Using Mica Heater in Dusty, Damp, or Demanding Settings
https://smart-heaters.lumenforgex.com/posts/custom-ito-glass-heater-design-what-engineers-should-define-early
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 mica heater works best when these parts are planned together