Uploaded June 2016 | Updated September 2026, 3 weeks ago

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What's inside a circuit board? After etching away the copper and epoxy one is left with the glass fiber which give a circuit board it's mechanical strength.

Background on the glass:

isola-group.com/wp-content/uploads/2014/05/Developments-in-Glass-Yarns-and-Fabric-Constructions-PCB-Magazine-March-2014.pdf

Electrical reasons why this is important:

altera.com/content/dam/altera-www/global/en_US/pdfs/literature/an/an528.pdf