Description

Acid Black 231 is a high-performance, synthetic acid dye belonging to the azo chemical class. This dye is engineered to deliver exceptional color strength and fastness properties, making it a critical component for achieving deep, durable black shades. It is primarily utilized in the dyeing and printing of protein fibers such as wool, silk, and nylon, as well as in leather finishing. Industries requiring reliable and vibrant coloration for textiles, leather goods, and specialty materials will find this product meets rigorous performance standards.

Application

• Textile Dyeing: Primary application for dyeing wool, silk, and polyamide (nylon) fibers to achieve deep, level black shades with good wet fastness.
• Leather Processing: Used in the dyeing of leather for footwear, apparel, and upholstery, providing uniform penetration and color consistency.
• Paper Staining: Employed for the coloration of specialty papers where acid dye compatibility is required.
• Ink Formulation: A colorant component in the manufacture of certain inks for non-impact printing or specialty marking.
• Biomaterial Staining: Potential use in laboratory settings for histological staining of protein-based tissues.

Basic Information

Product Name	Acid Black 231
CAS No.	86857-01-4
Molecular Formula	C40H23N7Na4O19S6
Molecular Weight	1379.04 g/mol
Synonyms	Acid Black WAN; C.I. Acid Black 231; Black 231; Acid Leather Black 231; Acid Black 2B; Nylosan Black N-BL; Telon Black BGL; Aminyl Black F-BL; Supranol Black BRL; Acid Dye Black 231
EINECS	Contact for details

Quality Control

Our Acid Black 231 is manufactured under a strict quality management system. Each batch is analyzed to ensure it meets precise specifications for color strength, shade, solubility, and impurity profiles. We provide comprehensive Certificates of Analysis (COA) with key parameters including assay, heavy metal content, and fastness properties, ensuring consistency and reliability for your industrial processes.

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 nature, the container must be kept tightly sealed to prevent moisture absorption, which can affect product performance.

Specification

Item	Specification
Appearance	Black to Bluish-Black Powder
Identification (IR)	Conforms to Standard
Color Strength	100 ± 3% (Standard)
Moisture Content	≤ 5.0%
Water Insoluble Matter	≤ 1.0%
pH (1% Solution)	6.0 - 8.0
Shade	Conforms to Standard
Fastness Properties	Contact for details

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