Description

Acid Brown 237 is a synthetic acid dye belonging to the azo dye class, identified by CAS NO 71872-21-4. It is valued for its excellent color fastness, solubility, and strong affinity for protein-based and polyamide fibers. This dye is primarily used by manufacturers in the textile and leather industries seeking consistent, high-quality brown shades for their products.

Application

• Textile Dyeing: Primary application for dyeing wool, silk, and nylon fibers to achieve durable brown hues.
• Leather Finishing: Used in the coloration of leather goods, providing uniform and vibrant brown tones.
• Paper Staining: Employed in specialty paper production for tinting and decorative purposes.
• Ink Formulation: A component in the manufacture of inks for various industrial printing applications.
• Biological Staining: Potential use as a histological stain in laboratory settings (subject to specific grade purity).

Basic Information

Product Name	Acid Brown 237
CAS No.	71872-21-4
Molecular Formula	Contact for details
Molecular Weight	Contact for details
Synonyms	Acid Brown 237; C.I. Acid Brown 237; Acid Leather Brown 237; Brown 237; Acid Fast Brown 237; Azo Brown 237; Acid Dye Brown 237
EINECS	Contact for details

Quality Control

Our Acid Brown 237 is produced under a stringent quality management system. Each batch undergoes rigorous testing to ensure it meets consistent standards for color strength, solubility, and impurity profiles. Certificates of Analysis (COA) detailing purity, heavy metal content, and other critical parameters are available upon request.

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 Powder
Identification (IR)	Conforms
Assay (HPLC)	≥ 95%
Moisture Content	≤ 5.0%
Water Insoluble Matter	≤ 1.0%
Heavy Metals (as Pb)	≤ 50 ppm
Solubility (in Water)	Conforms

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