Description

7-Hydroxy-8-[[4'-[(2-Hydroxy-8-Sulpho-1-Naphthyl)Azo][1,1'-Biphenyl]-4-Yl]Azo]Naphthalene-1,3-Disulphonic Acid, Sodium Salt is a high-purity, polyazo dye intermediate characterized by its multiple sulphonic acid groups, which confer excellent water solubility and substantivity. This compound is valued for its ability to form strong, vibrant color complexes with metal ions, making it a critical component in the synthesis of high-performance dyes and pigments. It is primarily sought after by manufacturers in the textile, leather, and specialty ink industries who require consistent, high-quality intermediates for producing colorants with superior fastness properties.

Application

• Primary Intermediate for Metal-Complex Dyes: Used in the synthesis of pre-metallized dyes for wool, nylon, and leather, providing excellent wash and light fastness.
• Textile Dye Manufacturing: A key building block for producing acid dyes and direct dyes used on silk, wool, and polyamide fibers.
• Leather Coloring Agent: Employed in the formulation of dyes for high-quality leather finishing, ensuring deep, uniform penetration and color stability.
• Specialty Ink Production: Used in the manufacture of inks for security printing, jet printing, and other applications requiring specific chromatic and chemical properties.
• Paper Dye Synthesis: Serves as an intermediate for dyes used in the coloring of high-grade paper and paper products.
• Research & Development: Utilized in chemical research for developing new chromophores and studying azo dye chemistry and applications.

Basic Information

Item	Details
Product Name	7-Hydroxy-8-[[4'-[(2-Hydroxy-8-Sulpho-1-Naphthyl)Azo][1,1'-Biphenyl]-4-Yl]Azo]Naphthalene-1,3-Disulphonic Acid, Sodium Salt
CAS No.	94200-00-7
Molecular Formula	C32H18N4O11S3•Na3 (or related sodium salt form)
Molecular Weight	Contact for details
Synonyms	Acid Black 210; C.I. 300310; 7-Hydroxy-8-({4'-[(2-hydroxy-8-sulfo-1-naphthyl)azo][1,1'-biphenyl]-4-yl}azo)naphthalene-1,3-disulfonic acid trisodium salt; Trisodium 7-hydroxy-8-[[4'-[(2-hydroxy-8-sulphonato-1-naphthyl)azo]biphenyl-4-yl]azo]naphthalene-1,3-disulphonate; Polyazo dye intermediate; Leather Black Dye Intermediate; Azo Dye for Polyamide
EINECS	Contact for details

Quality Control

Our production of 7-Hydroxy-8-[[4'-[(2-Hydroxy-8-Sulpho-1-Naphthyl)Azo][1,1'-Biphenyl]-4-Yl]Azo]Naphthalene-1,3-Disulphonic Acid, Sodium Salt adheres to a stringent quality management system. Every batch undergoes comprehensive analytical testing, including HPLC for purity and identity confirmation, to ensure it meets precise specifications for dye intermediate applications. Certificates of Analysis (COA) documenting purity, impurity profile, and physical characteristics are provided to guarantee traceability and consistency for our industrial partners.

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) and light-sensitive; therefore, containers must be kept tightly sealed when not in use to prevent absorption of moisture from the atmosphere, which can affect product performance.

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%
Water Solubility	Freely soluble
Heavy Metals (as Pb)	Max. 20 ppm
Related Substances (HPLC)	Individual impurity: Max. 1.0% Total impurities: Max. 3.0%

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