Imagineering, Inc. | https://www.pcbnet.com/blog/pcb-substrate/
. Coating the core is prepreg , a dielectric material binding agent that covers the core. An outer layer of foil is attached to the surface, forming the surface area which component parts will be attached and traces will be etched
| https://www.eptac.com/blog/the-journey-of-a-pcb-design-instructor
. I have a robust online presentation setup that lets me show them actual objects. In-person classes are great because students can touch these objects, like feeling how much 1 oz of copper weighs or what prepreg feels like
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