Description

C.I. Reactive Black 11 is a high-performance, bifunctional reactive dye belonging to the vinyl sulfone and chlorotriazine class, widely recognized for its deep black shade and excellent fastness properties. Its primary value lies in delivering superior wash, light, and perspiration fastness on cellulosic fibers like cotton and viscose, ensuring long-lasting color integrity. This dye is essential for textile manufacturers and dye houses seeking efficient, high-quality coloration for apparel, home textiles, and industrial fabrics. The product is supplied as a consistent, high-strength powder to ensure reliable and reproducible dyeing results in exhaust, pad-batch, and continuous dyeing processes.

Application

• Exhaust Dyeing of Cotton: Ideal for jet, overflow, and beam dyeing machines to achieve deep black shades with excellent penetration and levelness.
• Pad-Batch Dyeing: Used in cold pad-batch processes for energy-efficient dyeing of woven and knitted cotton fabrics.
• Continuous Dyeing: Applied in pad-steam and pad-dry thermofix ranges for high-volume production of dyed fabrics.
• Viscose and Rayon Dyeing: Provides vibrant and fast black colors on regenerated cellulosic fibers.
• Union Dyeing: Effective for dyeing cotton blends with polyester or other synthetic fibers in combination with appropriate disperse dyes.
• Garment Dyeing: Suitable for achieving fashionable black finishes on finished cotton garments.

Basic Information

Product Name	C.I. Reactive Black 11
CAS No.	12225-29-5
Molecular Formula	C26H21N5O19S6.xNa
Molecular Weight	Contact for details
Synonyms	Reactive Black 11; Reactive Black B; Reactive Black K-B; C.I. 12225-29-5; Remazol Black B; Levafix Black E-B; Dianix Black B; Procion Black H-EXL; Vinylsulfone Black Dye; Bifunctional Reactive Black Dye
EINECS	Contact for details

Quality Control

Our production of C.I. Reactive Black 11 adheres to stringent quality management protocols to ensure batch-to-batch consistency and performance reliability. Every lot is tested against key parameters including shade, strength, solubility, and fixation properties. We provide comprehensive Certificates of Analysis (COA) detailing all test results, and our quality systems are designed to meet the demands of global textile supply chains.

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. The original container is designed to protect the product; avoid transferring to non-compatible containers.

Specification

Item	Specification
Appearance	Black to Bluish-Black Powder
Color Strength	100 ± 3% (Standard)
Moisture Content	≤ 7.0%
Water Solubility (at 50°C)	≥ 100 g/L
pH (1% Solution)	5.0 - 7.0
Dusting Property	Low
Fixation Rate	≥ 70% (Standard Conditions)
Identification (IR)	Conforms to Standard

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