What is EP-GC-308?
EP-GC-308 is the high-temperature special grade of the epoxy/glass-fabric laminate series to EN 60893 for apparatus, electrical and transformer engineering at an elevated continuous-use temperature (temperature index 180).
Technical Data
| Property | Value | Test Standard |
|---|---|---|
| General Properties | ||
| Density | 1.7-1.9 (typical 1.86) g/cm³ | DIN 53479 |
| Water absorption (5 mm thickness) | 14 (DIN 7735: 30) mg | DIN 53495 |
| Glow resistance | 2a | DIN 53459 |
| Colour | brown | – |
| Mechanical Properties | ||
| Flexural strength | 630 (DIN 7735: 350) MPa | DIN 53452 |
| Flexural strength at elevated temperature | 458 (DIN 7735: 175) MPa | DIN 53452 |
| Tensile strength | 370 (DIN 7735: 220) MPa | DIN 53455 |
| Compressive strength | 330 (DIN 7735: 150) MPa | DIN 53454 |
| Impact strength | 219 (DIN 7735: 100) kJ/m² | DIN 53453 |
| Notched impact strength | 65 (DIN 7735: 50) kJ/m² | DIN 53453 |
| Bond strength (splitting force) | 4100 (DIN 7735: 3000) N | DIN 53463 |
| Modulus of elasticity | 31 · 10³ (DIN 7735: 18 · 10³) MPa | DIN 53452 |
| Thermal Properties | ||
| Temperature limit / TI | 155/180 °C | VDE 0304 / IEC 60216 |
| Thermal conductivity ∥ / ⊥ | 0.3 / 0.25 W/(m·K) | DIN 52612 |
| Coefficient of linear expansion ∥ / ⊥ | 10-20 / 15 · 10⁻⁶/K | VDE 0304 |
| Thermal class | F / H | VDE 0534 |
| Electrical Properties | ||
| Surface resistivity | 10¹² (DIN 7735: 5 · 10¹⁰) Ω | DIN 53482 |
| Electric strength ∥ / ⊥ | 90 / 70 (DIN 7735: 40 / 40) kV | DIN 53481 |
| Dielectric dissipation factor (1 MHz) | 0.03 (DIN 7735: 0.05) | DIN 53483 |
| Dielectric constant | 4 (DIN 7735: 5) | DIN 53483 |
| Comparative tracking index CTI | 250 (DIN 7735: 200) | IEC 60112 |
| Electrolytic corrosion (tracking) | AN 1.2 (DIN 7735: AN 1.4) | DIN 53489 |
EP-GC-308 in detail
1What is EP-GC-308?+
EP-GC-308 (acc. to EN 60893) is the high-temperature special grade of the epoxy/glass-fabric laminate series for apparatus, electrical and transformer engineering at an elevated continuous-use temperature. The temperature index acc. to IEC 60216-1 is 180, achieved through an adapted resin formulation that at the same time enables higher mechanical strength values. The colour is characteristically brown.
2How does Liedtke machine EP-GC-308?+
We machine precision parts from EP-GC-308 sheets, round bars and tubes. Sawing, milling, drilling and turning produce clean, dimensionally accurate results with sharp, carbide-tipped or diamond-coated tools, and we allow for the increased tool wear caused by the glass fabric while ensuring adequate dust extraction.
3When should I choose EP-GC-308?+
EP-GC-308 is worthwhile whenever a particularly high continuous-use temperature is required, for example:
- Apparatus, electrical and transformer engineering with elevated operating temperature
- Insulating parts in the immediate vicinity of heat sources
- Applications where the 130 °C or 155 °C class is thermally insufficient
4What determines the price of an EP-GC-308 part?+
The component price is determined mainly by sheet thickness, dimensions, material utilisation, machining effort and batch size. Due to the special high-temperature resin formulation, EP-GC-308 is priced above the standard and 155 °C grades of the series. We are glad to provide binding prices on request based on your drawing.
5When is EP-GC-308 not the right choice?+
EP-GC-308 is not declared for direct food contact. If the 130 °C or 155 °C class is thermally sufficient, EP GC 202 resp. EP GC 203 are the more economical choice. As a thermoset, EP-GC-308 also cannot be reshaped or welded, and a documented DIN 7735 Hgw assignment is not reliably established for this grade.
6Advantages and disadvantages of EP-GC-308+
An honest assessment, and how the disadvantages can be mitigated in practice:
- Advantage: Very high mechanical strength
- Advantage: High-temperature special grade (temperature index 180)
- Advantage: Very good electrical insulation properties
- Disadvantage: Not declared for direct food contact
- Disadvantage: Higher tool wear during machining (glass fabric)
- Disadvantage: Higher price than standard and 155 °C grades of the series
- Practical tip: EP-GC-308 is the right choice for continuous-use temperatures up to 180 °C. If 130 °C or 155 °C is sufficient, EP GC 202 resp. EP GC 203 are the more economical choice.
Typical Properties
- Very high mechanical strength
- High-temperature special grade (temperature index 180)
- Low water absorption
- Very good electrical insulation properties
- Thermoset laminate (dimensionally stable)
- Colour brown
Typical Industries
- Apparatus engineering
- Electrical engineering and switchgear construction (medium voltage)
- Transformer manufacturing
- Mechanical and plant engineering (high-strength insulating parts at elevated temperature)
- Jig, fixture and tool making
- Test and measurement engineering
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