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High reactivity with standard MEKP initiators for rapid gel time control in ambient and warm-cure processes.
Excellent mechanical strength and dimensional stability in cured laminates, especially under thermal cycling conditions.
Low styrene emission formulation compliant with modern VOC reduction requirements for industrial production environments.
Superior compatibility with glass fiber reinforcements and common fillers including calcium carbonate and talc.
Consistent batch-to-batch viscosity and acid value, ensuring reliable processing in resin infusion and spray-up operations.
Fiberglass-reinforced plastic (FRP) tanks and chemical storage vessels.
Marine deck structures, hulls, and interior components requiring weather resistance and impact durability.
Transportation composite panels for buses, railcars, and truck bodies.
Industrial grating, ductwork, and corrosion-resistant linings for wastewater treatment systems.
Architectural cladding, façade elements, and decorative molded parts.
| Chemical Type | Unsaturated orthophthalic polyester resin |
| Product Form | Liquid, ready-to-use |
| Appearance | Clear to pale yellow, homogeneous liquid |
| Viscosity (25°C, mPa·s) | 350–450 |
| Acid Value (mg KOH/g) | 18–22 |
| Gel Time (with 1.0% MEKP, 25°C, min) | 12–18 |
| Styrene Content (wt%) | 38–42 |
| Density (25°C, g/cm³) | 1.11–1.13 |
Q1: What is the primary application field for EL-5720?
A: EL-5720 is a specialty unsaturated polyester resin designed primarily for high-performance gel coats and surface layers in fiberglass-reinforced plastic (FRP) composites, especially where enhanced weather resistance, gloss retention, and low styrene emission are required.
Q2: Is EL-5720 compatible with standard peroxide initiators?
A: Yes, EL-5720 is formulated to be compatible with common methyl ethyl ketone peroxide (MEKP) catalysts used in ambient-cure FRP processing. Initiator selection and dosage should be optimized based on ambient temperature and desired gel time.
Q3: How does EL-5720 differ from conventional orthophthalic resins?
A: EL-5720 features a modified backbone chemistry that delivers improved hydrolytic stability and reduced microcracking under thermal cycling, making it particularly suitable for exterior marine and transportation applications where long-term dimensional integrity is critical.
Q4: Can EL-5720 be thinned or modified with reactive diluents?
A: Yes — styrene is the standard reactive diluent, but EL-5720 also demonstrates good compatibility with alternative low-VOC diluents such as vinyl toluene or tertiary butyl styrene, depending on regulatory and performance requirements.
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