Description

Direct Black 103 is a high-performance, synthetic diazo dye belonging to the direct dye class, valued 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 textile applications. This product is essential for manufacturers in the textile dyeing and printing industries, particularly for coloring cotton, viscose, and other regenerated cellulose materials.

Application

• Primary application in the exhaust dyeing of cotton and viscose yarns and fabrics.
• Used in the continuous dyeing and pad-batch processes for cellulosic textiles.
• Employed in the paper industry for coloring paper pulp to achieve deep black shades.
• Suitable for dyeing leather, providing a uniform and deep black color.
• Can be used in the coloration of regenerated cellulose fibers like lyocell and modal.
• Applied in the production of black ink for specific industrial printing applications.

Basic Information

Product Name	Direct Black 103
CAS No.	25180-17-0
Molecular Formula	C34H25N9Na4O13S4
Molecular Weight	1023.86 g/mol
Synonyms	Direct Black 103; C.I. Direct Black 103; Direct Black EX; Direct Black G; Direct Black NB; Direct Black V; Direct Deep Black EW; Amanil Black NB; Atul Direct Black NB; Benzo Deep Black NB; Chloramine Fast Black NB; Diamine Deep Black EW; Sirius Black NB; Solar Black NB; Pontamine Black NB
EINECS	Contact for details

Quality Control

Our Direct Black 103 is manufactured under a stringent quality management system to ensure batch-to-batch consistency and performance reliability. Each production lot undergoes comprehensive testing against established internal specifications for key parameters such as color strength, shade, solubility, and fastness properties. While this is an industrial-grade product, we ensure it meets the high standards required for commercial textile applications. A Certificate of Analysis (COA) detailing specific test results is available for every shipment upon request.

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). This product is hygroscopic (moisture-sensitive); therefore, the container must be kept tightly sealed when not in use to prevent absorption of atmospheric moisture, which can affect performance. Keep away from incompatible materials.

Specification

Item	Specification
Appearance	Black to Bluish-Black Powder
Identification	Conforms (IR / TLC)
Color Strength	100 ± 3% (Standard)
Shade	Conforms to Standard
Moisture Content	≤ 5.0%
Water Insoluble Matter	≤ 1.0%
Solubility in Water	Conforms
Fastness Properties (Typical)	Wash: 3-4; Light: 4-5

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