Description

Acid Brown 239 is a high-performance, water-soluble azo dye belonging to the acid dye class, widely recognized for its excellent color fastness and dyeing properties. Its primary value lies in providing a durable and vibrant brown coloration to protein-based fibers, particularly wool, silk, and nylon, with strong affinity and level dyeing characteristics. This dye is essential for manufacturers in the textile and leather industries seeking consistent, high-quality brown shades for apparel, upholstery, and specialty fabrics. Acid Brown 239 CAS NO 61724-21-8 is also utilized in the coloration of paper and in certain ink formulations where its stability is advantageous.

Application

• Textile Dyeing: Primary application for dyeing wool, silk, and polyamide (nylon) fibers to achieve a range of brown shades with good wash and light fastness.
• Leather Finishing: Used in the dyeing of leather goods, including footwear, bags, and garments, providing rich and uniform color penetration.
• Paper Coloration: Employed in the production of specialty colored papers, including packaging and decorative papers.
• Ink Formulations: Suitable for use in certain types of inks where its solubility and color properties are required.
• Biomedical Staining: Potential use as a biological stain in laboratory settings for histological applications, though specific grades must be verified.

Basic Information

Product Name	Acid Brown 239
CAS No.	61724-21-8
Molecular Formula	C32H21N5Na2O8S2
Molecular Weight	721.65 g/mol
Synonyms	Acid Brown 239; C.I. Acid Brown 239; Acid Leather Brown D; Acid Fast Brown BRL; Brown 239; Lanasyn Brown S-RBL; Telon Brown K-3R; Supranol Fast Brown BRL; Nylosan Brown E-RBL; Acidol Brown M-BRL
EINECS	Contact for details

Quality Control

Our Acid Brown 239 is manufactured under a stringent quality management system to ensure batch-to-batch consistency and performance. Each lot is tested against key parameters including color strength, shade, solubility, and impurity profile to meet the demanding standards of the textile and leather industries. While produced to industrial-grade specifications, we can discuss custom purity requirements. A comprehensive Certificate of Analysis (COA) detailing assay, physical properties, and performance tests is provided with every 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 strong oxidizing agents. The product is hygroscopic (moisture-sensitive); ensure the container is sealed after each use to prevent moisture absorption and caking.

Specification

Item	Specification
Appearance	Brown powder or granules
Identification (IR)	Conforms to standard
Assay (Color Strength)	≥ 98%
Moisture Content	≤ 5.0%
Water Solubility	Clear solution at 1%
pH (1% Solution)	6.0 - 8.0
Ash Content	≤ 1.0%
Heavy Metals (as Pb)	≤ 50 ppm

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