THE SMART TRICK OF PCB MATERIAL THAT NOBODY IS DISCUSSING

Substrate: A non-conductive layer that provides mechanical toughness and guidance. The substrate is often made up of FR-four, a glass-strengthened epoxy laminate material built up of fiberglass fabric plus a flame retardant epoxy resin binder.After the etching, the dry film is chemically faraway from all around the laminate, which leaves the whole