Description

Solvent Yellow 21 is a synthetic organic dye belonging to the azo class, widely recognized for its vibrant yellow hue and excellent solubility in non-polar to moderately polar organic media. This compound is valued for its strong tinctorial strength and good lightfastness, making it a reliable colorant for industrial applications. It is primarily utilized by manufacturers in the plastics, printing ink, and coatings industries seeking consistent and durable coloration.

Application

• Primary colorant for plastics and synthetic resins, including polystyrene, ABS, and polycarbonate.
• Manufacturing of printing inks, particularly for packaging and publication gravure inks.
• Coloration of industrial coatings, lacquers, and wood stains.
• Dye for waxes, greases, and petroleum products for identification purposes.
• Coloring agent for specialty office supplies and stationery.
• Potential use as a microscopic stain in specific biological or industrial research applications.

Basic Information

Product Name	Solvent Yellow 21
CAS No.	41579-63-9
Molecular Formula	C16H14N4O
Molecular Weight	278.31 g/mol
Synonyms	1-[[4-(Phenylazo)phenyl]azo]-2-naphthol; C.I. Solvent Yellow 21; Oil Yellow 2G; Aizen SOT Yellow 1; Ceres Yellow GN; Sudan Yellow G; Plast Yellow 8610; Waxoline Yellow 2GP
EINECS	255-426-4

Quality Control

Our Solvent Yellow 21 is manufactured under a strict quality management system. Each batch is tested to ensure consistent color strength, purity, and performance characteristics. We provide comprehensive Certificates of Analysis (COA) detailing key parameters such as purity, hue, and solubility. Our production adheres to relevant industry standards, and we can support compliance documentation for global supply chains.

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 heat sources and incompatible materials. Due to its light-sensitive nature, prolonged exposure to direct light should be avoided to maintain product integrity.

Specification

Item	Specification
Appearance	Yellow to orange powder or granules
Identification (IR)	Conforms to standard
Assay (HPLC)	≥ 98.0%
Color Strength	100 ± 5% (vs. Standard)
Moisture Content	≤ 1.0%
Ash Content	≤ 0.5%
Solubility (in Toluene)	Complete, clear solution

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