Description

Acid Black 140 is a high-performance, synthetic acid dye belonging to the azo chemical class, widely recognized for its excellent dyeing properties. It is valued for its strong color yield, good leveling characteristics, and reliable fastness properties on protein fibers like wool, silk, and polyamide. This dye is essential for manufacturers in the textile and leather industries seeking to produce deep, rich black shades with consistent quality. The compound is also identified by the CAS registry number 12219-04-4.

Application

• Primary dyeing and printing of wool and silk textiles.
• Coloration of nylon (polyamide) fibers and fabrics.
• Leather dyeing for products such as apparel, upholstery, and accessories.
• Used in the production of inks for specialized printing applications.
• Potential use in coloring paper and other specialty substrates.
• Blending with other acid dyes to achieve specific shade formulations.

Basic Information

Product Name	Acid Black 140
CAS No.	12219-04-4
Molecular Formula	C40H23N7Na4O13S4
Molecular Weight	1083.86 g/mol
Synonyms	Acid Black 140; C.I. Acid Black 140; Lanasyn Black S-BL; Telon Black BRL; Nylosan Black N-BL; Acid Leather Black BRL; Acid Black BRL; 2,7-Naphthalenedisulfonic acid, 5-[[4-[[2-(acetyloxy)ethyl][4-[(2,4-disulfophenyl)azo]phenyl]amino]phenyl]azo]-4-hydroxy-3-[(4-nitrophenyl)azo]-, sodium salt (1:4)
EINECS	Contact for details

Quality Control

Our Acid Black 140 is manufactured under a stringent quality management system to ensure batch-to-batch consistency and performance. Each lot is tested against key parameters including color strength, shade, solubility, and fastness properties. Certificates of Analysis (COA) detailing purity, heavy metal content, and other critical specifications are available upon request to support your quality assurance protocols.

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 containers are sealed after each use to prevent moisture absorption and caking.

Specification

Item	Specification
Appearance	Black powder or granules
Identification (IR)	Conforms to standard
Color Strength	100 ± 3% (vs. Standard)
Moisture Content	≤ 5.0%
Water Insoluble Matter	≤ 1.0%
pH (1% Solution)	6.0 - 8.0
Heavy Metals (as Pb)	≤ 50 ppm
Fastness Properties	Contact for details

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