Multi-Layer Boards 4-layer Halogen free pcb specifications:FR-4,1.2mm 1OZ, Green sold mask white slikscreen, Leadfree HAL Technology Capability ¡¡¡¡¡¡¡¡¡¡¡¡LAYERS:1-48Layers ¡¡¡¡¡¡¡¡Materials: FR-4,CEM-3,Rogers,Halogen Free,Hi-TG,etc ¡¡¡¡¡¡¡¡Thickness: 0.2mm-3.0mm copper thickness: 0.5OZ-6OZ ¡¡¡¡¡¡Solder Mask: Green,Blue,white,black,yellow,etc ¡¡¡¡¡¡Silkscreen:¡¡white,black Surface treatment: OSP,(Leadfree)HAL,Gold-plating,Immersion gold/silver,etc Other Technology:Gold finger, peelable mask, Non-across blind/buried vias, HDI,characteristic impedance control,high frequency h-Tg,etc