Electric Motor Reliability with Huntsman ARALDITE® Encapsulation Potting – Casting
Electric Motor Reliability with Huntsman ARALDITE® Encapsulation Potting – Casting
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Item Name: Araldite® MY 740 / Aradur® HY 906 / DY 070
Manufacturer: Huntsman Advanced Materials
Technologies: Epoxy resin + anhydride hardener + amine accelerator
Color: Contact to Techniq VN for details.
Cure Type: Hot-curing
Package Size: Contact to Techniq VN for details.
Shelf Life: Contact to Techniq VN for details.
Araldite® MY 740 / Aradur® HY 906 / Accelerator DY 070 is a hot-curing, low-viscosity impregnating epoxy resin system designed for electrical insulation. It combines good mechanical and dielectric properties with excellent aging resistance. The system is based on:
Araldite® MY 740 (epoxy resin, 100 pbw)
Aradur® HY 906 (hardener, 95 pbw)
Accelerator DY 070 (1.2 pbw).
It is solvent-free, moisture-sensitive (especially HY 906), and requires controlled storage.
Manufacture of electrical laminates (tubes, rods, laminates).
Impregnation of high-voltage bushings and coils.
Processing methods:
Filament winding
Pultrusion
Wet laminating
Trickle impregnation
| Component | Property | Value / Range | Standard |
|---|---|---|---|
| Araldite® MY 740 | Viscosity (25°C) | 10,000 – 14,500 mPa·s | ISO 12058 |
| Epoxy content | 5.25 – 5.55 equiv/kg | ISO 3001 | |
| Density (25°C) | 1.15 – 1.20 g/cm³ | ISO 1675 | |
| Flash point | >200 °C | ISO 1523 | |
| Aradur® HY 906 | Viscosity (25°C) | 175 – 350 mPa·s | ISO 12058 |
| Density (25°C) | 1.20 – 1.25 g/cm³ | ISO 1675 | |
| Flash point | >135 °C | ISO 1523 | |
| Accelerator DY 070 | Viscosity (25°C) | <50 mPa·s | ISO 2555 |
| Density (25°C) | 0.95 – 1.05 g/cm³ | ISO 1675 | |
| Flash point | 92 °C | ISO 1523 |
| Property | Value / Range | Standard |
|---|---|---|
| Mechanical Properties | ||
| Tensile strength | 75 – 85 MPa | ISO 527 |
| Elongation at break | 3.5 – 4.5 % | ISO 527 |
| Tensile modulus | 3,000 – 4,000 MPa | ISO 527 |
| Flexural strength | 140 – 150 MPa | ISO 178 |
| Flexural strain | 5.5 – 6.5 % | ISO 178 |
| Flexural modulus | 2,500 – 3,500 MPa | ISO 178 |
| Critical stress intensity factor (KIC) | 0.5 – 0.7 MPa·m½ | CG 216-0/89 |
| Specific energy at break (GIC) | 70 – 100 J/m² | CG 216-0/89 |
| Glass transition temperature (Tg) | 165 – 175 °C | ISO 11357-2 |
| Coefficient of linear thermal expansion | 65 – 70 × 10⁻⁶/K | ISO 11359-2 |
| Thermal conductivity | 0.15 – 0.20 W/m·K | ~ISO 8894-1 |
| Water absorption (10 d/23°C) | 0.50 – 0.60 % | ISO 62 |
| Water absorption (60 min/100°C) | 0.20 – 0.25 % | ISO 62 |
| Decomposition temperature | ~350 °C | DTA |
| Electrical Properties | ||
| Breakdown strength | 22 – 26 kV/mm | IEC 60243-1 |
| HV arc resistance | 70 – 80 s | IEC 61621 |
| Tracking resistance (solution A, B) | CTI > 600 | IEC 60112 |
| Dielectric constant (50 Hz, 25°C) | ~5.5 – 6.0 | IEC 60250 |
| Dielectric loss factor (tan δ, 50 Hz) | Low (temperature-dependent) | IEC 60250 |
| Volume resistivity | 10¹³ – 10¹⁵ Ω·cm | IEC 60093 |
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