Chris, Does 'organometallic tin' mean a co-deposited polymer? Steve I am aware of the Dexter Dexcoat FST process. This is an organometallic tin that places a barrier layer on the copper surface that greatly retards the copper tin migration to a point that shelf life well in excess of one year is easily achievable. This process produces a lead free planar surface that has better solderability than Ni/AU. Some OEM's have claimed that this process is the only alternative finish that they can run on the same assembly line with HASL product and no changes need to be made. The key here is that the process in not an ordinary immersion tin which would have a very limited shelf life. Regards, Chris McGary ################################################################ 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 ################################################################ ################################################################ 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 ################################################################