Description

8,8'-[1,2-Ethenediylbis[(3-Sulfo-4,1-Phenylene)Azo]]Bis[4-Amino-5-Hydroxy-1,3-Naphthalenedisulfonic Acid]Hexasodium Salt is a high-purity, water-soluble azo dye intermediate of significant commercial importance. Its complex poly-sulfonated structure provides excellent solubility and binding properties, making it a critical precursor for the synthesis of specialized dyes and pigments. This compound is essential for manufacturers in the textile, ink, and specialty chemical industries seeking to produce vivid, stable colors with specific functional characteristics.

Application

• Primary Intermediate for Reactive Dyes: Key building block for synthesizing high-grade reactive dyes used in cotton and cellulose fiber dyeing.
• Specialty Pigment Manufacturing: Used in the production of high-performance pigments for inks, coatings, and plastics requiring enhanced color strength and lightfastness.
• Biological Staining Agent Precursor: Serves as a starting material for certain histological and cytological stains used in laboratory diagnostics.
• Functional Dye Synthesis: Intermediate for creating functional dyes used in sensitized solar cells, optical data storage, and other advanced material applications.
• Textile Printing Inks: A crucial component in formulating specialized inks for digital and screen printing on textiles.
• Research & Development: Used in chemical research for developing new chromophores and studying azo dye chemistry and properties.

Basic Information

Product Name	8,8'-[1,2-Ethenediylbis[(3-Sulfo-4,1-Phenylene)Azo]]Bis[4-Amino-5-Hydroxy-1,3-Naphthalenedisulfonic Acid]Hexasodium Salt
CAS No.	71550-30-6
Molecular Formula	C34H18N6Na6O22S6
Molecular Weight	~1256.0 g/mol (as hexasodium salt)
Synonyms	Reactive Black 5 Intermediate; Direct Black 22 Intermediate; C.I. 20505; Hexasodium 4-amino-5-hydroxy-3,6-bis[[4-[(2-sulfophenyl)azo]phenyl]azo]naphthalene-2,7-disulfonate; 4-Amino-5-hydroxy-3,6-bis((4-((2-sulfophenyl)azo)phenyl)azo)-2,7-naphthalenedisulfonic Acid Hexasodium Salt; Azo Dye Intermediate 71550-30-6; Bisazo Tetrasulfonic Acid Sodium Salt
EINECS	Contact for details

Quality Control

Our production of this azo dye intermediate adheres to strict quality management systems to ensure batch-to-batch consistency and high purity. Every lot undergoes comprehensive analysis, including HPLC for purity and assay, spectrophotometry for color value, and tests for residual solvents and inorganic salts. A detailed Certificate of Analysis (COA) documenting identity, purity, and specific impurities is provided with each shipment to support your quality assurance protocols.

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). Due to its hygroscopic nature, the container must be kept tightly sealed after opening to prevent moisture absorption, which can affect product stability and handling properties. Keep away from incompatible materials.

Specification

Item	Specification
Appearance	Dark blue to black powder or crystalline solid
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Color Strength	≥ 98% of standard
Moisture (KF)	≤ 5.0%
Water Solubility	Clear solution
Heavy Metals (as Pb)	≤ 20 ppm
Residual Solvents (GC)	Meets ICH guidelines

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