Description

Reactive Brown 37 is a high-performance, water-soluble reactive dye designed for covalent bonding with cellulosic fibers. This compound is valued for its excellent wash and light fastness properties, providing durable and vibrant brown colorations. It is primarily used by textile manufacturers and dye houses for dyeing and printing applications on cotton, viscose, and other natural fibers.

Application

• Exhaust dyeing of cotton and viscose yarns and fabrics.
• Continuous pad-dyeing processes for cellulosic textiles.
• Textile printing applications, offering sharp print definition.
• Used in combination with other reactive dyes to achieve a wide spectrum of brown and olive shades.
• Dyeing of hemp and linen for home furnishing and apparel.
• Potential application in the coloration of paper and leather where reactive chemistry is applicable.

Basic Information

Product Name	Reactive Brown 37
CAS No.	122391-00-8
Molecular Formula	C31H19Cl3N10Na4O16S4
Molecular Weight	1193.86 g/mol
Synonyms	Reactive Brown 37; C.I. Reactive Brown 37; Reactive Brown K-4R; Reactive Brown KE4R; Reactive Brown KE-4R; C.I. 205495; 2,7-Naphthalenedisulfonic acid, 5-[[4-chloro-6-[[3-[[4-[[2-(sulfooxy)ethyl]sulfonyl]phenyl]azo]-4-sulfophenyl]amino]-1,3,5-triazin-2-yl]amino]-4-hydroxy-3-[[2-methoxy-5-[[2-(sulfooxy)ethyl]sulfonyl]phenyl]azo]-, tetrasodium salt
EINECS	Contact for details

Quality Control

Our Reactive Brown 37 is manufactured under a stringent quality management system. Every batch is tested to ensure consistent shade, strength, and fixation properties. Key parameters such as color strength, solubility, and fixation rate are verified against established standards. A Certificate of Analysis (COA) detailing purity, physical properties, and performance metrics is provided with each shipment to guarantee reliable and reproducible results in your dyeing process.

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. The product is hygroscopic (moisture-sensitive); ensure the container is sealed after each use to prevent moisture absorption and caking.

Specification

Item	Specification
Appearance	Brown powder
Color Strength	≥ 98% (vs. Standard)
Moisture Content	≤ 7.0%
Water Insoluble Matter	≤ 1.0%
Dye Content	≥ 70.0%
Fixation Rate	≥ 70% (on cotton)
Solubility (50°C)	≥ 100 g/L
pH (1% Solution)	5.5 - 7.5
Identification (IR)	Conforms

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