Description

C.I. Direct Blue 225 is a synthetic, water-soluble direct dye belonging to the azo chemical class, identified by CAS NO 61724-75-2. It is valued for its strong affinity to cellulosic fibers, providing excellent wash and light fastness properties for deep, vibrant blue shades. This dye is essential for manufacturers in the textile industry seeking reliable and efficient coloring solutions for cotton, viscose, and other natural fibers.

Application

• Textile Dyeing: Primary application for exhaust and continuous dyeing of cotton, rayon, linen, and other cellulosic fabrics.
• Paper Coloring: Used in the production of colored papers, tissues, and paperboard where deep blue hues are required.
• Leather Finishing: Imparts color to leather goods, offering good penetration and uniformity on tanned hides.
• Ink Formulation: A component in the manufacture of certain types of inks, including those for flexographic and inkjet applications.
• Biological Staining: Potential use as a histological stain in laboratory settings for microscopic analysis.
• Craft and Specialty Dyes: Suitable for use in batik, tie-dye, and other craft applications on natural fiber materials.

Basic Information

Product Name	C.I. Direct Blue 225
CAS No.	61724-75-2
Molecular Formula	C32H20N6Na4O16S4
Molecular Weight	992.78 g/mol
Synonyms	Direct Blue 225; C.I. 34145; Direct Blue 2B; Direct Blue B2RL; Amanil Sky Blue 2B; Atul Direct Sky Blue 2B; Dinamine Sky Blue 2B; Sirius Supra Blue 2B; Solar Sky Blue 2B; Solophenyl Blue 2B
EINECS	Contact for details

Quality Control

Our C.I. Direct Blue 225 is manufactured under a stringent quality management system to ensure batch-to-batch consistency and performance. Quality is verified through comprehensive testing including spectrophotometric analysis for shade and strength, and assessment of key parameters such as solubility and fastness properties. A Certificate of Analysis (COA) detailing purity, physical properties, and performance characteristics is provided with every shipment.

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. Due to its light-sensitive nature, prolonged exposure to direct light should be avoided to maintain product integrity.

Specification

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

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