Electric Motor Reliability with Huntsman ARALDITE® Encapsulation Potting – Casting
Electric Motor Reliability with Huntsman ARALDITE® Encapsulation Potting – Casting
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LOCTITE® HHD 3542™ is a reactive polyurethane hotmelt adhesive designed for robotic dispensing. It has a long open time, solidifies quickly for good initial strength, and undergoes secondary moisture cure for enhanced durability. Once fully cured, it does not remelt.
| Property | Value |
|---|---|
| Uncured Properties | |
| Specific Gravity @ 25°C | 1.1 |
| Viscosity (Brookfield, 100°C) | 3,500 – 7,500 mPa.s |
| Flash Point | See SDS |
| Curing Characteristics | |
| Open Time @ 25°C (1mm bead) | < 4 minutes |
| Application Temperature | 90 – 110°C |
| Cured Properties | |
| Glass Transition Temperature (Tg) | -39°C |
| Coefficient of Thermal Expansion (Pre Tg) | 130 x 10⁻⁶ K⁻¹ |
| Coefficient of Thermal Expansion (Post Tg) | 340 x 10⁻⁶ K⁻¹ |
| Hardness (Shore D) | 30 |
| Thermal Conductivity | 0.21 W/(m.K) |
| Elongation at Break | 860% |
| Tensile Modulus | 91 N/mm² (13,225 psi) |
| Tensile Strength | >8 N/mm² (>1,225 psi) |
| Electrical Properties | |
| Dielectric Constant (1,000 KHz) | 3.48 |
| Test | Substrate | Strength (N/mm² / psi) |
|---|---|---|
| Lap Shear Strength | Anodized Aluminum | 7.2 / 1,045 |
| PC/ABS | 4.8 / 695 | |
| Cross Bond Tensile Loading Strength | Anodized Aluminum | 4.8 / 695 |
| PC/ABS | 5.8 / 840 |
| Condition | Aluminum (N/mm² / psi) | PC/ABS (N/mm² / psi) |
|---|---|---|
| 85°C / 85% RH (7 days) | 3.9 / 570 | 4.5 / 800 |
| Thermal Cycling | 7.2 / 1,040 | 6.4 / 935 |
| Heat Shock | 6.0 / 865 | 5.3 / 775 |
| Chemical Exposure | Retention of Strength (%) |
|---|---|
| Air (87°C, 500h/1000h) | 150 / 150 |
| Motor Oil (87°C, 500h/1000h) | 115 / 110 |
| Isopropanol (22°C, 500h/1000h) | 90 / 85 |
| Water (22°C, 500h/1000h) | 115 / 150 |
| Water/Glycol (87°C, 500h/1000h) | 130 / 140 |
Electric Motor Reliability with Huntsman ARALDITE® Encapsulation Potting – Casting
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