Troubleshooting Slow Warm-Up in Polyimide Heater

https://thermal-devices.hexaforgey.com/posts/improving-thermal-efficiency-with-the-right-mica-heater-setup

A polyimide heater can solve a simple problem: place useful heat close to a part that needs it. The best result comes from a clear plan. Shape, power, contact, and control all affect the final behavior