... :1.6mm 4.Quality service Aluminum based PCB Aluminum base boards for LED Layers: single side Material: aluminum base Four types thermal conductivity ... , 1.5, 2.0, and 3.0 Dielectric for aluminum base board: PP or dielectric film Breakdown voltage: >2, ... nth holes, counter sink hole, thermoelectricity separate, FR4 and aluminum boards, depth routing Detailed Terms for Pcb Assembly Technical requirement ...