Description

5-[[2,4-Dihydroxy-5-[(4-nitrophenyl)azo]phenyl]azo]-4-hydroxy-3-[[6-sulfo-4-[(4-sulfo-1-naphthalenyl)azo]-1-naphthalenyl]azo]-2,7-naphthalenedisulfonic acid tetrasodium salt is a high-purity, complex azo dye intermediate essential for producing vibrant and durable colorants. Its multi-azo and sulfonic acid group structure provides exceptional chromophore strength and water solubility, making it a critical component for advanced dye synthesis. This compound is primarily required by manufacturers in the textile, ink, and specialty coatings industries seeking to develop high-performance pigments with excellent light and wash fastness.

Application

• Textile Dyeing: As a key intermediate for synthesizing reactive and direct dyes for cotton, wool, and nylon, offering brilliant shades and superior fastness properties.
• Ink Manufacturing: Used in the production of high-quality inks for digital printing, packaging, and security applications requiring intense color and stability.
• Specialty Coatings: Serves as a pigment precursor in industrial and automotive coatings where color consistency and durability are paramount.
• Paper Coloring: Employed in the manufacture of dyes for high-grade paper and cardboard products.
• Leather Finishing: Utilized in dye formulations for leather goods, providing deep, uniform coloration.
• Research & Development: Acts as a standard or building block in chemical R&D for developing novel chromophores and functional dyes.

Basic Information

Item	Details
Product Name	5-[[2,4-Dihydroxy-5-[(4-nitrophenyl)azo]phenyl]azo]-4-hydroxy-3-[[6-sulfo-4-[(4-sulfo-1-naphthalenyl)azo]-1-naphthalenyl]azo]-2,7-naphthalenedisulfonic acid tetrasodium salt
CAS No.	72749-76-9
Molecular Formula	C40H21N8Na4O19S4
Molecular Weight	~1132.8 g/mol (Contact for exact details)
Synonyms	Acid Black 210; C.I. 300310; Tetrasodium 5-[[2,4-dihydroxy-5-[(4-nitrophenyl)azo]phenyl]azo]-4-hydroxy-3-[[6-sulfo-4-[(4-sulfo-1-naphthalenyl)azo]-1-naphthalenyl]azo]-2,7-naphthalenedisulfonate; Azo Dye Intermediate 72749-76-9; 5-[(2,4-Dihydroxy-5-[(4-nitrophenyl)azo]phenyl)azo]-4-hydroxy-3-[(6-sulfo-4-[(4-sulfo-1-naphthalenyl)azo]-1-naphthalenyl)azo]naphthalene-2,7-disulfonic acid tetrasodium salt
EINECS	Contact for details

Quality Control

Our production of this advanced dye intermediate adheres to strict quality management systems to ensure batch-to-batch consistency and purity. Every lot undergoes comprehensive analytical testing, including HPLC for purity, spectrophotometry for color strength, and wet chemistry for functional group verification. A Certificate of Analysis (COA) detailing all specifications is provided with each shipment to support your quality assurance and regulatory compliance needs.

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). This material is hygroscopic (moisture-sensitive); the container must be kept tightly sealed to prevent absorption of atmospheric moisture, which can affect product performance and handling.

Specification

Item	Specification
Appearance	Dark colored powder or solid
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Color Strength	95 - 105% (vs. Standard)
Moisture Content (KF)	≤ 5.0%
Ash Content	Contact for details
Heavy Metals (as Pb)	≤ 20 ppm
Solubility (in Water)	Clear solution

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