Description

C.I. Reactive Brown 19 is a high-performance, water-soluble reactive dye designed for permanent coloration of cellulosic fibers. Its primary value lies in providing excellent wash and light fastness properties, ensuring vibrant and durable brown shades. This product is essential for textile manufacturers and dye houses specializing in cotton, viscose, and other natural fiber dyeing and printing processes. It is also suitable for applications requiring a specific brown hue in leather and paper production.

Application

• Exhaust Dyeing of Cotton: For batch dyeing processes of yarns, knits, and woven fabrics.
• Continuous Dyeing: Applied in pad-batch, pad-steam, and pad-dry thermofix processes for efficient large-scale production.
• Textile Printing: Used in pigment printing formulations for sharp and consistent brown patterns on cellulosic substrates.
• Viscose and Rayon Dyeing: Provides uniform and deep penetration for regenerated cellulose fibers.
• Leather Coloring: Imparts rich brown tones to finished leather goods.
• Paper Staining: For specialty papers requiring colored stock or surface coating.

Basic Information

Product Name	C.I. Reactive Brown 19
CAS No.	75627-27-9
Molecular Formula	C31H19Cl2N15Na6O19S6
Molecular Weight	1331.86 g/mol
Synonyms	Reactive Brown 19; Reactive Brown K-4R; C.I. 182025; Reactive Brown KE4R; Reactive Brown M-4R; Dinazol Brown 4R; Triactive Brown C-4R; Brown 19 Reactive Dye
EINECS	Contact for details

Quality Control

Our C.I. Reactive Brown 19 is manufactured under a stringent quality management system. Every batch is tested against rigorous internal specifications to ensure consistent shade, strength, solubility, and fixation properties. A comprehensive Certificate of Analysis (COA) detailing purity, physical parameters, and performance characteristics is provided with each shipment to guarantee it meets the demands of industrial dyeing 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). This material is hygroscopic (moisture-sensitive) and light-sensitive; containers must be kept tightly sealed when not in use to prevent absorption of atmospheric moisture and degradation.

Specification

Item	Specification
Appearance	Brown Powder
Color Strength	100 ± 3% (vs. Standard)
Solubility (in Water)	≥ 100 g/L (at 50°C)
Moisture Content	≤ 5.0%
pH (1% Solution)	5.0 - 7.0
Fixation Rate	≥ 70%
Shade	Conforms to Standard

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