Description

Trisodium 4-Hydroxy-3-[[4-[(2-Hydroxy-7-Sulphonato-1-Naphthyl)Azo]-2,5-Dimethoxyphenyl]Azo]-8-[(4-Sulphonatobenzoyl)Amino]Naphthalene-2-Sulphonate is a high-purity, water-soluble azo dye intermediate of significant industrial importance. Its complex polyazo structure with multiple sulphonate groups provides excellent solubility and binding affinity, making it a critical precursor for synthesizing specialized dyes and pigments. This compound is essential for manufacturers in the textile, ink, and specialty coatings industries seeking to produce vivid, stable colors with specific functional properties.

Application

This advanced azo intermediate is designed for high-performance applications where color strength and chemical stability are paramount.

• Primary use as a dye intermediate for the synthesis of reactive and direct dyes for cotton, wool, and nylon textiles.
• Manufacturing of high-grade pigments for inks used in packaging, security printing, and digital applications.
• Production of specialty colorants for coatings, plastics, and polymeric materials requiring light and wash fastness.
• Potential use in the formulation of biological stains and histological dyes for laboratory and diagnostic applications.
• Research and development of novel functional dyes for optoelectronics, sensors, and imaging technologies.
• As a key building block for metal-complex dyes, offering enhanced durability and color range.

Basic Information

Product Name	Trisodium 4-Hydroxy-3-[[4-[(2-Hydroxy-7-Sulphonato-1-Naphthyl)Azo]-2,5-Dimethoxyphenyl]Azo]-8-[(4-Sulphonatobenzoyl)Amino]Naphthalene-2-Sulphonate
CAS No.	94248-92-7
Molecular Formula	C41H26N5Na3O17S4
Molecular Weight	1083.85 g/mol (approx.)
Synonyms	Trisodium 8-[(4-sulfobenzoyl)amino]-4-hydroxy-3-[[4-[(2-hydroxy-7-sulfo-1-naphthyl)azo]-2,5-dimethoxyphenyl]azo]naphthalene-2-sulfonate; C.I. Reactive Brown 18; Reactive Brown 18; Reactive Brown K-B3R; Polyazo dye intermediate; Tetrasulfonated disazo dye; 94248-92-7; Trisodium salt of a hydroxynaphthalene azo dye.
EINECS	Contact for details

Quality Control

Our production of this azo dye intermediate adheres to stringent quality management systems to ensure batch-to-batch consistency and purity. Every lot is analyzed using advanced techniques like HPLC and spectrophotometry to confirm identity, strength, and impurity profiles. A comprehensive Certificate of Analysis (COA) detailing assay, heavy metal content, sulfated ash, and other critical parameters 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). Due to its hygroscopic (moisture-sensitive) nature, the container must be kept tightly sealed after opening to prevent absorption of atmospheric moisture, which can affect purity and handling properties.

Specification

Item	Specification
Appearance	Dark brown to black powder or solid
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Loss on Drying	≤ 5.0%
Sulfated Ash	20.0% - 30.0%
Heavy Metals (as Pb)	≤ 20 ppm
Water Solubility	Freely soluble
pH (1% Solution)	7.0 - 9.0

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