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High-solids, solvent-borne unsaturated polyester resin designed for excellent gloss and surface hardness.
Optimized reactivity for balanced gel time and cure speed in ambient- or low-temperature curing systems.
Superior compatibility with common reactive diluents (e.g., styrene) and standard peroxide initiators.
Delivers outstanding chemical resistance and mechanical durability in cured thermoset coatings and laminates.
Consistent batch-to-batch performance with stringent quality control per ISO 9001 manufacturing standards.
Industrial maintenance coatings for metal substrates requiring corrosion protection.
Marine topcoats and gel coats for fiberglass-reinforced plastic (FRP) components.
Automotive under-hood and underbody protective coatings.
Architectural pre-finished metal (PPM) coil and sheet coatings.
High-performance repair mortars and polymer concretes.
| Chemical Type | Unsaturated polyester resin |
| Product Form | Liquid, solvent-borne |
| Appearance | Clear to pale yellow viscous liquid |
| Primary Applications | Coatings, gel coats, laminating resins |
| Key Features | High solids, fast cure, excellent hardness development |
| Benefits | Reduced VOC emissions vs. conventional low-solids resins; improved productivity through shorter cure cycles |
| Storage Stability | At least 6 months at 20–25 °C in sealed original container |
| Recommended Initiator | Methyl ethyl ketone peroxide (MEKP), 0.8–1.5 wt% based on resin + diluent |
Q1: What is the primary function of ROSKYDAL 550 in polyester-based coating systems?
A: ROSKYDAL 550 is a reactive diluent and viscosity modifier specifically designed for unsaturated polyester resins. It reduces system viscosity without sacrificing reactivity or final film performance, enabling improved processability during application while supporting good cure response and mechanical properties.
Q2: Is ROSKYDAL 550 compatible with standard peroxide initiators used in polyester curing?
A: Yes, ROSKYDAL 550 is fully compatible with common organic peroxides such as MEKP (methyl ethyl ketone peroxide) and BPO (benzoyl peroxide), and does not interfere with typical free-radical polymerization kinetics under standard processing conditions.
Q3: How does ROSKYDAL 550 compare to styrene in terms of volatility and handling safety?
A: ROSKYDAL 550 exhibits significantly lower volatility and higher flash point than styrene, resulting in reduced VOC emissions and improved workplace safety during handling and storage. Its higher molecular weight also contributes to lower evaporation rates and better formulation stability.
Q4: Can ROSKYDAL 550 be used in high-solids or low-VOC polyester formulations?
A: Yes, it is widely employed in high-solids and low-VOC unsaturated polyester systems due to its low vapor pressure and ability to replace higher-VOC monomers like styrene — helping formulators meet increasingly stringent environmental and regulatory expectations without compromising performance.
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E-mail: wangxingqiang@ericwchem.com
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Building A1, Jiete Industrial Park, Huangpu District, Guangzhou City, Guangdong Province, China
