IPC-RB-276 does not require thickness measurement for fused tin-lead plating or HASL coating. Solderability requirements are the only issue addressed. If you have major planarity problems, you may want to consider alternative platings/finishes. I have heard of some companies delivering very thin unfused tin-lead for some customers trying to deal with the flatness issue. Regards Dave Bergman, IPC On 25 Sep 1996 [log in to unmask] wrote: > Does anybody know what is the tin-lead HASL plating thickness requirements > for printed circuit boards? Do you have any standards which specified it? > IPC-A-600D specified only the minimum plating thickness, which is 0.005mm > or 0.0002" for our application. > We are having a problem with the circuit board which plating thickens is > greater than the other ones. Also, the plating surface is not flat. > This is not the fine pitch components board. But, when pads are so > "bumpy" and plating is thicker than other boards, the adhesive dots > application becomes difficult. Glue dispenser shall be adjusted for the > proper adhesive dots size. > It would be greatly appreciated if anyone could give me any directions. > > > > > *************************************************************************** > * TechNet mail list is provided as a service by IPC using SmartList v3.05 * > *************************************************************************** > * To unsubscribe from this list at any time, send a message to: * > * [log in to unmask] with <subject: unsubscribe> and no text. * > *************************************************************************** > > *************************************************************************** * TechNet mail list is provided as a service by IPC using SmartList v3.05 * *************************************************************************** * To unsubscribe from this list at any time, send a message to: * * [log in to unmask] with <subject: unsubscribe> and no text. * ***************************************************************************