Description

4-Amino-3-[[4'-[(1-Hydroxy-4-Sulfo-2-Naphtyl)Azo]-3,3'-Dimethyl-1,1'-Biphenyl-4-Yl]Azo]-1-Naphthalenesulfonic Acid Disodium Salt is a high-purity, water-soluble azo dye intermediate essential for producing vibrant and stable colorants. Its complex, multi-azo structure provides excellent chromophoric properties, making it a critical component for achieving specific, high-performance hues. This compound is primarily sought by manufacturers in the textile dyeing, ink formulation, and specialty pigment industries who require consistent quality and reliable supply for their production processes.

Application

• Textile Dyeing: A key intermediate for synthesizing high-grade, wash-fast azo dyes for cotton, wool, and synthetic fibers.
• Ink Manufacturing: Used in the production of pigments for industrial inks, including packaging and printing inks, requiring strong color strength.
• Specialty Pigments: Serves as a precursor for creating complex organic pigments used in plastics, coatings, and artistic materials.
• Leather Coloring: Employed in the formulation of dyes for the leather tanning and finishing industry.
• Paper Coloring: Used in the manufacture of dyes for specialty paper products.
• Research & Development: A valuable chemical for R&D laboratories focusing on novel dye synthesis and color chemistry.

Basic Information

Product Name	4-Amino-3-[[4'-[(1-Hydroxy-4-Sulfo-2-Naphtyl)Azo]-3,3'-Dimethyl-1,1'-Biphenyl-4-Yl]Azo]-1-Naphthalenesulfonic Acid Disodium Salt
CAS No.	6470-45-7
Molecular Formula	C40H26N6Na2O8S2
Molecular Weight	852.78 g/mol
Synonyms	Acid Red 299; C.I. 18130; Direct Red 81; 4-Amino-3-{[4'-[(1-hydroxy-4-sulfo-2-naphthyl)azo]-3,3'-dimethyl[1,1'-biphenyl]-4-yl]azo}-1-naphthalenesulfonic acid disodium salt; 2-Naphthalenesulfonic acid, 4-amino-3-((4'-((1-hydroxy-4-sulfo-2-naphthalenyl)azo)(1,1'-biphenyl)-4-yl)azo)-, disodium salt; Disodium 4-amino-3-{[4'-[(1-hydroxy-4-sulphonato-2-naphthyl)azo]-3,3'-dimethylbiphenyl-4-yl]azo}naphthalene-1-sulphonate
EINECS	229-304-8

Quality Control

Our production of this azo dye intermediate adheres to strict quality management protocols to ensure batch-to-batch consistency and high purity. Each lot is analyzed using advanced techniques like HPLC to verify identity and assay. A comprehensive Certificate of Analysis (COA) detailing purity, impurity profile, and physical specifications is provided with every shipment to support your quality assurance and regulatory compliance needs.

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). Due to its hygroscopic nature, the container must be kept tightly sealed to prevent moisture absorption, which can affect product stability and handling properties.

Specification

Item	Specification
Appearance	Dark red to brown powder
Identification (IR)	Conforms to structure
Assay (HPLC)	Min. 95%
Moisture Content	Max. 5.0%
Water Solubility	Freely soluble
Heavy Metals (as Pb)	Max. 20 ppm
Related Substances (HPLC)	Total impurities ≤ 5.0%

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