Description

4-Amino-3-[[4'-[(2,4-Diaminophenyl)Azo]-2,2'-Disulpho[1,1'-Biphenyl]-4-Yl]Azo]-5-Hydroxy-6-(Phenylazo)Naphthalene-2,7-Disulphonic Acid, Sodium Salt is a high-purity, polyazo dye intermediate of significant industrial importance. This compound is valued for its ability to impart deep, complex color shades and its excellent binding properties in various substrates. It is primarily sought after by manufacturers in the textile dyeing, leather finishing, and specialty ink sectors who require consistent, high-performance colorants for demanding applications.

Application

• Textile Dyeing: A key intermediate for synthesizing high-grade, wash-fast black and dark-colored direct and reactive dyes for cotton, wool, and nylon.
• Leather Processing: Used in the formulation of dyes for leather finishing, providing rich, uniform coloration with good penetration.
• Specialty Inks: Serves as a colorant component in the production of inks for packaging, security printing, and other industrial marking applications.
• Paper Coloring: Employed in the manufacture of dyes for coloring paper and paperboard products.
• Research & Development: Used as a standard or precursor in chemical research for developing new polymeric dyes and functional colorants.
• Functional Dye Synthesis: Acts as a building block for creating dyes with specific optical or electronic properties for advanced materials.

Basic Information

Product Name	4-Amino-3-[[4'-[(2,4-Diaminophenyl)Azo]-2,2'-Disulpho[1,1'-Biphenyl]-4-Yl]Azo]-5-Hydroxy-6-(Phenylazo)Naphthalene-2,7-Disulphonic Acid, Sodium Salt
CAS No.	83221-63-0
Molecular Formula	C40H28N10O14S4 · xNa
Molecular Weight	Contact for details
Synonyms	Direct Black 22 (Intermediate); C.I. 35435; Polyazo Black Dye Intermediate; Sodium 4-amino-3-[[4'-[(2,4-diaminophenyl)azo]-2,2'-disulpho[1,1'-biphenyl]-4-yl]azo]-5-hydroxy-6-(phenylazo)naphthalene-2,7-disulphonate; 4-Amino-3-[[4'-[(2,4-diaminophenyl)diazenyl]-2,2'-disulfonyl-1,1'-biphenyl-4-yl]diazenyl]-5-hydroxy-6-(phenyldiazenyl)naphthalene-2,7-disulfonic acid sodium salt; Azo Dye Intermediate 83221-63-0; Black Dye Precursor
EINECS	Contact for details

Quality Control

Our production of this dye intermediate adheres to strict quality management protocols to ensure batch-to-batch consistency and purity. Every lot undergoes comprehensive analytical testing, including HPLC for purity, spectrophotometry for color strength, and elemental analysis. A detailed Certificate of Analysis (COA) documenting identity, purity, and impurity profiles is provided with each shipment to support your quality assurance processes.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, well-ventilated area at a controlled room temperature (15-25°C). Due to its hygroscopic nature, the container must be kept tightly sealed after opening to prevent moisture absorption, which can affect product performance. Keep away from incompatible materials.

Specification

Item	Specification
Appearance	Dark blue to black powder or granules
Identification (IR)	Conforms to structure
Assay (HPLC)	Min. 95%
Moisture (KF)	Max. 5.0%
Ash Content	Contact for details
Water Solubility	Freely soluble
Heavy Metals (as Pb)	Max. 20 ppm

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