Description

C.I. Reactive Black 41 is a high-performance, bifunctional reactive dye belonging to the vinyl sulfone and chlorotriazine chemical classes. This compound is engineered to deliver exceptional color yield and wash-fastness on cellulosic fibers, making it a cornerstone for durable, deep black shades in textile processing. It is primarily utilized by dye manufacturers and textile mills engaged in the production of cotton, viscose, and linen fabrics. Our supply of C.I. Reactive Black 41 CAS NO 71872-70-3 is backed by stringent quality control to ensure batch-to-batch consistency for industrial applications.

Application

• Primary dyeing and printing of cotton and other cellulosic fibers.
• Exhaust dyeing processes for yarn and piece goods to achieve high wet-fastness properties.
• Continuous pad-dry-steam and pad-batch dyeing operations in modern textile mills.
• Formulation of liquid and powder dye preparations for the textile industry.
• Used in combination with other reactive dyes to produce a wide range of compound shades.
• Application on viscose (rayon) and linen for fashion and home textiles.

Basic Information

Product Name	C.I. Reactive Black 41
CAS No.	71872-70-3
Molecular Formula	C31H19ClN7Na4O19S6
Molecular Weight	1084.36 g/mol
Synonyms	Reactive Black 41; Reactive Black KN-G2RC; C.I. 218121; Reactive Black H-NG; Remazol Black B; Vinylsulfone Reactive Dye Black 41; 2,7-Naphthalenedisulfonic acid, 4-amino-5-hydroxy-3-[[4-[[2-(sulfooxy)ethyl]sulfonyl]phenyl]azo]-6-[[4-[[2-[(4,6-dichloro-1,3,5-triazin-2-yl)amino]ethyl]sulfonyl]phenyl]azo]-, tetrasodium salt
EINECS	Contact for details

Quality Control

Our C.I. Reactive Black 41 is manufactured under a strict quality management system. Every batch is tested to confirm critical parameters such as color strength, solubility, and fixation rate, ensuring it meets the demanding requirements of industrial dyeing processes. A comprehensive Certificate of Analysis (COA) detailing purity, shade, and physical properties is provided with each shipment to guarantee traceability and performance 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	Black powder or granules
Identification (IR)	Conforms to structure
Color Strength	100 ± 3% (vs. Standard)
Moisture Content	≤ 5.0%
Water Solubility	≥ 100 g/L (at 50°C)
pH (1% Solution)	5.0 - 7.0
Fixation Rate	≥ 70%
Dusting Property	Low dusting

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