Troubleshooting Slow Heat-Up in a Glass Heater System

https://heating-technology-works.nexorafield.com/posts/how-to-select-a-mica-heater-for-industrial-heating-applications

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