Description

Reactive Yellow 37 (CAS No. 12237-16-0) is a high-performance, water-soluble reactive dye belonging to the azo chemical class. It is engineered for exceptional color fastness and brilliant yellow hues in demanding textile applications. This product is essential for manufacturers in the textile industry seeking reliable and vibrant coloration for cellulosic fibers like cotton and viscose.

Application

Reactive Yellow 37 is primarily used in the dyeing and printing of textiles, offering excellent wash and light fastness. Its key applications include:

• Exhaust Dyeing of Cellulosic Fibers: For dyeing cotton, linen, hemp, and rayon in batch processes.
• Continuous Dyeing Processes: Used in pad-batch and pad-steam operations for uniform coloration.
• Textile Printing: Formulated into printing pastes for creating sharp, defined patterns on fabrics.
• Garment Dyeing: Suitable for dyeing finished apparel items to achieve consistent color.
• Yarn Dyeing: For coloring cotton or blended yarns prior to weaving or knitting.
• Technical Textiles: Used in coloring textiles where durability is a priority.

Basic Information

Product Name	Reactive Yellow 37
CAS No.	12237-16-0
Molecular Formula	C29H19ClN7Na4O19S6
Molecular Weight	~1187.3 g/mol
Synonyms	Reactive Yellow 37; C.I. Reactive Yellow 37; Reactive Golden Yellow K-3R; Reactive Brilliant Yellow K-3R; Remazol Golden Yellow 3R; Levafix Golden Yellow E-3R; Procion Yellow H-3R; Dianix Yellow 3R; 2,7-Naphthalenedisulfonic acid, 5-[[4-chloro-6-[(3-sulfophenyl)amino]-1,3,5-triazin-2-yl]amino]-4-hydroxy-3-[(2-sulfophenyl)azo]-, tetrasodium salt
EINECS	Contact for details

Quality Control

Our Reactive Yellow 37 is produced under a stringent quality management system. Every batch is tested to ensure consistent strength, shade, and reactivity, meeting the high standards required for industrial textile dyeing. Certificates of Analysis (COA) detailing purity, solubility, and colorimetric data are available upon request.

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	Yellow to reddish-yellow powder
Identification (IR)	Conforms to standard
Color Strength	100 ± 3% (Standard)
Solubility in Water	≥ 100 g/L (at 50°C)
Moisture Content	≤ 5.0%
pH (1% Solution)	6.0 - 8.0
Fixation Rate	≥ 70%
Dusting Property	Low

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