Russell, Acid copper pulse plating involves the use of a pulse rectifier. The rectifier is capable of reversing the current periodically, hence the term periodic pulse reverse (PPR). The combination of, the manipulation of the pulsed wave and the additive (brightner and carrier) gives superior copper thickness distribution on the surface and in the PTH without the need to resort to low CD plating. Advantages are in product quality and in productivity. Drawbacks are cost of rectifier and the learning curve of all the new parameters like forward and reverse current, duty cycle etc. If you have very demanding parts Pulse Plating could be in your future. George Milad Technical Marketing Manager The Shipley Company --------------------------------------------------------------------------------- Technet Mail List provided as a free service by IPC using LISTSERV 1.8d To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF Technet To temporarily halt delivery of Technet send the following message: SET Technet NOMAIL Search previous postings at: www.ipc.org > On-Line Resources & Databases > E-mail Archives Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 ---------------------------------------------------------------------------------