Description

Reactive Brown 45 is a high-performance, water-soluble reactive dye belonging to the azo dye class, identified by CAS No. 148262-90-2. It is engineered for covalent bonding with cellulosic fibers, offering excellent wash and light fastness properties for durable coloration. This product is essential for textile manufacturers and dye houses seeking reliable, vibrant brown shades with high fixation rates and minimal environmental impact during application.

Application

Reactive Brown 45 is primarily used in the textile industry for dyeing and printing natural fibers. Its key applications include:

• Exhaust Dyeing of Cotton: For batch-wise dyeing of yarns, knits, and woven fabrics.
• Continuous Dyeing Processes: Applied in pad-batch and pad-steam methods for efficient, large-scale fabric production.
• Textile Printing: Used in pigment printing formulations for sharp, defined patterns on cellulose-based materials.
• Dyeing of Regenerated Cellulose: Suitable for fibers such as viscose, lyocell, and modal.
• Blend Fabric Dyeing: Often used in combination with other dyes for coloring cotton-polyester blends.
• Craft and Specialty Fabric Coloration: For small-scale artisan or custom textile projects requiring specific brown hues.

Basic Information

Product Name	Reactive Brown 45
CAS No.	148262-90-2
Molecular Formula	C31H19ClN7Na4O19S6
Molecular Weight	1180.36 g/mol (as sodium salt)
Synonyms	Reactive Brown K-4R; C.I. Reactive Brown 45; Reactive Brown K4R; Brown K-4R; 2,7-Naphthalenedisulfonic acid, 5-[[4-chloro-6-[[3-[[4-[[4,6-dichloro-1,3,5-triazin-2-yl]amino]-2-sulfophenyl]azo]-4-sulfophenyl]amino]-1,3,5-triazin-2-yl]amino]-4-hydroxy-3-[[2-sulfo-4-[(4-sulfophenyl)azo]phenyl]azo]-, sodium salt; Reactive Brown KE4R; C.I. 18205; APOLLO Reactive Brown K-4R
EINECS	Contact for details

Quality Control

Our production of Reactive Brown 45 adheres to stringent quality management systems to ensure batch-to-batch consistency and performance. Every lot is tested against key parameters including color strength, shade, solubility, and fixation rate. Certificates of Analysis (COA) detailing purity, physical properties, and application performance are available upon request to support your quality assurance protocols.

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 incompatible materials. The product is hygroscopic (moisture-sensitive); ensure containers are sealed after each use to prevent moisture absorption and caking.

Specification

Item	Specification
Appearance	Brown to dark brown powder
Identification (IR)	Conforms to standard
Color Strength	100 ± 3% (Standard)
Moisture Content	≤ 5.0%
Water Solubility (at 50°C)	≥ 100 g/L
pH (1% Solution)	6.0 - 8.0
Dusting Grade	Low-dusting
Fixation Rate	≥ 70% (Standard conditions)

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