Description

Reactive Blue 81 is a high-purity, anthraquinone-based reactive dye known for its excellent color fastness and brilliant blue hue. This product is essential for achieving consistent, vibrant, and wash-resistant coloration in cellulose fibers. It is primarily required by textile manufacturers and dye houses specializing in cotton, viscose, and other cellulosic materials, where performance and batch-to-batch consistency are critical for commercial success.

Application

• Exhaust dyeing and continuous dyeing of cotton fabrics and yarns.
• Coloration of viscose (rayon) and other regenerated cellulose fibers.
• Used in the printing of cellulosic textiles to create sharp, defined patterns.
• Dyeing of linen and hemp for home furnishing and apparel applications.
• Potential use in the coloration of paper and specialty cellulosic non-wovens.
• Formulation of liquid dye preparations for automated dosing systems in modern dye houses.

Basic Information

Product Name	Reactive Blue 81
CAS No.	75030-18-1
Molecular Formula	C29H20ClN7O11S3
Molecular Weight	774.16 g/mol
Synonyms	Reactive Blue 81; C.I. Reactive Blue 81; Remazol Brilliant Blue R; Levafix Brilliant Blue E-B; Procion Blue H-ERD; Drimarene Brilliant Blue K-2RL; Sumifix Brilliant Blue BR; Bezaktiv Blue V-3R; Anthraquinone, 1-amino-4-[3-[(4,6-dichloro-1,3,5-triazin-2-yl)amino]-4-sulfophenyl]amino]-9,10-dihydro-9,10-dioxo-, sodium salt
EINECS	Contact for details

Quality Control

Our Reactive Blue 81 is manufactured under a stringent quality management system to ensure it meets the high standards required for industrial textile applications. Every batch is tested for critical parameters including color strength, shade, solubility, and fixation properties. A comprehensive Certificate of Analysis (COA) detailing purity, physical properties, and performance characteristics is provided with each shipment to guarantee traceability and consistency.

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); the original container must be kept tightly sealed to prevent absorption of atmospheric moisture, which can affect performance.

Specification

Item	Specification
Appearance	Blue Powder
Identification (IR)	Conforms
Color Strength	100 ± 3% (Standard)
Shade	Conforms to Standard
Moisture Content	≤ 5.0%
Water Solubility	≥ 50 g/L (at 50°C)
Fixation Rate	≥ 70%
Dusting Property	Low

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