Electric Motor Reliability with Huntsman ARALDITE® Encapsulation Potting – Casting
Electric Motor Reliability with Huntsman ARALDITE® Encapsulation Potting – Casting
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Item Name: WEVOPUR 71/60 M
Manufacturer: WEVO-CHEMIE GmbH
Technologies: Two-component polyurethane with non-abrasive mineral fillers
Color: WEVOPUR 71/60 M – Black or as requested, WEVONAT 300 – Dark brown
Cure Type: Ambient temperature curing (12–24 hours)
Package Size: 5 kg, 10 kg, 30 kg buckets; 250 kg drums
Shelf Life: 6 months
WEVOPUR 71/60 M is a two-component polyurethane encapsulating system with very low viscosity. It contains non-abrasive mineral fillers and exhibits tough cured properties with high dielectric strength. The system is used with WEVONAT 300. Service temperature ranges from -25°C to +130°C.
Encapsulation of electrical components for medium and high voltage applications.
Suitable for transformers, coils, and electronic assemblies requiring high dielectric performance.
| Property | Resin / Hardener | Mixed System |
|---|---|---|
| Mixing ratio (by weight) | 100 parts WEVOPUR 71/60 M : 25 parts WEVONAT 300 | — |
| Viscosity (22°C) | Resin: 4,000–5,500 mPa·s / Hardener: 70–120 mPa·s | 1,800–2,200 mPa·s |
| Density (22°C) | Resin: 1,62–1,66 g/cm³ / Hardener: 1,20–1,24 g/cm³ | — |
| Colour | Resin: black or as requested / Hardener: dark brown | — |
| Pot life (250 g at RT) | — | 30–40 min |
| Curing time | — | 12–24 h at RT |
| Shore hardness D | — | 82–86 |
| Tensile strength | — | 25 N/mm² |
| Elongation at break | — | 50% |
| Modulus of elasticity | — | Not specified |
| Thermal conductivity | — | 0.55 W/m·K |
| Glass transition temperature | — | 40°C |
| Coefficient of thermal expansion | — | 70 ppm/K (< -10°C), 163 ppm/K (> +5°C) |
| Thermal class | — | B |
| Water absorption (30 days) | — | 0.5% |
| Flammability | — | HB (UL94) |
| Dielectric strength | — | 30 kV/mm |
| Volume resistivity | — | 10¹⁴ Ω·cm |
| Surface resistance | — | 7·10¹³ Ω |
| Dielectric constant ε | — | 4.4 (50 Hz) |
| Dissipation factor tan δ | — | 0.027 (50 Hz) |
| Comparative tracking index | — | 600 |
| Packaging | — | 5, 10, 30 kg buckets; 250 kg drums |
| Shelf life | — | 6 months (closed, dry storage 15–25°C) |
Electric Motor Reliability with Huntsman ARALDITE® Encapsulation Potting – Casting
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