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4. What is the dielectric strength of each different insulation material?

Minco standard heaters with polyimide, silicone rubber or mica insulation are tested to verify 1000 VAC minimum dielectric breakdown voltage. We can provide custom models with thicker insulation to increase the dielectric rating, but this will reduce the maximum power and temperature ratings for the heater. Another consideration is the amount of dielectric leakage current at operating voltage. Because an etched element covers 50% or more of the heater surface area, it can act as a capacitor when AC power is applied. The result is a leakage due to the capacitive effect. This is not a failure of the insulation but it may exceed the very low limits required for some medical and other applications. Minco can use special design techniques to minimize this leakage if your application requires meeting tight limits.

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