Hello Technetters ; Could anyone help me to instruct W-3 of Electrochemicals as additives for microetchant? We once used peroxide/sulfuric with W-3 as final etchant, but not in use. The W-3 is the complex of stabilizer, inhibitor and etch promotor. I tried so many times conversing mixed ratio of sulfuric acid, H2O2 with W- 3 to get 1~2 micron meter per 1 min. dipping in solution, but couldn't get good result. I'd like to use W-3 as microetchant additives for OSP treatment. Any advice would be greatly appreciated. Tal Young-Kim R&D Dept. Doosan Electro-Materials Co., Ltd. email [log in to unmask] Tel +82-331-260-0031 Fax +82-331-260-0099 ################################################################ TechNet E-Mail Forum 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's web site (http://www.ipc.org) "On-Line Services" section for additional information. For technical support contact Hugo Scaramuzza at [log in to unmask] or 847-509-9700 ext.312 ################################################################