Description

2,7-Naphthalenedisulfonic Acid, 5-Amino-4-Hydroxy-3-[[4'- [(1-Hydroxy-4-Sulfo-2-Naphthalenyl)Azo]-3,3'-Dimethoxy [1,1'-Biphenyl]-4-Yl]Azo]-, Trisodium Salt is a high-purity, water-soluble azo dye intermediate of significant industrial importance. This compound is valued for its role in synthesizing complex, high-performance dyes and pigments with excellent color fastness and stability. It is primarily sought by manufacturers in the textile, leather, and specialty ink industries for producing vivid and durable colorants.

Application

• Textile Dyeing: A key intermediate for the synthesis of reactive and direct dyes used on cotton, wool, and nylon fibers.
• Leather Coloring: Used in the production of dyes for imparting deep, uniform colors to leather goods.
• Ink Manufacturing: Serves as a precursor for pigments in high-quality printing inks, including inks for packaging and security applications.
• Paper Coloring: Employed in the manufacture of dyes for specialty and decorative papers.
• Research & Development: Used as a standard or building block in chemical research for developing new chromophores and functional materials.

Basic Information

Product Name	2,7-Naphthalenedisulfonic Acid, 5-Amino-4-Hydroxy-3-[[4'- [(1-Hydroxy-4-Sulfo-2-Naphthalenyl)Azo]-3,3'-Dimethoxy [1,1'-Biphenyl]-4-Yl]Azo]-, Trisodium Salt
CAS No.	75673-20-0
Molecular Formula	C34H23N5Na3O14S3
Molecular Weight	898.79 g/mol (approx.)
Synonyms	Trisodium 5-amino-4-hydroxy-3-[[4'-[(1-hydroxy-4-sulfo-2-naphthyl)azo]-3,3'-dimethoxy[1,1'-biphenyl]-4-yl]azo]-2,7-naphthalenedisulfonate; C.I. Direct Brown 223; Direct Brown 223; Azo Dye Intermediate Brown 223; 5-Amino-4-hydroxy-3-((4'-((1-hydroxy-4-sulfo-2-naphthyl)azo)-3,3'-dimethoxy(1,1'-biphenyl)-4-yl)azo)-2,7-naphthalenedisulfonic acid trisodium salt
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 for optimal performance in downstream synthesis. 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 support your quality assurance processes.

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 material is hygroscopic (moisture-sensitive); keep the container tightly sealed to prevent absorption of atmospheric moisture.

Specification

Item	Specification
Appearance	Dark brown to black powder or solid
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Moisture Content	≤ 5.0%
Solubility (in Water)	Completely soluble
Heavy Metals (as Pb)	≤ 20 ppm

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