Ceramic PCB Manufacturing & Assembly – One-stop service The ceramic substrate (ceramic PC refers to a special process board in which a copper foil is directly bonded to a surface of an alumina (Al2O3 ) or aluminum nitride (AlN) ceramic substrate (single or double-sided) at a high temperature. The ultra-thin composite substrate produced has excellent electrical insulation properties, high thermal conductivity, excellent solderability, and high adhesion strength, and can etch various patterns like a PCB board, and has a large current carrying current ability.