Description

5-[[4-[(4-Amino-7-Sulfo-1-Naphthalenyl)Azo]Phenyl]Azo]-2-Hydroxybenzoic Acid is a high-purity, synthetic azo dye intermediate of significant commercial importance. Its complex molecular structure, featuring multiple azo linkages and functional groups, makes it a critical precursor for producing specialized dyes and pigments. This compound is essential for manufacturers in the textile, ink, and specialty chemical industries seeking to develop products with specific coloristic and performance properties. The CAS number for this compound is provided in the basic information below.

Application

This versatile azo intermediate is engineered for high-performance applications where color strength and molecular stability are paramount.

• Textile Dye Synthesis: A key building block for manufacturing acid dyes and direct dyes used on nylon, silk, wool, and paper.
• Inkjet Ink Pigments: Used in the production of high-quality pigments for industrial and commercial printing inks, offering excellent color fidelity.
• Functional Dye Production: Serves as a precursor for dyes used in biological staining, pH indicators, and other analytical reagents.
• Specialty Polymer Colorants: Incorporated into the synthesis of colorants for plastics and synthetic fibers requiring high thermal stability.
• Research & Development: Utilized in chemical research for developing novel chromophores and studying azo compound chemistry.

Basic Information

Item	Detail
Product Name	5-[[4-[(4-Amino-7-Sulfo-1-Naphthalenyl)Azo]Phenyl]Azo]-2-Hydroxybenzoic Acid
CAS No.	71393-87-8
Molecular Formula	C23H16N6O6S
Molecular Weight	504.47 g/mol
Synonyms	Acid Black 210; C.I. 28440; 5-[(4-[(4-Amino-7-sulfo-1-naphthyl)azo]phenyl)azo]salicylic acid; 2-Hydroxy-5-[(4-[(4-amino-7-sulfo-1-naphthyl)azo]phenyl)azo]benzoic acid; Azo dye intermediate 71393-87-8; Benzoic acid, 5-[[4-[(4-amino-7-sulfo-1-naphthalenyl)azo]phenyl]azo]-2-hydroxy-; C.I. Acid Black 210
EINECS	Contact for details

Quality Control

Our production of 5-[[4-[(4-Amino-7-Sulfo-1-Naphthalenyl)Azo]Phenyl]Azo]-2-Hydroxybenzoic Acid adheres to stringent quality management protocols. Every batch is analyzed to ensure consistent purity, color strength, and chemical composition. Certificates of Analysis (COA) documenting key parameters such as assay, impurity profile, and physical 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). Due to its hygroscopic (moisture-sensitive) nature, the container must be kept sealed to prevent absorption of atmospheric moisture, which can affect product stability and performance.

Specification

Item	Specification
Appearance	Dark brown to black powder or crystalline solid
Identification (IR)	Conforms to structure
Assay (HPLC)	Min. 95%
Moisture Content	Max. 2.0%
Ash Content	Max. 0.5%
Water Solubility	Soluble
Heavy Metals (as Pb)	Max. 20 ppm

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