Description

Reactive Yellow 38 is a high-performance, water-soluble reactive dye belonging to the azo dye class, identified by CAS No. 12237-17-1. It is engineered to form a covalent bond with cellulose fibers, delivering excellent wash and light fastness properties. This product is essential for textile manufacturers and dye houses seeking vibrant, durable yellow shades on cotton, viscose, and other cellulosic materials.

Application

• Primary dyeing and printing of cellulosic fibers such as cotton, linen, and rayon.
• Exhaust dyeing processes for yarn, knitwear, and woven fabrics requiring high color yield.
• Continuous dyeing operations, including pad-batch and pad-steam methods.
• Production of vibrant yellow hues in home textiles like bed linens, curtains, and upholstery.
• Used in the coloration of blended fabrics where the cellulosic component is targeted.
• Manufacturing of dyed materials for workwear and uniforms where colorfastness is critical.

Basic Information

Product Name	Reactive Yellow 38
CAS No.	12237-17-1
Molecular Formula	C29H19ClN7Na3O11S3
Molecular Weight	872.09 g/mol
Synonyms	Reactive Yellow H-E4R; C.I. Reactive Yellow 38; Reactive Yellow HE4R; Yellow H-E4R; 2,7-Naphthalenedisulfonic acid, 5-[[4-chloro-6-[(3-sulfophenyl)amino]-1,3,5-triazin-2-yl]amino]-4-hydroxy-3-[[2-methoxy-5-[(2-sulfophenyl)azo]phenyl]azo]-, trisodium salt; Reactive Golden Yellow H-E4R; Triazinyl yellow dye
EINECS	Contact for details

Quality Control

Our Reactive Yellow 38 is manufactured 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 applications. A comprehensive 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 integrity and shelf life.

Specification

Item	Specification
Appearance	Yellow to brown powder
Identification (IR)	Conforms to standard
Assay (HPLC)	Min. 95%
Moisture Content	Max. 5.0%
Water Solubility	Conforms
Shade	Conforms to standard pattern
Fastness Properties (Wash, Light)	Grade 4-5 (ISO Standards)

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