... , FR-1, CEM-1, CEM-3, FR-4 Halogen Free ,Aluminum base.2)layer: 1-32 3)board thickness: 0.4mm ... )surface finish: HASL, Lead free HASL, OSP, Gold-plating, Chemical silver, Chemical gold(ENIG),Chemical tin, Carbon ink.8)solder mask ... : 90-120Ω, Tolerance: +-10% 16)Quality standard: IPC-A-600F. Aluminum PCB for light with UL/ETL shenzhen