An IPC member in Sweden has asked:

I am seeking a good source of information on how to properly drill woven 
glass reinforced teflon material, more specificly Arlon 527.

Our basic problem is a formation of tiny teflon threads, firmly anchored 
in the holewall and protruding several up to 1/10 of a mm into the hole.  
During the subsequent plating steps, these tiny and hard to detect fibers 
are plated with copper causing formation of copper nodules and holesize 
below minimum.


Can anyone provide advice?

Thanks
***************************************************
David W. Bergman, Technical Director
IPC
2215 Sanders Road
Northbrook, IL  60062-6135
708-509-9700 x340 Phone
708-509-9798 Fax
email  [log in to unmask]
***************************************************