For chemically etching polyimide (Kapton, etc.), usually a strong basic solution will work such as KOH, NaOH, etc. Most of the time an alcohol is added. I've used a solution of ethanol, KOH, and water. There are also commercial strippers on the market containing sodium hydroxide and furfuryl alcohol. Be sure to use proper safety equipment and procedures when handling the materials, as the pH is quite high. Perhaps Dupont could provide you with some information on specific etching recipes. Cured polyimide is very solvent resistant. I'm not sure that there are too many things that will dissolve it. N-methyl pyrrolidone (NMP) is used to dissolve uncured or partially cured polyimide, but in my experience, it didn't attack fully cured material. I've also seen uncured types of polyimide dissolved in gamma-butyralactone or xylene. I'm sure that polyimide can also be etched with plasma. Perhaps someone can share the details of that process. Dave Anderson Opinions expressed are my own and not necessarily that of my employer. >>> Bob <[log in to unmask]> 02/13/98 02:01pm >>> I am interested in the subject of Kapton Etching. Does anyone have information about which types of Kapton material can be etched and how? Bob Carter Multi-Fineline Electronix, Inc. 1301 N. Dynamics St. Anaheim, CA 92806 714-996-1248 ################################################################ 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 web site (http://jefry.ipc.org/forum.htm) for additional information. For the technical support contact Dmitriy Sklyar at [log in to unmask] or 847-509-9700 ext.311 ################################################################ ################################################################ 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 web site (http://jefry.ipc.org/forum.htm) for additional information. For the technical support contact Dmitriy Sklyar at [log in to unmask] or 847-509-9700 ext.311 ################################################################