• Item Name: WEVOPUR 9251 FL
• Manufacturer: WEVO-CHEMIE GmbH
• Technologies: Two-component polyurethane system with mineral filler providing halogen-free self-extinguishing properties
• Color: Resin – black or as requested, Hardener – brown
• Cure Type: Ambient temperature, 12–24 hours; pot life 30–40 minutes at room temperature
• Package Size: 10 kg, 30 kg buckets; 250 kg drums
• Shelf Life: 6 months
WEVOPUR 9251 FL is a two-component polyurethane encapsulating system formulated with mineral fillers that provide self-extinguishing properties without halogen compounds. The resin is free of halogenated flame-retardants, heavy metals, and chlorofluorocarbons. The cured polymer exhibits tough-elastic properties, excellent adhesion to plastics, metals, and glass, and outstanding performance under thermal cycling. It achieves UL 94 V-0 rating at 6 mm thickness and is approved in black and natural colors. Service temperature ranges from -40°C to +135°C. The resin is processed with WEVONAT 300, and pot life and curing time can be accelerated as needed.
Encapsulation, sealing, or coating of electrical components.
Suitable for low and medium voltage applications, including sensors, switches, and printed circuit boards.
Provides flame retardancy, thermal stability, and electrical insulation for critical components.
| Property | Still not mixed (WEVOPUR 9251 FL / WEVONAT 300) | After mixed |
|---|---|---|
| Viscosity (22°C) | Resin: 5,200–6,000 mPa·s / Hardener: 70–120 mPa·s | 2,000–3,000 mPa·s |
| Density (22°C) | Resin: 1.53–1.56 g/cm³ / Hardener: 1.20–1.24 g/cm³ | ~1.53–1.56 g/cm³ |
| Mixing ratio (by weight) | 100 parts resin : 15 parts hardener | — |
| Pot life (100 g at RT) | — | 30–40 min |
| Curing time | — | 12–24 h at RT |
| Color | Resin: black / Hardener: brown | Black to brown |
| Hardness (Shore D) | — | 30–40 |
| Tensile strength | — | 4.5 N/mm² |
| Elongation at break | — | 40% |
| Modulus of elasticity | — | 40 N/mm² |
| Thermal conductivity | — | 0.57 W/m·K |
| Glass transition temperature | — | -26°C |
| Coefficient of thermal expansion | — | 40 ppm/K (< -30°C), 136 ppm/K (> +30°C) |
| Thermal class | — | DIN EN 60085 |
| Flammability classification | — | UL94 V-0 (6 mm) |
| Dielectric strength | — | > 20 kV/mm |
| Dielectric constant ε | — | 6.71 (50 Hz), 5.97 (1 kHz), 4.55 (1 MHz) |
| Dissipation factor tan δ | — | 0.084 (50 Hz), 0.061 (1 kHz), 0.026 (1 MHz) |
| CTI | — | 600 (DIN EN 60112) |
| Packaging | — | 10 kg, 30 kg buckets; 250 kg drums |
| Shelf life | — | 6 months in closed, dry storage (15–25°C) |
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