Filament Winding Grade UPR
Key Features
- Low viscosity (150-300 mPa·s) for efficient fiber wet-out in bath
- Long bath stability for multi-hour winding runs
- High fiber volume fraction achievable (65-70% Vf)
- Compliant with AWWA C950 and ISO 14692 pipe standards
- Available in isophthalic and BPA-fumarate grades
Filament Winding Grade UPR is a low-viscosity isophthalic or bisphenol-fumarate based resin formulated for the continuous filament winding process, where glass or carbon fiber rovings are drawn through a resin bath and wound onto a rotating mandrel at precisely controlled tension and angle. The resin bath viscosity must remain stable over the duration of the winding run (typically 2-8 hours) without excessive thickening from styrene evaporation.
Viscosity at 25°C is 150-300 mPa·s for efficient fiber bundle penetration and low resistance in the resin bath. The resin is formulated with inhibitor levels optimized for bath stability and gel time of 30-60 minutes at 25°C with 1.5% MEKP, allowing adequate winding time before cure. Cure is typically initiated thermally (oven cure at 60-80°C or infrared post-cure).
Cured filament-wound structures at 65-70% fiber volume fraction achieve hoop tensile strength of 500-700 MPa and axial flexural strength of 200-300 MPa, making them suitable for pressure pipes, chemical vessels, underground storage tanks, pressure cylinders, and masts. The resin meets AWWA C950, ASTM D2992, and ISO 14692 standards for FRP piping systems.
Specifications
| Parameter | Value |
|---|---|
| Standards | AWWA C950, ASTM D2992, ISO 14692 |
| Appearance | Clear to pale yellow liquid |
| Density (25°C) | 1.12-1.14 g/cm³ |
| Resin Bath Life | 2-8 hours |
| Viscosity (25°C) | 150-300 mPa·s |
| Gel Time (25°C, 1.5% MEKP) | 30-60 min |
| Hoop Tensile Strength (65% Vf) | 500-700 MPa |
Applications
FAQ
Styrene evaporation from the open bath gradually increases viscosity over time. Mitigate this by: (1) Covering the bath edges where possible. (2) Adding small amounts of fresh resin to compensate for styrene loss (maintain bath level). (3) Using a slightly higher initial inhibitor level (contact supplier for extended bath stability grades). (4) Running bath temperature at 18-22°C — avoid high temperature workshops. Monitor viscosity with a Zahn cup every 30-60 minutes.
Direct Contact
💬WhatsApp +86 156 3910 0440Telegram +86 156 3910 0440✉️[email protected]Reply within 24 hours
Related Products
Pultrusion Grade UPR
CAS 26455-61-8
Low viscosity for fast fiber wet-out
Chemical/Corrosion-Resistant UPR
CAS 26455-61-8
High chemical and corrosion resistance across broad pH range
Pipe and Tank Grade UPR
CAS 26455-61-8
Qualified to AWWA C950, ASTM D2992, ISO 14692
Filament Winding Vinyl Ester Resin
CAS 3066-71-5
Extended bath stability (4-8h) for continuous winding runs