Description

4-[[4-[[[[5-hydroxy-6-(phenylazo)-7-sulpho-2-naphthyl]amino]carbonyl]amino]-5-methoxy-o-tolyl]azo]-5-[(phenylsulphonyl)oxy]naphthalene-2,7-disulphonic acid, sodium salt is a high-purity, synthetic organic dye belonging to the azo dye class, valued for its strong colorant properties and chemical stability. This compound is engineered to deliver consistent, vibrant coloration and excellent performance in demanding industrial applications. It is primarily required by manufacturers in the textile, ink, and specialty coatings industries seeking reliable and high-quality dye intermediates.

Application

• Textile Dyeing: A key intermediate for dyeing natural and synthetic fibers, particularly for achieving deep, fast colors.
• Ink Manufacturing: Used in the formulation of industrial and specialty printing inks requiring high color strength and stability.
• Leather Coloring: Employed in the dyeing process for leather goods to provide durable and uniform coloration.
• Paper Staining: Applied in the production of colored papers and paper products.
• Specialty Coatings: Incorporated into coatings and paints where specific color properties are required.
• Research & Development: Serves as a precise chemical reagent in R&D laboratories for developing new colorants and materials.

Basic Information

Product Name	4-[[4-[[[[5-hydroxy-6-(phenylazo)-7-sulpho-2-naphthyl]amino]carbonyl]amino]-5-methoxy-o-tolyl]azo]-5-[(phenylsulphonyl)oxy]naphthalene-2,7-disulphonic acid, sodium salt
CAS No.	83721-41-9
Molecular Formula	C41H28N6O14S4Na2 (or similar, based on structure)
Molecular Weight	Contact for details
Synonyms	Reactive Black 5 (Analog/Related); Azo Dye Intermediate 83721-41-9; Sodium 4-[[4-[[[[5-hydroxy-6-(phenylazo)-7-sulfo-2-naphthyl]amino]carbonyl]amino]-5-methoxy-2-methylphenyl]azo]-5-(phenylsulfonyloxy)naphthalene-2,7-disulfonate; C.I. Reactive Black; Disazo dye sodium salt; Textile Dye Intermediate; Sulfonated Azo Dye
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 and spectrophotometry. A comprehensive Certificate of Analysis (COA) detailing purity, identity, and impurity profiles is provided with every shipment to guarantee compliance with your specifications.

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 powder or solid
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95% (or as per grade)
Moisture Content	≤ 5.0%
Ash Content	≤ 2.0%
Water Solubility	Freely soluble

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