UP vs EP vs PU Pultrusion — Selection Guide
Three resin systems, three different performance and cost targets. Match the system to your load, environment and budget.
Process & Performance Comparison
| Dimension | UP pultrusion | EP pultrusion | PU pultrusion |
|---|---|---|---|
| Resin chemistry | Unsaturated polyester, peroxide cure | Epoxy + amine hardener | Reactive two-component PU |
| Wet-out | Open resin bath | Open resin bath | Metered dosing / reactive injection |
| Die temperature (typical) | ~140–160 °C | ~160–180 °C | Segmented, tightly controlled |
| Line speed | Fast, cost-effective | Slower | Precision dosing window |
| Mechanical level | Balanced | Highest strength/stiffness, best adhesion | High toughness & fatigue |
| Glass loading | 60–75 wt% | 65–80 wt% | 70–85 wt% |
| Relative cost | Lowest | Higher | Mid-high |
| Best-fit use | General framing, electrical, doors/windows | Structural bonded/bolted sections | High-load & wear surfaces, rails |
Industry-typical reference values, subject to our confirmed products and mill test reports. Do not treat as guaranteed specification.
Typical Mechanical Ranges
| Property (longitudinal, E-glass) | UP | EP | PU |
|---|---|---|---|
| Tensile strength (MPa) | 250–500 | 400–700 | 350–600 |
| Tensile modulus (GPa) | 20–30 | 30–45 | 25–35 |
| Flexural strength (MPa) | 200–450 | 350–600 | 300–500 |
| Flexural modulus (GPa) | 15–25 | 25–35 | 20–30 |
| Barcol hardness | 35–55 | 40–55 | 40–60 |
Industry-typical reference values, subject to our confirmed products and mill test reports. Do not treat as guaranteed specification.
Standards We Reference
| Standard | Title / status |
|---|---|
| EN 13706-1/2/3 | Pultruded profiles — designation, test methods, specific requirements (E23/E40 grades) |
| GB/T 31539-2015 | Pultruded FRP structural profiles |
| JC/T 941-2016 | Pultruded GFRP profiles for doors and windows |
| GB/T 1447 / GB/T 1449 | Tensile / flexural test methods |
| ISO 14125:1998 (+Amd 1:2011) | Flexural properties of FRP composites |
| ASTM D3917 | Dimensional tolerance of pultruded shapes (active) |
Standards above are industry-common references; our products’ actual compliance is stated on the mill test report. Certificates we hold are listed separately once verified.【TBD】
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