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® AV 4738 / Hardener HV 4739
Manufacturer: Huntsman Advanced Materials
Technologies: Epoxy paste adhesive, ambient temperature curing
Color: AV 4738 – Light grey, HV 4739 – Pale grey, Mixed – Grey
Cure Type: Ambient temperature curing with optional post-cure at elevated temperatures (80–130°C)
Package Size: Contact to Techniq VN for details.
Shelf Life: Contact to Techniq VN for details.
Araldite® AV 4738 with Hardener HV 4739 is a two-component epoxy paste adhesive designed for structural bonding of metals and composites. It cures at ambient temperature and can be post-cured to enhance mechanical strength, chemical resistance, and temperature resistance (up to 150 °C). The adhesive is a non-flowing, gap-filling paste suitable for both manual and mechanical application.
Bonding metals and reinforced composites such as GRP, GRE, ABS, SMC.
Composite pipe bonding.
High-strength structural joints requiring chemical resistance.
Situations requiring gap filling and non-sag application.
Potable water applications (KIWA approval filed).
| Component | Appearance | Density (g/cm³) | Viscosity (25 °C) |
|---|---|---|---|
| Araldite® AV 4738 (Resin) | Light grey thixotropic paste | 1.45 – 1.55 | 500 – 800 Pa·s |
| Hardener HV 4739 | Pale grey thixotropic paste | 1.75 – 1.85 | 34 – 64 Pa·s |
| Mixed adhesive | Grey paste | ~1.6 | — |
Mixing Ratio:
By weight → 100 : 25–27.5
By volume → 100 : 22–23
(100:27.5 by weight increases glass transition temperature slightly)
| Property | Condition | Value |
|---|---|---|
| Pot life | 100 g at 25 °C | 40 – 50 min |
| Gel time | 40 °C | 40 – 50 min |
| Lap shear strength on aluminium | 23 °C, 24h cure | > 10 MPa |
| Glass transition temperature (Tg ½) | — | ≥ 120 °C |
| Minimum shear strength | 25 °C cure, 3h | > 1 N/mm² |
| Minimum shear strength | 60 °C cure, 15 min | > 1 N/mm² |
Curing Schedules:
Ambient cure: good performance after 24h at 23 °C.
Recommended post-cure: 2 h at 80 °C or 1 h at 120 °C (or in-service post-cure).
| Property | Condition | Value |
|---|---|---|
| Lap shear strength (metals, ISO 4587) | Al, Steel, Stainless Steel, Cu, Brass | 15 – 25 N/mm² |
| Lap shear strength (plastics, ISO 4587) | PVC, Acrylic, ABS, SMC, PC | 5 – 10 N/mm² |
| Roller peel test (ISO 4578) | Al, 7d cure + post-cure | 2.6 – 5.6 N/mm |
| Lap shear vs. temperature | 23–120 °C | 8 – 18 N/mm² |
| Lap shear after chemical immersion (90 days at 23 °C) | Water, acids, oils, methanol, etc. | 5 – 15 N/mm² (depending on medium) |
| Lap shear vs. tropical weathering (90 days) | Retains ~70–80% strength | |
| Lap shear vs. water immersion (GRE substrates) | Up to 2000 h at 23 °C–100 °C | Maintains good adhesion |
Electric Motor Reliability with Huntsman ARALDITE® Encapsulation Potting – Casting
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