Using foil on the outside layers of multilayers is permitted. Depending upon which spec you use this requires that a peel strength test be performed monthly on randomly selected lots as part of Group B testing. I don't think DESC has ever allowed a board to be built completely of prepreg and foil, but then I'm not certain. To my knowledge this would not be permitted. Susan Mansilla Robisan Lab *************************************************************************** * TechNet mail list is provided as a service by IPC using SmartList v3.05 * *************************************************************************** * To unsubscribe from this list at any time, send a message to: * * [log in to unmask] with <subject: unsubscribe> and no text. * ***************************************************************************