Description

2,7-Naphthalenedisulfonic Acid, 3,3'-[Azobis(4,1-Phenyleneazo) ]Bis[5-Amino-4-Hydroxy-, Tetrasodium Salt is a high-purity, water-soluble azo dye intermediate of significant industrial importance. This compound is valued for its role in synthesizing vibrant and stable dyes and pigments, particularly for demanding applications requiring excellent light and wash fastness. It is primarily sought by manufacturers in the textile, ink, and specialty coatings industries for producing high-performance colorants.

Application

• Primary Intermediate for Azo Dyes & Pigments: Serves as a key building block in the synthesis of high-grade, complex azo dyes, especially for cotton and other cellulosic fibers.
• Textile Dyeing and Printing: Used in formulations for dyes requiring superior color strength, brightness, and resistance to fading from light and washing.
• Ink Manufacturing: Employed in the production of pigments for inks used in packaging, security printing, and other high-quality printing applications.
• Specialty Coatings and Paints: A component in creating pigments for industrial and automotive coatings where durability and color consistency are critical.
• Research & Development: Utilized in chemical research for developing novel chromophores and functional materials with specific optical properties.
• Paper Coloring: Potential use in the manufacture of dyes for high-grade paper products.

Basic Information

Item	Details
Product Name	2,7-Naphthalenedisulfonic Acid, 3,3'-[Azobis(4,1-Phenyleneazo) ]Bis[5-Amino-4-Hydroxy-, Tetrasodium Salt
CAS No.	72017-89-1
Molecular Formula	C34H20N10Na4O14S4
Molecular Weight	Contact for details
Synonyms	Direct Black 22 (Tetrasodium Salt); C.I. 35435; 3,3'-[[1,1'-Biphenyl]-4,4'-diylbis(azo)]bis[5-amino-4-hydroxy-2,7-naphthalenedisulfonic acid] tetrasodium salt; Tetrasodium 3,3'-((diazene-1,2-diylbis(4,1-phenylene))bis(azo))bis(5-amino-4-hydroxy-2,7-naphthalenedisulfonate); Azo Black; Direct Black 22Na4
EINECS	Contact for details

Quality Control

Our production of this dye intermediate adheres to strict quality control protocols to ensure batch-to-batch consistency and purity suitable for industrial synthesis. Quality is verified through analytical methods including HPLC, UV-Vis spectroscopy, and titration. 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); ensure containers are sealed after each use to prevent absorption of atmospheric moisture.

Specification

Item	Specification
Appearance	Dark blue to black powder or granules
Identification (IR)	Conforms to structure
Assay (HPLC)	Min. 95%
Moisture Content	Max. 5.0%
Solubility (in Water)	Completely soluble
Heavy Metals (as Pb)	Max. 20 ppm
pH (1% Solution)	6.0 - 8.0

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