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In a National Center for Biotechnology Information, U.S. National Library of Medicine report (2016), mentioned that the 4-aminoazobenzene-3,4'-disulphonic acid was appeared to be Organic powder solid.

In a Center for Chemical Hazard Assessment, Syracuse Research Corporation report (1981), mentioned that the4-aminoazobenzene-3,4'-disulphonic acid wasappearedto be Organic solid in needles form with dark violet colour.  

Hence, on the basis of above available data,4-aminoazobenzene-3,4'-disulphonic acid was appeared to beneedles orpowder organic solidwith dark violet colour. 

Melting point:

On the basis of prediction using EPI MPBVP v1.43 (2016), Estimated melting point of Benzenesulfonic acid, 2-amino-5- (4-sulfophenyl)azo – was found to be 349.84 deg C

On the basis of prediction using Danish (Q) SAR Database (2016), Estimated melting point of Benzenesulfonic acid, 2-amino-5- (4-sulfophenyl)azo – was found to be 264.73 deg C

Hence, on the basis of above available data,melting point of Benzenesulfonic acid, 2-amino-5- (4-sulfophenyl)azo – was found to be 264.73 to 349.84 deg C.

Boling point:

On the basis of prediction using EPI MPBVP v1.43 and Danish (Q) SAR Database (2016), Estimated boiling point of Benzenesulfonic acid, 2-amino-5- (4-sulfophenyl)azo – was found to be 611.61 deg C.

Density:

In Chemspider - ACD/PhysChem Suite (2012), Density of 4-aminoazobenzene-3, 4’-disulphonic acid was estimated to be 1.7 g/cm3.

Particle Size Distribution:

The particle size distribution (granulometry) of 4'-aminoazobenzene-3,4'-disulphonic acid by Rotap sieve shaker analysis was found to be in the range of 75 micrometer to 500 micrometer. Majority of the particles were found to be in the size more than 150 (40.32%) micrometer in size.

Vapor pressure:

On the basis of prediction using EPI MPBVP v1.43, Danish (Q) SAR and SRC database (2016), Vapour pressure of 4-aminoazobenzene-3, 4’-disulphonic acid was estimated to be 0.00000000000000466 Pa at 25 deg C. It is reported as 0.000000001 Pa for the chemical safety assessment due to the limitation in the field.

Partition coefficient:

On the basis of prediction using EPI MPBVP v1.43, Danish (Q) SAR and SRC database (2016), Octanol Water partition co-efficient (Log Pow) value of 4-aminoazobenzene-3, 4’-disulphonic acid was estimated to be -0.91 at 25 deg C. This value indicates that 4-aminoazobenzene-3, 4’-disulphonic acid is hydrophilic in nature.

Water solubility:

On the basis of prediction using EPI MPBVP v1.43 (2011), Water solubility of 4-aminoazobenzene-3, 4’-disulphonic acid is estimated to be 1000000 mg/L at 25 deg C which indicates that the substance is very soluble in nature.

In a report given by Center for Chemical Hazard Assessment Syracuse Research Corporation (1981), 4 aminoazobenzene- 3, 4-disulfonic-acid was determined to be soluble in hot water.

In a Syracuse Research Corporation data base (2016), Benzenesulfonic acid, 2 amino 5((4 sulfophenyl) was determined to be 124 mg/L at 25 deg C which indicate that the substance is slightly soluble in water.

Therefore, on the basis of above available data, 4-aminoazobenzene-3, 4’-disulphonic acid was very soluble to in hot 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 4-aminoazobenzene-3,4'-disulphonic acid is used as an intermediate to manufacture other chemicals. For this use, surface activity is not desired property. Hence this study was considered for waiver.

Flash point:

In a Chemspider - ACD/PhysChem Suite (2012), flash point of 4-aminoazobenzene-3,4'-disulphonic acid was estimated to be 322.992 °C using the ACD/Labs’ ACD/PhysChem Suite.

Auto flammability:

The chemical 4-aminoazobenzene-3,4'-disulphonic acid does not catch fire upon exposure to air at normal conditions of temperature and pressure. Thus the chemical is not likely to be "Auto flammable" and hence this end point was considered for waiver and the chemical is not considered to be "self igniting".

Flammability:

The chemical 4-aminoazobenzene-3,4'-disulphonic acid which is an intermediate chemical used to manufacture other chemicals and is unlikely to be "Flammable" under normal conditions of use, storage and transportation as per the manufacturer. Hence this end point was considered for waiver & the chemical is classified as "Non Flammable".

Explosiveness:

In accordance with column 2 of Annex VII of the REACH regulation, the study does not need to be conducted since there are no chemical groups associated with explosive properties present in the molecule of 4-aminoazobenzene-3,4'-disulphonic acid, except the azo group. Thus, this end point was considered for waiver and the chemical is considered to be "Non explosive".

Oxidising property:

The substance 4-aminoazobenzene-3,4'-disulphonic acid is incapable of reacting exothermically with combustible materials on the basis of the chemical structure. It is an organic substance containing oxygen but no halogen atoms and these elements are not chemically bonded to nitrogen or oxygen. Thus, the chemical is not likely to exhibit oxidising properties.

Viscosity:

This end point was considered for waiver since viscosity is an inherent property of a liquid that offers resistance to its flow and 4-aminoazobenzene-3,4'-disulphonic acid is a solid substance and hence this testing was considered scientifically unjustified.