Description

Direct Fast Brown Bx is a high-performance, water-soluble azo dye belonging to the direct dye class. It is valued for its excellent substantivity to cellulosic fibers, providing deep and level shades with good fastness properties. This product is essential for textile manufacturers and dye houses requiring a reliable brown dye for cotton, viscose, and other natural fibers. Its consistent quality ensures reproducible results in dyeing and printing applications.

Application

• Textile Dyeing: Primary application for dyeing cotton, rayon, viscose, and other cellulosic fibers to achieve various shades of brown.
• Leather Coloring: Used in the leather industry for dyeing hides and finished leather goods.
• Paper Staining: Effective for coloring paper pulp to produce tinted papers and boards.
• Ink Formulation: A component in the manufacture of inks for specific printing applications.
• Biological Staining: Potential use as a histological stain in laboratory settings (subject to specific grade purity).
• Wood Staining: Applied for coloring wood and wood-based products.

Basic Information

Product Name	Direct Fast Brown Bx
CAS No.	3476-90-2
Molecular Formula	C35H25N7Na2O10S2
Molecular Weight	813.78 g/mol
Synonyms	Direct Brown Bx; C.I. Direct Brown 2; Direct Fast Brown B; Direct Brown B; Amanil Fast Brown BX; Atul Direct Fast Brown BX; Benzo Fast Brown BX; Chloramine Fast Brown BX; Diamine Fast Brown BX; Diphenyl Fast Brown BX
EINECS	222-456-7

Quality Control

Our Direct Fast Brown Bx is manufactured under a stringent quality management system. Each batch is tested against established internal specifications to ensure consistent shade, strength, solubility, and fastness properties. While this is an industrial-grade product, we can provide material tailored to specific application requirements. A Certificate of Analysis (COA) detailing key parameters 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 material is hygroscopic (moisture-sensitive); ensure the container is kept tightly sealed to prevent absorption of atmospheric moisture, which can affect performance.

Specification

Item	Specification
Appearance	Brown to dark brown powder
Identification (IR)	Conforms to standard
Assay (Dye Content)	Min. 95%
Moisture Content	Max. 5.0%
Water Solubility	Conforms
Shade	Conforms to standard pattern
Fastness Properties (Typical)	Light: 4-5; Wash: 3-4; Water: 3-4

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