Description

C.I. Acid Brown 345 is a synthetic azo dye belonging to the acid dye class, widely recognized for its brown hue and excellent affinity for protein fibers. This product matters for its reliable performance in demanding dyeing applications, offering good light and wash fastness properties. It is primarily needed by the textile and leather industries for coloring wool, silk, nylon, and leather goods, where consistent color depth and quality are critical for commercial success.

Application

• Primary dyeing of wool and silk fabrics and yarns.
• Coloration of nylon fibers in textile manufacturing.
• Staining and finishing of leather goods, including apparel, upholstery, and accessories.
• Used in the production of colored paper and specialty papers.
• Potential application in the dyeing of furs and other protein-based materials.
• Formulation of ink and toner for specific printing applications.

Basic Information

Product Name	C.I. Acid Brown 345
CAS No.	70620-32-5
Molecular Formula	Contact for details
Molecular Weight	Contact for details
Synonyms	Acid Brown 345; C.I. 20245; Acid Leather Brown 2GL; Acid Brown GL; Nylosan Brown E-RL; Telon Brown K-3GL; Supranol Brown RL; Erionyl Brown R-L; Amido Brown L-R
EINECS	Contact for details

Quality Control

Our C.I. Acid Brown 345 is manufactured under a strict quality management system. Every batch undergoes rigorous testing for key parameters including color strength, shade, solubility, and fastness properties to ensure it meets consistent performance standards for industrial dyeing. Certificates of Analysis (COA) detailing batch-specific results are available upon request.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated place at room temperature (15-25°C). Due to its hygroscopic (moisture-sensitive) nature, the container must be kept tightly sealed when not in use to prevent moisture absorption and caking.

Specification

Item	Specification
Appearance	Brown Powder
Color Strength	Standard Depth ± 3%
Shade	Conforms to Standard
Moisture Content	≤ 5.0%
Water Solubility	Conforms
Fastness to Light	≥ 4-5 (Standard)
Fastness to Washing	≥ 4 (Standard)
Particle Size	≥ 95% through 80 mesh

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