• Item Name: WEVOPUR 390
• Manufacturer: WEVO-CHEMIE GmbH
• Technologies: Two-component polyurethane system with mineral filler, halogen-free, heavy metal-free, self-extinguishing properties
• Color: Resin – black or as requested, Hardener – dark brown
• Cure Type: Ambient temperature, 12–24 hours; pot life 35–50 minutes at room temperature
• Package Size: 5 kg, 10 kg, 30 kg buckets; 250 kg drums
• Shelf Life: 6 months
WEVOPUR 390 is a two-component polyurethane encapsulating system containing mineral fillers that provide self-extinguishing properties. The resin contains no halogenated flame-retardants, heavy metals, or chlorofluorocarbons. It achieves UL 94 V-2 at 1.5 mm thickness and is approved under File No. E108835. The cured polymer exhibits excellent flexibility at low temperatures, thermal endurance, and performance in thermal shock tests. Service temperature ranges from -40°C to +130°C. The resin is processed with WEVONAT 300 M, with adjustable pot life and curing time.
Encapsulation of electrical components for low and medium voltage applications.
Suitable for sensors, coils, and PCBs.
Provides flame retardancy, flexibility, and thermal resistance.
| Property | Still not mixed (WEVOPUR 390 / WEVONAT 300 M) | After mixed |
|---|---|---|
| Viscosity (22°C) | Resin: 1,600–2,400 mPa·s / Hardener: 100–170 mPa·s | 900–1,200 mPa·s |
| Density (22°C) | Resin: 1.28–1.31 g/cm³ / Hardener: 1.20–1.24 g/cm³ | ~1.28–1.31 g/cm³ |
| Mixing ratio (by weight) | 100 parts resin : 30 parts hardener | — |
| Pot life (250 g at RT) | — | 35–50 min |
| Curing time | — | 12–24 h at RT |
| Color | Resin: black / Hardener: dark brown | Black to dark brown |
| Hardness (Shore D) | — | 35–45 |
| Tensile strength | — | 7 N/mm² |
| Elongation at break | — | 88% |
| Modulus of elasticity | — | 15 N/mm² |
| Thermal conductivity | — | 0.4 W/m·K |
| Glass transition temperature | — | 7°C |
| Coefficient of thermal expansion | — | 80 ppm/K (< -10°C), 190 ppm/K (> +5°C) |
| Thermal class | — | B |
| Shrinkage after curing | — | — |
| Water absorption (30 days) | — | 0.3% |
| Flammability classification | — | UL94 V-2 (1.5 mm) |
| Glow wire flammability | — | 960°C (5.8–6.8 mm) |
| Dielectric strength | — | 32 kV/mm |
| Volume resistivity | — | 6.7·10¹⁴ Ω·cm |
| Surface resistance | — | 1.1·10¹⁶ Ω |
| Dielectric constant ε | — | 5.5 (50 Hz), 4.4 (1 kHz), 3.6 (1 MHz) |
| Dissipation factor tan δ | — | 0.14 (50 Hz), 0.09 (1 kHz), 0.03 (1 MHz) |
| CTI | — | 600 |
| Packaging | — | 5 kg, 10 kg, 30 kg buckets; 250 kg drums |
| Shelf life | — | 6 months in closed, dry storage (15–25°C) |
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