Vacuum Infusion Grade UPR
Key Features
- Ultra-low viscosity (80-180 mPa·s) for large-structure infusion
- Extended pot life up to 120 min for complex infusion setups
- Void content <0.5% with proper vacuum technique
- Isophthalic base for superior water and weather resistance
- Closed process — eliminates direct styrene operator exposure
Vacuum Infusion Grade UPR is a purpose-built isophthalic resin with the lowest viscosity (80-180 mPa·s at 25°C) in the UPR product range, designed for vacuum-assisted resin infusion (VARI) of large composite structures including wind turbine blade shells, boat hulls, and industrial panels. The ultra-low viscosity enables rapid resin flow through dry fiber stacks under full vacuum.
The resin is formulated with a slow inhibitor package providing a pot life of 60-120 minutes (adjustable), allowing complete infusion of structures up to 10-15 m² before gelation. The isophthalic backbone provides excellent water resistance and HDT ≥80°C after post-cure. Cure is by MEKP/cobalt at room temperature or heated tools at 50-70°C for faster production cycles.
Infused laminates at 50-55% fiber volume (glass) achieve flexural strength 270-350 MPa, tensile modulus 20-25 GPa, and void content <0.5%. The low void content, resulting from full vacuum compaction, gives consistently higher mechanical properties than open-mold hand lay-up while eliminating direct styrene exposure to operators. This grade is complementary to upr-rtm-infusion but offers slightly lower viscosity for the most demanding large-structure infusion applications.
Specifications
| Parameter | Value |
|---|---|
| Appearance | Clear to pale yellow liquid |
| Viscosity (25°C) | 80-180 mPa·s |
| HDT (post-cured 80°C/2h) | ≥80°C |
| Flexural Strength (50% Vf) | 270-350 MPa |
| Gel Time (20°C, 1.5% MEKP) | 45-90 min |
| Pot Life (20°C, 1.0% MEKP) | 60-120 min |
| Void Content (vacuum infused) | <0.5% |
Applications
FAQ
Both are isophthalic UPR grades for closed-mold processes. The vacuum infusion grade (this product) has slightly lower viscosity (80-180 vs. 100-250 mPa·s) and longer pot life (60-120 vs. 40-90 min) specifically for large one-sided open-tool vacuum infusion where flow distances are greatest. The RTM infusion grade is for both RTM injection and vacuum infusion and has slightly faster gel for injection through mix heads.
Direct Contact
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