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Excellent mechanical strength and dimensional stability after curing.
Good compatibility with standard styrene monomers and common initiators.
Low viscosity for easy processing, improved fiber wet-out, and enhanced moldability.
Balanced reactivity enabling reliable gel time control under ambient and elevated temperature conditions.
Superior weather resistance and UV stability when formulated with appropriate additives.
Fiberglass-reinforced plastic (FRP) tanks and vessels for chemical storage.
Marine components including boat hulls, decks, and structural laminates.
Automotive body panels and under-hood composite parts.
Industrial grating, ducting, and corrosion-resistant piping systems.
Wind turbine blade structural reinforcements and nacelle housings.
| Chemical Type | Unsaturated polyester resin (bisphenol-A fumarate based) |
| Product Form | Liquid |
| Appearance | Clear to pale yellow viscous liquid |
| Viscosity (25°C, mPa·s) | 350–450 |
| Acid Value (mg KOH/g) | 12–16 |
| Gel Time (with 1% MEKP at 25°C, min) | 18–25 |
| Solid Content (% w/w) | 99.5–100.0 |
| Styrene Content (% w/w) | 38–42 |
Q1: What are the primary application areas for ETERSET 2318?
A: ETERSET 2318 is widely used in fiberglass-reinforced plastic (FRP) applications such as tanks, pipes, and structural profiles, as well as in sheet molding compound (SMC) and bulk molding compound (BMC) formulations where good mechanical strength, dimensional stability, and moderate chemical resistance are required.
Q2: How does ETERSET 2318 compare to general-purpose unsaturated polyester resins in terms of reactivity and gel time?
A: ETERSET 2318 exhibits a balanced reactivity profile—designed for reliable processing in both open-mold and compression-molding operations. Its gel time is typically longer than high-reactivity resins but shorter than low-reactivity grades, offering flexibility in cycle time optimization without compromising flow or wet-out performance.
Q3: What types of initiators and accelerators are commonly used with this resin?
A: ETERSET 2318 is compatible with standard organic peroxides such as methyl ethyl ketone peroxide (MEKP) and benzoyl peroxide (BPO), often paired with cobalt-based accelerators. Selection and dosage depend on ambient conditions, part geometry, and desired cure profile—typically used at low concentrations to achieve full crosslinking without premature decomposition.
Q4: Can ETERSET 2318 be blended with other unsaturated polyester resins or vinyl ester resins?
A: Blending with other unsaturated polyesters is generally feasible and may be used to fine-tune viscosity, reactivity, or final property balance. However, blending with vinyl ester resins is not recommended due to potential incompatibility issues affecting homogeneity, cure behavior, and long-term performance.
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