Lou, IBM specified an adhesion promoter (like b. oxide) under soldermask for years...not sure if they still do. marko Greetings ! The Fab house that we use has recently asked us if they could use a black oxide treatment on external layers of our designs. I know that this process is used for internal layers but I want to know if any of you have used it for external layers ? Their reason for using it is " To create better adhesion for the solder mask and eliminate potential slivers ". To me, this sounds more like a process problem. What do you think ? To recap, do any of you use a black oxide coating on outer layers ? If so, why ?. If not, why not ? Thanks in advance for your help ! Lou Takach Union Switch & Signal Inc. 412.688.2574 (voice) 412.688.2399 (fax) [log in to unmask] *************************************************************************** * 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. * *************************************************************************** **************************************************************************** * The 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. * ****************************************************************************