Description

Basic Yellow 21 is a synthetic cationic dye belonging to the azo and methine chemical classes, identified by CAS No. 6359-50-8. It is valued for its strong affinity to polyacrylonitrile and other synthetic fibers, providing excellent color fastness and brightness. This product is essential for manufacturers in the textile, paper, and leather industries seeking reliable and vibrant yellow coloration.

Application

• Textile Dyeing: Primary application for dyeing acrylic, modacrylic, and polyamide fibers, offering good leveling and migration properties.
• Paper Coloring: Used in the production of colored papers, tissues, and specialty paper products.
• Leather Finishing: Imparts a uniform and durable yellow color to leather goods.
• Ink Formulation: A colorant component for certain types of inks, including stamp pad and flexographic inks.
• Biological Staining: Employed in histology and cytology as a staining agent for microscopic analysis.
• Plastics and Polymers: Used for mass coloration of certain plastics where compatibility is suitable.

Basic Information

Product Name	Basic Yellow 21
CAS No.	6359-50-8
Molecular Formula	C21H29N3O3S
Molecular Weight	403.54 g/mol
Synonyms	Basic Yellow 21; C.I. 48054; Aizen Cathilon Yellow 5GLH; Astrazon Yellow 5GL; Maxilon Yellow 5GL; Sevron Yellow L; Sandocryl Yellow B-6GL; Cationic Yellow 51
EINECS	228-782-5

Quality Control

Our Basic Yellow 21 is manufactured under a strict quality management system. Each batch is tested to ensure it meets precise color strength, shade, and chemical purity specifications. A comprehensive Certificate of Analysis (COA) detailing assay, impurity profile, and physical properties is provided with every shipment to guarantee consistency and compliance 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). Keep away from incompatible materials. Due to its light-sensitive nature, prolonged exposure to direct light should be avoided to prevent degradation.

Specification

Item	Specification
Appearance	Yellow to orange-brown powder
Identification (IR)	Conforms to standard
Color Strength	100% ± 3% (vs. Standard)
Assay (HPLC)	≥ 95.0%
Moisture Content	≤ 5.0%
Ash Content	≤ 1.0%
Water Solubility	Clear solution at 1%
Shade	Within agreed tolerance

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