Description

Trisodium 4-Amino-3-[[4'-[(2,4-Diaminophenyl)Azo]-3,3'-Dimethyl[1,1'-Biphenyl]-4-Yl]Azo]-5-Hydroxy-6-[(4-Sulphonatophenyl)Azo]Naphthalene-2,7-Disulphonate is a high-purity, water-soluble polyazo dye intermediate of significant commercial importance. Its complex molecular structure provides excellent chromophore properties, making it a critical precursor for synthesizing high-performance dyes and pigments. This compound is primarily sought by manufacturers in the textile, ink, and specialty coatings industries who require consistent quality and reliable supply chains for their production processes.

Application

• Primary Intermediate for Textile Dyes: Key building block for synthesizing high-grade, wash-fast direct and reactive dyes for cotton, wool, and nylon.
• Specialty Ink Formulations: Used in the production of pigments for inks requiring specific color strength and stability, including packaging and security inks.
• Industrial Coatings and Paints: Serves as a colorant precursor in coatings where durability and chemical resistance are paramount.
• Leather Dyeing: Employed in the synthesis of dyes for achieving deep, uniform coloration on leather goods.
• Paper Coloring: Used in the manufacture of dyes for high-quality paper and cardboard products.
• Research & Development: Serves as a reference standard and starting material in chemical R&D for novel colorant systems.

Basic Information

Item	Details
Product Name	Trisodium 4-Amino-3-[[4'-[(2,4-Diaminophenyl)Azo]-3,3'-Dimethyl[1,1'-Biphenyl]-4-Yl]Azo]-5-Hydroxy-6-[(4-Sulphonatophenyl)Azo]Naphthalene-2,7-Disulphonate
CAS No.	72906-45-7
Molecular Formula	C46H32N10Na3O13S3
Molecular Weight	Approx. 1106.0 g/mol
Synonyms	Direct Black 19 (sodium salt); C.I. 35255; Polyazo Black Dye Intermediate; Trisodium 4-amino-5-hydroxy-3,6-bis[[4'-[2-(2,4-diaminophenyl)diazenyl]-3,3'-dimethyl[1,1'-biphenyl]-4-yl]diazenyl]naphthalene-2,7-disulfonate; 4-Amino-5-hydroxy-3,6-bis[[4'-[2-(2,4-diaminophenyl)diazenyl]-3,3'-dimethyl[1,1'-biphenyl]-4-yl]diazenyl]naphthalene-2,7-disulfonic acid trisodium salt
EINECS	Contact for details

Quality Control

Our production of Trisodium 4-Amino-3-[[4'-[(2,4-Diaminophenyl)Azo]-3,3'-Dimethyl[1,1'-Biphenyl]-4-Yl]Azo]-5-Hydroxy-6-[(4-Sulphonatophenyl)Azo]Naphthalene-2,7-Disulphonate adheres to a rigorous quality management system. Every batch is analyzed to ensure it meets stringent specifications for purity, color strength, and impurity profile. A comprehensive Certificate of Analysis (COA) detailing assay, identification, and related substances is provided with each shipment to guarantee traceability and batch-to-batch consistency for your manufacturing process.

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). Due to its hygroscopic (moisture-sensitive) nature, the container must be kept sealed to prevent absorption of atmospheric moisture, which can affect product performance.

Specification

Item	Specification
Appearance	Dark blue to black powder or granules
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Loss on Drying	≤ 5.0%
Sulfated Ash	15.0% - 20.0%
Water Solubility	Freely soluble
Heavy Metals (as Pb)	≤ 20 ppm

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