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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

Diss Factsheets

Physical & Chemical properties

Endpoint summary

Administrative data

Description of key information

Additional information


In a study conducted by Sustainability suppport services(2016) on the basis of physical observation the chemicalTris[5-amino-4-hydroxy-3-(phenylazo)naphthalene-2,7- disulphonato(2-)]dialuminium was observed to be red colored powder in appearance.

Melting point:

The melting point determination of Tris[5-amino-4-hydroxy-3-(phenylazo)naphthalene-2,7- disulphonato(2-)]dialuminium (CAS No. 68475-50-3) was done following OECD Guideline 102 and according to the metal block capillary method. The test was conducted in replicates and Mean Decomposition Range (°C) was found to be 342.75-346.75°C at 971.9hPa.

Boiling point:

According to Column II of Annex VII, the boiling point study does not need to be conducted for solids which either melt above 300 °C or decompose before boiling.

The substance Tris[5-amino-4-hydroxy-3-(phenylazo)naphthalene-2,7-disulphonato(2-)]dialuminium(CAS No.68475-50-3)is a solid at room temperature and it is reported to decompose at a temperature of 342.75-346.75°C without melting .Hence, it is not feasible to determine boiling point and the endpoint wasconsidered for waiver.


The density of test item Tris[5-amino-4-hydroxy-3-(phenylazo)naphthalene-2,7-disulphonato(2- )]dialuminium (CAS No. 68475-50-3) was determined following OECD Guideline 109 and according to the method Adapted from ASTM D854-02 using glass pyknometer .The density of test item is was found to be 1.425 g/cm³ at 20°C and 971.2 hPa.

Particle size distribution:

The particle size distribution of test test item Tris[5-amino-4-hydroxy-3-(phenylazo)naphthalene-2,7- disulphonato(2-)]dialuminium (CAS No. 68475-50-3 ) was determined by granulometric analysis with rotap sieve shaker. The particle size distribution was determined to be in the range of 150 micron to 25 micron.

Vapour pressure:

Modified Grain method was used to estimate the vapour pressure of the test chemical using MPBPVP v1.43 of EPI SUITE. The estimated vapor pressure of Aluminum, tris[5-amino-4-hydroxy-3-(phenylazo)-2,7-naphthalenedisulfonato(2-)]di- was 3.36E -019 Pa at 25°C

It is reported as 0.000000001 Pa for the chemical safety assessment due to the limitation in the field.

Auto flammability:

Tris[5-amino-4-hydroxy-3-(phenylazo)naphthalene-2,7- disulphonato(2-)]dialuminiumdid not catch fire on being exposed to air at room temperature of 27°C and atmospheric pressure of 966 hPa. This indicates that Tris[5-amino-4-hydroxy-3-(phenylazo)naphthalene-2,7- disulphonato(2-)]dialuminiumis not auto-flammable.


Tris[5-amino-4-hydroxy-3-(phenylazo)naphthalene-2,7- disulphonato(2-)]dialuminium ignites only when the flame of bunsen burner having temperature of 950°C is brought in contact with it. Thus it can be concluded that Tris[5-amino-4-hydroxy-3-(phenylazo)naphthalene-2,7- disulphonato(2-)]dialuminium is flammable only at high temperature of about 950°C. However since such high temperatures are not found under normal circumstances of transportation and use, Tris[5-amino-4-hydroxy-3-(phenylazo)naphthalene-2,7- disulphonato(2-)]dialuminium was considered non-flammable for chemical safety assessment.

Partition coefficient:

KOWWIN v 1.68 of EPISUITE was used to estimate the octanol water partition coefficient of the test chemical.

The estimated log Pow of Aluminum, tris[5-amino-4-hydroxy-3-(phenylazo)-2,7-naphthalenedisulfonato(2-)]di- was 0.4845.

Based on this value, it can be concluded that Aluminum, tris[5-amino-4-hydroxy-3-(phenylazo)-2,7-naphthalenedisulfonato(2-)]di- is hydrophillic in nature

Water solubility:

WATERNT v1.01 of EPISUITE was used to estimate the water solubility of the test chemical

The estimated water solubility of Aluminum, tris[5-amino-4-hydroxy-3-(phenylazo)-2,7-naphthalenedisulfonato(2-)]di- at 25 deg C was1000000 mg/L

Based on the results, it can be concluded that Aluminum, tris[5-amino-4-hydroxy-3-(phenylazo)-2,7-naphthalenedisulfonato(2-)]di- is highly soluble in water.

Surface tension:

In accordance with column 2 of Annex VII of the REACH regulation, the study need only be conducted if surface activity is a desired property of the chemical. The chemical Tris[5-amino-4-hydroxy-3-(phenylazo)naphthalene-2,7- disulphonato(2-)]dialuminium is used as a cosmetic chemical. For this use, surface activity is not an important property. Hence this study was considered for waiver.

Flash point:

The flash point determination of Tris[5-amino-4-hydroxy-3-(phenylazo)naphthalene-2,7-disulphonato(2- )]dialuminium (CAS No. 68475-50-3) was done following closed cup method using Pensky-Martens flash point apparatus. The test was conducted and flash point was found to be greater than 250°C at 970.2hPa.


The pH determination of test item itemTris[5-amino-4-hydroxy-3-(phenylazo)naphthalene-2,7-disulphonato(2-)]dialuminium (CAS No. 68475-50-3 )was done following OECD guideline 122. The pH of 1% w/v aqueousdispersionwas measured with the help of pH meter and the mean pH was observed to be 4.36 at 29 °C .