Description

7-[[[[6-[(4-ethoxy-3-sulphophenyl)azo]-5-hydroxy-7-sulpho-2-naphthyl]amino]carbonyl]amino]-4-hydroxy-3-[(6-sulpho-2-naphthyl)azo]naphthalene-2-sulphonic acid, sodium salt is a high-purity, complex azo dye intermediate essential for producing vibrant and durable synthetic colors. This compound is valued for its ability to impart specific color characteristics and excellent fastness properties in demanding industrial applications. It is primarily required by manufacturers in the textile, ink, and specialty pigment industries seeking consistent quality and reliable supply for their production processes.

Application

• As a key precursor for manufacturing high-performance reactive and direct dyes used in textile coloring, particularly for cotton and cellulose fibers.
• In the synthesis of specialized pigments for inks, including those used in packaging, security printing, and digital applications.
• For the production of colorants in the paper industry, providing consistent hue and good paper substrate affinity.
• As an intermediate in research and development for novel functional dyes with potential applications in electronics or sensors.
• In the formulation of industrial colorants for plastics, leather, and other specialty materials requiring specific color properties.

Basic Information

Item	Details
Product Name	7-[[[[6-[(4-ethoxy-3-sulphophenyl)azo]-5-hydroxy-7-sulpho-2-naphthyl]amino]carbonyl]amino]-4-hydroxy-3-[(6-sulpho-2-naphthyl)azo]naphthalene-2-sulphonic acid, sodium salt
CAS No.	83763-85-3
Molecular Formula	C39H27N7O16S4Na4 (or similar salt form; contact for exact formula)
Molecular Weight	Contact for details
Synonyms	Reactive Black 5 Precursor; C.I. Reactive Black 5 Intermediate; Sodium 7-[[[[6-[(4-ethoxy-3-sulfophenyl)azo]-5-hydroxy-7-sulfo-2-naphthyl]amino]carbonyl]amino]-4-hydroxy-3-[(6-sulfo-2-naphthyl)azo]naphthalene-2-sulfonate; Azo Dye Intermediate 83763-85-3; Tetrasodium 4-amino-5-hydroxy-3-[[4-[(2-sulfooxyethyl)sulfonyl]phenyl]azo]-6-(phenylamino)-2,7-naphthalenedisulfonate related compound; Black 5 Dye Intermediate; CAS 83763-85-3
EINECS	Contact for details

Quality Control

Our production of this advanced dye intermediate adheres to strict quality management systems to ensure batch-to-batch consistency and purity. Every lot is tested against rigorous in-house specifications, which typically include parameters for assay (HPLC), impurity profile, and color strength. A comprehensive Certificate of Analysis (COA) detailing all test results is provided with each shipment to support your quality assurance protocols.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at a controlled room temperature (15-25°C). Keep away from strong oxidizing agents and incompatible materials. The product is light-sensitive (store away from light) and hygroscopic (moisture-sensitive); ensure containers are sealed after each use to prevent moisture absorption and degradation.

Specification

Item	Specification
Appearance	Dark blue to black powder or solid
Identification (IR)	Conforms to reference spectrum
Assay (HPLC)	Min. 95%
Moisture Content	Max. 5.0%
Sulfated Ash	Contact for details
Heavy Metals (as Pb)	Max. 20 ppm
Solubility (in Water)	Partially to fully soluble (contact for details)

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