Ron, You are not doing two things right from the information you wrote below. Rubber squeegees and thick stencils (0.007") bring always a poor soldering result for the QFP (0.5 or 0.4mm pitch??). Recommend the following: - Use metal squeegees - Increase stencil aperture aspect ratio, recommend 0.006" or 0.005" stencil thickness(I prefer 0.005"). - Use Au/Ni plated or OSP coated boards, HASL boards are bad comination with 0.5mm or less pitch QFP's Said all that, fine pitch stencil aperture size also plays an important role. 95% to 99% yield is typical and considered a good result. Regards Matthew Park >>> Ronald Mowbray <[log in to unmask]> January 16, 1998 9:30 am >>> I would like to get some information on expected yields for non-soldered leads using 240 pin PQFPs. Is this common or can process improvements without equipment purchases help?. We have a FUJI GSP III screen printer with rubber squeezes and are using 7 mil thick laser cut stencils. I could use any help and expected yields information. We are going to change to BGA sometime later this year. Thanks Ron Mowbray Menber of Technical Staff Paradyne Corp. Largo, Fl. e-mail: [log in to unmask] ############################################################## 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 ##############################################################