Description

Reactive Black 8 is a high-performance, bifunctional reactive dye belonging to the vinyl sulfone and chlorotriazine class. It is engineered to deliver exceptional color yield and wash-fastness on cellulosic fibers like cotton and viscose, making it a cornerstone for demanding textile applications. This dye is primarily utilized by textile manufacturers and dye houses seeking reliable, deep black shades with excellent reproducibility and process economy. Its robust chemical structure ensures superior fixation rates and minimal hydrolyzed dye in effluent, supporting more sustainable dyeing operations.

Application

• Exhaust Dyeing of Cotton: Ideal for batchwise dyeing processes in jet, overflow, and winch machines, providing level dyeing and high fixation.
• Continuous Dyeing of Cellulosics: Used in pad-steam and pad-dry-chemical pad-steam ranges for efficient, large-scale production of dark shades.
• Viscose and Lyocell Dyeing: Offers brilliant and uniform shades on regenerated cellulose fibers with good fastness properties.
• Garment Dyeing: Suitable for dyeing finished cotton garments, ensuring consistent and vibrant black colors.
• Textile Printing: Can be formulated into printing pastes for direct and discharge styles on cellulose fabrics.
• Union Dyeing with Cellulose Blends: Effective in dyeing polyester/cotton or nylon/cotton blends when used in combination with appropriate disperse or acid dyes.

Basic Information

Product Name	Reactive Black 8
CAS No.	12225-26-2
Molecular Formula	C26H21N5Na4O19S6
Molecular Weight	991.80 g/mol
Synonyms	Reactive Black 8; C.I. Reactive Black 8; Remazol Black B; Levafix Black E-B; Procion Black H-EXL; Dianix Black BD-FS; Kayacion Black P-N; Vinylsulfone Black; 2,7-Naphthalenedisulfonic acid, 4-amino-5-hydroxy-3-[[4-[[2-(sulfooxy)ethyl]sulfonyl]phenyl]azo]-6-[[4-[[2-(sulfooxy)ethyl]sulfonyl]phenyl]azo]-, tetrasodium salt
EINECS	Contact for details

Quality Control

Every batch of Reactive Black 8 is subjected to rigorous analytical testing to ensure it meets stringent specifications for strength, shade, and solubility. Our quality assurance protocol includes verification against key industry standards for reactive dyes. Certificates of Analysis (COA) detailing purity, inorganic salt content, and performance characteristics are available upon request to support your quality management systems.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at ambient temperature (15-25°C). Keep away from strong oxidizing agents and excessive heat. The original container is designed to maintain product integrity under recommended conditions.

Specification

Item	Specification
Appearance	Black to Bluish-Black Powder
Identification (IR)	Conforms to Standard
Color Strength	100 ± 3% (Standard)
Moisture Content	≤ 5.0%
Water Insoluble Matter	≤ 0.2%
pH (1% Solution)	6.0 - 8.0
Fixation Rate	≥ 70% (Standard Conditions)
Fastness Properties	Wash Fastness: ≥ 4; Light Fastness: ≥ 5

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