Description

3,3'-Ureylenebis[(3-Methyl-4,1-Phenylene)Azo]Bis[1,5-Naphthalenedisulfonic Acid Disodium] Salt is a high-purity, water-soluble azo dye intermediate of significant industrial importance. Its complex, multi-sulfonated structure provides excellent solubility and binding properties, making it a critical precursor for the synthesis of specialized dyes and pigments. This compound is essential for manufacturers in the textile, ink, and specialty chemical sectors seeking to produce vivid, stable colors with specific technical characteristics.

Application

• Primary Intermediate for Azo Dyes: Serves as a key building block in the synthesis of high-performance, water-soluble azo dyes for textiles and leather.
• Specialty Pigment Manufacturing: Used in the production of pigments for inks, coatings, and plastics requiring enhanced color strength and stability.
• Biological Staining Reagent: Potential use as a precursor or direct agent in histological stains and biological indicators due to its chromogenic azo groups.
• Analytical Chemistry: Can be employed as a complexometric indicator or a reagent in specific colorimetric detection methods.
• Research & Development: Utilized in chemical research for developing new chromophores, sensors, and functional materials.

Basic Information

Item	Details
Product Name	3,3'-Ureylenebis[(3-Methyl-4,1-Phenylene)Azo]Bis[1,5-Naphthalenedisulfonic Acid Disodium] Salt
CAS No.	29267-79-6
Molecular Formula	C40H28N8O14S4Na2 (or similar based on hydration state)
Molecular Weight	Contact for details
Synonyms	Acid Red 337; C.I. 17200; 3,3'-Ureylenebis(6-methyl-4-phenylazo-1,5-naphthalenedisulfonic acid) disodium salt; Disodium 3,3'-ureylenebis[(3-methyl-4,1-phenylene)azo]bis[1,5-naphthalenedisulfonate]; Azo dye intermediate 29267-79-6; C.I. Acid Red 337; Mordant dye intermediate; Tetrasulfonated azo dye precursor
EINECS	Contact for details

Quality Control

Our 3,3'-Ureylenebis[(3-Methyl-4,1-Phenylene)Azo]Bis[1,5-Naphthalenedisulfonic Acid Disodium] Salt is produced under a strict quality management system. Every batch undergoes comprehensive analytical testing to ensure identity, purity, and consistency. A Certificate of Analysis (COA) detailing key parameters such as assay, impurity profile, and physical properties is provided with each shipment to guarantee it meets your specific application requirements.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, well-ventilated area at room temperature (15-25°C). This material is hygroscopic (moisture-sensitive); keep the container tightly sealed when not in use to prevent absorption of atmospheric moisture, which may affect product performance.

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	Contact for details
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.