Dan, You've got some fine answers to the meaning of your question, but I would like to check the reason of it. What do you actually want to do? Estimate the contamination from paste and non-RoHS components and see if you are within 0.1% Pb? If so, forget it, this is precisely not how you assess RoHS compliance! The contamination is checked on homogeneous material; to simplify it, if one joint has more than 0.1% Pb, from let's say touch-up with the wrong wire or from non-compliant finish of one component, the product is not RoHS, regardless of the condition of all the other spots on the board and the overall Pb percentage. If I misinterpreted your intent, my apologies and please carry on in your quest. Regards, Ioan -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Dan Mathews Sent: Tuesday, May 20, 2008 12:10 PM To: [log in to unmask] Subject: [TN] Average paste volume estimate Does anyone have an easy way to estimate how much paste is applied to a smt pcb? I understand it varies on squeegee pressure, stencil thickness, and pitch of the components but I was looking for an average. I would assume that somewhere out there someone can estimate that "2 grams of paste is used on a 2" x 2" smt pcb". I will then use this information to determine how much lead is used on non-RoHS products due to solder paste issues and not non-compliant components. Thank You in Advance, Dan Dan Mathews C.I.D.+ Engineering Support Supervisor B&B Electronics Ottawa, IL USA 61350 Phone: 815-433-5100 ext 217 Fax: 815-434-8831 (direct to my desk) URL: http://www.bb-elec.com <http://www.bb-elec.com/> --------------------------------------------------- Technet Mail List provided as a service by IPC using LISTSERV 15.0 To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF Technet To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL) To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest Search the archives of previous posts at: http://listserv.ipc.org/archives Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815 -----------------------------------------------------