• Item Name: WEVO-Casting Resin PU 951
• Manufacturer: WEVO-CHEMIE GmbH
• Technologies: Two-component polyurethane with nonabrasive mineral filler
• Color: Dark brown or as requested
• Cure Type: Ambient temperature curing, final hardness in 14 days
• Package Size: 5 kg, 10 kg, 30 kg buckets and 250 kg drums
• Shelf Life: 6 months
WEVO-Casting Resin PU 951 is a two-component polyurethane encapsulating system filled with non-abrasive mineral fillers. After curing, the polymer demonstrates tough-elastic behavior, excellent adhesion to plastics, metals, and glass, as well as strong performance in thermal cycling tests. The material offers reliable dielectric properties, thermal stability, and flexibility. Its operating temperature range is -50 °C to +120 °C.
Encapsulation of low and medium-voltage electrical components.
Suitable for sensors, switches, and printed circuit boards (PCBs).
Provides long-term protection where adhesion, elasticity, and electrical insulation are essential.
| Property | Casting Resin PU 951 (Unmixed) | Hardener 300 (Unmixed) | Mixed System |
|---|---|---|---|
| Appearance | Dark brown / black (customizable) | – | Black or as requested |
| Viscosity (22 °C) | 1300–1600 mPa·s | 70–120 mPa·s | 1000–1300 mPa·s |
| Density (22 °C) | 1.28–1.30 g/cm³ | 1.20–1.24 g/cm³ | – |
| Mixing Ratio (by weight) | 100 parts | 14 parts | – |
| Pot life (250 g, RT) | – | – | 40–50 min |
| Curing time | – | – | 12–24 h at RT (final cure 14 days) |
| Shore Hardness | – | – | 70–75 A |
| Tensile Strength | – | – | – (per ISO 527-2, elastic behavior) |
| Elongation at Break | – | – | ~62 % (typical tough-elastic) |
| Thermal Conductivity | – | – | 0.3 W/m·K |
| Coefficient of Expansion | – | – | 62–210 ppm/K |
| Dielectric Strength | – | – | 20 kV/mm |
| Surface/Volume Resistance | – | – | 10¹⁵ Ω / 10¹³ Ω·cm |
| Thermal Class | – | – | Class E, Tg ≈ -28 °C |
| Flammability | – | – | UL94 HB, CTI 600 |
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