... Surface finish: HASL Material and copper : Alu, 1 oz High quality, best price CE & RoHS approval Specifications: ServiceQuotation in 2 ... conductivity 4.0w/m °C Alum PCB PCB TechnologyLayer number: 1-20 layersFinished board thickness: 0.008'' ~0.24'' (0 ... , immersion tin, thick gold platingBase material: FR4 (Shengyi, KB, Intl.); High TG (TG150, TG170), Halogen free, Alum. ( ) Cu, Iron, ceramic ...