Description

Direct Brown 44 is a synthetic azo dye belonging to the class of direct dyes, known for their ability to dye cellulose fibers like cotton, viscose, and paper without the need for a mordant. Its primary value lies in providing a durable, cost-effective brown coloration with good wash and light fastness properties for cellulosic materials. This dye is essential for manufacturers in the textile, paper, and leather industries seeking consistent and reliable brown shades for their products.

Application

• Textile Dyeing: Primarily used for dyeing cotton, viscose rayon, and other cellulosic fibers to achieve various shades of brown.
• Paper Coloring: Applied in the production of colored papers, tissues, and paperboard where a uniform brown hue is required.
• Leather Finishing: Utilized in the dyeing of leather goods, providing rich brown tones for footwear, apparel, and accessories.
• Ink Formulation: Serves as a colorant in the manufacture of inks for specific printing applications.
• Biological Staining: May be employed in laboratory settings as a histological stain for microscopic analysis.

Basic Information

Product Name	Direct Brown 44
CAS No.	6252-62-6
Molecular Formula	C35H25N9Na4O13S4
Molecular Weight	1047.89 g/mol
Synonyms	Direct Brown 44; Direct Brown G; C.I. Direct Brown 44; Direct Brown G (C.I. 35005); Benzo Brown G; Chloramine Brown G; Columbia Brown G; Diazol Brown G; Diphenyl Brown G; Sirius Brown G; Solophenyl Brown G; Solar Brown G
EINECS	228-396-7

Quality Control

Our Direct Brown 44 is manufactured under a stringent quality management system to ensure batch-to-batch consistency and performance. The product is tested against key parameters including color strength, shade, solubility, and impurity profile. A Certificate of Analysis (COA) detailing purity, physical properties, and conformance to specification is provided with each shipment to support your quality assurance protocols.

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.

Specification

Item	Specification
Appearance	Brown to dark brown powder
Identification (IR)	Conforms to standard
Color Strength	100 ± 3% (vs. Standard)
Moisture Content	≤ 5.0%
Water Insoluble Matter	≤ 1.0%
pH (1% Solution)	6.0 - 8.0
Heavy Metals (as Pb)	≤ 20 ppm

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