Description

Reactive Brown 4 CAS NO 12217-09-3 is a high-performance, water-soluble reactive dye belonging to the azo dye class, specifically engineered for covalent bonding with cellulosic fibers. This compound matters for its excellent wash and light fastness properties, providing durable and vibrant brown coloration in demanding textile applications. It is primarily needed by manufacturers in the textile industry for dyeing and printing cotton, viscose, and other natural fibers, as well as for research and development in specialty colorant formulations.

Application

• Exhaust Dyeing of Cotton: For batch dyeing processes of yarns and fabrics, offering deep penetration and level dyeing.
• Continuous Dyeing: Applied in pad-batch and pad-steam processes for efficient, high-volume production of cellulosic textiles.
• Textile Printing: Used in pigment printing pastes for creating sharp, defined brown patterns on fabrics.
• Viscose and Rayon Dyeing: Effective for dyeing regenerated cellulose fibers, providing bright shades.
• Leather Coloring: Employed in the dyeing of leather goods where reactive properties are beneficial.
• Research & Development: Serves as a key intermediate or reference standard in the development of new dye formulations and color studies.
• Paper Pulp Coloring: For tinting specialty papers where colorfastness is required.

Basic Information

Product Name	Reactive Brown 4
CAS No.	12217-09-3
Molecular Formula	C31H19ClN7Na4O19S6
Molecular Weight	1184.37 g/mol
Synonyms	Reactive Brown 4; C.I. Reactive Brown 4; Reactive Brown K-4R; Reactive Brown KE4R; C.I. 12217-09-3; 4-[(4,6-Dichloro-1,3,5-triazin-2-yl)amino]-2-[(E)-2-[4-[(4,6-dichloro-1,3,5-triazin-2-yl)amino]-2-sulfonatophenyl]diazen-1-yl]-5-sulfonatobenzenesulfonate (tetrasodium salt); Tetrasodium 4-[(4,6-dichloro-1,3,5-triazin-2-yl)amino]-2-[(E)-2-[4-[(4,6-dichloro-1,3,5-triazin-2-yl)amino]-2-sulfonatophenyl]diazen-1-yl]-5-sulfonatobenzenesulfonate
EINECS	Contact for details

Quality Control

Our Reactive Brown 4 is produced under strict quality management systems. Every batch undergoes rigorous testing for critical parameters including color strength, shade, solubility, and reactive group content to ensure consistent performance in industrial applications. We provide comprehensive Certificates of Analysis (COA) upon request, detailing purity and specification conformance.

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 container is sealed after each use to prevent moisture absorption.

Specification

Item	Specification
Appearance	Brown to dark brown powder
Identification (IR)	Conforms to structure
Color Strength	≥ 98% (Standard)
Moisture Content	≤ 5.0%
Water Solubility	≥ 100 g/L (at 50°C)
pH (1% Solution)	5.5 - 7.5
Shade	Conforms to standard
Fastness Properties	Wash: 4-5; Light: 5-6 (Typical on Cotton)

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