to measure a number of characteristic properties of a sample, in fact using this technique it is possible to observe fusion and crystallization events as well as glass transition temperatures Tg. DSC can also be used to study oxidation, decomposition as well as other chemical reactions. It was performed on the sample with SOP-STR 028 method.

From 25 -200 °C water/solvent is released, followed by a decomposition of the product between 272- 361 °C (onset at 305.0 °C; enthalpy 138.6 J/g).

Description of key information

Decomposition: 272- 361 °C 

Key value for chemical safety assessment

Melting / freezing point at 101 325 Pa:

349.84 °C

Additional information

Differential scanning calorimetry or DSC is a thermoanalytical technique in which the difference in the amount of heat required to increase the temperature of a sample and reference is measured as a function of temperature. Both the sample and reference are maintained at nearly the same temperature throughout the experiment. It can be used to measure a number of characteristic properties of a sample, in fact using this technique it is possible to observe fusion and crystallization events as well as glass transition temperatures Tg. DSC can also be used to study oxidation, decomposition as well as other chemical reactions. It was performed on the sample with SOP-STR 028 method.

From 25 -200 °C water/solvent is released, followed by a decomposition of the product between 272-361 °C (onset at 305.0 °C; enthalpy 138.6 J/g).

An estimated value of 349.84 °C with MPBPVP 1.43 was used as key value for risk assessment. The value is calculated on the smile of the salified substance:

Cc3ccc(cc3)S(=O)(=O)Nc4cc(cc2c4c(c(c(c2)S(=O)(=O)O([Na]))N=Nc5c(ccc(c5)CL)Oc1ccccc1)O)S(=O)(=O)O([Na]).