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Excellent mechanical strength and impact resistance after curing.
Good compatibility with standard styrene monomers and common accelerators.
Low viscosity for enhanced fiber wet-out and improved processability in hand lay-up and spray-up applications.
Consistent reactivity profile enabling reliable gel time control under ambient and elevated temperatures.
High solid content delivering reduced VOC emissions compared to conventional high-solvent resins.
Fiberglass-reinforced plastic (FRP) tanks and chemical storage vessels.
Marine components including boat hulls, decks, and structural panels.
Industrial corrosion-resistant ducting and fume hoods.
Automotive aftermarket body parts and repair compounds.
Building and construction cladding, roofing sheets, and architectural profiles.
| Chemical Type | Unsaturated polyester resin (orthophthalic-based) |
| 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% MEKP, 25°C, min) | 12–18 |
| Styrene Content (wt%) | 38–42 |
| Density (25°C, g/cm³) | 1.12–1.16 |
Q1: What are the key performance characteristics of ETERSET 2731-3?
A: ETERSET 2731-3 is a medium-viscosity, general-purpose unsaturated polyester resin designed for excellent gel time control, good mechanical strength development, and balanced reactivity in ambient-cure and low-energy UV-assisted systems. It offers reliable compatibility with common peroxide initiators and exhibits favorable surface cure behavior in laminating and casting applications.
Q2: Which initiators are typically recommended for use with this resin?
A: ETERSET 2731-3 is compatible with standard organic peroxides such as methyl ethyl ketone peroxide (MEKP) and benzoyl peroxide (BPO), depending on the curing method and temperature profile. Selection should be based on desired gel time, exotherm management, and final part requirements—formulators are advised to conduct small-scale trials to optimize initiator type and dosage.
Q3: Can ETERSET 2731-3 be used in fiberglass-reinforced composites for structural applications?
A: Yes, it is widely used in hand lay-up, spray-up, and filament winding processes for producing semi-structural and non-structural FRP components—including tanks, ducts, and marine parts—where moderate chemical resistance and dimensional stability under ambient conditions are required.
Q4: How does ETERSET 2731-3 perform in terms of post-cure shrinkage and surface hardness?
A: This resin demonstrates typical shrinkage behavior for orthophthalic-based unsaturated polyesters—moderate volumetric shrinkage during polymerization—and achieves good surface hardness after full cure, especially when formulated with appropriate fillers and cured under recommended conditions.
Q5: Is ETERSET 2731-3 suitable for pigmented or filled systems?
A: Yes, it readily accepts common pigment dispersions and mineral fillers such as calcium carbonate and alumina trihydrate. Formulations may require minor adjustments to inhibitor levels or rheology modifiers to maintain stability and processing consistency, particularly at higher filler loadings.
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