Electric Motor Reliability with Huntsman ARALDITE® Encapsulation Potting – Casting
Electric Motor Reliability with Huntsman ARALDITE® Encapsulation Potting – Casting
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1. Product Overview LOCTITE® AA 3342™ is a one-component modified acrylic adhesive designed for fast fixture speed on activated surfaces. It offers high tensile strength while maintaining impact and high-temperature resistance. The adhesive is particularly suited for bonding ferrites into motor cans and structural bonding of small rigid parts of dissimilar materials.
2. Applications
3. Typical Properties
| Property | Value |
|---|---|
| Uncured Properties | |
| Appearance | Dark yellow/brown liquid |
| Specific Gravity @ 25°C | 1.085 |
| Viscosity (Brookfield – HBT, 25°C) | 80,000 to 230,000 mPa·s (spindle TB, 2.5 rpm) |
| Viscosity (Brookfield – HBT, 25°C) | 50,000 to 130,000 mPa·s (spindle TB, 20 rpm) |
| Cure Method | Activator or heat |
| Property | Value |
| Curing Performance | |
| Fixture Time on Grit-Blasted Mild Steel (Activator 7380™ on one side) | ≤200 sec |
| Fixture Time on Steel (0.05 mm gap) | ≤3.5 min |
| Fixture Time on Steel (0.5 mm gap) | 10-15 min |
| Heat Cure Conditions | 120°C for 30 min |
| Property | Value |
| Cured Properties (30 min @ 120°C, 0.5 mm film, Activator 7380™ on both sides) | |
| Glass Transition Temperature (Tg) | 80°C |
| Thermal Expansion Coefficient | 70×10⁻⁶ K⁻¹ |
| Thermal Conductivity | 0.3 W/(m·K) |
| Shore Hardness (Durometer D) | 71 |
| Tensile Strength (ISO 527-3) | 9.9 N/mm² (1,435 psi) |
| Tensile Modulus (ISO 527-3) | 478 N/mm² (69,000 psi) |
| Elongation at Break | 2.8% |
| Property | Value |
| Electrical Properties (Cured for 24 hours @ 22°C) | |
| Volume Resistivity (IEC 60093) | 18×10¹⁴ Ω·cm |
| Surface Resistivity (IEC 60093) | 62×10¹⁵ Ω |
| Dielectric Constant (1 kHz) | 2.44 |
| Dielectric Constant (10 MHz) | 2.46 |
| Property | Value |
| Mechanical Performance | |
| Lap Shear Strength (GBMS, Activator 7380™, 0 mm gap) | ≥12 N/mm² (≥1,740 psi) |
| Lap Shear Strength (GBMS, Activator 7380™, 0.5 mm gap) | ≥10 N/mm² (≥1,450 psi) |
| Lap Shear Strength (Steel, 72h @ 22°C) | 15-29 N/mm² (2,180-4,200 psi) |
| Lap Shear Strength (Zinc Dichromate, 72h @ 22°C) | 10-18 N/mm² (1,450-2,610 psi) |
| Compressive Shear Strength (Steel Pins/Collars) | 5.5-10 N/mm² (800-1,450 psi) |
| Tensile Strength (Steel Pin) | 4-12 N/mm² (580-1,740 psi) |
| “T” Peel Strength (Aluminum, Grit Blasted) | 0.7-2.5 N/mm (4-14 lb/in) |
| Property | Value |
| Environmental Resistance | |
| Hot Strength (100°C) | Retains ~75% of initial strength |
| Heat Aging (100°C, 150°C, 180°C) | Maintains structural integrity over 1000h |
| Chemical Resistance (1000h, Various Conditions) | Retains 85-95% of initial strength |
Electric Motor Reliability with Huntsman ARALDITE® Encapsulation Potting – Casting
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