Description

4-[[2,6-Dihydroxy-3-[(7-Sulfo-1-Naphthalenyl)Azo]Phenyl]Azo]-1-Naphthalenesulfonic Acid Disodium Salt is a high-purity, water-soluble azo dye intermediate valued for its precise chromophoric properties and excellent batch-to-batch consistency. This compound is essential for producing vivid and stable colorants, particularly in applications requiring specific shades of red, brown, or black with good light and wash fastness. It is primarily needed by manufacturers in the textile dyeing, leather finishing, ink formulation, and specialty paper coloring industries.

Application

• Textile Dyeing: A key intermediate for synthesizing direct and acid dyes for coloring cotton, wool, silk, and nylon fibers.
• Leather Processing: Used in the production of dyes for imparting deep, uniform color to finished leather goods.
• Ink Manufacturing: Serves as a precursor for pigments and dyes used in printing inks, including for packaging and publications.
• Paper Coloring: Employed in the manufacture of dyes for specialty papers, decorative papers, and security paper applications.
• Biological Staining: Potential use as an intermediate for histological stains in laboratory and diagnostic settings.
• Research & Development: Used as a standard or building block in chemical research for developing new functional dyes and colorants.

Basic Information

Product Name	4-[[2,6-Dihydroxy-3-[(7-Sulfo-1-Naphthalenyl)Azo]Phenyl]Azo]-1-Naphthalenesulfonic Acid Disodium Salt
CAS No.	68959-18-2
Molecular Formula	C26H16N4O9S2•2Na
Molecular Weight	638.52 g/mol
Synonyms	Acid Black 210; C.I. 28440; 1-Naphthalenesulfonic acid, 4-[[2,6-dihydroxy-3-[(7-sulfo-1-naphthalenyl)azo]phenyl]azo]-, disodium salt; Disodium 4-[(2,6-dihydroxy-3-[(7-sulfonaphthalen-1-yl)diazenyl]phenyl)diazenyl]naphthalene-1-sulfonate; C.I. Acid Black 210; Azo Black Dye Intermediate; Leather Black Dye Intermediate
EINECS	Contact for details

Quality Control

Our production of 4-[[2,6-Dihydroxy-3-[(7-Sulfo-1-Naphthalenyl)Azo]Phenyl]Azo]-1-Naphthalenesulfonic Acid Disodium Salt adheres to stringent quality management protocols to ensure high purity and performance consistency for industrial applications. Every batch is analyzed using advanced techniques like HPLC and spectrophotometry to confirm identity, strength, and impurity profiles. Certificates of Analysis (COA) detailing all critical specifications are available upon request to support your quality assurance and regulatory 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). This material is light-sensitive (store away from light) and hygroscopic (moisture-sensitive); prolonged exposure to humidity or direct light should be avoided to maintain stability and color strength.

Specification

Item	Specification
Appearance	Dark brown to black powder or granules
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.