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High reactivity with standard peroxide initiators for rapid gelation and cycle time reduction.
Excellent mechanical strength and dimensional stability in cured laminates.
Good compatibility with common glass fiber reinforcements and fillers.
Low styrene emission profile supporting improved workplace safety and regulatory compliance.
Consistent batch-to-batch reproducibility ensured by Evonik’s stringent quality control.
Fiberglass-reinforced plastic (FRP) tanks and vessels for chemical storage.
Marine hulls, decks, and structural components requiring corrosion resistance.
Industrial grating, ducting, and corrosion-resistant linings.
Transportation composite panels for buses, railcars, and truck bodies.
Wind turbine nacelle covers and secondary structural parts.
| Chemical Type | Unsaturated orthophthalic polyester resin |
| Product Form | Liquid, ready-to-use |
| Appearance | Clear to pale yellow viscous liquid |
| Viscosity (25°C) | 350–550 mPa·s |
| Acid Value | 16–22 mg KOH/g |
| Styrene Content | 38–42 wt.% |
| Density (25°C) | 1.10–1.14 g/cm³ |
| Reactivity Class | Medium–high (per ISO 25327) |
Q1: What is the primary function of Evonik L411 in polyester resin systems?
A: Evonik L411 is a reactive liquid polyester resin designed to serve as a co-resin or modifier in unsaturated polyester (UPE) and vinyl ester formulations. It enhances flexibility, impact resistance, and surface quality while maintaining good compatibility with standard curing agents and fillers.
Q2: Is L411 suitable for use in gel coats and topcoats?
A: Yes — L411 is commonly incorporated into gel coat and topcoat formulations to improve crack resistance, gloss retention, and sandability. Its low volatility and controlled reactivity support excellent surface formation and reduced styrene emission during processing.
Q3: How does L411 affect cure kinetics and final mechanical properties?
A: L411 generally extends gel time slightly compared to conventional UPE resins, allowing improved flow and air release. The resulting cured network typically exhibits higher elongation at break and improved toughness without significant loss in hardness or chemical resistance.
Q4: Can L411 be blended with other resins such as orthophthalic or isophthalic polyesters?
A: Yes — L411 demonstrates broad miscibility with common orthophthalic, isophthalic, and terephthalic-based unsaturated polyesters. Blending ratios are formulation-dependent and should be optimized for target viscosity, reactivity, and performance requirements.
Q5: What storage conditions are recommended to maintain L411’s stability?
A: Store L411 in tightly sealed containers under cool, dry conditions, away from direct sunlight and sources of heat or ignition. Prolonged exposure to elevated temperatures or moisture may affect viscosity and shelf life; typical unopened shelf life is 12 months when stored at ≤25 °C.
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E-mail: wangxingqiang@ericwchem.com
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