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Excellent mechanical strength and dimensional stability after curing.
Good compatibility with standard MEKP initiators and low-profile additives.
Low viscosity for enhanced fiber wet-out and improved mold filling in composite processing.
Superior weather resistance and UV stability for outdoor applications.
Consistent batch-to-batch performance ensured by Chang Chun’s stringent quality control system.
Fiberglass-reinforced plastic (FRP) tanks and chemical storage vessels.
Pultruded profiles for structural supports and ladder rails.
RTM and hand lay-up composites for transportation components.
Marine parts including boat hulls, decks, and fenders.
Architectural cladding panels and decorative GRP elements.
| Chemical Type | Orthophthalic unsaturated polyester resin |
| Product Form | Liquid, ready-to-use |
| Appearance | Clear to pale yellow viscous liquid |
| Viscosity (25°C, mPa·s) | 350–450 |
| Gel Time (with 1.0% MEKP, 25°C, min) | 18–25 |
| Solid Content (% w/w) | 99.5–100.0 |
| Density (25°C, g/cm³) | 1.12–1.16 |
| Reactivity Profile | Medium reactivity; suitable for ambient and elevated temperature curing |
Q1: What are the primary application areas for ETERSET 2739?
A: ETERSET 2739 is widely used in fiberglass-reinforced plastic (FRP) manufacturing, including corrosion-resistant tanks, pipes, and structural profiles. It is also suitable for marine components, automotive body parts, and decorative laminates where good mechanical strength and surface finish are required.
Q2: Which curing agents are typically recommended for this resin?
A: ETERSET 2739 is compatible with standard methyl ethyl ketone peroxide (MEKP) initiators. Selection of the specific MEKP type (e.g., low-temperature or medium-reactivity grade) should be based on processing conditions, ambient temperature, and desired gel time—formulators are advised to conduct small-scale trials to optimize performance.
Q3: How does ETERSET 2739 perform in terms of chemical resistance and weatherability?
A: This resin offers good resistance to dilute acids, alkalis, and salt solutions when properly cured and post-cured. Its weatherability is moderate; for long-term outdoor exposure, a UV-stabilized topcoat or gel coat is recommended to minimize chalking and gloss loss.
Q4: Can ETERSET 2739 be blended with other unsaturated polyester resins or additives?
A: Yes, it can be blended with certain styrene-compatible unsaturated polyesters to modify viscosity, cure profile, or final properties—however, compatibility testing is essential prior to full-scale use. Common additives include thixotropic agents, pigments, and flame retardants, provided they do not interfere with the free-radical curing mechanism.
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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
