Glass-reinforced Unsaturated Polyester Laminate (UP GM 203)
Brand: ISOVAL® GPO3 — Isovolta, Ryertex® GPO3 — The Gund Company, Glastic® — Röchling
Standards: IEC 60893 UP GM 203, NEMA LI 1 GPO-3, UL 94 V-0
GPO-3 (Glass Polyester Laminate, UP GM 203) is a fiberglass-reinforced thermoset composite with excellent arc and track resistance, superior to FR4 for high-voltage applications. UL 94 V-0 flame retardant. Used in electrical distribution systems, switchgear, transformer barriers and bus bar supports. The red colour is standard; white is also available. Better arc resistance than epoxy laminates (FR4/G10).
Guideline values from manufacturer datasheet. Actual values may vary by grade and dimensions.
| Property | Value | Unit |
|---|---|---|
| Density | 1.82 | g/cm³ |
| Tensile Strength (Yield) | 100 | MPa |
| Tensile Modulus (E) | 8500 | MPa |
| Shore Hardness | 85 | Scale D |
| Service Temp. Long-term | -30 … 140 | °C |
| Water Absorption | 0.20 | % |
| Flammability (UL94) | V0 | |
| Dielectric Strength | 15 | kV/mm |
Disclaimer: The technical data and information provided on this page are for reference and general guidance purposes only. They are based on manufacturer datasheets and standard testing conditions. Material properties can vary depending on dimensions, machining, and specific application environments. MaterialCut does not guarantee the accuracy of this data for specific use cases. For exact specifications and critical applications, please consult the original manufacturer datasheets or contact our technical team.
