Description

6-[(2,4-Diamino-5-methylphenyl)azo]-3-[[4'-[(2,4-diamino-5-methylphenyl)azo]-3,3'-dimethoxy[1,1'-biphenyl]-4-yl]azo]-4-hydroxynaphthalene-2,7-disulfonic acid disodium salt is a high-purity, polyazo direct dye intermediate of significant commercial importance. Its complex molecular structure is engineered to deliver exceptional color strength and fastness properties in demanding applications. This compound is primarily sought by manufacturers in the textile, leather, and specialty ink industries for synthesizing deep, vibrant dyes with superior performance characteristics.

Application

• Primary Intermediate for Direct Dyes: Key building block for manufacturing high-quality direct dyes used in cotton, viscose, and other cellulosic fiber dyeing.
• Leather Coloring Agent: Used in the synthesis of dyes for achieving deep, uniform, and wash-fast colors on leather goods.
• Specialty Ink Formulation: Serves as a precursor for pigments in inks requiring specific hue and stability, such as in packaging or security printing.
• Paper Dyeing: Employed in the production of dyes for coloring paper products where high color yield is essential.
• Research & Development: Used in chemical R&D for developing novel colorants and studying azo dye chemistry and properties.

Basic Information

Product Name	6-[(2,4-Diamino-5-methylphenyl)azo]-3-[[4'-[(2,4-diamino-5-methylphenyl)azo]-3,3'-dimethoxy[1,1'-biphenyl]-4-yl]azo]-4-hydroxynaphthalene-2,7-disulfonic acid disodium salt
CAS No.	6897-36-5
Molecular Formula	C38H32N10Na2O10S2
Molecular Weight	906.82 g/mol
Synonyms	Direct Blue 2; C.I. 22590; Direct Blue 2B; Amanil Direct Blue 2B; Direct Blue 2B (VAN); Direct Blue 2BN; Direct Blue 2G; Direct Blue 2GN; Direct Blue 2R; Direct Blue 2RN; Direct Blue B; Direct Blue BN; 22590 (Colour Index); Direct Blue 2 (C.I. 22590)
EINECS	Contact for details

Quality Control

Our production of this dye intermediate adheres to stringent quality control protocols to ensure batch-to-batch consistency and purity. Quality is verified through advanced analytical techniques including HPLC, UV-Vis spectroscopy, and titration methods. A comprehensive Certificate of Analysis (COA) detailing purity, impurity profile, and physical specifications is provided with every shipment to guarantee it meets your specific application requirements.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at room temperature (15-25°C). This material is hygroscopic (moisture-sensitive); the container must be kept tightly sealed to prevent absorption of atmospheric moisture, which can affect product quality and performance.

Specification

Item	Specification
Appearance	Dark blue to black powder or crystalline solid
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Moisture Content (KF Titration)	≤ 5.0%
Ash Content	≤ 1.0%
Water Solubility	Soluble

Note: Specifications can be tailored. Please contact us for the detailed technical data sheet of a specific grade.