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Direct Green 33

Name:C.I.Direct Green 33,C.I.34270

Molecular Structure: trisazo class

C.I.Direct Green 33,C.I.34270,CAS 6428-18-8,1039.96,C42H31N7Na4O15S4

C.I.Direct Green 33,C.I.34270,CAS 6428-18-8,1039.96,C42H31N7Na4O15S4

Molecular Formula:C42H31N7Na4O15S4

Molecular Weight: 1039.96

CAS Registry Number:6428-18-8

Manufacturing Methods : Naphthalen-2-ol amine 8 diazo, and 3,5-Dimethylbenzenamine coupling, again diazo, and 5-Amino-7-ehtoxy-2-naphthalenesulfonic acid coupling, its product to diazo, and 4-Acetamido-5-hydroxynaphthalene-2,7-disulfonic acid coupling (finally coupling is with the sodium bicarbonate water cut in Pyridine in).

Properties and Applications: green. Soluble in water for the green, soluble in ethanol. For the strong sulfuric acid, diluted is green. The dye solution to join strong hydrochloric acid have pale-green precipitation; Add thick sodium hydroxide solution for the green.

Standard Acid Resistance Alkali Resistance Light Fastness Soaping Water
Fading Stain Fading Stain
ISO 3-4 3-4 5 2-3 3

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