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Excellent mechanical strength and dimensional stability after curing.
Good compatibility with standard MEKP initiators and low-profile additives.
Balanced reactivity for reliable gel time control in ambient and elevated temperature processing.
Low viscosity for enhanced fiber wet-out and improved mold filling in composites manufacturing.
Superior weather resistance and UV stability when formulated with appropriate inhibitors and pigments.
Fiberglass-reinforced plastic (FRP) tanks and vessels for chemical storage.
Marine components including boat hulls, decks, and structural panels.
Transportation parts such as truck body panels and railway interior components.
Industrial grating, ductwork, and corrosion-resistant linings.
Precision-cast architectural cladding and decorative molded products.
| Chemical Type | Unsaturated polyester resin (orthophthalic-based) |
| Product Form | Liquid, ready-to-use |
| Appearance | Clear to pale yellow, homogeneous liquid |
| Viscosity (25°C) | 250–350 mPa·s (Brookfield, spindle #3, 20 rpm) |
| Solid Content | 99.5–100 wt% |
| Acid Value | 18–22 mg KOH/g |
| Gel Time (with 1.0% MEKP, 25°C) | 12–18 minutes |
| Density (25°C) | 1.07–1.09 g/cm³ |
Q1: What are the primary application areas for ETERSET 2475?
A: ETERSET 2475 is widely used in fiberglass-reinforced plastics (FRP) manufacturing, including tanks, pipes, marine components, and corrosion-resistant industrial laminates. It is also suitable for sheet molding compound (SMC) and bulk molding compound (BMC) formulations where balanced mechanical strength and chemical resistance are required.
Q2: How does ETERSET 2475 compare to standard orthophthalic resins in terms of performance?
A: ETERSET 2475 is a modified isophthalic-based unsaturated polyester resin offering improved hydrolytic stability and enhanced resistance to acids and solvents compared to conventional orthophthalic resins. Its molecular structure supports better dimensional stability and reduced moisture absorption in demanding service environments.
Q3: Which initiators and accelerators are typically recommended for curing ETERSET 2475?
A: The resin is compatible with standard organic peroxide initiators such as methyl ethyl ketone peroxide (MEKP), and commonly used with cobalt naphthenate or cobalt octoate as accelerators. Optimal catalyst selection and dosage depend on ambient conditions, part thickness, and desired gel time—formulators should conduct small-scale trials to fine-tune the system.
Q4: Can ETERSET 2475 be used in contact-molded laminates exposed to outdoor weathering?
A: Yes—when properly formulated with UV stabilizers and pigmented topcoats, ETERSET 2475 demonstrates good retention of mechanical properties and surface integrity under prolonged outdoor exposure. However, long-term weathering performance depends on full system design, including gel coat selection and post-cure conditions.
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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
