Electric Motor Reliability with Huntsman ARALDITE® Encapsulation Potting – Casting
Electric Motor Reliability with Huntsman ARALDITE® Encapsulation Potting – Casting
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LOCTITE® 518™ is a single-component, medium-strength, anaerobic sealant that cures in the absence of air between close-fitting metal surfaces. It provides resistance to low pressures immediately after assembly and is designed for sealing rigid metal flanges, such as those in gearbox and engine casings. The product is thixotropic, reducing migration after application.
| Property | Value |
|---|---|
| Uncured Properties | |
| Chemical Type | Dimethacrylate ester |
| Appearance | Red, gel-like material |
| Fluorescence | Positive under UV light |
| Viscosity (25°C, Brookfield HBT) | 4,000,000 mPa·s |
| Cure Mechanism | Anaerobic |
| Strength | Medium |
| Gap Filling | Up to 0.25 mm (0.01 in) |
| Cured Properties (24h at 23°C) | |
| Glass Transition Temperature (Tg) | 100°C |
| Tensile Strength (ISO 527-2) | 7.3 N/mm² (1,060 psi) |
| Elongation at Break (ISO 527-2) | 64% |
| Lap Shear Strength (Steel) | 8.4 N/mm² (1,220 psi) |
| Lap Shear Strength (Aluminum) | 5.4 N/mm² (780 psi) |
| Sealing Capability | |
| Maximum Induced Gap (Steel/Aluminum) | 0.25 mm |
| Instant Pressure Resistance | 1.35 MPa (0.05 mm gap) |
| Environmental Resistance | |
| Heat Resistance | Up to 150°C |
| Cold Strength | Tested down to -75°C |
| Chemical Resistance (5000h) | Good resistance to motor oils, ATF, and glycol-water mixtures; limited resistance to gasoline |
Electric Motor Reliability with Huntsman ARALDITE® Encapsulation Potting – Casting
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