Tom, I recommend .006" thick foil for stenciling on .50mm pitch parts. Good luck, Charlie B. Please respond to "TechNet E-Mail Forum." <[log in to unmask]>; Please respond to [log in to unmask] To: [log in to unmask] cc: (bcc: Charles Barker/US/I-O INC) Subject: [TN] Screen for fine pitch parts Good day Technet, May I pose a question of screen thickness in regards to a surface mount fine pitch part. I have a surface mount PCA that is using a 100 pin, 20 mil. spacing TQFP. What is the ideal thickness of the screen I should specify that is not going to put down too much solder paste, thereby preventing bridging between pads? Also, I have been reading a lot on this forum about immersion white tin. It sounds as though many of you feel this is a good finish to use with fine pitch parts. Normally I use gold flash, but this sounds as good or better if the cost is not higher. Where can I find these archives at www.IPC.org so that I may review the consensus? I searched the site but could not find any link to archives. Thank You, Tom Burek [log in to unmask] ################################################################ 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 ################################################################