Description

Acid Brown 48 is a synthetic acid dye belonging to the azo dye class, identified by CAS NO 61724-06-9. It is valued for its ability to provide consistent, durable brown shades with good light and wash fastness properties on protein-based fibers. This dye is primarily utilized in the textile industry for dyeing wool, silk, and nylon, as well as in the leather tanning and paper coloring sectors.

Application

• Primary dyeing of wool and silk fabrics and yarns.
• Coloration of nylon fibers and textiles.
• Leather finishing and dyeing for upholstery, footwear, and accessories.
• Pulp and paper coloring for specialty papers.
• Manufacture of inks and toners.
• As a colorant for wood stains and coatings.
• Research and development in dye chemistry and material science.

Basic Information

Product Name	Acid Brown 48
CAS No.	61724-06-9
Molecular Formula	C22H14N6Na2O9S2
Molecular Weight	624.49 g/mol
Synonyms	Acid Leather Brown D; Acid Brown D; C.I. Acid Brown 48; Acid Fast Brown D; Lanasyn Brown S-RBL; Supranol Fast Brown RBL; Telon Fast Brown RBL; Nylosan Brown N-5RBL; Acid Brown 48 (C.I. 65005)
EINECS	Contact for details

Quality Control

Our Acid Brown 48 is manufactured under a strict quality management system. Every batch undergoes comprehensive analytical testing to ensure consistent shade, strength, and purity, meeting the specifications required for industrial dyeing applications. A Certificate of Analysis (COA) detailing key parameters such as color strength, solubility, and impurity profile 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). This product 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 powder or granules
Identification (IR)	Conforms to standard
Color Strength	100 ± 3% (vs. Standard)
Moisture Content	≤ 5.0%
Water Solubility	Conforms
Ash Content	≤ 1.0%
pH (1% Solution)	6.0 - 8.0
Heavy Metals (as Pb)	≤ 50 ppm

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