Direct Red 20
Name:C.I.Direct Red 20,C.I.15075
Molecular Structure: Single azo class
C.I.Direct Red 20,C.I.15075,CAS 5850-73-7,634.01,C24H14ClN3Na2O7S3
Molecular Formula:C24H14ClN3Na2O7S3
Molecular Weight: 634.01
CAS Registry Number:5850-73-7
Manufacturing Methods : 4-(6-Methyl-2,3-dihydrobenzo[d]thiazol-2-yl)benzenamine diazo, and 8-Chloro-1-naphthol-3,6-disulfonic acid coupling.
Properties and Applications: blue light pink. Soluble in water and ethanol for pink to product red, insoluble in other organic solvents. The strong sulfuric acid to red light purple, for the big red after diluted. The dye solution to join strong hydrochloric acid for product red; Add thick sodium hydroxide solution for purplish red color.
| Standard | Acid Resistance | Alkali Resistance | Light Fastness | Soaping | Water | ||
| Fading | Stain | Fading | Stain | ||||
| ISO | 5 | 4-5 | 2 | 1-2 | 1-2 | ||
| AATCC | 2 | 5 | 2 | 1 | 1 | ||
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