Darrell FR-4 is the flame retarded version of G-10. The properties may not be exactly the same G 10 is hard to get. Nearly all epoxy laminate is FR4. I've seen cases where the user wanted the flamibility of G-10 Better contact your customer and get the print changed, or get G-10 if you can J S Sallo Sallo Consulting Services Phone or Fax 760 346 6717. *************************************************************************** * TechNet mail list is provided as a service by IPC using SmartList v3.05 * *************************************************************************** * To subscribe/unsubscribe send a message <to: [log in to unmask]> * * with <subject: subscribe/unsubscribe> and no text in the body. * *************************************************************************** * If you are having a problem with the IPC TechNet forum please contact * * Dmitriy Sklyar at 847-509-9700 ext. 311 or email at [log in to unmask] * ***************************************************************************