Description

Acid Brown 348 is a synthetic organic dye belonging to the acid dye class, identified by CAS NO 72827-72-6. This high-performance colorant is valued for its strong affinity for protein fibers like wool, silk, and nylon, delivering excellent wash and light fastness properties. It is primarily utilized by manufacturers in the textile, leather, and paper industries seeking durable and vibrant brown shades for their products.

Application

• Textile Dyeing: Primary application for dyeing wool, silk, and polyamide (nylon) fibers to achieve rich, long-lasting brown hues.
• Leather Finishing: Used in the coloration of leather goods, providing uniform and deep color penetration.
• Paper Staining: Employed in the production of specialty papers, including decorative and packaging materials.
• Ink Formulation: A component in the manufacture of inks for various industrial printing applications.
• Biomaterial Staining: Potential use in laboratory settings for histological staining of protein-based biological samples.

Basic Information

Product Name	Acid Brown 348
CAS No.	72827-72-6
Molecular Formula	C32H21N5Na4O16S4
Molecular Weight	1003.8 g/mol
Synonyms	Acid Brown 348; C.I. Acid Brown 348; Acid Leather Brown PR; Nylosan Brown E-RL; Telon Brown K-3RL; Acid Fast Brown RL; Brown 348; 2,7-Naphthalenedisulfonic acid, 5-[[4-[[2-(aminosulfonyl)-4-nitrophenyl]azo]-1-naphthalenyl]azo]-3-[[4-[[2-(aminosulfonyl)-4-nitrophenyl]azo]-1-naphthalenyl]azo]-4-hydroxy-, tetrasodium salt
EINECS	Contact for details

Quality Control

Our Acid Brown 348 is manufactured under a stringent quality management system. Every batch is tested to ensure consistent strength, shade, and chemical purity, meeting the high standards required for industrial dyeing processes. A comprehensive Certificate of Analysis (COA) detailing parameters such as purity, solubility, and heavy metal content is provided with each shipment to guarantee supply reliability and product consistency.

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). Due to its hygroscopic (moisture-sensitive) nature, the container must be kept tightly sealed when not in use to prevent absorption of atmospheric moisture, which can affect product performance.

Specification

Item	Specification
Appearance	Brown powder
Identification (IR)	Conforms
Assay (HPLC)	≥ 95%
Moisture Content	≤ 5.0%
Water Solubility	Conforms
Shade & Strength	Matches standard
Heavy Metals (as Pb)	≤ 50 ppm

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