... thermal conductivity is 1.2w/m.k 3.White soldermask,black silkscree Circuit board Prototype1.Aluminum base ... 0.075mmCopper Thickness:0.5oz-5ozBoard Thickness:0.2mm-1.6mmBase Material:FR-4 CEM-1, 94HB, 94VO,High TG, RogersSurface finished:Immersion Gold ... OSP lead free HASL,Gold platingSolder mask color: green/yellow/black/white/red/blueShape tolerance: ±0.13Certificate: UL, RoHSSpecial requirements ...