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High reactivity with standard peroxide initiators for rapid gelation and efficient production cycles.
Excellent mechanical strength and dimensional stability in cured laminates.
Good resistance to water, alkalis, and diluted acids in reinforced composite structures.
Low styrene emission profile supporting improved workplace safety and regulatory compliance.
Consistent batch-to-batch reproducibility ensured by Evonik’s stringent quality control standards.
Fiberglass-reinforced plastic (FRP) tanks and chemical storage vessels.
Corrosion-resistant linings for industrial piping and ductwork.
Marine deck components and hull reinforcements requiring weather durability.
Automotive under-hood composite parts exposed to thermal and chemical stress.
Wind turbine blade structural adhesives and secondary bonding matrices.
| Chemical Type | Unsaturated orthophthalic polyester resin |
| Product Form | Liquid, ready-to-use |
| Appearance | Clear to pale yellow, homogeneous liquid |
| Viscosity (25°C) | 350–550 mPa·s |
| Acid Value | 16–22 mg KOH/g |
| Reactive Diluent | Styrene (~38–42 wt%) |
| Density (25°C) | 1.10–1.14 g/cm³ |
| Storage Stability | ≥6 months at ≤25°C in sealed containers |
Q1: What is the primary function of Evonik L952 in polyester resin systems?
A: Evonik L952 is a reactive liquid polyester resin designed to serve as a co-resin or viscosity modifier in unsaturated polyester (UPE) formulations. It enhances flexibility, improves impact resistance, and supports better fiber wet-out in reinforced composites without significantly compromising cure speed or final hardness.
Q2: Is L952 compatible with standard UPE resins and common curing agents?
A: Yes, L952 exhibits good miscibility with conventional orthophthalic and isophthalic unsaturated polyester resins. It is compatible with standard peroxide initiators such as MEKP and BPO, and does not require special handling or pre-treatment for integration into typical composite manufacturing processes.
Q3: How does L952 affect the mechanical properties of cured laminates?
A: Incorporating L952 typically increases fracture toughness and elongation at break while maintaining acceptable tensile and flexural strength. It helps reduce brittleness in thick-section or highly filled systems, making it especially beneficial for applications requiring improved damage tolerance.
Q4: Can L952 be used in gel coats or surface layers?
A: While L952 is primarily formulated for bulk resin modification, it may be included at low levels in gel coat systems where enhanced flexibility and reduced microcracking are desired. However, its use in surface layers should be validated for compatibility with pigments, thixotropes, and topcoat adhesion requirements.
Q5: What storage conditions are recommended for optimal shelf life?
A: Store L952 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 reactivity over time; typical shelf life is 12 months when stored properly.
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E-mail: wangxingqiang@ericwchem.com
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