... . 3.Final pcb functional testing. 4.20 years experienc mp3 player circuit board pcb Welocme to tianweisheng, We are professional circuit ... ,FR-4,CEM-1,CEM-3,Hight TG,FR4 Halogen Free,Aluminum material, Taconic ,94V03Board thickness0.2mm-7mm4Max panel size630mm ... 7min.line spaceing0.075mm(3mil)8Surface finish/treatmentHALS/HALS lead free,Chemical tin,Chemical Gold,Immersion gold Inmersion Silver/Gold, ...