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Immersion Silver F4B Single Sided PCB High Frequency HF Boards Model Parameter thickness(mm) Permittivity(ER) F4B F4B 0.38 2.2 F4B 0.55 2.23 F4B 0.225,0.3,0.5,08,1,1.2,1.5,2,2.5,3.0 2.65 F4Bk 0.8,1.5 ...