reaction mass of: 7-amino-3,8-bis-[4-(2-sulfoxyethylsulfonyl)phenylazo]-4- hydroxynaphthalene-2-sulfonic acid, Na/K salt; 7-amino-3-[4-(2-sulfoxyethylsulfonyl)phenylazo]-4-hydroxy-8-[4-(2-sulfoxyethylsulfonyl)-2- sulfophenylazo]naphthalene-2-sulfonic acid, Na/K salt; 7-amino-8-[4-(2-sulfoxyethylsulfonyl)-phenylazo]-4-hydroxy-3-[4-(2-sulfoxyethylsulfonyl)- 2-sulfophenylazo]naphthalene-2-sulfonic acid, Na/K salt; 7-amino-3,8-bis-[4-(2-sulfoxyethylsulfonyl)-2-sulfophenylazo]-4-hydroxynaphthalene-2- sulfonic acid, Na/K salt

Endpoint summary

Description of key information

The physico-chemical properties of Reactive Brown 49 is as-

Appearance/physical state/colour:         dark red-brown powder

Melting point/ freezing point:                 >400 °C

Boiling point:                                        >400 °C (735 °C calc.)

Density:                                               1.81 g/cm³ at 20.2 °C

Particle size distribution (Granulometry): D50: 23 μm; <2.4% smaller 10 µm

Vapour pressure:                                 1.22 10 ^-23 Pa at 25 °C

Partition coefficient (log Pow):               < -4.5 at 20 °C

Water solubility:                                    277 g/l at 20 °C

Surface tension:                                   68.4 mN/m at 20 °C

Flash point :                                         N/A (data waiving)

Auto flammability:                                 >400 °C (self ignition temp.)

Flammability:                                        Non-flammable

Explosiveness:                                     Not explosive

Oxidising properties:                             No oxidising properties

Stability in organic solvents:                  stable in n-octanol

Dissociation constant:                           -7 (SO₃H-group)