Tetrasodium 4-amino-5-hydroxy-6-[[2-methoxy-5-[[2-(sulphonatooxy)ethyl]sulphonyl]phenyl]azo]-3-[[4-[[2-(sulphonatooxy)ethyl]sulphonyl]phenyl]azo]naphthalene-2,7-disulphonate

Boiling point

Link to relevant study record(s)

Reference

Endpoint:

boiling point

Type of information:

experimental study

Adequacy of study:

key study

Study period:

March 03, 2015 - March 05, 2015

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

according to guideline

Guideline:

EU Method A.2 (Boiling Temperature)

Deviations:

no

Qualifier:

according to guideline

Guideline:

OECD Guideline 103 (Boiling point/boiling range)

Deviations:

no

GLP compliance:

no

Type of method:

differential scanning calorimetry

Remarks:

Additionally a measurement with the capillary method was performed in order to clarify the results of the DSC measurements.

Key result

Boiling pt.:

> 500 °C

Atm. press.:

ca. 1 013 hPa

Decomposition:

yes

Decomp. temp.:

>= 225 - <= 330

Remarks on result:

not determinable

Melting point / melting range and boiling point / boiling range

(DSC measurement)

The DSC measurement in an aluminium crucible with a hole showed a broad endothermal effect in the temperature range of 40 – 200 °C and an exothermal effect in the temperature range of 225 – 330 °C. No further endothermal or exothermal effects were observed up to the final temperature of 500 °C. The results of the DSC measurement are summarized in Table 1.

Table1: Melting point (DSC-measurement)

Ident No.	Test item / mg	Final test temperature / °C	Type of effect	Temperature range / °C	Onset / °C	Crucible
34871	9.42	500	endothermal exothermal	40 – 200 225 – 330	not determinable not relevant	Aluminium with a hole

After the DSC measurement with thefinal test temperature of 500 °Cthe test item appeared unchanged. A mass loss of about 30 % occurred.

The onset temperature is derived from the intersection of the tangent line with the highest slope of the endothermal peak with the baseline. Because of the unusual shape of the endothermal peak in the temperature range of 40 – 200 °C no clear onset temperature could be determined. Therefore an additional measurement with the capillary method was performed in order to clarify the melting range.

Melting point / melting range andboiling point / boiling range(capillary tube in a metal block)

A measurement with the capillary method was performed to clarify the results of the DSC measurements. Since this measurement was performed only as a verifying screening a high heating rate of 10 K/min was chosen. The filling height of the test item was approximately 5 mm. The results are summarised inTable 2.

Table2: Results of the capillary method

No.	Set point / °C	Heating rate / K/min	End point / °C	Remarks
1	30	10	350	approx. 102 °C: beginning of condensate formation, test item unchanged approx. 273 °C: test item darkened (colour change from dark brown into black) up to 350 °C: no further change (test item did not melt or boil)

The capillary method measurement showed a condensate formation that is assumed to result from condensing water, as according to the certificate of analysis the test item contained 7.2 % water. The darkening of the test item at approx. 273 °C indicated a decomposition of the test item. This was in accordance with the exothermal effect observed in the DSC measurement in the temperature range of 225 – 330 °C.

Boiling point / boiling range (DSC measurement)

Under consideration of the results from the DSC measurements and the capillary method it was concluded that the test item did not boil under atmospheric conditions up to 500 °C, but decomposed starting around 225 °C.

Conclusions:

The test substance decomposes prior to boiling

Executive summary:

The test item did not boil under atmospheric conditions up to 500 °C. The test item decomposed starting around 225 °C.

Description of key information

The test substance decomposes prior to boiling

Key value for chemical safety assessment

Boiling point at 101 325 Pa:

1 442.57 °C

Temperature of decomposition (state purity):

225 °C

Additional information

The test item did not boil under atmospheric conditions up to 500 °C. The test item decomposed starting around 225 °C.

The theoretical Boiling Point was calculated by EpiWin to be 1442.57°C according to the Adapted Stein and Brown Method.