We reworked PCB's removing the soldermask. We did not find any chemical. We used a Mototool with a rubber disk (you can find it in Dentist store). The rubber disk must be soft enough to avoid to remove the copper. You will need a skilled operator to do this. Mauricio At 01:14 PM 26/04/00 -0600, you wrote: >We need to remove a small area (0.120" x 0.100") of soldermask from the top >layer, without removing any of the copper underneath. Is there a chemical >used to "etch" out this soldermask, and not compromise the copper layer >underneath? As always, your responses are most welcome > >Ivan Barrios > >############################################################## >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 Keach Sasamori at [log in to unmask] or >847-509-9700 ext.5315 >############################################################## > > Mauricio Castro New Products Mgr CIMME SA de CV Volcan Vesubio 5079 El Colli, Zapopan, Jal, Mexico, 45070 Tel: (523) 120-9880 www.cimme.com.mx ############################################################## 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 Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 ##############################################################