... PCB specification: base material, board thickness, copper thickness, surface finishing, gold immersion thickness, and any other special requirements.4) Test ... .3mm)pcb with green solder mask and LF-FREE surface finishing BGA Pitch (b)0.027"(0.675mm)Regesiter ... °45°V-cut15° 30° 45° 60°Surface finishHAL, HASL Lead Free, Immersion gold, Gold plating, Gold finger, immersion silver, immersion Tin, OSP, ...