Description

Reactive Red 221 is a high-performance, water-soluble azo-based reactive dye designed for covalent bonding with cellulosic fibers. Its primary value lies in delivering brilliant, durable red shades with excellent wash and light fastness properties, ensuring long-lasting color integrity in finished textiles. This dye is essential for manufacturers in the textile industry seeking reliable and vibrant coloration for cotton, viscose, and other cellulose-based materials.

Application

• Exhaust Dyeing of Cotton: Primary application for dyeing cotton yarns and fabrics in batch processes, offering high fixation and yield.
• Continuous Dyeing (Pad-Batch/Steam): Used in continuous dyeing ranges for efficient, large-scale production of cellulosic textiles.
• Viscose and Rayon Coloration: Effective for dyeing regenerated cellulose fibers like viscose and rayon, providing uniform and bright shades.
• Textile Printing: Suitable for printing applications on cellulose fabrics, creating sharp and colorfast printed designs.
• Blend Dyeing (Cotton/Polyester): Can be used in combination with disperse dyes for dyeing cotton/polyester blend fabrics.
• Leather Dyeing: Applied in the coloration of certain types of leather where reactive dyes are specified.

Basic Information

Product Name	Reactive Red 221
CAS No.	96726-27-1
Molecular Formula	C31H19ClN7Na5O19S6
Molecular Weight	Contact for details
Synonyms	Reactive Red HE-3B; C.I. Reactive Red 221; Reactive Red HE3B; Red HE3B; Levafix Red CA; Remazol Red CA; Dianix Red CA; Procion Red HE-3B; Sumifix Red HE-3B
EINECS	Contact for details

Quality Control

Our Reactive Red 221 is manufactured under a stringent quality management system to ensure batch-to-batch consistency and performance. Each lot is tested against key parameters including color strength, shade, solubility, and fixation properties. A Certificate of Analysis (COA) detailing purity, physical properties, and application performance is provided with every shipment to guarantee it meets the specifications required for industrial dyeing processes.

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. The product is hygroscopic (moisture-sensitive); ensure the original packaging is resealed tightly after use to prevent moisture absorption and caking.

Specification

Item	Specification
Appearance	Reddish-brown powder
Color Strength	Standard Depth ± 3%
Solubility in Water (50°C)	≥ 100 g/L
pH (1% Solution)	6.0 - 8.0
Moisture Content	≤ 5.0%
Dusting Property	Low
Fixation Rate	≥ 70%
Fastness Properties (Typical)	Wash: 4-5, Light: 5-6

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