Filament Winding Vinyl Ester Resin
Key Features
- Extended bath stability (4-8h) for continuous winding runs
- Superior chemical resistance vs. isophthalic UPR wound pipe
- Low viscosity for efficient fiber wet-out in winding bath
- HDT 110-130°C for moderate to high temperature service
- Fully compatible with AWWA C950 and ISO 14692
Filament Winding Vinyl Ester Resin is a bisphenol A-based vinyl ester optimized for the continuous filament winding process, providing the chemical resistance of vinyl ester in filament-wound pressure pipes, chemical tanks, and cylindrical vessels. The resin is formulated at 150-280 mPa·s viscosity at 25°C for minimal resistance in the resin bath and efficient fiber bundle wet-out during winding at production speeds.
Bath stability is a key performance parameter: the resin maintains viscosity below 500 mPa·s for 4-8 hours in an open resin bath at ambient temperature, enabling production runs without resin replacement. Gel time with 1.5% MEKP is 35-70 minutes at 25°C, providing a comfortable processing window. The resin is post-cured at 80°C for 2-4 hours to fully develop chemical resistance and HDT of 110-130°C.
The chemical resistance of filament-wound vinyl ester structures exceeds that of isophthalic UPR wound pipe in essentially all media categories: concentrated acids, alkalis, organic solvents, and oxidizers. Applications include chemical plant pipe headers, storage vessel shells, FRP pressure accumulators, and transportation tanker liners.
Specifications
| Parameter | Value |
|---|---|
| Appearance | Clear to pale yellow liquid |
| Bath Stability | 4-8 hours |
| Density (25°C) | 1.03-1.06 g/cm³ |
| Viscosity (25°C) | 150-280 mPa·s |
| Chemical Resistance | Superior to isophthalic UPR |
| HDT (post-cured 80°C/4h) | 110-130°C |
| Gel Time (25°C, 1.5% MEKP) | 35-70 min |
Applications
FAQ
Vinyl ester filament-wound pipes and vessels are typically wound at 60-70% fiber volume fraction (Vf). At Vf = 65%, hoop tensile strength of cured laminates is 400-600 MPa and axial tensile strength is 150-250 MPa (for ±55° winding). Higher Vf increases strength but requires lower resin bath viscosity and slower winding speed to maintain wet-out quality. Bath temperature control (20-25°C) is critical for consistent viscosity.
Direct Contact
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Qualified to ASTM D2996/D2997, ISO 14692 pipe standards