Description

C.I.Direct Blue 30 is a substantive azo dye belonging to the class of direct dyes, identified by CAS NO 6656-08-2. It is valued for its strong affinity to cellulosic fibers like cotton, rayon, and paper, providing deep, wash-fast blue colorations without the need for a mordant. This product is essential for manufacturers in the textile, paper, and leather industries seeking efficient and cost-effective dyeing solutions for bulk applications.

Application

• Textile Dyeing: Primary application for dyeing cotton, viscose rayon, and other cellulosic fabrics to achieve navy to blackish-blue shades.
• Paper Coloring: Used in the mass coloration of paper products, including packaging materials and specialty papers.
• Leather Finishing: Imparts color to leather goods in the tanning industry.
• Ink Formulation: A colorant component in the manufacture of certain inks and toners.
• Biological Staining: Potential use as a histological stain in laboratory settings.

Basic Information

Product Name	C.I. Direct Blue 30
CAS No.	6656-08-2
Molecular Formula	C34H24N6Na4O16S4
Molecular Weight	992.81 g/mol
Synonyms	Direct Blue 30; C.I. 34240; Direct Navy Blue 2B; Direct Blue 2B; Pontamine Blue 2B; Amanil Navy Blue 2B; Chloramine Blue 2B; Diazol Navy Blue 2B; Sirius Navy Blue 2B; 3,3'-((3,3'-Dimethoxy-(1,1'-biphenyl)-4,4'-diyl)bis(azo))bis(5-amino-4-hydroxynaphthalene-2,7-disulfonic acid) tetrasodium salt
EINECS	229-671-4

Quality Control

Our C.I. Direct Blue 30 is manufactured under a stringent quality management system. Every batch undergoes rigorous testing for key parameters including color strength, shade, solubility, and impurity profile to ensure consistency and performance. Certificates of Analysis (COA) documenting purity, physical properties, and conformance to standard specifications are available upon request.

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 Black Powder
Identification (IR)	Conforms to Standard
Color Strength	100 ± 3% (Standard)
Moisture Content	≤ 5.0%
Water Solubility	Conforms
Ash Content	≤ 1.0%
pH (1% Solution)	6.0 - 8.0

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