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High reactivity with standard peroxide initiators for rapid gelation and efficient production cycles.
Excellent compatibility with glass fiber reinforcements and common fillers used in composite manufacturing.
Low styrene emission profile, supporting improved workplace safety and regulatory compliance.
Good mechanical performance retention after post-curing, especially in tensile and flexural strength.
Consistent batch-to-batch reproducibility ensured by Evonik’s stringent quality control protocols.
Fiberglass-reinforced plastic (FRP) tanks and chemical storage vessels.
Marine deck components and hull laminates requiring corrosion resistance.
Industrial grating and structural profiles for wastewater treatment plants.
Wind turbine nacelle covers and secondary structural parts.
Transportation interior panels and lightweight truck body components.
| 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 |
| Reactive Diluent | Styrene (~38–42 wt%) |
| Acid Value | 12–18 mg KOH/g |
| Density (25 °C) | 1.10–1.14 g/cm³ |
| Primary Applications | Hand lay-up, spray-up, and filament winding of FRP composites |
Q1: What is the primary function of Evonik S1402 in polyester resin systems?
A: Evonik S1402 functions as a reactive diluent and viscosity modifier, enhancing processability while maintaining crosslink density and mechanical performance in unsaturated polyester resins.
Q2: Is S1402 compatible with common free-radical initiators used in polyester curing?
A: Yes, S1402 is fully compatible with standard peroxide initiators such as MEKP and BPO, and does not interfere with conventional room-temperature or elevated-temperature curing profiles.
Q3: How does S1402 compare to styrene in terms of VOC profile and handling safety?
A: S1402 offers a significantly lower vapor pressure and reduced volatility compared to styrene, contributing to lower VOC emissions during processing and improved workplace exposure characteristics — though appropriate ventilation and PPE remain essential.
Q4: Can S1402 be used in gel coat formulations?
A: Yes, S1402 is suitable for gel coat applications where reduced styrene emission, improved surface quality, and consistent cure behavior are required — formulation adjustments may be needed to optimize flow and gloss retention.
Q5: What storage conditions are recommended for long-term stability?
A: Store in tightly sealed containers under cool, dry conditions away from direct sunlight and strong oxidizing agents; typical shelf life is 12 months when stored below 30 °C and protected from moisture ingress.
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E-mail: wangxingqiang@ericwchem.com
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