| Identification | Back Directory | [Name]
2-Hydroxy-5-[[4'-[(2-hydroxy-3,6-disulfo-1-naphtyl)azo]-1,1'-biphenyl-4-yl]azo]benzoic acid trisodium salt | [CAS]
6548-26-1 | [Synonyms]
C.I.22280
Direct Red 18
C.I.Direct Red 18
C.I.Direct Red 18:C.I.22280
2-Hydroxy-5-[[4'-[(2-hydroxy-3,6-disulfo-1-naphtyl)azo]-1,1'-biphenyl-4-yl]azo]benzoic acid trisodium salt
Benzoic acid, 2-hydroxy-5-((4'-((2-hydroxy-3,6-disulfo-1-naphthalenyl)azo)(1,1'-biphenyl)-4-yl)azo)-, trisodium salt | [Molecular Formula]
C29H20N4O10S2.3Na | [MOL File]
6548-26-1.mol | [Molecular Weight]
717.6 |
| Hazard Information | Back Directory | [Preparation]
4-(4-Aminophenyl)benzenamine double nitriding, first with 2-Hydroxybenzoic acid coupling, again with 3-Hydroxynaphthalene-2,7-disulfonic acid coupling. | [Properties and Applications]
red red to blue light. Slightly soluble in water for pink, soluble in ethanol, insoluble in other organic solvents. The strong sulfuric acid to red light purple, orange for diluted. The dye solution with strong hydrochloric acid is palm red light, precipitation; Add thick sodium hydroxide solution have yellow precipitation.
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Standard
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Acid Resistance
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Alkali Resistance
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Light Fastness
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Soaping
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Water
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Fading
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Stain
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Fading
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Stain
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ISO
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4
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4-5
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1-2
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2-3
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3
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