Description

Trisodium 5-Amino-3-[[4'-[(6-Amino-1-Hydroxy-3-Sulphonato-2-Naphthyl)Azo]-3,3'-Dimethoxy[1,1'-Biphenyl]-4-Yl]Azo]-4-Hydroxynaphthalene-2,7-Disulphonate is a high-purity, water-soluble polyazo dye intermediate of significant industrial importance. Its complex molecular structure, featuring multiple sulphonate groups and azo linkages, provides excellent chromophoric properties and substantivity for demanding applications. This compound is essential for manufacturers requiring precise and stable colorants in advanced material synthesis.

Application

• Specialty Dye Synthesis: A critical intermediate for producing high-grade, complex azo dyes and pigments.
• Textile Coloring: Used in the manufacture of dyes for coloring natural and synthetic fibers, particularly where high wash and light fastness are required.
• Ink Formulation: Serves as a key component in the production of industrial and specialty printing inks.
• Paper Dyeing: Employed in the production of dyes for high-quality paper and packaging materials.
• Leather Processing: Used in the synthesis of dyes for the leather tanning and finishing industry.
• Research & Development: A valuable building block for chemical research in novel chromophores and functional materials.

Basic Information

Product Name	Trisodium 5-Amino-3-[[4'-[(6-Amino-1-Hydroxy-3-Sulphonato-2-Naphthyl)Azo]-3,3'-Dimethoxy[1,1'-Biphenyl]-4-Yl]Azo]-4-Hydroxynaphthalene-2,7-Disulphonate
CAS No.	73287-56-6
Molecular Formula	C40H26N6Na3O16S4
Molecular Weight	~1084.88 g/mol
Synonyms	5-Amino-3-[[4'-[(6-amino-1-hydroxy-3-sulfo-2-naphthyl)azo]-3,3'-dimethoxy[1,1'-biphenyl]-4-yl]azo]-4-hydroxy-2,7-naphthalenedisulfonic acid trisodium salt; C.I. Direct Blue 218; Direct Blue 218; Trisodium 5-amino-3-((4'-((6-amino-1-hydroxy-3-sulphonato-2-naphthyl)azo)-3,3'-dimethoxybiphenyl-4-yl)azo)-4-hydroxynaphthalene-2,7-disulphonate; Direct Blue 2B; Azo Dye Intermediate 73287-56-6
EINECS	Contact for details

Quality Control

Our production of this advanced dye intermediate adheres to strict quality management protocols to ensure batch-to-batch consistency and high purity. Quality is verified through comprehensive analytical methods including HPLC, spectrophotometry, and titration. A Certificate of Analysis (COA) detailing identity, purity, 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 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 product performance.

Specification

Item	Specification
Appearance	Dark blue to black powder or solid
Identification (IR)	Conforms to structure
Assay (HPLC)	Min. 95%
Moisture Content	Max. 5.0%
Water Solubility	Freely soluble
Sulfated Ash	Contact for details
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.