Description

Direct Blue 279 is a high-performance, synthetic direct dye belonging to the azo chemical class, valued for its strong affinity to cellulosic fibers. This product is engineered to deliver excellent wash and light fastness properties, ensuring color durability in demanding applications. It is primarily utilized by manufacturers in the textile, paper, and leather industries for dyeing and printing processes where deep, consistent blue shades are required.

Application

• Textile Dyeing: Primary application for dyeing cotton, viscose, rayon, and other cellulosic fibers to achieve navy to blackish-blue shades.
• Paper Coloring: Used in the production of colored papers, including specialty packaging and decorative papers.
• Leather Finishing: Imparts color to leather goods in the tanning industry.
• Ink Formulation: A pigment source in the manufacture of inks for various printing applications.
• Biological Staining: Potential use as a histological stain in laboratory settings (specific grades required).

Basic Information

Product Name	Direct Blue 279
CAS No.	72827-89-5
Molecular Formula	C40H23N7Na4O13S4
Molecular Weight	1081.87 g/mol
Synonyms	Direct Blue 279; C.I. Direct Blue 279; Direct Navy Blue 279; Pontamine Blue 279; Sirius Blue 279; Aizen Direct Blue 279; Amanil Blue 279; Atul Direct Blue 279
EINECS	Contact for details

Quality Control

Our Direct Blue 279 is manufactured under a strict quality management system. Every batch undergoes comprehensive analytical testing to ensure it meets precise color strength, shade, and chemical purity specifications. A Certificate of Analysis (COA) detailing parameters such as assay, solubility, and fastness properties is provided with each shipment to guarantee consistency and performance for your industrial processes.

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 moisture to maintain product integrity.

Specification

Item	Specification
Appearance	Dark Blue to Black Powder
Identification (IR)	Conforms to Standard
Color Strength	100 ± 3% (vs. Standard)
Shade	Conforms to Standard
Moisture Content	≤ 5.0%
Water Insoluble Matter	≤ 1.0%
pH (1% Solution)	6.0 - 8.0
Fastness to Washing	≥ 4-5 (ISO 105-C03)
Fastness to Light	≥ 5 (ISO 105-B02)

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