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 STYCAST EE 4186 HD 3561 is a two-component epoxy system designed for encapsulation and potting applications. It features a low coefficient of thermal expansion (CTE), low shrinkage, and high impact strength, preventing microscopic cracking when flexible wire leads protrude from the encapsulation. The system adheres well to lead materials like vinyl and neoprene.
2. Applications
3. Typical Properties
| Property | Part A (Resin) | Part B (Hardener) | Mixed | Cured |
|---|---|---|---|---|
| Appearance | Tan | Tan | Tan | Tan |
| Density (g/cc, 25°C) | 1.8 | 1.01 | 2.1 | – |
| Viscosity (mPa·s, 25°C) | 150,000 | 20 | 4,000 | – |
| Filler Content (%) | 65 | – | 59 | – |
| Pot Life (200g mass, 25°C) | – | – | 80 min | – |
| Peak Exotherm Temperature (200g mass, °C) | – | – | 115°C | – |
| Cure Schedule (Recommended) | – | – | 3 hrs @ 60°C or 24 hrs @ 25°C | – |
4. Typical Properties of Cured Material
| Physical Properties | Value |
|---|---|
| Coefficient of Linear Thermal Expansion (30-70°C) | 50 x 10⁻⁶ in/in/°C |
| Coefficient of Linear Thermal Expansion (70-90°C) | 110 x 10⁻⁶ in/in/°C |
| Elongation (%) | 1.9 |
| Hardness (Shore D) | 95 |
| Heat Deflection Temperature (°C) | 85 |
| Izod Impact Strength (ft-lb/in) | 0.24 |
| Linear Shrinkage (%) | 0.31 |
| Moisture Absorption (24 hrs, %) | 0.113 |
| Thermal Conductivity (cal·cm/sec·cm²·°C) | 18 x 10⁻⁴ |
5. Electrical Properties
| Property | Value |
|---|---|
| Dielectric Strength (V/mil, 10 mil) | 1,400 |
| Dielectric Strength (V/mil, 20 mil) | 1,585 |
| Arc Resistance (sec) | 190 |
| Volume Resistivity (Ω·cm, 25°C) | 2 × 10¹⁶ |
| Volume Resistivity (Ω·cm, 80°C) | 4.6 × 10¹² |
Dielectric Constant / Dissipation Factor:
| Frequency | @ 25°C | @ 80°C |
|---|---|---|
| 100 Hz | 4.8 / 0.11 | 6.3 / 0.078 |
| 1 kHz | 4.8 / 0.008 | 5.8 / 0.052 |
| 10 kHz | 4.52 / 0.013 | 5.45 / 0.036 |
| 100 kHz | 4.6 / 0.022 | 5.21 / 0.025 |
Electric Motor Reliability with Huntsman ARALDITE® Encapsulation Potting – Casting
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