Electric Motor Reliability with Huntsman ARALDITE® Encapsulation Potting – Casting
Electric Motor Reliability with Huntsman ARALDITE® Encapsulation Potting – Casting
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• Item Name: WEVO-Casting Resin PU 403
• Manufacturer: WEVO-CHEMIE GmbH
• Technologies: Solventless two-component polyurethane with non-abrasive filler, degassed resin
• Color: PU 403 – Black or as requested, Hardener 300 – Brown
• Cure Type: Ambient temperature curing, final hardness in 10–14 days
• Package Size: 1 kg, 5 kg, 10 kg, 30 kg buckets and 250 kg drums
• Shelf Life: 6 months
WEVO-Casting Resin PU 403 is a solventless two-component polyurethane casting system filled with non-abrasive mineral filler and degassed for consistent quality. Once cured, it provides high thermal conductivity, stability at elevated temperatures, and good flexibility at low temperatures. It is suitable for thermal class F applications with a temperature range of -50 °C to +165 °C. The resin is processed with WEVO-Hardener 300.
Encapsulation of power and instrument transformers.
Casting of capacitors, relays, and sensors.
Electrical applications requiring both thermal management and mechanical strength.
| Property | PU 403 (Unmixed) | Hardener 300 (Unmixed) | Mixed System |
|---|---|---|---|
| Appearance | Black or as requested | Brown | Black |
| Viscosity (22 °C) | 20,000–30,000 mPa·s | 70–120 mPa·s | 2,500–3,500 mPa·s |
| Density (22 °C) | 1.74–1.80 g/cm³ | 1.20–1.22 g/cm³ | – |
| Mixing Ratio (by weight) | 100 parts | 14 parts | – |
| Pot life (250 g, RT) | – | – | 30–40 min |
| Curing time | – | – | ~12 h at RT (final hardness 10–14 days) |
| Shore Hardness | – | – | 68 D |
| Tensile Strength | – | – | 26 N/mm² |
| Elongation at Break | – | – | 15 % |
| Thermal Conductivity | – | – | 0.68 W/m·K |
| Coefficient of Expansion | – | – | 90×10⁻⁶ K⁻¹ (20–100 °C) |
| Glass Transition Temp. | – | – | 50 °C |
| Thermal Index | – | – | 165 °C (Class F) |
| Dielectric Strength | – | – | 23 kV/mm |
| Volume Resistivity | – | – | 1×10¹⁴ Ω·cm (RT) |
| Surface Resistivity | – | – | 1×10¹³ Ω (RT) |
| Dielectric Constant ε | – | – | 6.0 (50 Hz), 5.8 (1 kHz), 5.5 (1 MHz) |
| Dissipation Factor tan δ | – | – | 0.05 (50 Hz), 0.07 (1 kHz & 1 MHz) |
| Comparative Tracking Index | – | – | CTI 600 |
Electric Motor Reliability with Huntsman ARALDITE® Encapsulation Potting – Casting
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