Description

Direct Blue 90 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 used in the textile industry for dyeing and printing cotton, viscose, and other regenerated cellulose materials, as well as in the paper and leather industries.

Application

• Textile Dyeing: Exhaust dyeing of cotton, rayon, and other cellulosic fabrics to achieve deep navy and black shades.
• Textile Printing: Used in printing pastes for direct and discharge printing on cellulose-based textiles.
• Paper Coloring: Imparting color to paper pulp for the production of colored papers and boards.
• Leather Finishing: Dyeing of leather goods, offering good penetration and color uniformity.
• Ink Formulation: A colorant component in certain types of inks for specialized applications.

Basic Information

Product Name	Direct Blue 90
CAS No.	12217-56-0
Molecular Formula	C34H24N6Na4O16S4
Molecular Weight	1020.82 g/mol
Synonyms	Direct Blue 2B; C.I. Direct Blue 90; Direct Navy Blue 2B; Amanil Navy Blue 2B; Atlantic Navy Blue 2B; Benzo Navy Blue 2B; Chlorantine Navy Blue 2B; Diazol Navy Blue 2B; Pontamine Navy Blue 2B; Sirius Navy Blue 2B; Solophenyl Navy Blue 2B
EINECS	Contact for details

Quality Control

Our Direct Blue 90 is manufactured under a stringent quality management system. Each batch is tested to ensure consistent shade, strength, and application performance. Key parameters such as color strength, solubility, and fastness properties are verified against established standards. A Certificate of Analysis (COA) detailing purity, physical properties, and performance characteristics is provided with every shipment.

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 hygroscopic (moisture-sensitive); ensure containers are sealed after use to prevent moisture absorption and caking.

Specification

Item	Specification
Appearance	Dark Blue to Black Powder
Identification	Conforms (IR / TLC)
Color Strength	100 ± 3% (vs. Standard)
Moisture Content	≤ 5.0%
Water Insoluble Matter	≤ 1.0%
Shade	Conforms to Standard
Solubility in Water	Conforms
Fastness Properties (Typical)	Light: 4-5; Wash: 3-4

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