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Direct Brown 21

Name:C.I.Direct Brown 21,C.I.30155

Molecular Structure: trisazo class

C.I.Direct Brown 21,C.I.30155,CAS 6442-05-3,732.63,C35H22N6Na2O8S,Congo Brown R

C.I.Direct Brown 21,C.I.30155,CAS 6442-05-3,732.63,C35H22N6Na2O8S,Congo Brown R

Molecular Formula:C35H22N6Na2O8S

Molecular Weight: 732.63

CAS Registry Number:6442-05-3

Manufacturing Methods :  4-(4-Aminophenyl)benzenamine double nitriding, first coupled with 2-Hydroxybenzoic acid, and then coupled with Resorcinol , 4-Hydroxynaphthalene-1-sulfonic acid diazo, and the generation of single azo product matches.

Properties and Applications: brown. Soluble in water for yellow brown, and adequate soluble in alcohol. The strong sulfuric acid for purple, diluted is shallow brown. The dye solution to join strong hydrochloric acid have yellow brown precipitation; Add thick sodium hydroxide solution for orange red to big red.

Standard Acid Resistance Alkali Resistance Light Fastness Soaping Water
Fading Stain Fading Stain
ISO 3 4 3 1-2 2
AATCC 4 2 2-3 3-4 3-4

List of Suppliers:

Congo Brown R ( Bayer Group )


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