Description

Reactive Red 181 is a high-performance, water-soluble azo dye belonging to the reactive dye class, designed for covalent bonding with cellulosic fibers. Its primary value lies in delivering brilliant, wash-fast red shades with excellent reproducibility and cost-effectiveness in industrial dyeing processes. This product is essential for textile manufacturers, leather tanners, and paper producers seeking vibrant, durable coloration. Reactive Red 181 CAS NO 66331-25-7 is a key component for achieving a wide spectrum of hues in combination with other reactive dyes.

Application

• Textile Dyeing: Primary application for dyeing cotton, viscose, linen, and other cellulosic fabrics in exhaust, pad-batch, and continuous dyeing processes.
• Leather Coloring: Used for dyeing leather goods, providing rich color with good penetration and fastness properties.
• Paper Staining: Employed in the production of colored papers, tissues, and specialty packaging materials.
• Ink Formulation: A colorant component in the manufacture of inks for various printing applications.
• Research & Development: Serves as a standard or intermediate in chemical research and quality control laboratories.

Basic Information

Product Name	Reactive Red 181
CAS No.	66331-25-7
Molecular Formula	C31H19ClN7Na4O19S6
Molecular Weight	1135.36 g/mol
Synonyms	Reactive Red HE-3B; C.I. Reactive Red 181; Remazol Red 3BS; Levafix Red CA; Procion Red H-E3B; Dinazol Red 3BS; Reactive Red M-3BE; Adiactive Red H-E3B
EINECS	Contact for details

Quality Control

Our Reactive Red 181 is manufactured under a stringent quality management system. Every batch is tested to ensure consistent strength, shade, and application performance, meeting the high standards required by the global textile industry. Certificates of Analysis (COA) detailing purity, strength, and impurity profiles are available upon request.

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; ensure the container is sealed after each 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 Insoluble Matter	≤ 0.5%
pH (1% Solution)	6.0 - 8.0
Shade	Conforms to standard
Fastness Properties	To commercial standard

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