Description

4-Hydroxy-7-[[4-[[4-[(1-Hydroxy-4-Sodiosulfo-2-Naphthalenyl)Azo]Benzoyl]Amino]Benzoyl]Amino]-3-[(4-Methoxyphenyl)Azo]Naphthalene-2-Sulfonic Acid Sodium Salt is a high-purity, complex azo dye intermediate essential for producing vivid and stable colorants. Its value lies in its precise molecular structure, which enables the synthesis of specialized dyes with excellent lightfastness and color strength for demanding applications. This compound is a critical raw material for manufacturers in the textile, ink, and specialty polymer industries seeking to develop high-performance pigments.

Application

• Primary Intermediate for Azo Dyes: Serves as a key building block in the synthesis of high-grade, polyazo direct and reactive dyes for textiles like cotton and viscose.
• Specialty Ink Formulations: Used in the production of pigments for inks requiring high color intensity and stability, including packaging and security inks.
• Functional Colorants for Polymers: Imparts color to engineering plastics and synthetic fibers where thermal stability and migration resistance are paramount.
• Research & Development: Employed in academic and industrial R&D for developing novel chromophores and studying structure-property relationships in dye chemistry.
• Paper Coloring: Potential use in the manufacture of dyes for high-quality paper and specialty board products.

Basic Information

Item	Details
Product Name	4-Hydroxy-7-[[4-[[4-[(1-Hydroxy-4-Sodiosulfo-2-Naphthalenyl)Azo]Benzoyl]Amino]Benzoyl]Amino]-3-[(4-Methoxyphenyl)Azo]Naphthalene-2-Sulfonic Acid Sodium Salt
CAS No.	6854-78-0
Molecular Formula	C41H27N6Na2O11S2
Molecular Weight	912.80 g/mol
Synonyms	Direct Blue 71 (principal commercial name); C.I. 34140; Amanil Sky Blue 6BX; Atul Direct Sky Blue 6BX; Benzo Sky Blue; Chloramine Sky Blue 6BX; Diazol Sky Blue 6BX; Diphenyl Sky Blue 6BX; Sirius Supra Blue 6BX
EINECS	229-949-9

Quality Control

Our production of this dye intermediate adheres to stringent quality protocols to ensure batch-to-batch consistency and performance. Quality is verified through comprehensive analytical methods including HPLC for purity and spectrophotometry for color strength. A Certificate of Analysis (COA) detailing assay, impurity profile, and physical specifications is provided with every shipment to support your quality assurance systems.

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). The product is hygroscopic (moisture-sensitive); keep the container tightly sealed when not in use to prevent absorption of atmospheric moisture.

Specification

Item	Specification
Appearance	Dark blue to bluish-black powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Moisture Content	≤ 5.0%
Sulfated Ash	≤ 20.0%
Water Solubility	Freely 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.