Description

Reactive Red 4 is a synthetic, water-soluble azo dye belonging to the reactive dye class, widely used for coloring cellulosic fibers. Its primary value lies in its ability to form a covalent bond with the fiber substrate, resulting in excellent wash and light fastness properties. This dye is essential for manufacturers in the textile industry, particularly for dyeing and printing cotton, viscose, and other natural fibers, where vibrant and durable red shades are required.

Application

• Primary dyeing of cotton yarn and fabrics.
• Printing applications on cellulosic textiles.
• Dyeing of viscose (rayon) and linen fibers.
• Used in exhaust dyeing processes for batch production.
• Application in continuous dyeing ranges for high-volume textile manufacturing.
• Can be used in combination with other reactive dyes to achieve a wide spectrum of colors.

Basic Information

Product Name	Reactive Red 4
CAS No.	17681-50-4
Molecular Formula	C26H21ClN7Na3O11S3
Molecular Weight	837.10 g/mol
Synonyms	Reactive Red 4; Reactive Brilliant Red X-3B; C.I. Reactive Red 4; Reactive Red X-3B; Procion Red MX-5B; Levafix Red E-4BA; Remazol Brilliant Red 5B; 2,7-Naphthalenedisulfonic acid, 5-[(4-chloro-6-ethoxy-1,3,5-triazin-2-yl)amino]-4-hydroxy-3-[(2-sulfophenyl)azo]-, trisodium salt
EINECS	241-658-6

Quality Control

Our Reactive Red 4 is manufactured under a strict quality management system to ensure batch-to-batch consistency and performance. Each lot is tested for critical parameters including color strength, shade, solubility, and fixation properties. A Certificate of Analysis (COA) detailing purity, physical properties, and application test results is provided with every shipment to guarantee it meets the stringent requirements of industrial textile processing.

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 incompatible materials. The product is hygroscopic (moisture-sensitive); ensure containers are sealed after use to prevent moisture absorption.

Specification

Item	Specification
Appearance	Reddish-brown powder
Identification (IR)	Conforms to standard
Color Strength	≥ 100% (Standard)
Moisture Content	≤ 5.0%
Water Solubility (at 50°C)	≥ 80 g/L
pH (1% Solution)	6.0 - 8.0
Fixation Rate	≥ 70%
Dusting Grade	Low dusting

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