Description

C.I. Acid Black 138 is a high-performance, synthetic azo dye widely used for its deep, durable black shade. This product is valued for its excellent fastness properties, including strong resistance to washing and light, ensuring long-lasting color integrity in demanding applications. It is primarily utilized by manufacturers in the textile and leather industries for dyeing protein fibers such as wool, silk, and nylon, as well as for leather finishing. Our supply of C.I. Acid Black 138 CAS NO 12219-03-3 is backed by stringent quality control to meet the precise requirements of industrial dyeing processes.

Application

• Dyeing of wool and wool-blend textiles for apparel and carpets.
• Coloration of silk fabrics and garments.
• Dyeing of nylon fibers used in hosiery, sportswear, and upholstery.
• Leather finishing for footwear, bags, and automotive interiors.
• Specialty applications in dyeing feathers and other protein-based materials.
• Used in combination with other acid dyes to achieve complex, deep shades.

Basic Information

Product Name	C.I. Acid Black 138
CAS No.	12219-03-3
Molecular Formula	C22H14N6Na2O9S2
Molecular Weight	616.49 g/mol
Synonyms	Acid Black 138; C.I. 30035; Acid Leather Black NB; Acid Black NB; Acid Black WNB; Black WNB; Acid Black 2B; Acid Black M-B; Acid Black S-BL
EINECS	Contact for details

Quality Control

Our C.I. Acid Black 138 is manufactured under a strict quality management system. Every batch undergoes comprehensive analytical testing to ensure consistent shade, strength, and purity. Key parameters such as dye content, solubility, and fastness properties are verified against established standards. Certificates of Analysis (COA) documenting these results 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.

Specification

Item	Specification
Appearance	Black powder or granules
Identification (IR)	Conforms to standard
Assay (Dye Content)	≥ 95%
Moisture Content	≤ 5.0%
Water Insoluble Matter	≤ 1.0%
Shade	Conforms to standard sample
Fastness to Washing	≥ 4-5 (ISO 105-C03)
Fastness to Light	≥ 5 (ISO 105-B02)

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