Q6: What’s the difference between flex PCB (FPC) and extra thin PCB?
A6: The materials are different. FPC is made of Polymide (PI). Extra thin PCB is made of FR4 material.
1)FPC is more flexible, and you can bend it many times at minimum bending radius, extra thin PCB also can be bendable, but it does not have fixed bending radius, especially in very small size.
2)Price for extra thin PCB is cheaper than FPC.
Q13: As the extra thin PCB is very thin, how do you control the via tolerance?
A13: We will control each manufacturing process:
1) Before drilling, the numbers of the stacked layers can’t be too high, for 0.15mm PCB, maximum layers will be 12.
2)Before drilling, we will protect the raw materials with aluminum on top of the boards to dissipate heat while drilling, and put the wooden board on bottom of the board to make the board well fixed.
3)We will control usage of of the drill, regular maintenance of the drill bit, each drill bit will be withdrawn after 1000 times.
4) Control the vias position tolerance within +/-3 mil