... in 2 hoursQuick and economic delivery termFR4 Double-sided and Alum single-sided sample in 24 hours4 layer sample in 72 ... technology productsMass production for heat conductivity 4.0w/m °C Alum PCB PCB TechnologyLayer number: 1-20 layersFinished board thickness: 0 ... : FR4 (Shengyi, KB, Intl.); High TG (TG150, TG170), Halogen free, Alum. ( ) Cu, Iron, ceramic base