Description

4-Amino-5-Hydroxy-3-[[4'-[[4-Hydroxy-2-[(o-Tolyl)Amino]Phenyl]Azo][1,1'-Biphenyl]-4-Yl]Azo]-6-[(4-Sulphophenyl)Azo]Naphthalene-2,7-Disulphonic Acid, Sodium Salt is a high-purity, water-soluble azo dye intermediate of significant industrial importance. Its complex polyazo structure is engineered to deliver superior color strength, brightness, and excellent fastness properties in demanding applications. This compound is essential for manufacturers requiring reliable and consistent performance in the production of specialized dyes and pigments for textiles, inks, and advanced materials.

Application

• Primary Intermediate for Polyazo Dyes: Serves as a critical building block in the synthesis of high-grade, black, and dark-colored direct and reactive dyes for cotton and cellulose fibers.
• Textile Dyeing and Printing: Used in formulations for textiles requiring deep, vibrant shades with good wash and light fastness.
• Ink Manufacturing: A key component in producing pigments for specialty printing inks, including packaging and security inks.
• Leather Coloring: Employed in dye systems for leather to achieve rich, durable colors.
• Paper Dyeing: Suitable for coloring paper products where color uniformity and stability are required.
• Research & Development: Used in chemical research for developing new chromophores and studying azo dye chemistry and properties.

Basic Information

Product Name	4-Amino-5-Hydroxy-3-[[4'-[[4-Hydroxy-2-[(o-Tolyl)Amino]Phenyl]Azo][1,1'-Biphenyl]-4-Yl]Azo]-6-[(4-Sulphophenyl)Azo]Naphthalene-2,7-Disulphonic Acid, Sodium Salt
CAS No.	98705-48-7
Molecular Formula	C51H36N8O11S3 · xNa
Molecular Weight	Contact for details
Synonyms	Direct Black 22 (sodium salt); C.I. 35435; Polyazo black dye intermediate; 4-Amino-5-hydroxy-3,6-bis[[4'-[4-hydroxy-2-(2-methylphenyl)amino]phenyl]azo][1,1'-biphenyl]-4-yl]azo]naphthalene-2,7-disulfonic acid sodium salt; Azo Black G; Benzidine Black; Tetrakisazo dye intermediate; Sodium 4-amino-5-hydroxy-3,6-bis[[4'-[4-hydroxy-2-(2-methylphenyl)amino]phenyl]azo][1,1'-biphenyl]-4-yl]azo]naphthalene-2,7-disulfonate
EINECS	Contact for details

Quality Control

Our production of this advanced dye intermediate adheres to strict quality management protocols to ensure batch-to-batch consistency and performance reliability. Quality is verified through comprehensive analytical testing, including HPLC for purity and identity confirmation. A Certificate of Analysis (COA) detailing specific lot results for assay, impurity profile, and physical specifications 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). Due to its hygroscopic (moisture-sensitive) nature, the container must be kept tightly sealed to prevent absorption of atmospheric moisture. Keep away from incompatible materials such as strong oxidizing agents.

Specification

Item	Specification
Appearance	Dark blue-black to black powder or granules
Identification (IR)	Conforms to structure
Assay (HPLC)	Min. 95%
Moisture Content	Max. 5.0%
Water Solubility	Freely soluble
pH (1% Solution)	6.0 - 8.0
Heavy Metals (as Pb)	Max. 20 ppm
Related Substances (HPLC)	Total impurities: Max. 3.0%

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