KW/Randy, This is just a sampling of some of the responses on the Internet to Hong Yuen's problem. Really need to resolve. sam >>> "Hong Yuen Electronics Ltd." <[log in to unmask]> 12/08/97 >>> At 10:23 PM 1997/12/7 EST, you wrote: >Assuming your developing process is in spec, soldermask residue is indicative >of too high a temperature at tack cure; overexposure could also cause the >problem. > >Where is the residue? Is it on the fiberglass or the copper or both? >Give me your process parameters and I'll try to help. > >Mark Dowding >Regional Technical Service Manager >INSULECTRO > Our Process Parameters as follow : - Pre Heat 15min for first side, 30min for second side, temp. 72 +/- 3degreeC the residue was occured on the surface of the gold, especially on the edge of the hole, also, the Stuffer Step is 10 - 12. By the way, all the parameters we have used for more than one year. Please advise ############################################################## 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. For the technical support contact Dmitriy Sklyar at [log in to unmask] or 847-509-9700 ext.311 ############################################################## ############################################################## 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. For the technical support contact Dmitriy Sklyar at [log in to unmask] or 847-509-9700 ext.311 ##############################################################