Description

C.I. Reactive Yellow 51 is a high-performance, water-soluble reactive dye belonging to the vinyl sulfone class, known for its bright and vibrant yellow hue. It is engineered to deliver excellent color yield, wash fastness, and reproducibility in demanding industrial dyeing processes. This product is essential for manufacturers in the textile and leather industries seeking reliable and consistent coloration for cellulosic fibers like cotton and viscose.

Application

C.I. Reactive Yellow 51 is primarily used in exhaust and continuous dyeing processes. Its key applications include:

• Textile Dyeing: Primary application for dyeing cotton, viscose, linen, and other cellulosic fibers.
• Leather Coloring: Used for dyeing leather goods, providing good penetration and fastness.
• Pad-Batch Dyeing: Suitable for cold pad-batch processes, offering energy efficiency.
• Yarn Dyeing: Effective for dyeing cellulosic yarns in hank or package form.
• Union Dyeing: Can be used in combination with other dyes for coloring fiber blends.
• Printing Pastes: Formulated into pastes for textile printing applications.

Basic Information

Product Name	C.I. Reactive Yellow 51
CAS No.	61969-33-3
Molecular Formula	C23H17ClN7Na3O11S3
Molecular Weight	808.00 g/mol
Synonyms	Reactive Yellow KE-3G; Reactive Yellow KE-3N; Reactive Yellow M-3G; C.I. 18971; Reactive Yellow 51; Vinylsulfone Reactive Yellow KE-3G; 2,7-Naphthalenedisulfonic acid, 5-[[4-chloro-6-[(3-sulfophenyl)amino]-1,3,5-triazin-2-yl]amino]-4-hydroxy-3-[(2-sulfooxyethyl)sulfonyl]phenyl]azo]-, trisodium salt
EINECS	Contact for details

Quality Control

Our C.I. Reactive Yellow 51 is manufactured under a stringent quality management system. Every batch undergoes rigorous testing for critical parameters including color strength, shade, solubility, and fastness properties to ensure consistent performance and batch-to-batch uniformity. Certificates of Analysis (COA) detailing purity, physical properties, and application test results 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). This material is hygroscopic (moisture-sensitive); ensure the container is kept tightly sealed to prevent absorption of atmospheric moisture.

Specification

Item	Specification
Appearance	Yellow to orange powder
Color Strength	100 ± 3% (vs. Standard)
Moisture Content	≤ 5.0%
Water Solubility (at 50°C)	≥ 100 g/L
pH (1% Solution)	6.0 - 8.0
Identification (IR)	Conforms
Fastness Properties	Conforms to industry standards

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