Description

4-[[4-chloro-6-[(4-sulphophenyl)amino]-1,3,5-triazin-2-yl]amino]-2-[[1-(2,5-dichloro-4-sulphophenyl)-4,5-dihydro-3-methyl-5-oxo-1H-pyrazol-4-yl]azo]benzenesulphonic acid CAS NO 16893-48-4 is a high-performance, water-soluble anionic dye belonging to the reactive dye class, specifically engineered for demanding coloration applications. Its molecular architecture, featuring multiple sulphonic acid groups and reactive chlorotriazine moieties, provides exceptional substantivity and colorfastness properties on cellulosic fibers. This product is essential for manufacturers in the textile industry seeking vibrant, wash-fast, and light-fast shades, particularly in dyeing and printing processes for cotton, viscose, and other natural fibers.

Application

• Primary Textile Dyeing: Exhaust and continuous dyeing of cotton, linen, rayon, and other cellulosic fabrics to achieve deep, uniform shades with excellent wet fastness.
• Textile Printing: Used in pigment printing pastes and inks for creating sharp, durable patterns on apparel and home textiles.
• Leather Coloration: Application in dyeing finished leather and suede for footwear, upholstery, and fashion accessories, offering good penetration and levelness.
• Paper Coloring: Imparting color to specialty papers, including decorative and packaging grades, where water solubility and brightness are key.
• Ink Formulation: A key colorant component in the manufacture of inks for ink-jet printing and other aqueous-based ink systems.
• Research & Development: Serves as a standard or intermediate in chemical research for developing new dyes, studying dye-fiber interactions, and analytical method development.

Basic Information

Product Name	4-[[4-chloro-6-[(4-sulphophenyl)amino]-1,3,5-triazin-2-yl]amino]-2-[[1-(2,5-dichloro-4-sulphophenyl)-4,5-dihydro-3-methyl-5-oxo-1H-pyrazol-4-yl]azo]benzenesulphonic acid
CAS No.	16893-48-4
Molecular Formula	C26H18Cl3N9O9S3
Molecular Weight	822.96 g/mol
Synonyms	Reactive Black 5; C.I. Reactive Black 5; Remazol Black B; Drimarene Black K-2B; Levafix Black E-B; Procion Black H-EXL; Sumifix Black B; Lanasol Black B; C.I. 20505; 4-[[4-Chloro-6-[(4-sulfophenyl)amino]-1,3,5-triazin-2-yl]amino]-5-hydroxy-6-[[1-(2,5-dichloro-4-sulfophenyl)-4,5-dihydro-3-methyl-5-oxo-1H-pyrazol-4-yl]azo]naphthalene-2,7-disulfonic acid (related form)
EINECS	240-949-5

Quality Control

Our production of Reactive Black 5 adheres to stringent quality management protocols to ensure batch-to-batch consistency and performance reliability. Every lot is analyzed against comprehensive specifications, including color strength, shade, solubility, and reactive group content. Certificates of Analysis (COA) detailing purity, impurity profile, and physical-chemical parameters are provided with each shipment. Our quality system is designed to meet the demands of industrial-scale textile manufacturing and is supported by ISO 9001 quality management standards.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at a controlled room temperature (15-25°C). Due to its hygroscopic nature, the container must be kept tightly sealed after each use to prevent moisture absorption, which can affect product performance and flow characteristics. Keep away from incompatible materials such as strong oxidizing agents.

Specification

Item	Specification
Appearance	Black to Bluish-Black Powder
Identification (IR)	Conforms to Standard
Color Strength	100% ± 3% (vs. Standard)
Assay (HPLC)	≥ 95.0%
Moisture Content	≤ 5.0%
Water Solubility	≥ 100 g/L (at 25°C)
pH (1% Solution)	5.0 - 7.0
Ash Content	≤ 0.5%
Heavy Metals (as Pb)	≤ 20 ppm

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