Disodium 4,4'-[[2,4-dihydroxy-5-(hydroxymethyl)-1,3-phenylene]bis(azo)]bisnaphthalene-1-sulphonate

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:

21/10/2015 - 21/10/2015

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Justification for type of information:

Experimental result using standard methods of analysis

Qualifier:

according to guideline

Guideline:

OECD Guideline 102 (Melting point / Melting Range)

Principles of method if other than guideline:

The melting point determination of test item Disodium 4,4’-[[2,4-dihydroxy-5-(hydroxymethyl)-1,3-phenylene]bis(azo)]bisnaphthalene-1-sulphonate (CAS No. 4553-89-3) was done as per the test guideline OECD 102. The method followed was according to Capillary/metal block

GLP compliance:

not specified

Type of method:

capillary method

Remarks:

Capillary/metal block

Key result

Atm. press.:

976.4 hPa

Decomposition:

yes

Decomp. temp.:

330 °C

Sublimation:

no

Remarks on result:

other: other details not available

Method Details		Observations	Remarks if, any
Guideline	OECD 102	-	The test item decomposed, changed its colour from dark blue to black. The decomposed substance was not soluble in water and did not impart brown colour to water that is a characteristic feature of test item CAS 4553-89-3. This confirmed that decomposition occurred.
Method	Capillary/metal block	-
Principle of method	The temperature at which a solid becomes a liquid at standard atmospheric pressure	-
Grinding of substance done		No
Atmospheric pressure (in hPa)		976.4
Decomposition	Decomposition temperature(°C), if applicable	Yes; 330 °C
Sublimation	Sublimation temperature (°C), if applicable	No
Melting point (°C) (RESULT)		-
Melting point range (°C), if applicable		-

Conclusions:

The decomposition temperature of Disodium 4,4’-[[2,4-dihydroxy-5-(hydroxymethyl)-1,3-phenylene]bis(azo)]bisnaphthalene-1-sulphonate (CAS No. 4553-89-3) is determined to be 330°C at 976.4hPa.

Executive summary:

The melting point determination of test item Disodium 4,4’-[[2,4-dihydroxy-5-(hydroxymethyl)-1,3-phenylene]bis(azo)]bisnaphthalene-1-sulphonate (CAS No. 4553-89-3) was done as per the test guideline OECD 102. The method followed was according toCapillary/metal block. The decomposition temperature of Disodium 4,4’-[[2,4-dihydroxy-5-(hydroxymethyl)-1,3-phenylene]bis(azo)]bisnaphthalene-1-sulphonate (CAS No. 4553-89-3) is determined to be 330°C at 976.4hPa.

Description of key information

The decomposition temperature of Disodium 4,4’-[[2,4-dihydroxy-5-(hydroxymethyl)-1,3-phenylene]bis(azo)]bisnaphthalene-1-sulphonate (CAS No. 4553-89-3) is determined to be 330°C at 976.4hPa.

Key value for chemical safety assessment

Melting / freezing point at 101 325 Pa:

330 °C

Additional information

The melting point determination of test item Disodium 4,4’-[[2,4-dihydroxy-5-(hydroxymethyl)-1,3-phenylene]bis(azo)]bisnaphthalene-1-sulphonate (CAS No. 4553-89-3) was done as per the test guideline OECD 102. The method followed was according to Capillary/metal block. The decomposition temperature of Disodium 4,4’-[[2,4-dihydroxy-5-(hydroxymethyl)-1,3-phenylene]bis(azo)]bisnaphthalene-1-sulphonate (CAS No. 4553-89-3) is determined to be 330°C at 976.4hPa.

Although the supporting predicted data from EPI suite suggests that the substance gets melted at 349.84°C rather than getting decomposed, but considering the experimental data as key study it can be concluded that the test substance gets degraded before melting.