Description

Reactive Brown 18 is a high-performance, water-soluble reactive dye designed for covalent bonding with cellulosic fibers. Its primary value lies in delivering excellent wash and light fastness properties, ensuring color durability in demanding applications. This product is essential for textile manufacturers and dye houses specializing in cotton, viscose, and other cellulose-based materials, where consistent shade and reliable performance are critical.

Application

• Exhaust Dyeing of Cellulosic Fibers: Primary application for dyeing cotton, rayon, and linen yarns and fabrics in batch processes.
• Continuous Dyeing Processes: Suitable for pad-batch and pad-steam operations for uniform coloration of woven and knitted fabrics.
• Textile Printing: Used in printing pastes for creating durable brown shades and hues on cellulose textiles.
• Leather Coloring: Application in dyeing leather goods where good penetration and fastness are required.
• Paper Pulp Coloring: For tinting paper products where color fastness is a consideration.

Basic Information

Product Name	Reactive Brown 18
CAS No.	12225-73-9
Molecular Formula	C31H19Cl2N9O13S3·3Na
Molecular Weight	984.64 g/mol (as trisodium salt)
Synonyms	Reactive Brown 18; C.I. Reactive Brown 18; C.I. 12225-73-9; Reactive Brown K-4R; Reactive Brown KE4R; Levafix Brown E-4R; Remazol Brown RR; Drimarene Brown K-4R
EINECS	Contact for details

Quality Control

Our Reactive Brown 18 is manufactured under a stringent quality management system. Each batch is tested to ensure consistent strength, shade, and reactivity, meeting the high standards required for industrial textile applications. A comprehensive Certificate of Analysis (COA) detailing purity, dye content, solubility, and fastness properties is provided with every shipment.

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 excessive heat. The product is hygroscopic; ensure the container is resealed tightly after use to prevent moisture absorption.

Specification

Item	Specification
Appearance	Brown powder
Identification (IR)	Conforms to standard
Dye Content	≥ 80%
Shade	Conforms to standard
Solubility in Water	≥ 100 g/L (at 50°C)
pH (1% Solution)	6.0 - 8.0
Moisture Content	≤ 5.0%
Fastness to Washing	≥ 4-5 (ISO 105-C03)
Fastness to Light	≥ 5 (ISO 105-B02)

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