Description

Reactive Yellow 55 is a high-performance, water-soluble reactive dye belonging to the azo dye class, widely recognized for its vibrant yellow hue and excellent fastness properties. Its primary value lies in its ability to form a strong covalent bond with cellulosic fibers, ensuring brilliant, wash-fast coloration critical for demanding textile applications. This dye is essential for manufacturers in the textile industry, particularly for dyeing and printing cotton, viscose, and other natural fibers, where consistent color yield and durability are paramount.

Application

• Exhaust Dyeing of Cotton: Primary application for achieving deep and level shades on yarns and fabrics in jet, overflow, and beam dyeing machines.
• Continuous Dyeing of Cellulosics: Used in pad-batch and pad-steam processes for efficient, high-volume production of colored fabrics.
• Textile Printing: Formulated for printing pastes to create sharp, well-defined patterns on cotton and viscose with good fixation.
• Union Dyeing: Effective for dyeing blends of cotton with polyester or nylon, often in combination with other dye classes.
• Leather Coloring: Applied for dyeing leather goods where a bright, reactive yellow color is required.
• Paper Staining: Used in specialty paper production for coloring where high lightfastness is needed.

Basic Information

Product Name	Reactive Yellow 55
CAS No.	12769-12-9
Molecular Formula	C25H20ClN7Na4O16S4
Molecular Weight	1029.23 g/mol
Synonyms	Reactive Yellow M-5R; C.I. Reactive Yellow 55; Reactive Brilliant Yellow M-5R; Reactive Yellow H-5R; 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, Tetrasodium Salt; Yellow M5R; Novacron Yellow P-5R; Levafix Yellow E-5R
EINECS	Contact for details

Quality Control

Our Reactive Yellow 55 is manufactured under a stringent quality management system to ensure batch-to-batch consistency and performance reliability. Every lot is tested against key parameters including color strength, shade, solubility, and fixation rate. A Certificate of Analysis (COA) detailing purity, physical properties, and application performance is provided with each shipment to guarantee it meets the specifications required for industrial textile processing.

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; ensure the original packaging is sealed after use to minimize exposure to atmospheric moisture.

Specification

Item	Specification
Appearance	Yellow to Brownish-Yellow Powder
Identification (IR)	Conforms
Color Strength	100 ± 3% (Standard)
Shade	Conforms to Standard
Solubility in Water	≥ 100 g/L (at 50°C)
Moisture Content	≤ 5.0%
pH (1% Solution)	6.0 - 8.0
Fixation Rate	≥ 70% (on cotton)

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