• Item Name: 3M™ Scotchcast™ Electrical Resin 3
• Manufacturer: 3M
• Technologies: Two-part, oven-curing, Class B, rigid, unfilled epoxy
• Color: Clear Amber
• Cure Type: Oven cure (120 °C: 1–2 hrs, 95 °C: 6–8 hrs, 77 °C: 12–16 hrs)
• Package Size: Contact to Techniq VN for details
• Shelf Life: Contact to Techniq VN for details
3M™ Scotchcast™ Electrical Resin 3 is a two-part, oven-curing, rigid, unfilled epoxy liquid resin classified as Class B (130 °C). It is known for its outstanding physical and electrical stability, superior moisture resistance, low viscosity, and fine wetting properties that enable complete impregnation of fine wires in coils.
Impregnating, potting, and encapsulating coils, transformers, modules, and other electrical/electronic components
Designed for use in applications requiring electrical insulation, moisture resistance, and mechanical strength
Suitable for industrial electrical and electronic manufacturing
| Property | Part A | Part B | Mixed |
|---|---|---|---|
| Mix Ratio (A:B) | 2:3 (by weight) | – | 37:63 (by volume) |
| Viscosity (23 °C) | 12,500 cps | 400 cps | 1,600 cps |
| Density | 1.16 kg/L | 1.00 kg/L | – |
| Flash Point | 205 °C | 174 °C | – |
| Property | Value |
|---|---|
| Color | Clear Amber |
| Specific Gravity | 1.10 |
| Compressive Strength | 9,500 psi (10% compression) |
| Tensile Strength | 4,400 psi |
| Elongation @ break | 2 % |
| Flexural Strength | 7,900 psi |
| Hardness (Shore D) | 80 |
| Electric Strength | 300 V/mil (12 kV/mm, 1/8” sample) |
| Thermal Conductivity | 4.0 × 10⁻⁴ cal·cm/(cm²·sec·°C) |
| CTE (23–113 °C) | 20 × 10⁻⁵ /°C |
| Thermal Shock (–55 to 130 °C, 10 cycles) | Fail at 1/4” Olyphant insert |
| Moisture Absorption (240 hrs, 96% RH) | 0.5 % |
| Water Immersion (1000 hrs @ 23 °C) | 0.8 % weight gain |
| Thermal Aging (1000 hrs @ 130 °C) | 1.5 % wt. loss, Shore D +3 change |
| Thermal Aging (1000 hrs @ 155 °C) | 0.93 % wt. loss, Shore D +7 change |
| Dielectric Constant (100 Hz, 23 °C) | 3.37 (130 °C aging: 3.64) |
| Dissipation Factor (100 Hz, 23 °C) | 0.0085 (130 °C aging: 0.020) |
| Volume Resistivity (23 °C) | 1.3 × 10¹⁵ ohm·cm (aged: 1.9 × 10¹⁵) |
| Cure Temperature | Time |
|---|---|
| 120 °C (248 °F) | 1–2 hrs |
| 95 °C (203 °F) | 6–8 hrs |
| 77 °C (170 °F) | 12–16 hrs |
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