Description

Acid Brown 188 is a synthetic azo dye belonging to the acid dye class, known for its excellent affinity for protein fibers like wool, silk, and nylon. Its primary value lies in providing durable, wash-fast brown shades with good leveling properties and lightfastness, making it a reliable choice for consistent coloration. This dye is essential for manufacturers in the textile, leather, and paper industries seeking high-performance colorants for their products. Acid Brown 188 CAS NO 12219-57-7 is also utilized in specialized applications such as the staining of biological tissues and certain food colorants where permitted.

Application

• Textile Dyeing: Primary application for dyeing wool, silk, and nylon fibers to achieve a range of brown hues.
• Leather Finishing: Used for coloring leather goods, providing rich and uniform brown tones.
• Paper Coloring: Employed in the production of specialty papers, including decorative and packaging materials.
• Biological Staining: Serves as a histological stain in laboratory settings for microscopic analysis.
• Food Colorant (where approved): Potential use as a food dye in specific jurisdictions under strict regulatory guidelines.
• Ink Formulation: A component in the manufacture of inks for various printing applications.

Basic Information

Product Name	Acid Brown 188
CAS No.	12219-57-7
Molecular Formula	C32H24N8Na4O16S4
Molecular Weight	984.80 g/mol
Synonyms	Acid Brown G; C.I. Acid Brown 188; Acid Leather Brown G; Lanasyn Brown S-GL; Supranol Fast Brown GW; Telon Fast Brown GNW; Acid Fast Brown G; 2,7-Naphthalenedisulfonic acid, 5-[[4-[[2,5-bis[(4-sulfophenyl)azo]phenyl]azo]-1-naphthalenyl]azo]-, tetrasodium salt
EINECS	Contact for details

Quality Control

Our Acid Brown 188 is manufactured under a stringent quality management system to ensure batch-to-batch consistency and performance. Each lot undergoes comprehensive testing, including spectrophotometric analysis for strength and shade, purity assessment via HPLC, and checks for insolubles and heavy metal content. A Certificate of Analysis (COA) detailing all specifications is provided with every shipment to guarantee compliance with your technical 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 and incompatible materials. The product is hygroscopic (moisture-sensitive); ensure the container is sealed after each use to prevent moisture absorption.

Specification

Item	Specification
Appearance	Brown to dark brown powder
Identification (IR)	Conforms to standard
Assay (Color Strength)	≥ 95%
Moisture Content	≤ 5.0%
Water Insoluble Matter	≤ 1.0%
Shade	Within agreed tolerance
Heavy Metals (as Pb)	≤ 50 ppm
Solubility (in Water)	Clear solution

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