• Item Name: Elan-tron® PU 4254 FR / PH 4900
• Manufacturer: ELANTAS Beck GmbH
• Technologies: Filled, medium-hard polyurethane, UL 94 V0 recognized, water and chemical resistant, low shrinkage
• Color: Resin – Black, Hardener – Brown transparent
• Cure Type: Room temperature (6–8 h) with post-cure recommended (24 h/23°C + 16 h/80°C)
• Package Size: Contact to Techniq VN for details.
• Shelf Life: 6 months
Elan-tron® PU 4254 FR combined with Hardener PH 4900 is a medium-hard polyurethane casting compound recognized under UL 94 V0 (file E140720). It demonstrates excellent resistance to water, hydrolysis, chemicals, transformer oil, heating oil, and fuel. The system features low shrinkage, medium processing viscosity, good dielectric properties, and high adhesion. Classified as Insulating Material Class B (130°C), it complies with RoHS requirements and provides reliable electrical insulation performance.
This polyurethane system is specifically formulated for casting small and medium-sized transformers, ensuring durability and electrical stability. It is also well-suited for underwater pump applications such as aquarium and garden pumps, where hydrolysis and water resistance are crucial. The UL 94 V0 flammability compliance further supports its use in demanding electrical and electronic insulation environments.
| Property | Resin (PU 4254 FR) | Hardener (PH 4900) |
|---|---|---|
| Appearance | Black resin | Brown transparent |
| Viscosity at 25°C (mPa·s) | 6500 ±1500 | 110 ±30 |
| Density at 20°C (g/cm³) | 1.57 ±0.05 | 1.23 ±0.05 |
| Shelf Life (23°C) | 6 months | 6 months |
| Property | Value |
|---|---|
| Mix Ratio (by weight) | 100:20 |
| Mixed Viscosity at 23°C (mPa·s) | 2500–2900 |
| Processing Time (200 g mix, 23°C) | 40–50 min |
| Curing (Room Temp) | 6–8 h (full properties after 3–4 days) |
| Post-Cure Recommended | 24 h at 23°C + 16 h at 80°C |
| Property | Value |
|---|---|
| Specific Gravity (20°C) | 1.64 ±0.05 g/cm³ |
| Hardness (Shore D) | 80 ±10 |
| Tensile Strength | 23.4 MPa |
| Tensile Modulus | 1230 MPa |
| Elongation at Break | 11% |
| Flexural Strength | 48 MPa |
| Thermal Conductivity | 0.58 W/m·K |
| Glass Transition Temperature | 30°C |
| Thermal Index (IEC 216) | 139°C |
| Volume Resistivity | 2.1×10¹⁵ Ω·cm (RT) / 4.6×10¹⁰ Ω·cm (7d water) |
| Dielectric Strength | 30 kV/mm |
| Dielectric Constant (23°C, 50 Hz) | 3.8 |
| Dissipation Factor (50 Hz) | 0.02 |
| Tracking Resistance (CTI) | >600 |
| Water Absorption (24h RT) | 0.25% |
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