Description

3,3'-Methylenebis[6-[[2,4-Dihydroxy-5-[(4-Sulfophenyl)Azo]Phenyl]Azo]Benzoic Acid] is a high-purity, complex azo dye intermediate of significant industrial importance. Its value lies in its role as a key precursor for synthesizing high-performance dyes and pigments, offering excellent color strength and stability. This compound is essential for manufacturers in the textile, ink, and specialty coatings industries seeking to produce vibrant and durable colorants.

Application

• Primary Intermediate for Azo Dyes & Pigments: Serves as a critical building block in the synthesis of high-grade, complex azo colorants.
• Textile Dyeing: Used in the production of dyes for coloring natural and synthetic fibers, particularly where high wash and light fastness are required.
• Ink Formulation: A key component in manufacturing pigments for industrial printing inks, including packaging and publication inks.
• Specialty Coatings: Employed in creating colorants for paints, plastics, and other polymer-based coatings.
• Research & Development: Utilized in chemical research for developing new chromophores and studying azo dye chemistry.
• Analytical Reagents: Can be used as a standard or reagent in analytical chemistry for method development and calibration.

Basic Information

Product Name	3,3'-Methylenebis[6-[[2,4-Dihydroxy-5-[(4-Sulfophenyl)Azo]Phenyl]Azo]Benzoic Acid]
CAS No.	73507-51-4
Molecular Formula	C40H26N8O12S2
Molecular Weight	874.81 g/mol
Synonyms	Benzoic acid, 3,3'-methylenebis[6-[[2,4-dihydroxy-5-[(4-sulfophenyl)azo]phenyl]azo]-; CI 27290; Acid Black 210; Azo dye intermediate 73507-51-4; Bis-azo dye intermediate; 3,3'-Methylenebis(6-((2,4-dihydroxy-5-((4-sulfophenyl)diazenyl)phenyl)diazenyl)benzoic acid); 4,4'-(6,6'-((Methylenebis(3,1-phenylene))bis(diazene-2,1-diyl))bis(3,5-dihydroxy-4,1-phenylene))bis(diazene-2,1-diyl)dibenzenesulfonic acid (related form)
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 purity. Every lot undergoes comprehensive analytical testing, including HPLC for assay and impurity profiling. A detailed Certificate of Analysis (COA) documenting identity, purity, and related substances is provided with each shipment 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 a controlled room temperature (15-25°C). Due to its hygroscopic (moisture-sensitive) nature, the container must be kept tightly sealed when not in use to prevent degradation from atmospheric moisture.

Specification

Item	Specification
Appearance	Dark Brown to Black Powder
Identification (IR)	Conforms to Structure
Assay (HPLC)	≥ 95.0%
Loss on Drying	≤ 5.0%
Sulfated Ash	≤ 1.0%
Heavy Metals (as Pb)	≤ 20 ppm
Related Substances (HPLC)	Total impurities ≤ 3.0% Any single impurity ≤ 1.0%

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