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fourlayer
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Material Vendor :KB6160-FR4 TG135 /ROSH
Layer /pcb thickness :  2 Layer /2.0mm 
Copper thickness : 1oz copper 
Solder mask /silkscreen  ;black solder mask/ white silkscreen
Surface finished :HAL LF 
Min width/space: 7.5 / 4 mil 
Min holes : 0.3mm
Technics Characteristic: Thickness &Hole-diameter ratio 6.6 : 01
Technical  Requirement :  three Impedance require
Standard Produce time : 7-8 days 
Fast produce time : 24h ~72h 

2L Impedance boards