Hi Rhonda, If you're talking yield it depends on the design's minimum feature size (line width and spacing), your equipment (imaging & etch) and how tightly you control your chemistry. For us we are using a VCM (Vertical Conveyor Module) with cupric chloride. Hans ~~~~~~~~~~~~~~~~~~~ Hans M. Hinners Materials (Process & Manufacturing) Engineer Warner Robins Air Logistics Center Avionics Production Division Manufacturing Branch 380 Second Street, Suite 104 Building: 640, Mail Stop: LYPME Robins AFB, GA 31098-1638 Voice: (912) 926 - 1970 Fax: (912) 926 - 7164 mailto:[log in to unmask] <mailto:[log in to unmask]> http://www.robins.af.mil <http://www.robins.af.mil/> -----Original Message----- From: Rhonda Trainor [mailto:[log in to unmask]] Sent: Monday, July 24, 2000 9:10 AM To: [log in to unmask] Subject: [TN] What is the industry stand on etching 2 oz copper how much should lose on innerlayers? Rhonda Trainor Circuit Technologies Inc. 3622 Clearview Parkway Atlanta, GA 30340 Phone # 770-458-1700 ext 233 E-mail: [log in to unmask] <mailto:[log in to unmask]>