There are probably as many ways to properly etch as there are people doing it. We use a fresh solution (less then 8 hours old, more then 5 minutes) of: - 10 mL DI water - 15 mL Ammonia (28%) - 8 mL Hydrogen peroxide (35%) The most important part was mentioned in the first part of Timothy's message. " look for the separation _BEFORE_ etching" Alain Savard, B.Sc. Chemical Process Analyst CAE Electronics Ltd. e-mail: [log in to unmask] -----Original Message----- I would recommend looking for the separation _before_ etching the microsection. We use an etchant solution of 15 mL 30% ammonia solution, 1 mL 30% hydrogen peroxide, water to make 100 mL. Leave it on for no longer than 5 seconds then rinse it off. Make it fresh daily, and be careful with the peroxide, it will burn your skin. Timothy Reeves > ---------- > From: Howard Lin > I want to use microsection to check interconection defect (ICD). But I > have > no standard procedure to verify this defect. Should I use microetching on > microsection coupon? Will microetching cause confuse between ICD and > normal > interface between electro'less copper and inner layer copper? Is there any > standard procedure to do microetching? Any input I will be very > appreciated. > > Howard Lin ############################################################## TechNet Mail List provided as a free service by IPC using LISTSERV 1.8c ############################################################## To subscribe/unsubscribe, send a message to [log in to unmask] with following text in the body: To subscribe: SUBSCRIBE TECHNET <your full name> To unsubscribe: SIGNOFF TECHNET ############################################################## Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional information. If you need assistance - contact Gayatri Sardeshpande at [log in to unmask] or 847-509-9700 ext.5365 ##############################################################