Description

C.I.Acid Black 157 is a high-performance, synthetic acid dye belonging to the azo chemical class. It is valued for its ability to produce deep, intense black shades with excellent colorfastness properties on protein-based fibers like wool, silk, and nylon. This dye is essential for manufacturers in the textile and leather industries seeking durable, high-quality coloration. Its consistent performance makes it a reliable choice for industrial dyeing and printing processes.

Application

• Textile Dyeing: Primary application for dyeing wool, silk, and nylon fibers to achieve deep black shades.
• Leather Processing: Used in the dyeing of leather goods, providing rich color and good penetration.
• Paper Coloration: Employed for specialty paper products requiring a stable black colorant.
• Ink Formulation: A component in the manufacture of certain inks for industrial marking or printing.
• Biomaterial Staining: Potential use in laboratory settings for staining specific biological tissues or materials.

Basic Information

Product Name	C.I.Acid Black 157
CAS No.	12234-54-7
Molecular Formula	C32H21N5Na2O8S2
Molecular Weight	713.64 g/mol
Synonyms	Acid Black 157; C.I. 15705; Acid Leather Black NB; Acid Black NB; Acid Black NBL; Acid Black NB-LL; Acid Black NB-L; Acid Black NB-LF; Acid Black NB-LS
EINECS	Contact for details

Quality Control

Our production of C.I.Acid Black 157 adheres to stringent quality management protocols to ensure batch-to-batch consistency and purity. Every lot is tested against established specifications for critical parameters including color strength, shade, solubility, and impurity profiles. Certificates of Analysis (COA) documenting these results are available upon request to support your quality assurance and regulatory needs.

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	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
Shade	Conforms to standard

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