Maintenance Planning for Equipment Built Around a Glass Heater

https://heater-design-center.silverstonebrief.com/posts/how-to-choose-a-polyimide-heater-for-precision-heating

In camera windows, a glass heater must deliver heat in a controlled way. It uses a glass panel combined with a conductive heating layer or heater element. One useful trait is anti-fog capability. Still, thermal stress can change the result