Solvent Yellow 56

Solvent Yellow 56 belongs to the disazo solvent dye family. It appears as a golden yellow powder with a melting point range of 210-215°C, demonstrating superior thermal stability compared to common solvent yellows—no significant decomposition occurs when heated below 180°C. In terms of solubility, it is practically insoluble in water (solubility < 0.05 g/L at 25°C) but exhibits excellent solubility in polar organic solvents such as N,N-dimethylacetamide (DMAC), cyclohexanone, and ethylene glycol monobutyl ether, forming a transparent golden yellow solution.

What are the unique characteristics and advantages of Solvent Yellow 56?

Compared with similar solvent dyes (e.g., Solvent Yellow 14, Solvent Yellow 33), Solvent Yellow 56 has four prominent advantages: 

• exceptional light fastness. When applied to automotive coatings, its light fastness reaches grade 5-6 (per ISO 105-B02:2014), which is 2-3 grades higher than Solvent Yellow 14, making it suitable for outdoor products (source: Dyes and Pigments, 2024, Vol. 225). 
• strong weather resistance. After 1000 hours of xenon lamp aging test (per ISO 11341:2023), the color difference (ΔE*ab) is less than 1.2, far lower than the industry threshold of 3.0, ensuring long-term color stability in harsh environments. 
• excellent compatibility with high-performance resins. It can be uniformly dispersed in polyamide (PA), polyurethane (PU), and polyimide (PI) resins without causing resin degradation or performance loss (source: "Solvent Dyes for Advanced Materials", Chemical Industry Press, 2022). 
• good chemical resistance. It remains color-stable in contact with weak acids (pH 4-6), weak alkalis (pH 8-10), and common industrial solvents (gasoline, diesel), avoiding discoloration or fading caused by chemical erosion.‍

TRADE NAME:

Transparence Yellow 5R,Somke Yellow 56,Permalex Yellow 56,Transparence Yellow 5R,Sudan M Yellow150

Specific application fields of Solvent Yellow 56

Benefiting from its high performance, Solvent Yellow 56 is widely used in high-end industrial fields that demand strict color stability. Its main application scenarios include:

• ‍Automotive and transportation coatings: Used in solvent-based automotive refinishing paints, motorcycle body coatings, and train interior trim coatings to provide bright golden yellow tones, especially for parts requiring outdoor durability.
• Engineering plastics coloring: Applied to PA, PU, and PI engineering plastics for manufacturing automotive parts (such as connector housings), electronic components, and industrial machinery parts, where it maintains color stability under high temperature and mechanical stress.
• High-end ink manufacturing: Used in gravure inks for packaging of high-end consumer goods (such as cosmetics, luxury goods) and screen printing inks for metal substrates, ensuring clear patterns and non-fading colors.
• Coil coatings and architectural coatings: Utilized in coil coatings for aluminum and steel plates (used in building exteriors, home appliances) and architectural exterior wall coatings, withstanding UV radiation and rain erosion.
• Specialty applications: Also used in the coloring of heat-resistant lubricating oils, high-temperature resistant waxes, and aerospace-grade sealants.‍

Technical Specifications

• ‍CAS NO: 2481-94-9
• CI.NO: 11021
• Chemical Family: Monoazo series
• Molecular Formula: C16H19N3
• Molecular Weight: 253.34
• Shade: deep reddish yellow‍

Package

20 or 25kg/compound bag, carton box, iron drum, fiber durm for powder dye and 1000kg/tank for liquid dye.