Thick film tech
Thick film circuits are widely used in the automotive industry, both in sensors, e.g. mixture of fuel/air, pressure sensors, engine and gearbox controls, sensor for releasing airbags, ignitors to airbags; common is that high reliability is required, often extended temperature range also along massive thermocycling of circuits without failure.
The manufacture of such devices are an additive process where deposition of several successive layers of conductor, resistors and dieletrica layers onto an electrically insulating substrate using a screen-printing process. A typical thick film process would consist of the following stages: