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Highly reactive unsaturated polyester resin with excellent gel time control for optimized processing.
Outstanding mechanical properties, including high tensile strength and impact resistance after curing.
Low styrene emission formulation supporting improved workplace safety and regulatory compliance.
Excellent compatibility with standard fillers, pigments, and glass reinforcements used in composites.
Consistent batch-to-batch reproducibility ensuring reliable performance in industrial manufacturing.
Fiberglass-reinforced plastic (FRP) tanks and chemical storage vessels.
Automotive body panels and under-hood components requiring dimensional stability.
Marine deck structures and boat hulls demanding high moisture resistance.
Industrial grating and corrosion-resistant ducting systems.
Architectural cladding and façade elements exposed to outdoor weathering.
| Chemical Type | Unsaturated polyester resin |
| Product Form | Liquid, ready-to-use |
| Appearance | Clear to pale yellow viscous liquid |
| Primary Applications | Structural composites, corrosion-resistant linings, FRP products |
| Key Features | Low exotherm, good flowability, high reactivity with MEKP initiators |
| Benefits | Reduced cycle times, superior surface finish, excellent adhesion to glass fibers |
| Storage Stability | ≥6 months at 20–25 °C in sealed containers |
| Viscosity (25 °C) | 350–550 mPa·s (Brookfield DV-II+ @ 20 rpm) |
Q1: What is the primary function of DYNAPOL L 651 in polyester-based formulations?
A: DYNAPOL L 651 is a low-viscosity, reactive liquid polyester resin designed primarily as a co-resin or modifier to enhance flexibility, impact resistance, and adhesion in unsaturated polyester systems—especially in gel coats, laminating resins, and casting applications.
Q2: Is DYNAPOL L 651 compatible with standard free-radical curing systems?
A: Yes, DYNAPOL L 651 is fully compatible with conventional peroxide-initiated free-radical polymerization systems, including MEKP and BPO initiators, and integrates smoothly into typical unsaturated polyester resin processing conditions without requiring special handling or catalyst adjustments.
Q3: How does DYNAPOL L 651 affect cure kinetics and final mechanical properties?
A: It generally extends gel time slightly while improving post-cure toughness and elongation at break. Final cured networks exhibit enhanced resistance to microcracking and improved stress distribution—particularly beneficial in thick-section castings or dynamically loaded composites.
Q4: Can DYNAPOL L 651 be used in food-contact or potable water applications?
A: DYNAPOL L 651 is not pre-qualified for direct food-contact or potable water applications. Its suitability must be evaluated case-by-case in the final cured system, considering full formulation, curing conditions, and applicable regulatory requirements—consult Evonik technical support for compliance guidance.
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E-mail: wangxingqiang@ericwchem.com
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Building A1, Jiete Industrial Park, Huangpu District, Guangzhou City, Guangdong Province, China
