Direct Red 4
Name:C.I.Direct Red 4,C.I.29165
Molecular Structure: Double azo class
C.I.Direct Red 4,C.I.29165,CAS 6420-41-3,908.78,C37H23N6Na3O12S3,Primula Scarlet GSH,Fast Scarlet GSX
Molecular Formula:C37H23N6Na3O12S3
Molecular Weight: 908.78
CAS Registry Number:6420-41-3
Manufacturing Methods : 6-Aminonaphthalene-2-sulfonic acid diazo, in acid conditions and N,N’-bis(4-hydroxy-2-sulfonaphthalene-7-yl)urea coupling, aniline diazo again, in alkaline conditions and coupled product matches.
Properties and Applications:yellow light red. Soluble in water for colourful red, slightly soluble in soluble fiber element, soluble in ethanol is shallow Red time Insoluble in other organic solvents. The strong sulfuric acid for purple, Pink is diluted, orange precipitation; The dye solution to join strong hydrochloric acid for colourful red; Add thick Red wine for sodium hydroxide solution.
| Standard | Acid Resistance | Alkali Resistance | Light Fastness | Soaping | Water | ||
| Fading | Stain | Fading | Stain | ||||
| ISO | 4-5 | 4-5 | 2-3 | 2 | 2 | ||
| AATCC | 4-5 | 4-5 | 2 | 3 | 3 | ||
List of Suppliers:
Aizen Primula Scarlet GSH( Hodogaya Chemical Co Ltd )
Nippon Fast Scarlet GSX( Sumitomo Chemical Co. Ltd )