Do you have any information as to whether this is Omikron? :-) -----Original Message----- :-) From: TechNet [mailto:[log in to unmask]]On Behalf Of :-) Hollandsworth, Ron :-) Sent: Monday, July 31, 2000 5:14 PM :-) To: [log in to unmask] :-) Subject: [TN] Subj: White Tin :-) :-) :-) Hello TechNet: :-) We performed some experiments on Immersion White Tin boards :-) and found the :-) following . . . . First, we had no problems with solder :-) paste application. :-) Second, no problems with vision systems, etc., and part :-) placement. Third, :-) solder joints looked pretty good . . i.e. . no problems. :-) Here is the :-) kicker. The mounting holes on the top side were white tin. :-) The mounting :-) holes need to be very flat for good contact so we do not :-) apply solder paste :-) to these holes. The white tin, after exposure to humidity of the :-) environmental chambers looked very oxidized and a flaky :-) white powdery like :-) substance was observed. Also under some RF type :-) connectors, the white :-) powdery like substance was observed. The powdery like :-) flaky substance did :-) not show up under any other components only the gold RF connectors. :-) :-) What experience have any of you had with the immersion :-) white tin process? :-) Any ideas, thoughts, etc., on the powdery white :-) substance??? We are going to :-) have our "product assurance forensic lab" analyze it and :-) see what they come :-) up with, but we also thought it a good idea to tap the :-) intelligence of the :-) TechNet World as well. :-) :-) Ron Hollandsworth :-) ITT :-) :-) :-) ************************************ :-) If this email is not intended for you, or you are not :-) responsible for the :-) delivery of this message to the addressee, please note that :-) this message may :-) contain ITT Privileged/Proprietary Information. In such a :-) case, you may not :-) copy or deliver this message to anyone. You should destroy :-) this message and :-) kindly notify the sender by reply email. Information :-) contained in this :-) message that does not relate to the business of ITT is :-) neither endorsed by :-) nor attributable to ITT. :-) ************************************ :-) :-) ############################################################## :-) 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 Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 ############################################################## ############################################################## 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 Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 ##############################################################