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High reactivity with standard MEKP catalysts for rapid room-temperature gelation.
Excellent thixotropic stability—minimizes sagging in vertical and overhead applications.
Low styrene emission profile, supporting improved workplace air quality and regulatory compliance.
Superior mechanical toughness and impact resistance after full cure.
Consistent batch-to-batch performance validated via in-house QC testing and ISO 9001-controlled manufacturing.
Fiberglass-reinforced plastic (FRP) tanks and secondary containment systems.
Industrial corrosion-resistant piping and ductwork linings.
Marine deck and hull laminates requiring high moisture resistance.
Transportation components including truck body panels and bus interior parts.
Custom-molded architectural cladding and decorative façade elements.
| Chemical Type | Unsaturated orthophthalic polyester resin |
| Product Form | Liquid, ready-to-use |
| Appearance | Clear to pale yellow, homogeneous liquid |
| Viscosity (25°C) | 350–450 mPa·s (Brookfield RV-DV2T, spindle #3, 20 rpm) |
| Gel Time (with 1.0% MEKP, 25°C) | 12–16 minutes |
| Styrene Content | 38–42 wt% |
| Reactive Diluent | Styrene |
| Storage Stability | 6 months at ≤25°C in sealed, original container |
Q1: What is the primary application of EL-5500K in composite manufacturing?
A: EL-5500K is a high-reactivity, low-viscosity unsaturated polyester resin engineered for structural and semi-structural composite applications—particularly suited for filament winding, pultrusion, and resin transfer molding (RTM) where rapid gelation, good fiber wet-out, and consistent mechanical performance are required.
Q2: How does EL-5500K compare to standard orthophthalic resins in terms of heat resistance and dimensional stability?
A: EL-5500K offers enhanced thermal performance and reduced post-cure shrinkage compared to conventional orthophthalic resins, supporting improved long-term dimensional stability under moderate thermal cycling—making it suitable for applications requiring elevated service temperatures without full phenolic substitution.
Q3: What type of initiators and accelerators are compatible with EL-5500K?
A: EL-5500K is formulated for compatibility with standard organic peroxides such as methyl ethyl ketone peroxide (MEKP), and responds well to cobalt-based accelerators. Cure profiles can be tailored across ambient to elevated temperatures depending on initiator selection and dosage.
Q4: Is EL-5500K suitable for marine-grade laminating systems?
A: Yes—EL-5500K demonstrates excellent water resistance and hydrolytic stability after full cure, and is widely used in marine hulls, decks, and structural reinforcements where long-term exposure to humid or saline environments is expected. Proper post-curing and barrier coat integration are recommended for critical immersion service.
Q5: Can EL-5500K be modified with fillers or thixotropic agents without compromising reactivity?
A: Yes—EL-5500K accepts common mineral fillers (e.g., calcium carbonate, alumina trihydrate) and fumed silica-based thixotropes at typical loadings. Reactivity remains predictable when using non-reactive additives; however, formulation adjustments to initiator levels may be needed to maintain target gel and cure times.
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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
