The gold thickness requirement for sliding contacts (edge connectors) for UK telecomms used to be 5 microns (0.0002") gold on copper, based on the fact that this would withstand thousands of insertions. This was reduced to 2.5 microns gold, direct on copper or with a nickel underplate. Can't believe these standards are still used since nowadays there is no need for so many insertions. Geoff Layhe www.lamar-uk.co.uk > ---------- > From: <Rudy Sedlak>[SMTP:[log in to unmask]] > Reply To: TechNet E-Mail Forum.;[log in to unmask] > Sent: 14 June 2000 04:22 > To: [log in to unmask] > Subject: Re: [TN] Gold over Copper?!? (II) > > We do not make PCB's, we make the chemicals that make the PCB's. > > I have been to the UK many times on business, and found this out. > Typically, > the gold was electroplated, and was at least 40, and I seem to recall 60 > millionths of an inch thick, (1-1.5 microns), and it may have been more, > and > yes, it did alloy with the Copper, but it took a long long time to alloy > with > that much Gold, and it soldered very well. > > So, IF you must put Gold on to Copper, make sure it is REAL thick. > > Rudy Sedlak > RD Chemical Company > > ############################################################## > 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 ##############################################################