China New ProductClean Vacuum Printed Circuit Board - 8layer Hard gold main board | YMS PCB – Yongmingsheng

        Nickel: Hard Gold

　　▪　Usual thickness: 0.7 µm (0.00003”) to 1.3 µm (0.00005”) gold (99.7%) over 5.0

　　▪　µm (0.0002”) nickel or 0.2 µm (0.000008”) to 0.3 µm (0.00001”) gold (99.7%) over

　　▪　5.0 µm (0.0002”) nickel for a solderable surface

　　▪　Very good for corrosion resistance

　　▪　Rated at 130-220 Knoop hardness

　　▪　Very good wear resistance

　　▪　Excellent for surface rotary switches, on-off contacts, and edge connectors

　　▪　Very good shelf life