... ,HASL lead-free,HAL,Flash gold,immersion gold,OSP,Gold Finger Palting,Selective thick gold plating, immersion silver,immersion tin ... Twist: <0.75%16). Tested by:Flying-Probe Tester, Fixture tester , Visual Inspection17). Special requirements: Buried and blind ... vias, impedance control, thick Cu PCB,selectivity plating gold 30 ...