6L

parameter
6 l layer:
Material: fr-4 Tg150.
Plate thickness: 1.5mm
Copper thickness: 35/18/18/35um.
Line width: 4/5.39 mil.
Most holes: 0.2mm
Surface treatment: ENIG(1U')
Technical difficulties: photovoltaic products, 5G high frequency,
Jangdan gold finger, local thick copper.