Item Name: WEVOPUR 71/40 M
Manufacturer: WEVO-CHEMIE GmbH
Technologies: Two-component polyurethane with non-abrasive mineral fillers
Color: WEVOPUR 71/40 M – Black or as requested, WEVONAT 300 M – Brown
Cure Type: Ambient temperature curing (12–24 hours)
Package Size: 10 kg and 30 kg buckets; 250 kg drums
Shelf Life: 6 months
WEVOPUR 71/40 M is a two-component polyurethane encapsulating system with very low viscosity, formulated with non-abrasive mineral fillers. The cured polymer is tough, electrically insulating, and has high dielectric strength. It is used with WEVONAT 300 M. Temperature range: -40°C to +130°C (can be used down to -50°C for specific applications).
Encapsulation of electrical components for medium and high voltage applications.
Suitable for transformers, coils, sensors, and other electronic assemblies requiring high dielectric performance.
| Property | Resin / Hardener | Mixed System |
|---|---|---|
| Mixing ratio (by weight) | 100 parts WEVOPUR 71/40 M : 35 parts WEVONAT 300 M | — |
| Viscosity (22°C) | Resin: 2,300–3,500 mPa·s / Hardener: 100–170 mPa·s | 1,000–1,400 mPa·s |
| Density (22°C) | Resin: 1,36–1,39 g/cm³ / Hardener: 1,20–1,24 g/cm³ | — |
| Colour | Resin: black or as requested / Hardener: brown | — |
| Pot life (60 g at RT) | — | ca. 20 min |
| Curing time | — | 12–24 h at RT |
| Shore hardness D | — | 80–85 |
| Tensile strength | — | 16 N/mm² |
| Elongation at break | — | 53% |
| Modulus of elasticity | — | 737 N/mm² |
| Thermal conductivity | — | 0.36 W/m·K |
| Glass transition temperature | — | 41°C |
| Coefficient of thermal expansion | — | 90 ppm/K (< -10°C), 194 ppm/K (> +5°C) |
| Thermal class | — | B |
| Water absorption (30 days) | — | Not specified |
| Flammability | — | HB (UL94) |
| Dielectric strength | — | 39 kV/mm |
| Volume resistivity | — | 10¹⁴ Ω·cm |
| Surface resistance | — | 10¹⁶ Ω |
| Dielectric constant ε | — | 3.8 (50 Hz) |
| Dissipation factor tan δ | — | 0.02 (50 Hz) |
| Comparative tracking index | — | 600 |
| Packaging | — | 10, 30 kg buckets; 250 kg drums |
| Shelf life | — | 6 months (closed, dry storage 15–25°C) |
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