Description

Trisodium 5-[[2,4-dihydroxy-5-[[4-[(4-nitro-2-sulphonatophenyl)amino]phenyl]azo]phenyl]azo]-8-[[4-[(4-nitro-2-sulphonatophenyl)amino]phenyl]azo]naphthalenesulphonate is a high-purity, water-soluble azo dye intermediate of significant commercial importance. Its complex, multi-azo structure provides exceptional chromophoric properties, making it a critical precursor for synthesizing high-performance dyes and pigments. This compound is essential for manufacturers in the textile, ink, and specialty coatings industries seeking to produce vivid, stable colors with excellent fastness properties.

Application

• Textile Dyeing: Primary intermediate for the synthesis of reactive, direct, and acid dyes used on cotton, wool, and nylon fibers.
• Ink Manufacturing: Key component in the production of high-quality printing inks, including those for packaging and security applications.
• Pigment Production: Used in the manufacture of organic pigments for plastics, paints, and industrial coatings.
• Leather Coloring: Intermediate for dyes applied in the leather tanning and finishing industry.
• Paper Coloring: Used in the synthesis of dyes for specialty paper and board products.
• Research & Development: Serves as a reference standard and building block in chemical R&D for novel colorants.

Basic Information

Product Name	Trisodium 5-[[2,4-dihydroxy-5-[[4-[(4-nitro-2-sulphonatophenyl)amino]phenyl]azo]phenyl]azo]-8-[[4-[(4-nitro-2-sulphonatophenyl)amino]phenyl]azo]naphthalenesulphonate
CAS No.	72496-92-5
Molecular Formula	C46H28N10Na3O17S3
Molecular Weight	~1150.0 g/mol (Contact for exact details)
Synonyms	Trisodium 5,8-bis[[4-[(4-nitro-2-sulfophenyl)azo]phenyl]amino]-1-naphthalenesulfonate; Azo dye intermediate 72496-92-5; CI 27290 (related); Trisodium salt of a bis-azo naphthalene sulfonic acid; 5,8-Bis[(4-[(4-nitro-2-sulfophenyl)azo]phenyl)amino]-1-naphthalenesulfonic acid trisodium salt; Reactive Dye Intermediate; Direct Black Dye Intermediate.
EINECS	Contact for details

Quality Control

Our trisodium azo dye intermediate is produced under stringent quality management systems to ensure batch-to-batch consistency and high purity. Each lot undergoes comprehensive analytical testing, including HPLC for purity and identity confirmation via IR spectroscopy. Certificates of Analysis (COA) detailing assay, impurity profile, and physical specifications are provided with every 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 room temperature (15-25°C). This product is hygroscopic (moisture-sensitive) and light-sensitive; prolonged exposure to moisture or direct light should be avoided to maintain stability and performance.

Specification

Item	Specification
Appearance	Dark brown to black powder or crystalline solid
Identification (IR)	Conforms to reference spectrum
Assay (HPLC)	Min. 95.0%
Water Content	Max. 5.0%
Sulfated Ash	Contact for details
Heavy Metals (as Pb)	Max. 20 ppm
Solubility (in Water)	Freely soluble

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