Description

Trisodium 4-Hydroxy-7-[[[[5-Hydroxy-7-Sulphonato-6-[(o-Tolyl)Azo]-2-Naphthyl]Amino]Carbonyl]Amino]-3-[(2-Methyl-4-Sulphonatophenyl)Azo]Naphthalene-2-Sulphonate is a high-purity, water-soluble azo dye intermediate of significant industrial importance. This compound is valued for its role in synthesizing vibrant and stable colorants, particularly in applications requiring specific shades and performance characteristics. It is a critical raw material for manufacturers in the textile, ink, and specialty coatings industries seeking reliable and consistent colorant production.

Application

This specialized azo dye intermediate is engineered for high-performance colorant synthesis. Its primary and derived applications include:

• Textile Dyeing: A key precursor for the synthesis of reactive and direct dyes used on cotton, wool, and nylon fibers.
• Ink Manufacturing: Used in the production of pigments for printing inks, including those for packaging and publications.
• Leather Coloring: Employed in the formulation of dyes for the leather tanning and finishing industry.
• Paper Coloring: A component in the manufacture of dyes for specialty and decorative papers.
• Plastic and Polymer Coloring: Serves as an intermediate for colorants used in plastics and synthetic materials.
• Research & Development: Used as a standard or building block in chemical research for developing new chromophores and functional dyes.

Basic Information

Product Name	Trisodium 4-Hydroxy-7-[[[[5-Hydroxy-7-Sulphonato-6-[(o-Tolyl)Azo]-2-Naphthyl]Amino]Carbonyl]Amino]-3-[(2-Methyl-4-Sulphonatophenyl)Azo]Naphthalene-2-Sulphonate
CAS No.	6420-43-5
Molecular Formula	C35H23N5Na3O13S3
Molecular Weight	919.80 g/mol
Synonyms	Reactive Black 5 (precursor/intermediate); C.I. 20505; Trisodium 4-hydroxy-3-[(2-methyl-4-sulfophenyl)azo]-7-[[[5-hydroxy-6-[(2-methylphenyl)azo]-7-sulfo-2-naphthalenyl]amino]carbonyl]amino]-2-naphthalenesulfonate; 2-Naphthalenesulfonic acid, 4-hydroxy-3-[(2-methyl-4-sulfophenyl)azo]-7-[[[[5-hydroxy-6-[(2-methylphenyl)azo]-7-sulfo-2-naphthyl]amino]carbonyl]amino]-, trisodium salt; Azo dye intermediate 6420-43-5; Black 5 dye intermediate
EINECS	229-185-2

Quality Control

Our production of this dye intermediate adheres to stringent quality control protocols to ensure batch-to-batch consistency and purity for your synthesis processes. Quality is verified through advanced analytical techniques including HPLC, UV-Vis spectroscopy, and titration methods. A comprehensive Certificate of Analysis (COA) detailing purity, assay, and impurity profiles is provided with every shipment to support your quality assurance and regulatory needs.

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 product is hygroscopic (moisture-sensitive); ensure the container is kept tightly sealed to prevent absorption of atmospheric moisture.

Specification

Item	Specification
Appearance	Dark blue to black powder or granules
Identification (IR)	Conforms to structure
Assay (HPLC)	Min. 95.0%
Moisture Content	Max. 5.0%
Sulfated Ash	Max. 30.0%
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.