Description

Direct Blue 202 CAS NO 107043-92-5 is a synthetic, high-strength disazo direct dye belonging to the benzidine derivative class. It is valued for its excellent substantivity to cellulosic fibers, providing deep, vibrant blue shades with good wash and light fastness properties. This dye is primarily required by the textile industry for dyeing cotton, viscose, and other natural fibers, as well as for applications in paper coloring and leather finishing.

Application

• Textile Dyeing: Primary application for exhaust and continuous dyeing of cotton, rayon, and other cellulosic fabrics.
• Paper Coloring: Used in the production of colored papers, tissues, and paperboard to achieve consistent blue hues.
• Leather Finishing: Imparts a uniform blue color to leather goods in the tanning industry.
• Ink Formulation: A colorant component in the manufacture of certain inks for specialty printing.
• Wood Staining: Employed in stains and coatings for wood to provide decorative blue finishes.
• Research & Development: Serves as a reference standard or intermediate in chemical synthesis and analytical laboratories.

Basic Information

Product Name	Direct Blue 202
CAS No.	107043-92-5
Molecular Formula	C34H24N6Na4O16S4
Molecular Weight	996.86 g/mol
Synonyms	Direct Blue 202; C.I. Direct Blue 202; Direct Blue 2B; Direct Blue B2RL; Amanil Sky Blue 2B; Atul Direct Sky Blue 2B; Dinamine Sky Blue 2B; Sirius Supra Blue 2B; Direct Blue 2B-N; C.I. 51315
EINECS	Contact for details

Quality Control

Our Direct Blue 202 is manufactured under a stringent quality management system. Every batch is tested to ensure consistent shade, strength, and solubility. Key parameters such as purity, ash content, and fastness properties are verified against established standards. Certificates of Analysis (COA) documenting these results 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 room temperature (15-25°C). Keep away from strong oxidizing agents. The product is light-sensitive (store away from light).

Specification

Item	Specification
Appearance	Blue to Bluish-Grey Powder
Identification (IR)	Conforms to Standard
Assay (HPLC)	Min. 95%
Shade	Conforms to Standard
Strength	100 ± 3%
Moisture Content	Max. 5.0%
Water Insoluble Matter	Max. 0.5%
pH (1% Solution)	7.0 - 9.0

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