Description

Direct Black 22 is a synthetic diazo direct dye belonging to the benzidine derivative class, widely recognized for its deep, intense black shade and excellent substantivity to cellulosic fibers. Its primary value lies in providing a cost-effective and reliable coloring solution with good wash and light fastness properties for industrial dyeing processes. This product is essential for manufacturers in the textile, leather, and paper industries seeking consistent, high-volume dyeing of materials like cotton, viscose, and paper pulp.

Application

• Primary dyeing and continuous dyeing of cotton and other cellulosic textiles.
• Coloration of viscose rayon and blended fabrics.
• Dyeing of leather to achieve deep black finishes.
• Pigmentation of paper and paperboard.
• Used in the production of inks and toners.
• Coloring for wood stains and other specialty applications.

Basic Information

Product Name	Direct Black 22
CAS No.	6473-13-8
Molecular Formula	C34H25N9Na2O7S2
Molecular Weight	781.72 g/mol
Synonyms	Direct Black BN; C.I. Direct Black 22; Direct Deep Black EW; Direct Black 22 (C.I. 35435); Pontamine Black E; Benzidine Black EW; Aizen Direct Deep Black EW; Atlantic Black BN; Chloramine Black EW
EINECS	229-314-2

Quality Control

Our Direct Black 22 is manufactured under a stringent quality management system to ensure batch-to-batch consistency and performance reliability. Each lot is tested against key parameters including color strength, shade, solubility, and impurity profile. Certificates of Analysis (COA) detailing these specifications are provided with every shipment to support your quality assurance and regulatory compliance needs.

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 incompatible materials. The product is light-sensitive and should be stored away from direct light exposure to maintain stability.

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.