Description

Direct Blue 15 is a synthetic, water-soluble diazo dye belonging to the direct dye class, known for its strong affinity to cellulose fibers. Its primary value lies in providing a deep, vibrant blue color with excellent wash and light fastness properties on cellulosic materials without the need for a mordant. This dye is essential for manufacturers in the textile industry seeking efficient and cost-effective coloring solutions for cotton, viscose, and paper products. Its consistent performance makes it a reliable choice for industrial dyeing and printing processes.

Application

• Textile Dyeing: Primary application for dyeing cotton, rayon, linen, and other cellulosic fibers in exhaust and continuous dyeing processes.
• Paper Coloring: Used for tinting and coloring paper pulp, providing uniform coloration for specialty papers and boards.
• Leather Finishing: Employed in the dyeing of leather goods to achieve consistent blue shades.
• Ink Formulation: A colorant component in the manufacture of certain types of inks, including stamp pad and flexographic inks.
• Biological Staining: Potential use as a histological stain in laboratory settings for microscopic analysis.

Basic Information

Product Name	Direct Blue 15
CAS No.	2429-74-5
Molecular Formula	C₃₄H₂₄N₆Na₄O₁₆S₄
Molecular Weight	992.80 g/mol
Synonyms	Direct Blue 15; C.I. Direct Blue 15; Direct Blue 2B; Pontamine Blue 2B; Amanil Sky Blue 2B; Chlorazol Sky Blue FF; Diazol Sky Blue 2B; Sky Blue 2B; C.I. 24400; Tetrasodium 3,3'-[[1,1'-biphenyl]-4,4'-diylbis(azo)]bis[5-amino-4-hydroxynaphthalene-2,7-disulphonate]
EINECS	219-388-9

Quality Control

Our production of Direct Blue 15 adheres to stringent quality management protocols to ensure batch-to-batch consistency and performance reliability. Every lot is analyzed against key specifications for color strength, shade, solubility, and impurity profile. A comprehensive Certificate of Analysis (COA) detailing purity, physical properties, and conformance is provided with each shipment, supporting your quality assurance and regulatory compliance needs.

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 incompatible materials and sources of heat. The product is light-sensitive and should be stored away from direct light exposure to maintain stability.

Specification

Item	Specification
Appearance	Dark Blue to Bluish-Black Powder
Identification (IR)	Conforms to Standard
Color Strength	100 ± 3% (vs. Standard)
Moisture Content	≤ 5.0%
Water Insoluble Matter	≤ 0.5%
Shade	Conforms to Standard
Solubility in Water	Completely Soluble (Clear Solution)

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