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High reactivity with low styrene emission for improved workplace safety and regulatory compliance.
Excellent mechanical strength and impact resistance in cured composites.
Optimized viscosity profile for superior fiber wet-out and processability in RTM and infusion processes.
Good weathering resistance and UV stability for long-term outdoor performance.
Consistent batch-to-batch reproducibility meeting stringent Evonik quality control standards.
Fiberglass-reinforced panels for transportation interiors and exterior body parts.
Wind turbine blade components requiring high fatigue resistance and dimensional stability.
Marine hulls and deck structures demanding corrosion resistance and water impermeability.
Industrial tanks and piping systems handling mild chemical environments.
Architectural cladding and façade elements exposed to variable climatic conditions.
| Chemical Type | Unsaturated orthophthalic polyester resin |
| Product Form | Liquid, ready-to-use |
| Appearance | Clear to pale yellow viscous liquid |
| Viscosity (25°C, mPa·s) | 350–450 |
| Styrene Content (wt %) | 38–42 |
| Gel Time (100 g, 25°C, 1.5% MEKP) | 8–12 minutes |
| Density (25°C, g/cm³) | 1.12–1.15 |
| Primary Applications | RTM, vacuum infusion, spray-up, and hand lay-up composite manufacturing |
Q1: What is the primary function of LH826-05A in polyester resin systems?
A: LH826-05A is a specialty reactive diluent and viscosity modifier designed to reduce processing viscosity while maintaining good reactivity and final crosslink density in unsaturated polyester resins. It supports improved wetting of fillers and reinforcements without significantly compromising mechanical performance or cure kinetics.
Q2: Is LH826-05A compatible with standard peroxide initiators used in polyester curing?
A: Yes, LH826-05A is fully compatible with common organic peroxides such as MEKP and BPO, and does not interfere with conventional free-radical polymerization pathways. No pre-reactivity screening is typically required, though optimal initiator dosage should be confirmed within the specific formulation context.
Q3: How does LH826-05A compare to styrene in terms of VOC profile and handling safety?
A: LH826-05A offers a lower volatility and reduced odor compared to styrene, contributing to improved workplace air quality and lower VOC emissions during processing. Its higher flash point and lower vapor pressure also enhance handling safety during storage and metering.
Q4: Can LH826-05A be used in gel coat formulations?
A: Yes, LH826-05A is suitable for use in gel coat systems where improved surface finish, reduced styrene emission, and enhanced pigment dispersion stability are desired. It helps maintain gloss retention and minimizes surface tackiness when properly formulated and cured.
Q5: What are typical dosage guidelines for LH826-05A in standard laminating resins?
A: Dosage is formulation-dependent, but LH826-05A is generally used at levels between 5% and 25% by weight relative to the base polyester resin, replacing part of the styrene or other reactive diluents. Optimal loading should be determined through rheological testing and performance validation under intended processing conditions.
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E-mail: wangxingqiang@ericwchem.com
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