• Item Name: WEVOPUR 552 FL
• Manufacturer: WEVO-CHEMIE GmbH
• Technologies: Two-component polyurethane system with mineral filler providing halogen-free self-extinguishing and tough-elastic properties
• Color: Resin – black or as requested, Hardener – dark brown
• Cure Type: Ambient temperature, 12–24 hours; pot life 30–50 minutes at room temperature
• Package Size: 10 kg, 30 kg buckets; 250 kg drums
• Shelf Life: 6 months
WEVOPUR 552 FL is a two-component polyurethane encapsulating system containing mineral fillers that provide self-extinguishing properties without halogenated flame-retardants. The cured polymer is tough-elastic and meets UL 94 V-0 at 1.5 mm thickness. It passes HWI, HAI, and CTI tests, with an RTI value of 130°C for mechanical and electrical strength. The resin is suitable for use from -40°C to +130°C and is processed with WEVONAT 300 M. 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 PCBs.
Provides flame retardancy, thermal stability, and electrical insulation for critical components.
| Property | Still not mixed (WEVOPUR 552 FL / WEVONAT 300 M) | After mixed |
|---|---|---|
| Viscosity (22°C) | Resin: 6,000–7,000 mPa·s / Hardener: 100–170 mPa·s | 1,200–1,600 mPa·s |
| Density (22°C) | Resin: 1.55–1.60 g/cm³ / Hardener: 1.20–1.24 g/cm³ | ~1.55–1.60 g/cm³ |
| Mixing ratio (by weight) | 100 parts resin : 20 parts hardener | — |
| Pot life (250 g at RT) | — | 30–50 min |
| Curing time | — | 12–24 h at RT |
| Color | Resin: black / Hardener: dark brown | Black to dark brown |
| Hardness (Shore D) | — | 60–70 |
| Tensile strength | — | 6 N/mm² |
| Elongation at break | — | 62% |
| Modulus of elasticity | — | 55 N/mm² |
| Thermal conductivity | — | 0.61 W/m·K |
| Glass transition temperature | — | 15°C |
| Coefficient of thermal expansion | — | 58 ppm/K (< 10°C), 142 ppm/K (> 20°C) |
| Thermal class | — | B |
| Shrinkage after curing | — | 1% |
| Water absorption (30 days) | — | 0.4% |
| Flammability classification | — | UL94 V-0 (1.5 mm) |
| Dielectric strength | — | 29 kV/mm |
| Volume resistivity | — | 10¹³ Ω·cm |
| Surface resistance | — | 10¹⁶ Ω |
| Dielectric constant ε | — | 5.6 (50 Hz), 4.6 (1 kHz), 3.7 (1 MHz) |
| Dissipation factor tan δ | — | 0.117 (50 Hz), 0.084 (1 kHz), 0.038 (1 MHz) |
| CTI | — | 600-0.1 |
| Packaging | — | 10 kg, 30 kg buckets; 250 kg drums |
| Shelf life | — | 6 months in closed, dry storage (15–25°C) |
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