Description

Reactive Blue 204 is a high-performance, vinyl sulfone-based reactive dye designed for covalent bonding with cellulosic fibers. This product is essential for achieving brilliant, wash-fast blue shades in textile coloration processes. It is primarily needed by textile manufacturers and dye houses specializing in cotton, viscose, and other cellulose-based fabrics, where consistent color yield and fastness properties are critical for quality assurance.

Application

• Exhaust Dyeing of Cotton: For batchwise dyeing processes in jiggers, winches, and jet machines, offering excellent levelness and reproducibility.
• Continuous Dyeing of Cellulosics: Applied in pad-batch, pad-steam, and pad-dry thermofix processes for high-volume production.
• Viscose and Rayon Coloration: Provides deep and even shades on regenerated cellulose fibers with high fixation efficiency.
• Textile Printing: Used in printing pastes for creating sharp, durable blue designs and patterns on cellulose fabrics.
• Blend Fabric Dyeing: Suitable for dyeing cotton/polyester or other cellulose-containing blend fabrics in combination with appropriate disperse dyes.
• Industrial Fabric Coloration: For applications requiring colorfastness, such as in workwear, home textiles, and automotive textiles.

Basic Information

Product Name	Reactive Blue 204
CAS No.	107028-81-9
Molecular Formula	C29H19ClN7Na4O19S6
Molecular Weight	1136.28 g/mol
Synonyms	Reactive Blue VS-R; C.I. Reactive Blue 204; Remazol Brilliant Blue R Special; Vinylsulfone Reactive Blue 204; Levafix Blue CA; Drimarene Blue R-BL; Sumifix Brilliant Blue RBS; Kayacion Blue E-R
EINECS	Contact for details

Quality Control

Our Reactive Blue 204 is manufactured under a stringent quality management system to ensure batch-to-batch consistency and performance reliability. Every lot is tested for key parameters including color strength, solubility, fixation rate, and fastness properties. A comprehensive Certificate of Analysis (COA) detailing purity, physical properties, and application test results is provided with each shipment 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 ambient temperature (15-25°C). Keep away from strong oxidizing agents and excessive heat. Under these conditions, the product has excellent shelf stability.

Specification

Item	Specification
Appearance	Blue powder
Color Strength	100 ± 3% (Standard)
Moisture Content	≤ 7.0%
Water Solubility (at 50°C)	≥ 100 g/L
pH (1% Solution)	6.0 - 8.0
Dusting Property	Low
Fixation Rate (on Cotton)	≥ 70%
Identification (IR)	Conforms to standard

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