1.fr4 94v0 PCB board 2.single layer circuit board 3. HASL surface finish 4. Min ... : FR-4, CEM-1, aluminum, and moreFinish board thickness: 0.2 to 3.2mmExternal copper thickness: 35 to 210umInternal copper thickness ... , yellow, red, white, blue, matte green, matte black, and more 94v0 PCB board