Description

Acid Brown 425 is a synthetic acid dye belonging to the azo dye class, valued for its strong affinity to protein fibers like wool, silk, and nylon. Its primary value lies in providing excellent color fastness, particularly to washing and light, making it a reliable choice for demanding dyeing applications. This dye is essential for manufacturers in the textile, leather, and specialty paper industries seeking consistent, high-quality brown shades.

Application

• Textile Dyeing: Primary application for dyeing wool, silk, and nylon fibers and fabrics to achieve durable brown hues.
• Leather Finishing: Used in the coloring of leather goods, providing rich and even coloration with good penetration.
• Paper Staining: Employed in the production of specialty and decorative papers where color consistency is critical.
• Ink Formulation: A component in the manufacture of certain inks, particularly for non-impact printing or specialty markings.
• Biomaterial Staining: Potential use in laboratory settings for histological staining of protein-based biological samples.

Basic Information

Product Name	Acid Brown 425
CAS No.	119509-49-8
Molecular Formula	C32H24N8Na4O16S4
Molecular Weight	1048.88 g/mol
Synonyms	Acid Brown A-G; C.I. Acid Brown 425; Acid Leather Brown A-G; Sodium 4-hydroxy-3-[(2-hydroxy-1-naphthyl)azo]-5-[(4-sulfonato-1-naphthyl)azo]naphthalene-2,7-disulfonate; 2,7-Naphthalenedisulfonic acid, 4-hydroxy-3-((2-hydroxy-1-naphthalenyl)azo)-5-((4-sulfo-1-naphthalenyl)azo)-, sodium salt (1:4); Acid Brown AG
EINECS	Contact for details

Quality Control

Our production of Acid Brown 425 adheres to stringent quality control protocols 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 industry specifications. A comprehensive Certificate of Analysis (COA) detailing purity, physical properties, and performance metrics 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.

Specification

Item	Specification
Appearance	Brown powder or granules
Identification (IR)	Conforms to standard
Assay (Color Strength)	≥ 95%
Moisture Content	≤ 5.0%
Water Solubility	Freely soluble
pH (1% Solution)	6.0 - 8.0
Ash Content	≤ 30.0%
Heavy Metals (as Pb)	≤ 50 ppm

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