Hello Ryan, There are numerous suppliers of this process currently, each with their strengths and weaknesses. I believe the greatest concern with immersion tin as final finish however is with tin whiskering. McGean-Rohco, Inc. (Cleveland, Ohio) has just recently presented a technical paper at the IPC Works which covers this and has developed a solution to the whiskering issue while at the same time allowing for immersion tin as the final finish. If you would like additional information please contact George Bokisa ( Technical Manager-Electronic Chemicals) @ 216-441-4900 in Cleveland and he will gladly provide you any assistance you may need. Regards, Frank Freitas Technical Sales Engineer McGean-Rohco, Inc. 2910 Harvard Avenue Cleveland, OH 216-441-4900 ------Original Message------ From: Ryan Grant <[log in to unmask]> To: [log in to unmask] Sent: November 3, 1999 7:42:27 AM GMT Subject: [TN] immersion tin as a surface finish Hi Technetters, Anybody using immersion tin as a surface finish? What are some of its quirks? We have a customer that wants us to use it, so we are going to qualify it as soon as we can get some boards in from multiple suppliers. During the qual, I would like to know ahead of time what problems to look for. We are currently assuming it will be a drop in for our OSP and immersion gold boards. (We got rid of HASL a while ago because of shorting on fine pitch is orders of magnitude high than gold). Thanks Ryan Grant Process Development Engineer MCMS (208) 898-1145 FAX (208) 898-2789 [log in to unmask] ############################################################## 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 ############################################################## ----------------------------------------------- FREE! The World's Best Email Address @email.com Reserve your name now at http://www.email.com ############################################################## 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 ##############################################################