Description

Reactive Red 31 is a high-performance, water-soluble reactive dye belonging to the azo dye class, widely recognized for its vibrant red color and excellent fastness properties. It is a critical component in the textile industry, valued for its ability to form a covalent bond with cellulose fibers, resulting in brilliant, wash-fast, and lightfast coloration. This product is essential for manufacturers and processors in the textile, leather, and paper industries seeking reliable and consistent dyeing performance for cotton, viscose, and other cellulosic materials.

Application

• Primary application in the exhaust dyeing and continuous dyeing of cellulosic fibers such as cotton, linen, and viscose.
• Used in the printing of textiles to achieve sharp, bright red shades and patterns.
• Suitable for dyeing leather and paper products requiring colorfastness.
• Employed in research and development laboratories for the synthesis of new colorants and material studies.
• Can be used in the coloration of non-woven fabrics and other specialty cellulosic materials.

Basic Information

Product Name	Reactive Red 31
CAS No.	12237-00-2
Molecular Formula	C31H19ClN7Na4O19S6
Molecular Weight	1244.16 g/mol
Synonyms	Reactive Red HE 7B; C.I. Reactive Red 31; Reactive Red HE7B; Remazol Red HE7B; Levafix Red E-7B; Procion Red HE7B; Red HE7B; 2,7-Naphthalenedisulfonic acid, 5-[[4-chloro-6-[[3-[[2-(sulfooxy)ethyl]sulfonyl]phenyl]amino]-1,3,5-triazin-2-yl]amino]-4-hydroxy-3-[[2-methoxy-5-[(methylamino)sulfonyl]phenyl]azo]-, tetrasodium salt
EINECS	Contact for details

Quality Control

Our Reactive Red 31 is manufactured under a stringent quality management system to ensure batch-to-batch consistency and performance reliability. Every lot is tested against key parameters including color strength, solubility, fixation rate, and fastness properties. A comprehensive Certificate of Analysis (COA) detailing purity, physical properties, and performance specifications is provided with each shipment to guarantee it meets the demanding standards of industrial dyeing and printing 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 and incompatible materials. The product is hygroscopic; ensure the container is sealed after each use to prevent moisture absorption.

Specification

Item	Specification
Appearance	Reddish-brown powder
Color Strength	≥ 98% (Standard)
Moisture Content	≤ 5.0%
Water Solubility (at 50°C)	≥ 100 g/L
pH (1% Solution)	5.5 - 7.5
Fixation Rate (on Cotton)	≥ 70%
Identification (IR)	Conforms to standard
Heavy Metals (as Pb)	≤ 50 ppm

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