Description

Direct Black Gb is a high-performance, substantive azo dye widely used in industrial coloration processes. Its primary value lies in its excellent affinity for cellulosic fibers, providing deep, uniform black shades with good fastness properties. This product is essential for manufacturers in the textile, leather, and paper industries seeking reliable and cost-effective dyeing solutions. We supply this chemical with consistent quality to meet the rigorous demands of global industrial applications.

Application

• Textile Dyeing: Primary application for dyeing cotton, viscose, and other cellulosic fibers to achieve deep black shades.
• Leather Processing: Used in the dyeing of leather goods, providing rich color and good penetration.
• Paper Coloration: Employed in the production of colored papers, including specialty packaging and decorative papers.
• Ink Formulation: A key component in the manufacture of certain types of industrial inks and toners.
• Wood Staining: Utilized for imparting color to wood and wood-based products.
• Biological Staining (Histology): May be used in specific laboratory staining procedures for microscopic analysis.

Basic Information

Product Name	Direct Black Gb
CAS No.	12220-20-1
Molecular Formula	C34H25N9Na2O7S2
Molecular Weight	781.72 g/mol
Synonyms	Direct Black GB; C.I. Direct Black 22; Direct Deep Black EW; Pontamine Black E; Direct Black B; Direct Black G; Benzo Deep Black G; Atul Direct Black G; Airedale Black G; Sirius Black G
EINECS	235-414-6

Quality Control

Our Direct Black Gb is manufactured under a stringent quality management system to ensure batch-to-batch consistency and performance reliability. Each lot is tested against established specifications for key parameters including color strength, shade, solubility, and impurity profile. A Certificate of Analysis (COA) documenting these results is provided with every shipment to guarantee compliance with your technical requirements.

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 product is light-sensitive (store away from light).

Specification

Item	Specification
Appearance	Black to Bluish-Black Powder
Identification (IR)	Conforms to Standard
Color Strength	100 ± 3% (Standard)
Shade	Conforms to Standard
Moisture Content	≤ 5.0%
Water Insoluble Matter	≤ 1.0%
pH (1% Solution)	6.0 - 8.0
Fastness Properties	To be specified per grade

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