Description

4,4'-Bis[(2-Methyl-1H-Indol-3-Yl)Azo]-1,1'-Biphenyl-2,2'-Disulfonic Acid Disodium Salt is a high-purity, synthetic azo dye intermediate of significant commercial importance. This compound is valued for its ability to impart vivid and stable coloration, making it a critical component in advanced dye manufacturing. It is primarily sought after by producers of specialty dyes and pigments for applications in textiles, inks, and high-performance materials where consistent quality and batch-to-batch reliability are paramount.

Application

• Primary intermediate in the synthesis of high-value azo dyes and pigments for textiles and fibers.
• Key component in manufacturing colorants for inks, including those used in printing and packaging.
• Used in the production of specialized pigments for plastics and polymers to achieve specific color fastness.
• Potential use as a biological stain or histochemical dye in laboratory and diagnostic applications due to its chromophoric properties.
• Employed in research and development of novel functional dyes for optoelectronic applications.

Basic Information

Product Name	4,4'-Bis[(2-Methyl-1H-Indol-3-Yl)Azo]-1,1'-Biphenyl-2,2'-Disulfonic Acid Disodium Salt
CAS No.	6375-54-8
Molecular Formula	C34H24N6Na2O6S2
Molecular Weight	730.70 g/mol
Synonyms	Acid Red 266; C.I. 17200; 1,1'-Biphenyl-2,2'-disulfonic acid, 4,4'-bis[(2-methyl-1H-indol-3-yl)azo]-, disodium salt; Disodium 4,4'-bis(2-methyl-3-indolylazo)biphenyl-2,2'-disulphonate; 4,4'-Bis(2-methyl-3-indolylazo)biphenyl-2,2'-disulfonic acid disodium salt; Azo dye intermediate 6375-54-8
EINECS	228-928-9

Quality Control

Our production of 4,4'-Bis[(2-Methyl-1H-Indol-3-Yl)Azo]-1,1'-Biphenyl-2,2'-Disulfonic Acid Disodium 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 exacting specifications for dye intermediate applications. Certificates of Analysis (COA) documenting all critical parameters are available upon request to support your quality assurance protocols.

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 after opening to prevent degradation from atmospheric moisture.

Specification

Item	Specification
Appearance	Dark red to brown powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Loss on Drying	≤ 5.0%
Sulfated Ash	≤ 20.0%
Heavy Metals (as Pb)	≤ 20 ppm
Solubility (Water)	Passes test

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