Description

Direct Brown 101 is a synthetic azo dye belonging to the direct dye class, valued for its strong affinity to cellulosic fibers without the need for a mordant. Its primary value lies in providing a cost-effective and durable brown coloration with good wash and light fastness properties. This dye is essential for manufacturers in the textile industry, particularly for dyeing cotton, viscose, and paper products where consistent shade and batch-to-batch reproducibility are critical.

Application

• Primary dyeing of cotton fabrics and yarns.
• Coloration of regenerated cellulose fibers such as viscose and rayon.
• Dyeing of paper and paperboard for packaging and specialty papers.
• Used in the leather industry for dyeing leather goods.
• Potential use in the coloration of wood and other natural cellulosic materials.
• Employed in educational and research laboratories for dye chemistry studies.

Basic Information

Product Name	Direct Brown 101
CAS No.	3626-29-7
Molecular Formula	C32H20N6Na4O13S4
Molecular Weight	956.78 g/mol
Synonyms	Direct Brown 101; Direct Brown M; C.I. Direct Brown 101; Direct Fast Brown M; Direct Brown MR; Direct Brown 101 (C.I. 31740); Benzo Brown MR; Pontamine Brown MR
EINECS	222-849-8

Quality Control

Our Direct Brown 101 is produced under a stringent quality management system to ensure it meets the high standards required for industrial dyeing applications. Every batch is tested for critical parameters including color strength, shade, solubility, and impurity content to guarantee consistent performance and reproducibility. A comprehensive Certificate of Analysis (COA) detailing purity, physical properties, and conformance to specification is provided with each shipment.

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. Due to its light-sensitive nature, prolonged exposure to direct light should be avoided to prevent degradation.

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%
Shade	Conforms to standard
Solubility in Water	Conforms

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