Description

C.I. Reactive Brown 5 is a high-performance, reactive dye belonging to the azo chemical class, designed for covalent bonding with cellulosic fibers. Its primary value lies in delivering excellent wash and light fastness properties, ensuring color durability in demanding textile applications. This product is essential for manufacturers in the textile industry seeking reliable and vibrant brown shades for cotton, viscose, and other cellulose-based fabrics.

Application

• Primary dyeing of cotton fabrics and yarns.
• Coloration of viscose (rayon) and other regenerated cellulose fibers.
• Exhaust dyeing processes in batch operations for textiles.
• Continuous pad-dry-steam or pad-batch dyeing ranges.
• Used in formulations for dyeing cellulosic blends with appropriate dye selections for other fiber components.
• Potential application in the coloration of paper and specialty cellulosic non-wovens.

Basic Information

Product Name	C.I. Reactive Brown 5
CAS No.	12218-01-8
Molecular Formula	C31H19ClN7O10S2·2Na
Molecular Weight	837.74 g/mol (Disodium Salt)
Synonyms	Reactive Brown 5; Reactive Brown KE-3B; C.I. 12218-01-8; Reactive Brown KE3B; Reactive Brown KE-3B (C.I.); Remazol Brown KE-3B; Levafix Brown E-3B; Drimarene Brown K-3B; Procion Brown H-3B
EINECS	Contact for details

Quality Control

Our production of C.I. Reactive Brown 5 adheres to stringent quality management protocols to ensure batch-to-batch consistency and performance reliability. Every lot is tested against key parameters including color strength, shade, solubility, and fixation properties. Certificates of Analysis (COA) detailing purity, physical properties, and application test results are available upon request to support your quality assurance 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 (moisture-sensitive); ensure containers are sealed after each use to prevent moisture absorption.

Specification

Item	Specification
Appearance	Brown Powder
Color Strength	Standard Depth ± 5%
Solubility in Water	≥ 100 g/L (at 50°C)
Moisture Content	≤ 5.0%
pH (1% Solution)	5.0 - 7.0
Fixation Rate	≥ 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.