Solvent Yellow 21 (CAS No.: 5601-29-6), a 2:1 chromium complex azo dye, is widely recognized for its stable greenish-yellow hue and adaptability in multiple industrial fields.
TRADE NAME:
Zapon Fast Yellow R,Oil Yellow 2G,Filamid Yellow R,Zapon Yellow 156
Characteristics and advantages of Solvent Yellow 21
Solvent Yellow 21 exhibits four distinct advantages that make it competitive in the solvent dye market:
- Distinct and consistent hue: It presents as a deep yellow powder with a typical greenish shade, which is highly sought after in decorative and functional coloring. Its tinting strength remains stable within the range of 100-105%, ensuring uniform color effects in batch production.
- Reliable fastness performance: The dye demonstrates excellent resistance to environmental factors—light fastness reaches 5-6 grade, acid and alkali resistance at 4 grade, and water resistance at 5 grade. This ensures minimal color fading even in humid or slightly corrosive environments.
- Suitable thermal stability: With a minimum heat resistance of 180°C, it can withstand the processing temperatures of most conventional coatings and general plastics, avoiding thermal decomposition or color distortion during application.
- Good solvent compatibility: It dissolves well in common organic solvents (e.g., xylene, ethyl acetate) and has low water solubility (≤1.0%), making it perfectly suited for solvent-based systems without precipitation issues.
Primary Advantages
- Bright, vivid yellow shade that improves product appeal
- Reliable performance in inks, coatings, and certain plastics
- Technical support for formulation and color matching
- Available in sample sizes for testing and scale-up
The specific application areas of Solvent Yellow 21
Leveraging its comprehensive performance, Solvent Yellow 21 has been widely applied in five major fields, as documented in industrial application data :
- Coatings industry: Primarily used in wood coatings (furniture lacquers, floor paints) and industrial paints, providing bright decorative colors for solid wood furniture and metal surfaces.
- Printing inks: Applied in solvent-based gravure and flexographic inks for packaging printing (e.g., food boxes, cosmetic containers) and label printing, thanks to its stable color and good printability.
- Plastic coloring: Suitable for coloring general plastics such as PP (polypropylene) and PE (polyethylene) used in daily necessities like combs, stationery, and plastic containers.
- Leather and metal processing: Utilized in solvent-based dyeing of leather products (shoes, bags) and surface coloring of metal components, enhancing the aesthetic value of the products.
- Specialty materials: Also used in coloring gliding materials, expanding its application scope beyond traditional industries .
Technical Specifications
- CAS NO: 5601-29-6
- CI.NO: 18690
- Chemical Family: Monoazo series, Metal Complex
- Molecular Formula: C17H14N4O3
- Molecular Weight: 322.32
- Shade: bluish yellow powder
Density(g/cm3) | 1.23 |
Melting Point(°C) | 180 |
Light Fastness | 7.0 |
Heat resistance | 180 |
Alcohol | 100 |
1- methoxy-2-propanol | 300 |
N-propanol | 100 |
2- ethoxyethanol | 500 |
M.E.K | 500 |
Package
20 or 25kg/compound bag, carton box, iron drum, fiber durm for powder dye and 1000kg/tank for liquid dye.
Can Solvent Yellow 21 be used in water-based systems?
No — Solvent Yellow 21 is a solvent-soluble dye. It is not suitable for aqueous systems unless chemically modified or used with specific dispersing technologies. For water-based colorants, consider water-soluble dyes or pigment dispersions.
What concentration should I start with in inks?
Start with small lab-scale trials. Typical starting concentrations vary by system; many formulators start with 0.1–1.0% w/w on the total formulation and adjust based on color strength and performance.
Do you provide color matching services?
Yes — we offer technical support and color matching for commercial orders. Provide a sample or reference shade and we will propose a formulation or colorant concentration.
