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GPO3 polyester glass
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- Very good tensile strength
- Possibility to cold cut up to 5 mm thick sheets
- Self-extinguishing
- Low water absorption
- Very good tracking behaviour
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Glass mat impregnated with polyester resin
The use of filament yarns boosts the mechanical properties of this material in terms of tensile strength and enables cold cutting of up to 5 mm thick sheets.
Sheets are available in 0.8 to 100 mm thickness and in the following sizes: 1000x2000 mm and 1250x2000 mm.
GPO3 is used to manufacture, for instance, pallets, washers, support bars, protection panels, rings, and gaskets that are applied to LV, MV and HV circuit breakers, electrical panels, transformers, energy and railway transport systems.
Self-extinguishing, pursuant to UL94-V0, low water absorption, very good tracking and electric arc behaviour, halogen-free, low fume emissions, low toxicity index
Insulation class: F (155 °C)
| Properties | Standard | Unit of measurement | Value |
| General | |||
| Corresponds to | CEI EN 60983 | UP GM 203 | |
| NEMA LI - 1 | GPO3 | ||
| DIN 7735 | HM 2471 | ||
| CEI 15/10 | PV | ||
| Physical properties | |||
| Colour | red or white | ||
| Specific weight | ISO 1183 | g/cm3 | 1.8 (a) |
| Water absorption | ISO 62 | mm | 3 (b) |
| % | 0.3 (d) | ||
| Insulation class | IEC 60216 | °C | F (155 °C) |
| Self-extinguishing | UL94 | V0 | |
| Thermal conductivity | ISO 8302 | W/mK | 0.3 |
| Expansion coefficient | VDE 0304/VSM | 10-6/K | 20 |
| Silicone resin content | IEC 371-2 | % | -- |
| Mica content | IEC 371-2 | % | -- |
| Mechanical properties | |||
| Flexural strength ⊥ | ISO 178 | MPa | 130 (a) |
| Charpy impact strength | ISO 179 | KJ/m2 | 35 (a) |
| Tensile strength | ISO 527 | MPa | 100 (a) |
| Compressive yield strength ⊥ | ISO 604 | MPa | 280 (a) |
| Layer detachment strength // | CEI | N | 5000 (a) |
| Dielectric | |||
| Insulation resistance | ISO 60167 | MΩ | 5x102 (d) |
| Dielectric strength // | IEC 60243-1 | KV | 40 (a) |
| Dielectric strength ⊥ | IEC 60243-1 | KV/mm | 10 (a) |
| Tracking resistance | IEC 60112 | V | 600 |
| Arc resistance | ASTM D495 | S | 180 |
Test conditions
a) 48h 15-35 °C 45/75% RH
b) 1h 105 °C
c) 24h 105 °C
d) 24h 23 °C in water
e) 48h 50 °C in water
f) 24h 120 °C in oil
g) 96h 45 °C 95% RH
These are indicative data as they represent the average values measured at the time of routine checks in production.
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