Description

Reactive Black 5 is a high-purity, bifunctional reactive dye belonging to the vinyl sulfone and chlorotriazine class, offering excellent color yield and wash-fastness. Its primary value lies in its ability to form strong covalent bonds with cellulose fibers, ensuring vibrant, durable, and consistent coloration in demanding textile applications. This product is essential for industrial dyers and textile manufacturers specializing in cotton, viscose, and other cellulosic materials, where reliable shade reproduction and process efficiency are critical.

Application

• Exhaust dyeing and continuous dyeing of cotton and viscose fibers.
• Pad-batch and pad-steam dyeing processes for woven and knitted fabrics.
• Primary coloring agent for the production of deep, rich black shades in cellulosic textiles.
• Used in combination with other reactive dyes to achieve complex color formulations.
• Application in the dyeing of yarn and ready-made garments.
• Suitable for use in modern, low-salt or salt-free dyeing processes to meet environmental standards.

Basic Information

Product Name	Reactive Black 5
CAS No.	17095-24-8
Molecular Formula	C26H21N5Na4O19S6
Molecular Weight	991.82 g/mol
Synonyms	Reactive Black B; C.I. Reactive Black 5; Remazol Black B; Levafix Black EB; Procion Black H-EXL; Dinazol Black B; Sumifix Black B; Tetrakisodium 4-amino-5-hydroxy-3,6-bis((4-((2-(sulfonatooxy)ethyl)sulfonyl)phenyl)azo)naphthalene-2,7-disulfonate
EINECS	241-157-0

Quality Control

Our Reactive Black 5 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, solubility, and fixation properties. A comprehensive Certificate of Analysis (COA) detailing purity, shade, and physical-chemical specifications 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). Keep away from strong oxidizing agents and excessive heat. The product is hygroscopic; ensure the container is resealed tightly after each use to prevent moisture absorption.

Specification

Item	Specification
Appearance	Black to bluish-black powder
Color Strength	≥ 100% (vs. Standard)
Moisture Content	≤ 7.0%
Water Solubility (at 50°C)	≥ 100 g/L
pH (1% Solution)	5.5 - 7.5
Identification (IR)	Conforms to Standard
Assay (HPLC)	≥ 70% (Pure Dye Content)
Fixation Rate	≥ 70%

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