Electric Motor Reliability with Huntsman ARALDITE® Encapsulation Potting – Casting
Electric Motor Reliability with Huntsman ARALDITE® Encapsulation Potting – Casting
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• Item Name: 3M™ Scotch-Weld™ Epoxy Adhesive DP420
• Manufacturer: 3M
• Technologies: Two-part, high-strength epoxy adhesive
• Color: Black, Off-White, Low Halogen Black
• Cure Type: Ambient temperature, 20-minute worklife
• Package Size: 50 mL, 200 mL, 400 mL cartridges
• Shelf Life: 15 months (bulk: 2 years)
3M™ Scotch-Weld™ Epoxy Adhesive DP420 Series are high-performance, two-part structural epoxies. They offer high shear and peel strength, excellent durability, and outstanding resistance to environmental exposure. The products are designed for tough bonding applications across metals, plastics, composites, and more.
Variants:
DP420 Black – standard black epoxy adhesive
DP420 NS Black – non-sag version with controlled flow
DP420 Off-White – off-white adhesive, UL 94 HB flammability rated
DP420 LH – low-halogen content (IEC 61249-2-21 compliant)
Key Features:
High shear and peel strength
Excellent environmental resistance
20-minute work life (varies by mass)
Easy mixing with 2:1 ratio
Multiple packaging and dispensing options (EPX cartridge system)
Structural bonding in transportation, aerospace, electronics, and general industry
Bonding metals, plastics (ABS, PVC, polycarbonate), FRP, phenolics, rubbers
Applications requiring durability under temperature cycling, moisture, and chemical exposure
Uses where flame retardancy (UL 94 HB) or low-halogen compliance is required
| Property | DP420 Black | DP420 NS Black | DP420 Off-White | DP420 LH |
|---|---|---|---|---|
| Viscosity Base (23 °C) | 20,000–50,000 cP | 190,000–270,000 cP | 20,000–50,000 cP | 20,000–50,000 cP |
| Viscosity Accelerator (23 °C) | 8,000–14,000 cP | 60,000–130,000 cP | 8,000–14,000 cP | 8,000–14,000 cP |
| Mix Ratio (B:A, Volume) | 2:1 | 2:1 | 2:1 | 2:1 |
| Mix Ratio (B:A, Weight) | 2:0.97 | 2:0.97 | 2:0.97 | 2:0.97 |
| Work Life @ 23 °C (20 g) | ~15 min | ~15 min | ~15 min | ~15 min |
| Work Life @ 23 °C (5 g) | ~30 min | ~30 min | ~30 min | ~30 min |
| Color (Base / Accelerator) | Black / Amber | Black / Amber | White / Amber | White / Amber |
| Property | DP420 Black | DP420 Off-White |
|---|---|---|
| Color | Black | Opaque Off-White |
| Shore D Hardness | 75–80 | 75–80 |
| Coefficient of Thermal Expansion (Below Tg) | 80 × 10⁻⁶ in/in/°C | 85 × 10⁻⁶ in/in/°C |
| Coefficient of Thermal Expansion (Above Tg) | 194 × 10⁻⁶ in/in/°C | 147 × 10⁻⁶ in/in/°C |
| Thermal Conductivity @ 45 °C | 0.104 BTU·ft/ft²·hr·°F | 0.104 BTU·ft/ft²·hr·°F |
| Dielectric Strength | 888 V/mil | 690 V/mil |
| Volume Resistivity | 1.6 × 10¹⁵ Ω·cm | 1.3 × 10¹⁴ Ω·cm |
| Substrate (Surface Prep) | DP420 Black (PSI) | DP420 Off-White (PSI) | DP420 NS Black (PSI) |
|---|---|---|---|
| Aluminum (Etched) | 4500 | 4500 | 4500 |
| CRS – MEK/abrade/MEK | 2200 | 2700 | 2500 |
| Copper – MEK/abrade/MEK | 5000 | 4000 | 3000 |
| Brass – MEK/abrade/MEK | 2800 | 4100 | 3500 |
| Stainless Steel – MEK/abrade/MEK | 1800 | 1700 | 3900 |
| ABS | 450–870 | 320–500 | 550–870 |
| PVC | 220–400 (substrate fail) | 220–360 (substrate fail) | NT |
| Polycarbonate | 440 | 400–550 | 470 |
| FRP | 600–1100 | 350–1300 | 3700 |
Electric Motor Reliability with Huntsman ARALDITE® Encapsulation Potting – Casting
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