Description

Direct Blue 281 is a synthetic, high-strength disazo direct dye known for its excellent affinity to cellulosic fibers. This product is valued for its deep, vibrant blue shade and good wash and light fastness properties, making it a reliable choice for consistent coloration. It is primarily used by manufacturers in the textile industry for dyeing cotton, viscose, and other regenerated cellulose materials. Our supply ensures consistent quality and batch-to-batch uniformity for industrial-scale production.

Application

• Textile Dyeing: Primary application for exhaust and continuous dyeing of cotton, viscose, rayon, and linen.
• Paper Coloring: Used for tinting and dyeing of paper and paperboard products.
• Leather Finishing: Imparts color to leather goods in the tanning industry.
• Ink Formulation: A colorant component for certain types of industrial inks.
• Dye Blending: Used to create specific navy and black shades when blended with other direct dyes.

Basic Information

Product Name	Direct Blue 281
CAS No.	77907-25-6
Molecular Formula	C40H23N7Na4O13S4
Molecular Weight	1083.85 g/mol
Synonyms	Direct Blue 2B; C.I. Direct Blue 281; Direct Blue 281 (C.I. 24411); Direct Blue 2B 200%; Pontamine Blue 2B; Amanil Blue 2B; Atul Direct Blue 2B; Dinamine Blue 2B; Direct Navy Blue 2B
EINECS	Contact for details

Quality Control

Our Direct Blue 281 is manufactured under a stringent quality management system to ensure it meets the high standards required for industrial dyeing applications. Every batch is tested for key parameters including color strength, shade, solubility, and fastness properties. A Certificate of Analysis (COA) detailing purity, physical properties, and performance characteristics is provided with each shipment to guarantee consistency and reliability for your production 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. 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
Color Strength	Standard Depth ± 3%
Moisture Content	≤ 5.0%
Water Insoluble Matter	≤ 1.0%
Shade	Conforms to Standard
Solubility in Water	Conforms
Fastness to Washing	≥ 3-4 (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.