Description

Reactive Blue 221 is a high-performance, fiber-reactive dye belonging to the anthraquinone class, known for its brilliant blue shade and excellent fastness properties. Its primary value lies in providing vibrant, wash-fast, and light-fast coloration for cellulosic fibers like cotton and viscose, making it a cornerstone for demanding textile applications. This product is essential for textile manufacturers, dye houses, and chemical distributors serving the global apparel, home furnishing, and technical textile industries seeking reliable and consistent colorants.

Application

• Exhaust Dyeing of Cotton: Primary application for dyeing yarns, knits, and woven fabrics in jet, overflow, and beam dyeing machines.
• Continuous Pad-Dyeing: Used in pad-batch and pad-steam processes for efficient, large-scale coloration of cotton fabrics.
• Viscose/Rayon Dyeing: Effective for dyeing regenerated cellulosic fibers, providing bright shades with good exhaustion.
• Blend Dyeing (Cotton/Polyester): Can be used in one-bath or two-bath processes for polyester/cellulose blends when combined with appropriate disperse dyes.
• Garment Dyeing: Suitable for dyeing finished cotton garments, offering flexibility for fashion and small-batch production.
• Home Textiles: Ideal for dyeing towels, bed linens, and other home furnishing fabrics where colorfastness to washing and light is critical.

Basic Information

Product Name	Reactive Blue 221
CAS No.	93051-41-3
Molecular Formula	C29H19ClN7O11S3·xNa
Molecular Weight	Approx. 812.1 (Free Acid)
Synonyms	C.I. Reactive Blue 221; Reactive Blue KN-R; Remazol Brilliant Blue R Spec; Levafix Blue CA; Procion Blue H-ERD; Sumifix Supra Brilliant Blue BRF; Dinazol Brilliant Blue R; Anthraquinone Blue Reactive Dye
EINECS	Contact for details

Quality Control

Every batch of Reactive Blue 221 is manufactured under a strict quality management system and undergoes comprehensive analytical testing to ensure batch-to-batch consistency and performance. Our products are tested against key parameters including shade, strength, solubility, and fixation properties. A Certificate of Analysis (COA) detailing purity, physical properties, and application test results is provided with each shipment to guarantee it meets your specific technical requirements.

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 strong oxidizing agents and excessive heat. Under recommended conditions, the product has excellent shelf stability.

Specification

Item	Specification
Appearance	Blue Powder
Color Strength	100 ± 3% (vs. Standard)
Moisture Content	≤ 7.0%
Water Solubility	≥ 100 g/L (at 50°C)
pH (1% Solution)	5.5 - 7.5
Fixation Rate	≥ 70% (Standard Cotton)
Dusting Grade	Low Dusting

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