At the end of the PTH line, after the acid dip and rinse, put in an anti-tarnish and DI rinse. Then the boards must be DRIED completely before any stacking or before df lamination. Most electroless copper suppliers also supply an anti-tarnish for this purpose. An alternative would be a separate, small conveyorized line consisting of 5% sulfuric acid/rinse/anti-tarnish/rinse/ dryer, that would feed right into the df lamination area. I believe the anti-tarnishes are mostly benzotriazole types. Patty ---------- From: Eltek Ltd. - Process Engineering To: technet Subject: Thick Electroless Date: Tuesday, November 26, 1996 8:10AM Hello Technet ! We intend to switch our PTH process from thin copper electroless plus electrolytic strike to thick ( hot ) electroless , 2 microns thick . The line will be loaded with baskets , so we do expect the PCBs will be oxidized.We are considering some kind of chemical treatment prior to dry film lamination instead of pumice scrub.Wjhat kind of treatment is recommended ? *************************************************************************** * 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. * *************************************************************************** *************************************************************************** * 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. * ***************************************************************************