Description

4-Amino-6-[[4'-[(8-Amino-1-Hydroxy-3,6-Disulfo-2-Naphthalenyl)Azo]-3,3'-Dimethoxy[1,1'-Biphenyl]-4-Yl]Azo]-5-Hydroxy-1,3-Naphthalenedisulfonic Acid Tetrasodium Salt is a high-purity, water-soluble azo dye intermediate of significant industrial importance. Its complex polyazo structure provides exceptional chromophoric properties, making it a critical precursor for synthesizing high-value, color-intensive dyes and pigments. This compound is essential for manufacturers in the textile, ink, and specialty coatings industries seeking to produce deep, vibrant, and stable colors.

Application

• Primary Intermediate for Reactive Dyes: Key building block for synthesizing high-grade reactive dyes used in cotton and cellulose fiber dyeing.
• Production of Direct Dyes: Used in the manufacture of direct dyes for paper, leather, and textile applications requiring good wet fastness.
• Specialty Pigment Synthesis: Serves as a precursor for creating complex organic pigments used in high-performance inks and coatings.
• Research & Development: Employed in chemical R&D for developing novel chromophores and studying azo dye chemistry and properties.
• Analytical Chemistry: Can be used as a standard or reagent in analytical methods for dye identification and quantification.

Basic Information

Item	Detail
Product Name	4-Amino-6-[[4'-[(8-Amino-1-Hydroxy-3,6-Disulfo-2-Naphthalenyl)Azo]-3,3'-Dimethoxy[1,1'-Biphenyl]-4-Yl]Azo]-5-Hydroxy-1,3-Naphthalenedisulfonic Acid Tetrasodium Salt
CAS No.	3443-04-7
Molecular Formula	C40H26N6Na4O18S4
Molecular Weight	1086.88 g/mol
Synonyms	Direct Blue 71 (Tetrasodium Salt); C.I. 34140; Amanil Sky Blue FF; Pontamine Sky Blue 6BX; Tetrasodium 4-amino-6-[[4'-[(8-amino-1-hydroxy-3,6-disulphonato-2-naphthyl)azo]-3,3'-dimethoxybiphenyl-4-yl]azo]-5-hydroxynaphthalene-1,3-disulphonate; Benzo Sky Blue; Sirius Supra Blue FBL; C.I. Direct Blue 71
EINECS	222-349-8

Quality Control

Our production of 4-Amino-6-[[4'-[(8-Amino-1-Hydroxy-3,6-Disulfo-2-Naphthalenyl)Azo]-3,3'-Dimethoxy[1,1'-Biphenyl]-4-Yl]Azo]-5-Hydroxy-1,3-Naphthalenedisulfonic Acid Tetrasodium Salt adheres to stringent quality management protocols. Every batch undergoes comprehensive analytical testing to ensure consistent purity, color strength, and chemical identity. Certificates of Analysis (COA) detailing key parameters such as assay, impurity profile, and solubility are provided to guarantee supply reliability and performance consistency for your manufacturing 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 product is hygroscopic (moisture-sensitive). Keep the container tightly sealed when not in use to prevent absorption of atmospheric moisture, which can affect purity and handling properties. Keep away from incompatible materials.

Specification

Item	Specification
Appearance	Dark Blue to Bluish-Black Powder
Identification (IR)	Conforms to Structure
Assay (HPLC)	≥ 95.0%
Moisture Content	≤ 5.0%
Water Solubility	Freely Soluble
Heavy Metals (as Pb)	≤ 20 ppm
pH (1% Solution)	7.0 - 9.0

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