Description

Reactive Blue 221 is a high-performance, reactive dye belonging to the anthraquinone class, valued for its brilliant blue shade and excellent fastness properties. It is a critical component for achieving durable and vibrant coloration on cellulosic fibers like cotton and viscose. This product is essential for textile manufacturers, dye houses, and chemical distributors serving the global fabric production industry. Its consistent quality ensures reliable batch-to-batch performance in demanding dyeing processes.

Application

• Exhaust Dyeing of Cotton: Primary application for dyeing yarns, knits, and woven fabrics in jet, overflow, and beam dyeing machines.
• Continuous Dyeing of Cellulosics: Used in pad-batch and pad-steam processes for efficient, large-scale fabric production.
• Viscose and Lyocell Dyeing: Provides excellent build-up and color yield on regenerated cellulosic fibers.
• Shade Formulation: A key component in creating a wide range of navy, royal blue, and black shades, often in combination with other reactive dyes.
• Textile Printing: Employed in reactive printing pastes for sharp, wash-fast prints on cellulose-based fabrics.
• Industrial Textiles: Suitable for dyeing workwear, home textiles, and other fabrics requiring high colorfastness to washing and light.

Basic Information

Product Name	Reactive Blue 221
CAS No.	89933-65-3
Molecular Formula	C29H19ClN7O11S3·xNa
Molecular Weight	Approx. 840.2 (Free Acid)
Synonyms	Reactive Blue 221; C.I. Reactive Blue 221; Remazol Brilliant Blue R Special; Levafix Blue CA; Procion Blue H-ERD; Sumifix Supra Brilliant Blue BRF; Dianix Blue CC-R; Bezaktiv Blue V-D
EINECS	Contact for details

Quality Control

Our Reactive Blue 221 is manufactured under a stringent quality management system to ensure it meets the high standards required for industrial textile dyeing. Every batch is tested for critical parameters including color strength, solubility, fixation rate, and fastness properties. A comprehensive Certificate of Analysis (COA) detailing purity, shade, and physical-chemical specifications is provided with each shipment to guarantee consistency and performance.

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 heat, sparks, and open flame. The product is light-sensitive and should be stored away from direct light exposure to maintain stability.

Specification

Item	Specification
Appearance	Blue Powder
Color Strength	100 ± 3% (Standard)
Moisture Content	≤ 5.0%
Water Solubility	≥ 100 g/L (at 50°C)
pH (1% Solution)	5.5 - 7.5
Fixation Rate	≥ 70%
Fastness to Washing	4-5 (ISO 105-C03)
Fastness to Light	5-6 (ISO 105-B02)

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