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High reactivity with standard peroxide initiators, enabling fast gel time and efficient production cycles.
Excellent mechanical strength and dimensional stability in cured laminates and molded parts.
Good resistance to water, weak acids, and alkaline environments after full curing.
Low viscosity for superior fiber wet-out and ease of processing in spray-up, hand lay-up, and filament winding.
Consistent batch-to-batch quality ensured by Chang Chun’s ISO-certified manufacturing control system.
Fiberglass-reinforced plastic (FRP) tanks and chemical storage vessels.
Marine hulls, decks, and structural components requiring corrosion resistance.
Automotive body panels and under-hood composite parts.
Industrial grating, ductwork, and corrosion-resistant piping systems.
Wind turbine blade root sections and nacelle housings.
| Chemical Type | Orthophthalic unsaturated polyester resin |
| Product Form | Liquid, ready-to-use |
| Appearance | Clear to pale yellow, homogeneous liquid |
| Viscosity (25°C, mPa·s) | 280–360 |
| Gel Time (100 g, 1.5% MEKP, 25°C, min) | 12–18 |
| Solid Content (% w/w) | 99.5–100.0 |
| Density (25°C, g/cm³) | 1.12–1.16 |
| Primary Applications | FRP fabrication via hand lay-up, spray-up, and filament winding |
Q1: What are the key performance characteristics of ETERSET 2731T?
A: ETERSET 2731T is a medium-reactivity, general-purpose unsaturated polyester resin offering balanced gel time, exotherm profile, and mechanical strength. It delivers good surface hardness, moderate flexibility, and reliable compatibility with common styrene monomers and free-radical initiators used in ambient- or elevated-temperature curing systems.
Q2: Which reinforcement materials and fillers are typically compatible with this resin?
A: ETERSET 2731T demonstrates excellent compatibility with standard glass fiber reinforcements (e.g., chopped strands, woven rovings, and mats) as well as common mineral fillers such as calcium carbonate, talc, and alumina trihydrate. Compatibility with specialty additives (e.g., thixotropes or flame retardants) should be verified through small-scale formulation trials.
Q3: How does ETERSET 2731T perform in ambient-cure applications like hand lay-up or spray-up?
A: This resin is well-suited for ambient-cure processes, delivering consistent gel times and adequate green strength when formulated with conventional MEKP or cobalt-accelerated peroxide systems. Its viscosity and reactivity profile support good wet-out of reinforcements and manageable working time under typical workshop conditions.
Q4: Can ETERSET 2731T be post-cured, and what benefits does that provide?
A: Yes — post-curing at elevated temperatures (e.g., 60–80 °C) is commonly applied to enhance crosslink density, improve thermal stability, and increase final hardness and chemical resistance. The extent of improvement depends on post-cure duration, temperature profile, and base formulation.
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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
