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 840-1
Manufacturer: Huntsman Advanced Materials (formerly Vantico Ltd)
Technologies: Two-component bisphenol A epoxy resin with polyamino hardener for casting and encapsulation
Color: Resin – Clear liquid; Hardener – Clear to pale liquid
Cure Type: Cold to warm curing (room temperature to 80 °C)
Package Size: Contact to Techniq VN for details.
Shelf Life: Contact to Techniq VN for details.
Araldite® MY 740 (resin) with Aradur™ HY 840-1 (hardener) is a liquid, low-viscosity, cold- to warm-curing epoxy impregnating and casting resin system.
Moderate reactivity, high flexibility after cure.
Suitable for Class A insulation applications (105 °C).
Good mechanical and electrical performance with low exotherm during cure.
Mix ratio: 100 pbw resin : 50–100 pbw hardener, depending on performance requirements.
Encapsulation and casting of electronic devices, especially printed wiring boards (PWBs).
Designed for casting with or without vacuum.
Useful where mechanical toughness and electrical insulation are essential.
| Property | Araldite® MY 740 (Resin) | Aradur™ HY 840-1 (Hardener) |
|---|---|---|
| Form | Clear liquid | Liquid |
| Chemistry | Bisphenol A epoxy resin | Modified polyamino curing agent |
| Viscosity (25 °C) | 10,000 – 14,500 mPa·s | 10,000 – 15,000 mPa·s |
| Viscosity (75 °C) | – | 300 – 600 mPa·s |
| Density (25 °C) | 1.15 – 1.20 g/cm³ | 0.96 – 1.0 g/cm³ |
| Epoxy content | 5.25 – 5.55 eq/kg | – |
| Vapour pressure | <0.00001 mbar | <0.01 mbar |
| Flash point | 200 °C | >140 °C |
| Property | Value |
|---|---|
| Recommended Mix Ratio | 100 : 50–70 pbw (optimum electrical) |
| Alternative Mix Ratio | Up to 100 : 100 pbw (best sealing/adhesion) |
| Initial Viscosity (25 °C / 40 °C) | 14,000 mPa·s / 2,400 mPa·s |
| Pot Life (to 50,000 mPa·s) | 80 min (25 °C), 65 min (40 °C) |
| Gel Time | 85 min (40 °C), 27 min (60 °C) |
| Recommended Cure | 8 h / 80 °C |
| Alternative Cure | 24 h / 23 °C + 8 h / 80 °C |
| Property | Value |
|---|---|
| Flexural Strength | 105 – 110 MPa |
| Surface Strain | 8.5 – 9.0 % |
| Elastic Modulus | 2,470 – 2,540 MPa |
| Shore D Hardness | 80 – 85 |
| Glass Transition Temp (Tg, DSC) | ~90 °C |
| Decomposition Temp | >300 °C |
| Property | Value |
|---|---|
| Breakdown Strength (3 mm) | 20 – 24 kV/mm |
| Dielectric Loss Factor (tan δ, 50 Hz) | 0.4 % (23 °C); 10.3 % (80 °C) |
| Dielectric Constant (εr, 50 Hz) | 2.2 (25 °C), 3.3 (80 °C) |
Electric Motor Reliability with Huntsman ARALDITE® Encapsulation Potting – Casting
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