With reference to some of the comments made on immersion silvers (not mentioning any trade names). Our experience with these finishes has been that they 'tarnish' very quickly in open air and although all PCBs should be handled carefully, stored / packaged correctly etc. HASL is certainly much more forgiving than the immersion silvers in our experience. The immersion tins which are currently on the market look much more promising and initial tests we have carried out on Unicrom (manufactured by cimatec have looked hopeful but I would be interested to hear of any other experiences with immersion silvers / tins. Neil Atkinson Quality Manager Stadium Electronic Controls ################################################################ TechNet E-Mail Forum 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's web site (http://www.ipc.org) "On-Line Services" section for additional information. For technical support contact Hugo Scaramuzza at [log in to unmask] or 847-509-9700 ext.312 ################################################################