Description

Acid Brown 58 is a synthetic acid dye belonging to the azo chemical class, valued for its strong affinity to protein-based substrates like wool, silk, and nylon. Its primary commercial value lies in providing consistent, wash-fast brown shades with good leveling properties in textile dyeing applications. This dye is essential for manufacturers in the textile, leather, and paper industries seeking reliable coloration for natural and synthetic polyamide fibers.

Application

• Textile Dyeing: Primary application for dyeing wool, silk, and nylon fibers to achieve durable brown hues.
• Leather Coloring: Used in the tanning industry for dyeing leather goods, providing uniform color penetration.
• Paper Staining: Employed for coloring specialty papers, including decorative and packaging materials.
• Ink Formulation: A component in the manufacture of inks for various industrial printing applications.
• Biomolecule Staining: Potential use in laboratory settings for histological staining of proteinaceous tissues.

Basic Information

Product Name	Acid Brown 58
CAS No.	12269-87-3
Molecular Formula	C22H14N6Na2O9S2
Molecular Weight	624.49 g/mol
Synonyms	Acid Brown G; C.I. Acid Brown 58; Acid Leather Brown G; Lanasyn Brown G; Nylosan Brown E-R; Telon Brown G; Acid Fast Brown G; 2,7-Naphthalenedisulfonic acid, 4-amino-5-hydroxy-3-[(4-nitrophenyl)azo]-6-(phenylazo)-, disodium salt
EINECS	235-536-8

Quality Control

Our Acid Brown 58 is manufactured under a strict quality management system. Every batch undergoes comprehensive analytical testing to ensure it meets precise color strength, solubility, and shade consistency specifications. A Certificate of Analysis (COA) detailing purity, heavy metal content, and other critical parameters is provided with each shipment to guarantee compliance with your application requirements.

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 or granules
Identification (IR)	Conforms to standard
Assay (Color Strength)	≥ 98%
Moisture Content	≤ 5.0%
Water Solubility	Conforms
pH (1% Solution)	6.0 - 8.0
Heavy Metals (as Pb)	≤ 20 ppm
Ash Content	≤ 1.0%

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