Electric Motor Reliability with Huntsman ARALDITE® Encapsulation Potting – Casting
Electric Motor Reliability with Huntsman ARALDITE® Encapsulation Potting – Casting
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• Item Name: Elan-tron® PU 4025 / PH 4900
• Manufacturer: ELANTAS Beck GmbH
• Technologies: Filled, soft flexible polyurethane, low shrinkage, electrical insulating, low-temperature flexibility, vibration damping
• Color: Resin – Dark blue, Hardener – Brown transparent
• Cure Type: Room temperature (6–8 h) or 90°C (1–1.5 h), post-cure recommended
• Package Size: Contact to Techniq VN for details.
• Shelf Life: 6 months
Elan-tron® PU 4025 with Hardener PH 4900 is a soft, flexible polyurethane casting compound designed for high electrical insulation with low shrinkage. Its elastic nature minimizes internal stresses caused by temperature variations, material expansion, or contraction. The formulation ensures vibration damping, resilience under mechanical stress, and durability even at low temperatures down to –40 °C. The cured system maintains good adhesion, stable dielectric properties, and thermal resistance up to 115 °C, while also meeting RoHS compliance.
The system is ideally suited for casting mechanically sensitive electrical and electronic components. It reduces material stress from shrinkage or temperature changes, making it effective for use in sensors, automotive electronics, and components exposed to vibration or acceleration forces, such as impact drills. Its vibration-damping properties also support reliability in sensitive devices requiring long-term mechanical stability.
| Property | Resin (PU 4025) | Hardener (PH 4900) |
|---|---|---|
| Appearance | Dark blue | Brown transparent |
| Viscosity at 25°C (mPa·s) | 1050 ±150 | 110 ±30 |
| Density at 20°C (g/cm³) | 1.40 ±0.05 | 1.23 ±0.05 |
| Shelf Life (23°C) | 6 months | 6 months |
| Property | Value |
|---|---|
| Mix Ratio (by weight) | 100:25 |
| Mixed Viscosity at 25°C (mPa·s) | ~800 |
| Processing Time (23°C, 15 ml) | ~150 min |
| Curing (Room Temp) | 6–8 h (full after 3–4 days) |
| Curing (90°C) | 1–1.5 h |
| Post-Cure | 12–16 h at 80°C |
| Property | Value |
|---|---|
| Specific Gravity (20°C) | 1.36 ±0.05 g/cm³ |
| Hardness | 70 ±10 Shore A |
| Tensile Strength | 3.01 MPa |
| Tensile Modulus | 8.11 MPa |
| Elongation at Break | 50% |
| Thermal Conductivity | 0.36 W/m·K |
| Glass Transition Temperature | –10 °C |
| Linear Expansion Coefficient | 216 ×10⁻⁶ K⁻¹ |
| Dielectric Strength | 22 kV/mm |
| Dielectric Constant (23°C, 50 Hz) | 4.2 |
| Volume Resistivity | 2 ×10¹³ Ω·cm |
| Tracking Resistance (CTI) | 600 |
| Water Absorption (24h RT) | 0.36% |
Electric Motor Reliability with Huntsman ARALDITE® Encapsulation Potting – Casting
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