Item Name: WEVOPUR PD 4
Manufacturer: WEVO-CHEMIE GmbH
Technologies: Two-component unfilled polyurethane system with excellent chemical resistance and flexibility at low temperatures
Color: Casting resin – Black or as requested; Hardener 385 – Yellowish
Cure Type: Ambient temperature curing (12–24 hours, full cure 14 days)
Package Size: 5 kg, 10 kg, 25 kg buckets; 180 kg drums
Shelf Life: 6 months
WEVOPUR PD 4 is a two-component, unfilled polyurethane encapsulating system that offers excellent chemical resistance to common acids and alkalis, along with outstanding flexibility at low temperatures. It maintains a low and stable dielectric constant across a wide frequency and temperature range, and adheres well to plastics, metals, and glass. The system is designed for use with WEVO-Hardener 385 and operates in a temperature range of -60°C to +120°C.
Encapsulation and coating of pressure-sensitive electrical and electronic components.
Suitable for sensors and SMD-equipped PCBs requiring thermal, chemical, and electrical stability.
| Property | Casting Resin PD4 | Hardener 385 | Mixture (After Mixing) |
|---|---|---|---|
| Colour | Yellowish | Black or as requested | – |
| Viscosity (22°C) | 3,200 mPa·s | 4,500 mPa·s | 1,200–1,600 mPa·s |
| Density (g/cm³) | 0.91 | 0.93 | 1.20–1.24 |
| Mixing ratio (by weight) | 100 | 34 | – |
| Pot life (200 g) | – | – | 30 min at room temperature |
| Curing time | – | – | 12–24 h at room temperature |
| Final hardness | – | – | 14 days at room temperature |
| Shore A hardness | – | – | 70–78 |
| Tensile strength | – | – | 9 N/mm² |
| Elongation at break | – | – | 210 % |
| Modulus of elasticity | – | – | 15 N/mm² |
| Thermal conductivity | – | – | 0.22 W/m·K |
| Coefficient of thermal expansion | – | – | 56 ppm/K (below Tg), 211 ppm/K (above Tg) |
| Glass transition temperature | – | – | < -60°C (TMA), > -60°C (TMA) |
| Shrinkage after curing | – | – | 0.6 % |
| Water absorption | – | – | 0.2 % (after 30 days immersion) |
| Flammability | – | – | UL 94 HB, 3 mm |
| Dielectric strength | – | – | 25 kV/mm |
| Dielectric constant (ε) | – | – | 3.1 @ 1 kHz; 3.0 @ 1 MHz |
| Dissipation factor (tan δ) | – | – | 0.014 @ 1 kHz; 0.013 @ 1 MHz |
| Volume resistance | – | – | 4.2 × 10¹⁴ Ω·cm; >10¹⁶ Ω |
| Comparative tracking index | – | – | CTI 600 |
| Packaging | 5, 10, 25 kg buckets; 180 kg drums | – | – |
| Shelf life | 6 months (15–25°C, dry storage) | 6 months (18–25°C, avoid freeze) | – |
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