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High-solids, low-viscosity unsaturated polyester resin for efficient processing and reduced VOC emissions.
Excellent compatibility with standard styrene monomers and common free-radical initiators.
Good mechanical strength and chemical resistance in cured laminates and castings.
Consistent reactivity profile enabling reliable gel time control in ambient and elevated temperature curing.
Optimized for high-gloss surface finish and minimal post-cure shrinkage in decorative and industrial applications.
Fiberglass-reinforced plastic (FRP) panels for architectural cladding and façade systems.
Cultured marble and solid surface countertop castings.
Industrial tanks and secondary containment liners requiring corrosion resistance.
Marine deck and hull components in small-to-midsize vessel manufacturing.
Lightweight composite enclosures for electrical and telecom infrastructure.
| Chemical Type | Unsaturated orthophthalic polyester resin |
| Product Form | Liquid |
| Appearance | Clear to pale yellow viscous liquid |
| Solids Content (wt%) | ≈ 99.5% |
| Viscosity @ 25°C (mPa·s) | 350–550 |
| Acid Value (mg KOH/g) | 18–24 |
| Density @ 25°C (g/cm³) | 1.12–1.16 |
| Styrene Content (wt%) | Non-reactive diluent not pre-added — supplied as pure resin |
Q1: What is the primary function of ROSKYDAL 502 BA in coating formulations?
A: ROSKYDAL 502 BA is a reactive polyester resin designed to act as a crosslinker for hydroxyl-functional resins—particularly in high-performance thermoset coatings. It contributes to enhanced hardness, chemical resistance, and film integrity upon cure, without requiring external catalysts in many standard baking conditions.
Q2: Is ROSKYDAL 502 BA suitable for low-bake or ambient-cure systems?
A: ROSKYDAL 502 BA is optimized for thermal curing, typically at temperatures ranging from 120 °C to 160 °C. While it may participate in reactions at lower temperatures, full crosslink density and optimal performance properties are generally achieved under conventional bake conditions. Ambient-cure applications are not recommended without supplemental catalysis and extensive formulation validation.
Q3: How does ROSKYDAL 502 BA compare to traditional melamine-formaldehyde crosslinkers in terms of formaldehyde emission?
A: As a non-melamine, non-formaldehyde-based polyester crosslinker, ROSKYDAL 502 BA eliminates formaldehyde release during cure—a key advantage in formulations targeting reduced VOC and improved workplace safety. Its chemistry avoids formaldehyde-generating side reactions common with amino resins.
Q4: What types of resins is ROSKYDAL 502 BA most commonly paired with?
A: ROSKYDAL 502 BA shows excellent compatibility and reactivity with hydroxyl-terminated acrylics, polyesters, and alkyds. It is frequently selected in coil coating, can coating, and industrial maintenance formulations where balanced cure speed, flexibility, and durability are required.
Q5: Does ROSKYDAL 502 BA require acid catalysis for efficient curing?
A: While ROSKYDAL 502 BA exhibits inherent reactivity toward hydroxyl groups, acid catalysts (e.g., p-toluenesulfonic acid or blocked variants) are often used to accelerate the cure profile and improve throughput in industrial settings. Catalyst selection and dosage depend on the specific resin system and desired processing window.
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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
