Homebrew PCBs

Peter,

FR4 copper plated should be perfectly flat.

If bare board, it still should be flat but you can sometimes see that internal structure.

Bertho

 

From: Peter  Sent: Wednesday, May 14, 2014 17:20



I just received my first order of epoxy/glass copper clad (thus far I
have been using 30+ year old phenolic) and the weave pattern is from
the glass is *very* pronounced on the surface of the copper. Is this
at all common? Have I purchased a low-grade board? I did some
googling, and all I could find in reference to the weave patterns was
in relation to the performance of high-frequency circuits.

Although I am not concerned about high-frequency performance, there is
enough surface irregularity to substantially effect toner transfer.
It actually takes a fair bit of sanding (i.e. I need to start with 100
grit paper) to clean the board up and get things flat.