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High reactivity with standard styrene monomers for rapid gelation and efficient production cycles.
Excellent mechanical strength and impact resistance after full cure, suitable for structural composites.
Low viscosity at room temperature enabling easy handling, impregnation, and fiber wet-out.
Good weathering and UV resistance when formulated with appropriate stabilizers.
Consistent batch-to-batch performance ensured by strict in-process quality control.
Fiberglass-reinforced plastic (FRP) tanks and vessels for chemical storage.
Marine components including boat hulls, decks, and structural panels.
Wind turbine blade shells and nacelle covers requiring dimensional stability.
Automotive body panels and under-hood components demanding thermal resilience.
Architectural cladding and decorative molded parts with high surface finish.
| Chemical Type | Unsaturated orthophthalic polyester resin |
| Product Form | Liquid |
| Appearance | Clear to pale yellow, homogeneous liquid |
| Viscosity (25°C) | 350–450 cP |
| Acid Value | 18–22 mg KOH/g |
| Gel Time (with 1% MEKP, 25°C) | 12–16 minutes |
| Solids Content | 99.5–100 wt% |
| Styrene Content | 38–42 wt% |
Q1: What is the primary application field for EL-6500?
A: EL-6500 is a medium-viscosity unsaturated polyester resin designed primarily for reinforced composites in industrial and marine applications—such as pultrusion, filament winding, and structural laminates—where balanced mechanical strength, dimensional stability, and processability are required.
Q2: Is EL-6500 compatible with standard peroxide initiators?
A: Yes, EL-6500 is formulated to react efficiently with common organic peroxides such as methyl ethyl ketone peroxide (MEKP) and benzoyl peroxide (BPO), enabling reliable room-temperature or elevated-temperature curing depending on initiator selection and formulation design.
Q3: How does EL-6500 perform in terms of chemical resistance?
A: EL-6500 exhibits good resistance to dilute acids, alkalis, and aliphatic hydrocarbons in cured form. Performance against strong oxidizing agents, aromatic solvents, or prolonged exposure to hot water may vary and should be validated under end-use conditions.
Q4: Can EL-6500 be used in low-VOC or styrene-reduced formulations?
A: While EL-6500 is a conventional styrenated polyester resin, it can be adapted into lower-VOC systems through partial styrene substitution with reactive diluents or by incorporating post-cure treatments—though compatibility and final properties must be confirmed experimentally for each modified formulation.
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E-mail: wangxingqiang@ericwchem.com
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