Wind Energy Blade UPR
Key Features
- Optimized fatigue resistance for 20+ year blade life
- Ultra-low viscosity for VARI of large blade sections
- Superior hydrolytic stability for outdoor weather exposure
- NPG isophthalic backbone for highest UPR moisture resistance
- Validated for wind blade manufacturing process requirements
Wind Energy Blade UPR is a high-performance isophthalic unsaturated polyester resin specifically formulated for the demanding fatigue and weathering requirements of wind turbine blade structural laminates in the 1-5 MW turbine range. The resin is characterized by low viscosity (100-200 mPa·s) for vacuum infusion compatibility, superior fatigue resistance under cyclic loading, and excellent hydrolytic stability for 20+ year outdoor service life.
The isophthalic backbone and NPG glycol modification provide the best balance of water resistance, flexibility, and fatigue life in the UPR product family. Dynamic fatigue testing (ASTM D3479, tension-tension at R=0.1) shows retained strength >65% of UTS after 10⁶ cycles at 50% strain level. This performance is critical for blades experiencing billions of fatigue cycles over their design life.
Viscosity at 25°C is 100-200 mPa·s, fully compatible with VARI processes. Gel time at 20°C with 1.0-1.5% MEKP is 60-120 minutes for large blade infusion. Post-cure at 70-80°C for 4 hours is standard practice in wind blade manufacturing to achieve maximum mechanical properties and chemical resistance. Supplied in IBC containers for blade factory use.
Specifications
| Parameter | Value |
|---|---|
| Package | IBC 1000L, Drum 200L |
| Appearance | Clear to pale yellow liquid |
| Viscosity (25°C) | 100-200 mPa·s |
| HDT (post-cured 80°C/4h) | ≥80°C |
| Gel Time (20°C, 1.0% MEKP) | 60-120 min |
| Water Absorption (7 days, 23°C) | ≤0.4% |
| Fatigue Retention (10⁶ cycles, 50% UTS) | >65% |
Applications
FAQ
Epoxy systems (e.g., epoxy-wind-blade) provide higher fatigue resistance (typically 70-75% UTS retention at 10⁶ cycles), better interlaminar shear strength, and lower void content. UPR wind blade grades are used in smaller turbines (≤2 MW) where the cost advantage justifies the slightly lower performance. For 3-8 MW turbines and offshore applications, epoxy is the standard specification due to its superior fatigue life, which correlates directly with blade reliability over 25-year lifetimes.
Direct Contact
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