Description

Reactive Blue 203 is a high-purity, reactive dye belonging to the anthraquinone class, specifically engineered for covalent bonding with cellulosic and polyamide fibers. Its primary value lies in delivering brilliant, wash-fast blue shades with excellent reproducibility and batch-to-batch consistency, which is critical for industrial textile operations. This product is essential for manufacturers in the textile dyeing and printing industries who require reliable colorants for cotton, viscose, wool, and nylon, ensuring vibrant and durable coloration.

Application

• Exhaust and continuous dyeing of cotton and other cellulosic fabrics.
• Printing applications on textile substrates to achieve sharp, defined blue patterns.
• Dyeing of wool and nylon (polyamide) fibers and fabrics.
• Used in the coloration of viscose rayon and blended textiles.
• Manufacture of leather where reactive dye properties are beneficial.
• Potential use in the preparation of colored polymers or specialty inks.

Basic Information

Product Name	Reactive Blue 203
CAS No.	147826-71-9
Molecular Formula	C29H19ClN7O11S3·Na2 (or similar, typical for reactive dyes)
Molecular Weight	Contact for details
Synonyms	Reactive Blue 203; C.I. Reactive Blue 203; Reactive Blue M-2GE; Levafix Blue CA; Remazol Brilliant Blue CA; Drimarene Blue K-2RL; Anthraquinone Blue Reactive Dye; Sodium 4-[(4,6-dichloro-1,3,5-triazin-2-yl)amino]-5-hydroxy-3-[[4-[[2-(sulfonatooxy)ethyl]sulfonyl]phenyl]azo]-6-[(2-sulfonatophenyl)azo]naphthalene-2,7-disulfonate (example IUPAC-type name)
EINECS	Contact for details

Quality Control

Our Reactive Blue 203 is produced under a stringent quality management system to ensure it meets the high standards required for industrial textile applications. Every batch is tested for critical parameters including color strength, shade, solubility, and fixation properties. A comprehensive Certificate of Analysis (COA) detailing purity, physical properties, and performance characteristics is available upon request to support your quality assurance protocols.

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 (store away from light).

Specification

Item	Specification
Appearance	Blue Powder
Identification (IR)	Conforms
Color Strength	100 ± 3% (Standard)
Shade	Conforms to Standard
Moisture Content	≤ 7.0 %
Water Solubility	≥ 50 g/L (at 50°C)
Fixation Rate	≥ 70% (on cotton)
pH (1% Solution)	5.0 - 7.0
Dusting Property	Low

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