Description

C.I. Reactive Brown 8 is a reactive dye belonging to the azo chemical class, designed to form a covalent bond with cellulosic fibers for excellent wash and light fastness. Its primary value lies in providing a durable, cost-effective brown shade for textile dyeing and printing applications. This product is essential for manufacturers in the textile industry, particularly for dyeing cotton, viscose, and other natural fibers, as well as for research and development in color chemistry.

Application

• Textile Dyeing: Primary application for exhaust and continuous dyeing of cotton, rayon, and other cellulosic fabrics.
• Textile Printing: Used in printing pastes for creating patterned designs on cellulosic textiles.
• Leather Coloring: Imparts color to leather goods where reactive properties are utilized.
• Paper Staining: Employed for coloring paper products requiring good water fastness.
• Biomaterial Staining: Potential use in laboratory settings for staining cellulosic biomaterials.
• Research & Development: Serves as a key intermediate or reference standard in dye chemistry research.

Basic Information

Product Name	C.I. Reactive Brown 8
CAS No.	12225-65-9
Molecular Formula	C31H19ClN7Na4O19S6
Molecular Weight	1131.36 g/mol
Synonyms	Reactive Brown 8; Reactive Brown H-8R; C.I. 18207; Reactive Brown K-B3R; Levafix Brown E-4R; Procion Brown H-8R; Remazol Brown RR; Drimarene Brown K-3R; Vinylsulfone-based Brown Dye; 2,7-Naphthalenedisulfonic acid, 5-[[4-chloro-6-[(3-sulfophenyl)amino]-1,3,5-triazin-2-yl]amino]-4-hydroxy-3-[[2-methoxy-5-[(2-sulfoxyethyl)sulfonyl]phenyl]azo]-, tetrasodium salt
EINECS	Contact for details

Quality Control

Our production of C.I. Reactive Brown 8 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, solubility, fixation rate, and impurity profile. A comprehensive Certificate of Analysis (COA) detailing purity, physical properties, and application performance is provided with each shipment 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 a controlled room temperature (15-25°C). Keep away from strong oxidizing agents and excessive heat. The product is hygroscopic; ensure the container is sealed after each use to prevent moisture absorption, which can affect performance.

Specification

Item	Specification
Appearance	Brown Powder
Identification (IR)	Conforms
Color Strength	100 ± 3% (Standard)
Moisture Content	≤ 5.0%
Water Solubility	≥ 50 g/L (at 50°C)
Fixation Rate	≥ 70% (on cotton)
pH (1% Solution)	6.0 - 8.0
Dusting Property	Low

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