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Physical & Chemical properties

Melting point / freezing point

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Administrative data

Link to relevant study record(s)

Reference
Endpoint:
melting point/freezing point
Type of information:
experimental study
Adequacy of study:
key study
Study period:
2017-01-06 – 2017-01-06
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Justification for type of information:
Experimental result performed 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 1-(2-methyl-4-(2-methylphenylazo)phenylazo)- 2-naphthol (CAS No. 85-83-6 ) 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:
other: Capillary/metal block.
Specific details on test material used for the study:
- Name of test material (as cited in study report): Scarlet red
- Molecular formula : C24H20N4O
- Molecular weight : 380.449 g/mol
- Substance type:Organic
- Physical state:Solid
Key result
Melting / freezing pt.:
183.5 °C
Atm. press.:
976.9 hPa
Decomposition:
no
Sublimation:
no
Conclusions:
The melting point determination of 1-(2-methyl-4-(2-methylphenylazo)phenylazo)-2-naphthol (CAS No. 85-83-6) was done following OECD Guideline 102 and according to the metal block capillary method. The test was conducted in replicates and Mean Melting Point was determined to be 183.5°C at 976.9hPa
Executive summary:

The melting point determination of 1-(2-methyl-4-(2-methylphenylazo)phenylazo)-2-naphthol (CAS No. 85-83-6) was done following OECD Guideline 102 and according to the metal block capillary method. The test was conducted in replicates and Mean Melting Point was determined to be 183.5°C at 976.9hPa

Description of key information

The melting point determination of 1-(2-methyl-4-(2-methylphenylazo)phenylazo)-2-naphthol (CAS No. 85-83-6) was done following OECD Guideline 102 and according to the metal block capillary method. The test was conducted in replicates and Mean Melting Point was determined to be 183.5°C at 976.9hPa

Key value for chemical safety assessment

Melting / freezing point at 101 325 Pa:
183.5 °C

Additional information

The melting point determination of 1-(2-methyl-4-(2-methylphenylazo)phenylazo)-2-naphthol (CAS No. 85-83-6) was done following OECD Guideline 102 and according to the metal block capillary method. The test was conducted in replicates and Mean Melting Point was determined to be 183.5°C at 976.9hPa

Other supporting studies from various reliable sources such as authoritative database and handbooks ,also suggests that the melting point of chemical Scarlet Red was reported to be in the range of 184 degree C to 189 degree C,and the selected key study value lies in the range as mentioned above.

As the data from lab has K1 reliability and the test was performed using OECD guidelines which has the value of melting point as 183.5 degree C,thus considered as key study for the chemical safety assessment.