Hi Dave, Outplating is mainly on the heater element/holder (we do use direct heating) and also on the bottom/sidewalls of the tank. According to R&H, this is caused by roughning of the tank Can you also give some suggestion/guidelines to maintain the bath? Thanks, Peter Kuijpers MiPlaza DTS/TFF High Tech Campus 04 Room: WAGp5-11 5656 AE Eindhoven The Netherlands Phone.: (+31 40 27) 98904 (mobex) mobile:(+31) 06-12507027 fax.: [+31 40 27) 44769 mailto:p.e.m.kuijpers@philips.com "David Roberts"writes: Subject RE: [mems-talk] Au electroplating Classification Hi Peter, A new E-less Ni shouldn't fire off (outplate). Where does the fire off occur? Everywhere, or only on your heater? Indirect heat should be used. Regards, Dave Roberts (Wafer Plating Specialist) Prodigy Surface Tech. Santa Clara, CA