Description

Reactive Black 5 is a high-performance, bifunctional reactive dye belonging to the vinyl sulfone and chlorotriazine class. This product is essential for achieving deep, durable black shades with excellent wash and light fastness on cellulosic fibers. It is a critical component for textile manufacturers, leather tanneries, and paper mills requiring consistent, high-quality coloration. The compound is supplied as a high-purity powder to ensure reliable batch-to-batch performance in industrial dyeing processes.

Application

• Exhaust and continuous dyeing of cotton, viscose, and other cellulosic fabrics.
• Printing applications on textile substrates to produce sharp, black designs.
• Dyeing of leather to achieve uniform and colorfast black finishes.
• Coloration of paper and specialty non-woven materials.
• Used in the formulation of ink for specific technical applications.
• Research and development of new dyeing processes and material science.

Basic Information

Product Name	Reactive Black 5
CAS No.	12225-25-1
Molecular Formula	C26H21N5Na4O19S6
Molecular Weight	991.82 g/mol
Synonyms	Reactive Black B; C.I. Reactive Black 5; Remazol Black B; Levafix Black E-B; Procion Black H-EXL; Vinylsulfone Black; 4-Amino-5-hydroxy-3,6-bis((4-((2-(sulfonatooxy)ethyl)sulfonyl)phenyl)azo)-2,7-naphthalenedisulfonic Acid Tetrasodium Salt
EINECS	235-439-6

Quality Control

Our Reactive Black 5 is manufactured under a strict quality management system. Every batch is tested to ensure it meets high-purity standards for consistent dyeing performance, with key parameters including color strength, solubility, and fixation rate. Certificates of Analysis (COA) detailing purity, heavy metal content, and physical specifications 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). Keep away from strong oxidizing agents and moisture to maintain product integrity.

Specification

Item	Specification
Appearance	Black to Bluish-Black Powder
Identification (IR)	Conforms to Standard
Color Strength	≥ 100% (Standard)
Assay (HPLC)	≥ 95.0%
Moisture Content	≤ 5.0%
Water Solubility	≥ 100 g/L (at 50°C)
pH (1% Solution)	5.5 - 7.5
Heavy Metals (as Pb)	≤ 20 ppm

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