Using Polyimide Heater in Dusty, Damp, or Demanding Settings
https://ito-heating.inkharbory.com/posts/materials-and-mounting-choices-for-a-wafer-heater
Many heating problems look like a power problem at first. In practice, the cause may be contact, heat loss, sensor position, or poor fit. A polyimide heater works best when these parts are planned together