Description

Durazol Brown 4Rns is a synthetic azo dye belonging to the class of direct dyes, identified by CAS No. 6661-42-3. It is valued for its strong affinity to cellulosic fibers, providing excellent wash and light fastness properties for deep, uniform coloration. This product is essential for manufacturers in the textile and leather industries seeking reliable and vibrant brown shades for their dyeing and printing processes.

Application

• Primary dyeing of cotton, viscose, and other cellulosic fibers.
• Printing applications on cellulosic fabrics and blends.
• Leather dyeing for footwear, upholstery, and accessories.
• Coloration of paper and paperboard products.
• Tinting of wood and related natural materials.
• As a colorant in the manufacture of specialty inks.

Basic Information

Product Name	Durazol Brown 4Rns
CAS No.	6661-42-3
Molecular Formula	C32H20N6Na4O14S4
Molecular Weight	992.78 g/mol
Synonyms	Direct Brown 4RNS; C.I. Direct Brown 4; Direct Brown 4R; Durazol Brown R; Pontamine Brown 4R; Direct Fast Brown 4R; Benzo Brown 4R; Aizen Direct Brown 4RH; Atul Direct Brown 4R; Direct Brown 4R (C.I. 30110); 1,3-Benzenedisulfonic acid, 4,4'-[(2,4-dihydroxy-5-methyl-1,3-phenylene)bis(azo)]bis[6-amino-5-hydroxy-, tetrasodium salt
EINECS	229-687-9

Quality Control

Our Durazol Brown 4Rns is manufactured under a strict quality management system. Every batch undergoes comprehensive analytical testing to ensure consistency in strength, shade, and solubility. A Certificate of Analysis (COA) detailing purity, physical properties, and performance characteristics is provided with each shipment to guarantee it meets your specific application 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.

Specification

Item	Specification
Appearance	Brown to dark brown powder
Identification (IR)	Conforms to standard
Assay (Color Strength)	≥ 98%
Moisture Content	≤ 5.0%
Water Insoluble Matter	≤ 1.0%
Shade	Conforms to standard sample
Solubility in Water	Complete
pH (1% Solution)	6.0 - 8.0

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