Description

4,4'-[(2,2'-Dimethyl[1,1'-Biphenyl]-4,4'-Diyl)Bis(Azo)]Bis[3-Hydroxy-2,7-Naphthalenedisulfonic Acid] is a high-purity, water-soluble azo dye intermediate of significant industrial importance. This compound is valued for its ability to impart vivid and stable coloration, making it a critical precursor in the synthesis of specialized dyes and pigments. It is primarily sought by manufacturers in the textile, ink, and specialty chemical industries for producing high-performance colorants.

Application

• Primary Intermediate for Azo Dyes: A key building block for synthesizing direct, acid, and reactive azo dyes, particularly for textile applications like cotton and nylon.
• Specialty Ink Formulations: Used in the production of high-quality inks for packaging, security printing, and digital applications requiring specific color fastness.
• Functional Pigment Synthesis: Serves as a precursor for creating pigments with enhanced properties for plastics, coatings, and masterbatches.
• Laboratory Reagent & Research Chemical: Employed in chemical research and development for studying azo coupling reactions and developing novel chromophores.
• Biological Staining Agent: Potential use in the formulation of histological stains for microscopy and diagnostic applications.
• Indicator Dye Production: Can be utilized in the manufacture of pH or chemical indicator dyes for analytical and educational purposes.

Basic Information

Product Name	4,4'-[(2,2'-Dimethyl[1,1'-Biphenyl]-4,4'-Diyl)Bis(Azo)]Bis[3-Hydroxy-2,7-Naphthalenedisulfonic Acid]
CAS No.	55372-76-4
Molecular Formula	C40H28N4O14S4
Molecular Weight	924.92 g/mol
Synonyms	Acid Red 337; C.I. 17200; 4,4'-[(2,2'-Dimethyl-4,4'-biphenylylene)bis(azo)]bis[5-hydroxy-6,8-naphthalenedisulfonic acid]; 2,7-Naphthalenedisulfonic acid, 4,4'-[(2,2'-dimethyl[1,1'-biphenyl]-4,4'-diyl)bis(azo)]bis[3-hydroxy-; Direct Fast Scarlet 4BS (related dye); C.I. Acid Red 337; Azo Rubine S; Acid Leather Red D
EINECS	Contact for details

Quality Control

Our production of 4,4'-[(2,2'-Dimethyl[1,1'-Biphenyl]-4,4'-Diyl)Bis(Azo)]Bis[3-Hydroxy-2,7-Naphthalenedisulfonic Acid] adheres to stringent quality management protocols. Every batch undergoes rigorous analytical testing, including HPLC for purity and identity confirmation, to ensure consistency and compliance with customer specifications. Certificates of Analysis (COA) detailing purity, impurity profile, and physical data are provided with each shipment.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at ambient temperature (15-25°C). Keep away from strong acids and organic solvents. The product is light-sensitive (store away from light).

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	≤ 1.0%
Heavy Metals (as Pb)	≤ 20 ppm
Solubility (in Water)	Freely soluble

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