Description

Octasodium 2,2'-[(2,2'-disulphonato[1,1'-biphenyl]-4,4'-diyl)bis[imino(6-chloro-1,3,5-triazine-4,2-diyl)imino(1-hydroxy-3-sulphonatonaphthalene-6,2-diyl)azo]]bisnaphthalene-1,5-disulphonate is a high-performance, water-soluble anionic dye belonging to the reactive dye class. Its complex polyazo structure provides exceptional color strength and fastness properties, making it a critical component for demanding coloration applications. This product is essential for manufacturers in the textile, paper, and specialty ink industries seeking vibrant, durable, and wash-resistant colors.

Application

• Textile Dyeing: Primary application for dyeing cellulosic fibers like cotton, viscose, and linen, offering excellent wash and light fastness.
• Paper Coloring: Used in the production of high-quality colored papers, including specialty packaging and decorative papers.
• Ink Formulation: A key pigment for manufacturing inks used in flexographic, gravure, and inkjet printing, particularly where water solubility is required.
• Leather Finishing: Employed in the dyeing of leather goods to achieve deep, uniform, and fast colors.
• Biological Staining: Potential use as a histological stain in laboratory settings due to its specific affinity.
• Colorant for Detergents & Soaps: Used to impart color to cleaning and personal care products.

Basic Information

Product Name	Octasodium 2,2'-[(2,2'-disulphonato[1,1'-biphenyl]-4,4'-diyl)bis[imino(6-chloro-1,3,5-triazine-4,2-diyl)imino(1-hydroxy-3-sulphonatonaphthalene-6,2-diyl)azo]]bisnaphthalene-1,5-disulphonate
CAS No.	68110-30-5
Molecular Formula	C68H28Cl2N16Na8O28S8
Molecular Weight	~1991.2 g/mol
Synonyms	Reactive Black 5 (common name); C.I. 20505; Remazol Black B; Levafix Black E-B; Procion Black H-EXL; Sumifix Black B; Dianix Black BG-FS; Polyazo Black Dye
EINECS	Contact for details

Quality Control

Our production of Reactive Black 5 adheres to stringent quality protocols to ensure batch-to-batch consistency and performance reliability. Every lot is tested against key parameters including color strength, shade, solubility, and impurity profile. A comprehensive Certificate of Analysis (COA) detailing purity, physical properties, and conformance to specification is provided with each shipment.

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). Due to its hygroscopic nature, the container must be kept tightly sealed to prevent moisture absorption, which can affect performance. Keep away from incompatible materials.

Specification

Item	Specification
Appearance	Black to Bluish-Black Powder
Identification (IR)	Conforms to Standard
Color Strength	≥ 100% (vs. Standard)
Moisture Content	≤ 5.0%
Water Solubility (at 25°C)	≥ 100 g/L
pH (1% Solution)	6.0 - 8.0
Ash Content	≤ 30.0%
Heavy Metals (as Pb)	≤ 20 ppm

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