You've got a TO-3 on the bench and you're about to smear silicone grease between it and the heatsink. Or you've got a mica washer that's already cracked at the edges. Either way, it's a mess you don't need. These silicone-rubber washers do the same job – electrical isolation plus thermal transfer – without the grease, without the brittle mica. Grey, 4 kV dielectric breakdown, 94V-0 flammability rating. Drop one in, tighten the screw, and the junction's sorted. Twenty in the pack means you're not hunting for a spare next month
| brand | Jaycar |
| category | Electronics & Components |
| subcategory | Electronic Components |
| transistor_package | TO-3 |
| material | Silicone impregnated rubber |
| colour | Grey |
| tensile_strength | 40 kg/cm² |
| elongation | 80% |
| dielectric_breakdown_voltage | 4000 V / 0.3 mm |
| thermal_conductance_coefficient | 2.4 × 10⁻³ |
| flammability_class | 94V-0 / 0.3 mm |
| dimensional_stability | 0.2% change / 0.3 mm |
| pack_quantity | 20 |
| sku | HP1150 |
