Description

Reactive Yellow 77 is a high-performance, water-soluble reactive dye belonging to the vinyl sulfone class, known for its bright 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 with high fixation rates. This dye is essential for textile manufacturers and dye houses specializing in cotton, viscose, and other cellulose-based materials, as well as for applications in leather and paper dyeing where vibrant, durable yellow shades are required.

Application

• Exhaust dyeing and continuous dyeing of cotton fabrics and yarns.
• Pad-batch and pad-steam dyeing processes for cellulosic textiles.
• Coloration of viscose rayon and other regenerated cellulose fibers.
• Dyeing of leather to achieve bright, fast yellow colors.
• Surface coloring and coating of specialty papers.
• Used in combination with other reactive dyes to produce a wide spectrum of green and orange shades.

Basic Information

Product Name	Reactive Yellow 77
CAS No.	85854-36-0
Molecular Formula	C29H19ClN7Na3O15S4
Molecular Weight	991.22 g/mol
Synonyms	Reactive Yellow VS-R; C.I. Reactive Yellow 77; Vinylsulfone Reactive Yellow 77; Remazol Yellow RR; Levafix Yellow E-RA; Drimarene Yellow R-K2L; Yellow 77 Reactive Dye; 2,7-Naphthalenedisulfonic acid, 5-[[4-chloro-6-[(3-sulfophenyl)amino]-1,3,5-triazin-2-yl]amino]-4-hydroxy-3-[[2-(sulfooxy)ethyl]sulfonyl]phenyl]azo]-, trisodium salt
EINECS	Contact for details

Quality Control

Our Reactive Yellow 77 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 properties. A comprehensive Certificate of Analysis (COA) detailing purity, physical properties, and application performance is provided with each shipment 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). This product is hygroscopic (moisture-sensitive); ensure the original packaging is sealed after use to prevent caking or degradation due to humidity.

Specification

Item	Specification
Appearance	Yellow to orange powder
Color Strength	100 ± 3% (Standard)
Solubility in Water	≥ 100 g/L (at 50°C)
pH (1% Solution)	6.0 - 8.0
Moisture Content	≤ 5.0%
Dye Content	≥ 70%
Identification (IR)	Conforms to standard
Fixation Rate	≥ 75% (on cotton)

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