from running a few tin-nickels in the early 1980's at a few of my accounts - i can give u some info on this process: 1- sn/ni plating bath deposits an alloy with a 1:1 atomic ratio of tin to nickel or 65% tin and 35% nickel by weight 2- excellent corrosion resistance, bright appearance and is extremely hard 3- difficult or almost impossible to reflow - since it goes thru a metallic phase change prior to melting 4- it has a tendency to dull with age and forms a tenacious, chemically resistant oxide on the surface which is self-healing 5- high operating temperature - 140 - 160 F - increases resist leaching into the plating bath 6- poor deposit shelf life - due to the formation of the oxide film u may want to conduct some tests prior to using this process in production - this data is provided on a process that was in use back in the 80's - someone may have changed formaulation over the ages and maybe something new on the market regards Richard Fudalewski Atotech Canada Ltd *************************************************************************** * 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] * ***************************************************************************