When I had this problem many years ago it was because the anode bag had been pulled up tight against the bottom of the anode. I have also heard from others that a napped bag with too tight of a weave will not allow the copper sulfate that forms at the anode during electrolysis to migrate through the bag before it becomes so concentrated that it salts out. ---------- From: tonghh To: [log in to unmask] Subject: Acid copper bath Date: Monday, March 17, 1997 9:49AM To all technet users , Quite often I experience copper crystallization in the acid copper bath which results in plating distribution problem .Apart from the several factors that affect this crystallisation -fluctuating current , concentration of the bath , anode bag , anode basket etc -maybe someone would like to share more on this problem and how to overcome this in the plating line. Thanks . ************************************************************************ *** * TechNet mail list is provided as a service by IPC using SmartList v3.05 * ************************************************************************ *** * To subscribe/unsubscribe send a message <to: [log in to unmask]> * * with <subject: subscribe/unsubscribe> and no text in the body. * ************************************************************************ *** * If you are having a problem with the IPC TechNet forum please contact * * Dmitriy Sklyar at 847-509-9700 ext. 311 or email at [log in to unmask] * ************************************************************************ *** *************************************************************************** * TechNet mail list is provided as a service by IPC using SmartList v3.05 * *************************************************************************** * To subscribe/unsubscribe send a message <to: [log in to unmask]> * * with <subject: subscribe/unsubscribe> and no text in the body. * *************************************************************************** * If you are having a problem with the IPC TechNet forum please contact * * Dmitriy Sklyar at 847-509-9700 ext. 311 or email at [log in to unmask] * ***************************************************************************