Dear Kandasamy,
I got your email from Paul. Re those questions
you are interested, I would like to response as follows:
1) Yes, there is single-sided FR4 1.6mm 35um
copper laminate on most of the double-sided laminate suppliers' products list.
However, as single-sided FR4 is not popular when compare with double-sided FR4,
laminate suppliers ask for hugh MOQ. In addition, the price difference between
single-sided FR4 & double-sided FR4 is not big, say 10%. In order to escape
from the big MOQ reqirement, PCB manufacturers start on double-sided & etch
away one side of copper in case they need single-sided FR4.
2) Yes, FR4 is punchable for holes with
diameter 0.8mm to 7mm & for outline profile. However, punched holes is not
good for copper plate through as the punched hole wall surface is not smooth
enough compare with drilled holes'.
3) We use steel punching tool to do the NPTH
& outline profile.
Wish it helps.
Best regards, Boris
Cheung