Description

Reactive Yellow 56 is a high-purity, water-soluble anionic dye belonging to the reactive azo dye class, identified by CAS NO 12731-76-9. It is engineered for exceptional color fastness and brilliant yellow hues, forming a stable covalent bond with cellulosic fibers for durable coloration. This product is essential for manufacturers in the textile industry seeking reliable, vibrant, and wash-resistant dyes for cotton, viscose, and other natural fabrics.

Application

• Textile Dyeing: Primary application for exhaust and continuous dyeing of cotton, linen, and regenerated cellulose fibers like viscose and modal.
• Textile Printing: Used in printing pastes for creating sharp, bright yellow patterns on cellulosic fabrics with excellent wash-fastness.
• Leather Coloring: Imparts stable and vibrant yellow colors to leather goods.
• Paper Coloring: Suitable for tinting paper products where good water fastness is required.
• Biomaterial Staining: Potential use as a selective stain in laboratory and diagnostic applications.
• Industrial Colorant: For coloring non-textile materials where reactive properties with hydroxyl groups are beneficial.

Basic Information

Product Name	Reactive Yellow 56
CAS No.	12731-76-9
Molecular Formula	C29H19ClN7Na3O15S4
Molecular Weight	995.18 g/mol
Synonyms	Reactive Yellow M-5R; C.I. Reactive Yellow 56; Reactive Brilliant Yellow M-5R; Reactive Yellow H-5R; Yellow Reactive Dye 56; 5-[(4,6-Dichloro-1,3,5-triazin-2-yl)amino]-4-hydroxy-3-[[2-methoxy-5-[(2-sulfophenyl)azo]phenyl]azo]-2,7-naphthalenedisulfonic Acid Trisodium Salt; Triazinyl Yellow Azo Dye
EINECS	Contact for details

Quality Control

Our Reactive Yellow 56 is manufactured under a stringent quality management system. Every batch undergoes rigorous testing for key parameters including color strength, shade, solubility, and reactive group content to ensure consistency and performance. Certificates of Analysis (COA) documenting purity, physical properties, and application performance are available upon request to support your quality assurance protocols.

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 excessive heat. The product is light-sensitive (store away from light) and hygroscopic (moisture-sensitive); ensure the original packaging is resealed after use to prevent moisture absorption and caking.

Specification

Item	Specification
Appearance	Yellow to Orange Powder
Identification (IR)	Conforms
Color Strength	100 ± 3% (vs. Standard)
Moisture Content	≤ 5.0%
Water Solubility	≥ 50 g/L (at 25°C)
pH (1% Solution)	5.0 - 7.0
Shade	Within agreed tolerance
Dusting Property	Low

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