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 925/1 M
• Manufacturer: WEVO-CHEMIE GmbH
• Technologies: Solventless two-component polyurethane with non-abrasive filler, degassed resin
• Color: PU 925/1 M – Black or as requested, Hardener 600 – Dark brown
• Cure Type: Ambient temperature curing, final hardness in 10 days
• Package Size: 1 kg, 5 kg, 10 kg, 30 kg buckets and 250 kg drums
• Shelf Life: 6 months
WEVO-Casting Resin PU 925/1 M is a solventless, two-component polyurethane encapsulating system with a degassed, non-abrasive filler. It is formulated for use in electrical applications where low to medium voltage insulation is required. Once cured, the polymer exhibits elastic-tough mechanical behavior, reliable adhesion to diverse substrates, and stable thermal cycling resistance. The usable temperature range is -40 °C to +120 °C. The resin is processed together with WEVO-Hardener 600.
Encapsulation of power and instrument transformers.
Electrical insulation for capacitors and electronic components.
Suitable for low and medium-voltage protection requiring good dielectric strength, thermal stability, and durability.
| Property | Casting Resin PU 925/1 M (Unmixed) | Hardener 600 (Unmixed) | Mixed System |
|---|---|---|---|
| Appearance | Black (customizable) | Dark brown | Black or as requested |
| Viscosity (22 °C) | 1200–1800 mPa·s | 420–520 mPa·s | 850–1100 mPa·s |
| Density (22 °C) | 1.21–1.24 g/cm³ | 1.20–1.24 g/cm³ | – |
| Mixing Ratio (by weight) | 100 parts | 30–33 parts | – |
| Pot life (200 g, RT) | – | – | ~45 min |
| Curing time | – | – | 18 h at 25 °C / 4 h at 60 °C / 120 min at 80 °C (final hardness 10 days) |
| Shore Hardness | – | – | 80 A / 30 D |
| Tear Resistance | – | – | 8 MPa |
| Tensile Strength | – | – | 14 MPa |
| Thermal Conductivity | – | – | 0.38 W/m·K |
| Coefficient of Expansion | – | – | 118 × 10⁻⁶ K⁻¹ (20–100 °C) |
| Glass Transition Temp. | – | – | -18 °C |
| Dielectric Strength | – | – | 25 kV/mm |
| Volume Resistivity | – | – | 1.3×10¹¹ Ω·cm (RT), lower at humidity/water immersion |
| Surface Resistivity | – | – | 6×10¹³ Ω (RT), variable with humidity |
| Dielectric Constant ε | – | – | 6.33 (50 Hz, 23 °C) |
| Dissipation Factor tan δ | – | – | 0.068 (50 Hz, 23 °C) |
| Thermal Class | – | – | – (meets CTI 600, UL tracking resistance) |
| Flammability | – | – | UL94 HB |
Electric Motor Reliability with Huntsman ARALDITE® Encapsulation Potting – Casting
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