Direct Red 90
Name:C.I.Direct Red 90,C.I.28170
Molecular Structure: Double azo class
C.I.Direct Red 90,C.I.28170,CAS 5873-24-5,689.63,C30H21N5Na2O8S2
Molecular Formula:C30H21N5Na2O8S2
Molecular Weight: 689.63
CAS Registry Number:5873-24-5
Manufacturing Methods : 4-Aminobenzenesulfonic acid diazo, and O-Methylaniline coupling, its product to diazo, and 7-Amino-4-hydroxynaphthalene-2-sulfonic acid coupling.
Properties and Applications: blue-ray red. Soluble in water for red light purple. The strong sulfuric acid for blue, red after diluted precipitation. The dye solution to join strong hydrochloric acid have dark purple precipitation; Add sodium hydroxide have red light purple precipitation.
| Standard | Acid Resistance | Alkali Resistance | Light Fastness | Soaping | Water | ||
| Fading | Stain | Fading | Stain | ||||
| ISO | 3 | 4-5 | 4-5 | 3 | 3 | ||
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