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High reactivity with standard MEKP initiators for rapid gelation and efficient production cycles.
Excellent compatibility with common glass fiber reinforcements and mineral fillers.
Low styrene emission profile, supporting improved workplace air quality and regulatory compliance.
Consistent viscosity and shelf stability up to 6 months when stored at 25°C in sealed containers.
Balanced toughness and surface hardness for structural and semi-structural composite parts.
Fiberglass-reinforced plastic (FRP) tanks and chemical storage vessels.
Marine deck components and non-structural hull laminates.
Architectural cladding panels and decorative GRP façade elements.
Industrial grating, walkways, and corrosion-resistant equipment housings.
Wind turbine nacelle covers and auxiliary composite enclosures.
| Chemical Type | Unsaturated orthophthalic polyester resin |
| Product Form | Liquid, ready-to-use |
| Appearance | Clear to pale yellow viscous 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 |
| Key Features | Fast cure, low exotherm, high fiber wet-out |
Q1: What is the primary application field for EL-5500?
A: EL-5500 is a high-reactivity unsaturated polyester resin designed primarily for demanding composite applications including pultrusion, filament winding, and reinforced thermoset molding—especially where enhanced mechanical performance and fast cycle times are required.
Q2: Is EL-5500 compatible with common peroxide initiators?
A: Yes, EL-5500 exhibits good compatibility with standard organic peroxides such as MEKP and BPO. Initiation efficiency and gel time depend on peroxide type, concentration, and processing temperature—formulators should conduct small-scale trials to optimize cure profile.
Q3: How does EL-5500 perform in terms of moisture resistance and dimensional stability?
A: Due to its highly crosslinked network structure, EL-5500 delivers improved resistance to moisture absorption and superior dimensional stability under humid or thermal cycling conditions compared to conventional general-purpose polyesters.
Q4: Can EL-5500 be used in low-VOC or styrene-reduced formulations?
A: EL-5500 can be formulated with reactive diluents and low-styrene alternatives to help reduce overall VOC emissions. However, viscosity and reactivity adjustments may be needed—compatibility testing is recommended when substituting traditional styrene.
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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
