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High reactivity with standard peroxide initiators for rapid gelation and efficient production cycles.
Excellent compatibility with common glass fiber reinforcements and mineral fillers.
Good mechanical strength and dimensional stability in cured laminates.
Low styrene emission profile supporting improved workplace safety and regulatory compliance.
Tailored viscosity for optimal wet-out of reinforcement fabrics in hand lay-up and spray-up processes.
Fiberglass-reinforced plastic (FRP) tanks and chemical storage vessels.
Marine deck components and boat hulls requiring balanced toughness and processability.
Industrial grating and corrosion-resistant ducting systems.
Transportation interior panels and structural parts for rail and bus applications.
Architectural cladding and decorative façade elements.
| Chemical Type | Unsaturated orthophthalic polyester resin |
| Product Form | Liquid, ready-to-use |
| Appearance | Clear to pale yellow, homogeneous liquid |
| Viscosity (25 °C, mPa·s) | 350–450 |
| Acid Value (mg KOH/g) | 18–24 |
| Reactive Diluent | Styrene (35–38 wt%) |
| Density (25 °C, g/cm³) | 1.11–1.13 |
| Flash Point (°C, closed cup) | 32–36 |
Q1: What is the primary function of LS436-12 in polyester resin systems?
A: LS436-12 is a reactive liquid polyester resin designed to serve as a co-resin or modifier in unsaturated polyester (UPE) formulations, enhancing flexibility, impact resistance, and surface hardness without significantly compromising cure speed or chemical resistance.
Q2: Is LS436-12 compatible with standard UPE resins and common initiators?
A: Yes, LS436-12 exhibits good miscibility with conventional orthophthalic and isophthalic unsaturated polyester resins, and it cures effectively with standard peroxide initiators such as MEKP and CHP under typical ambient or elevated temperature conditions.
Q3: How does LS436-12 influence the viscosity and processing behavior of formulated resins?
A: LS436-12 has a relatively low viscosity compared to many solid or high-viscosity polyester resins, which supports easier handling, improved filler wetting, and enhanced flow characteristics—particularly beneficial for casting, pultrusion, and gel coat applications.
Q4: Can LS436-12 be used in outdoor or UV-exposed applications?
A: While LS436-12 itself is not inherently UV-stabilized, it can be successfully incorporated into outdoor-grade formulations when combined with appropriate UV absorbers and HALS stabilizers—common practice for durable gel coats and marine composites.
Q5: What safety and handling precautions should be observed during storage and use?
A: LS436-12 should be stored in tightly sealed containers under cool, dry, and well-ventilated conditions, away from strong oxidizers and direct sunlight. Standard PPE—including nitrile gloves, safety goggles, and respiratory protection during prolonged handling—is recommended per Evonik’s Safety Data Sheet.
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E-mail: wangxingqiang@ericwchem.com
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