Description

Direct Blue 290 is a synthetic, high-performance disazo direct dye renowned for its strong affinity to cellulosic fibers. This product is engineered to deliver deep, vibrant blue shades with excellent build-up properties and good overall fastness, making it a critical component for achieving consistent coloration in demanding industrial processes. It is primarily utilized by manufacturers in the textile, paper, and leather industries seeking reliable and cost-effective dyeing solutions for bulk production.

Application

• Textile Dyeing: Primary application for dyeing cotton, viscose, rayon, and other cellulosic fibers in exhaust and continuous dyeing processes.
• Paper Coloring: Used for mass tinting of paper and paperboard to produce uniform blue hues.
• Leather Finishing: Employed in the dyeing of leather goods to achieve deep blue colors.
• Ink Formulation: A colorant component in the manufacture of certain types of inks and toners.
• Biological Staining: Potential use as a histological stain in laboratory settings (specific grades required).

Basic Information

Product Name	Direct Blue 290
CAS No.	110444-91-2
Molecular Formula	C40H23N7Na4O13S4
Molecular Weight	1081.86 g/mol
Synonyms	Direct Blue 290; C.I. 34145; Direct Blue 2B; Direct Blue B; Direct Navy Blue 2B; Amanil Sky Blue 2B; Atul Direct Sky Blue 2B; Dinamine Sky Blue 2B; Pontamine Sky Blue 2B; 2,7-Naphthalenedisulfonic acid, 5-[[4'-[[2,6-diamino-3-[[4-[[4-[(2,4-diaminophenyl)azo]phenyl]amino]-6-sulfo-1-naphthalenyl]azo]phenyl]azo][1,1'-biphenyl]-4-yl]azo]-4-hydroxy-3-[[4-[(4-sulfophenyl)azo]phenyl]azo]-, tetrasodium salt
EINECS	Contact for details

Quality Control

Our Direct Blue 290 is produced under a stringent quality management system. Every batch undergoes comprehensive analytical testing to ensure it meets precise specifications for shade, strength, and solubility. Certificates of Analysis (COA) detailing purity, physical properties, and performance characteristics are provided to guarantee batch-to-batch consistency and compliance with your application requirements.

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	Dark Blue to Bluish-Black Powder
Identification (IR)	Conforms to Standard
Assay (HPLC)	≥ 95%
Moisture Content	≤ 5.0%
Water Solubility	Conforms
Shade	Matches Standard
Strength	100 ± 3%

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