Question? There is a formula somewhere which I can use to calculate the maximum allowable mass of a component in relation to the pad lands. Basically I want to make sure our designers do not put components on the underside of the PCB which are going to fall off during doublesided reflow. I would like to point out that this is a design for manufacturability question, not an attack on the tentative grasp on reality some card designers have. Steve. --------------------------------------------------------------------------------- Technet Mail List provided as a free service by IPC using LISTSERV 1.8d 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 delivery of Technet send the following message: SET Technet NOMAIL Search previous postings at: www.ipc.org > On-Line Resources & Databases > E-mail Archives Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 ---------------------------------------------------------------------------------