> Hi techneter > > Currently I am looking for low temperature solder paste for IR ( 150 -170 > deg C ) to use on a Flex circuit with new material. Distortion is found > on the material when peak temperature reachs 207 deg C from a preliminary > study. > > As reply from two major solder paste supplier in North America, the most > common alloy is Sn43Pb43Bi14 with 163deg C melting point. Can anyone > advise how common is this alloy used in Electronic Assembly, ot there is > other alloys, how long has been in the market. > > And I heard that this Bi alloy is every expense, it is almost 20x as the > normally. > > Also, some report say the soldering quality is worst and quality is > difficult to control. > > I need advise from every angles from your experience. > > Best regards, > Andrew 27/1 ############################################################## TechNet Mail List provided as a free service by IPC using LISTSERV 1.8c ############################################################## To subscribe/unsubscribe, send a message to [log in to unmask] with following text in the body: To subscribe: SUBSCRIBE TECHNET <your full name> To unsubscribe: SIGNOFF TECHNET ############################################################## Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional information. If you need assistance - contact Gayatri Sardeshpande at [log in to unmask] or 847-509-9700 ext.5365 ##############################################################