Description

Reactive Yellow 42 is a high-purity, reactive dye belonging to the azo dye class, identified by CAS No. 12226-63-0. It is valued for its ability to form covalent bonds with cellulosic fibers, resulting in excellent wash and light fastness properties. This product is essential for manufacturers in the textile industry seeking vibrant, durable yellow coloration for cotton, viscose, and other natural fibers.

Application

• Textile Dyeing: Primary application for exhaust and continuous dyeing of cellulosic fibers like cotton, linen, and rayon.
• Textile Printing: Used in printing pastes for creating sharp, bright yellow patterns on fabric.
• Leather Coloring: Imparts durable color to leather goods in tanning processes.
• Paper Dyeing: Employed for coloring paper pulp to achieve consistent, lightfast yellow shades.
• Research & Development: Serves as a standard or intermediate in chemical research and dye synthesis laboratories.
• Industrial Colorant: Potential use in coloring non-textile materials where reactive properties are beneficial.

Basic Information

Product Name	Reactive Yellow 42
CAS No.	12226-63-0
Molecular Formula	C29H19ClN9Na3O19S6
Molecular Weight	1150.31 g/mol
Synonyms	Reactive Yellow 42; C.I. Reactive Yellow 42; Reactive Golden Yellow K-3R; Reactive Brilliant Yellow K-3R; Remazol Golden Yellow 3R; Levafix Golden Yellow E-3R; C.I. 18238; 2,7-Naphthalenedisulfonic acid, 5-[[4-chloro-6-[[3-[[2-(sulfooxy)ethyl]sulfonyl]phenyl]amino]-1,3,5-triazin-2-yl]amino]-4-hydroxy-3-[(2-methoxy-5-methyl-4-sulfophenyl)azo]-, trisodium salt
EINECS	Contact for details

Quality Control

Our Reactive Yellow 42 is manufactured under a strict quality management system. Every batch undergoes rigorous testing to ensure consistent strength, shade, and reactive group content, meeting industry standards for textile applications. A Certificate of Analysis (COA) detailing purity, solubility, and fastness properties is provided with each shipment.

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 and moisture to maintain product stability and performance.

Specification

Item	Specification
Appearance	Yellow to orange powder
Identification (IR)	Conforms to standard
Assay (HPLC)	≥ 90% (as is)
Shade	Conforms to standard pattern
Solubility in Water	≥ 100 g/L (at 50°C)
Moisture Content	≤ 5.0%
pH (1% Solution)	5.0 - 7.0
Fixation Rate	≥ 70% (on cotton)

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