Don A number that was seen on this forum at one time was 30 grams of component mass per 1 square inch of total pad area. I have used this on some oscillators and it was OK. Joe Hurst, CET PWB Designer Computing Devices Canada A General Dynamics Company [log in to unmask] 613-596-7816 -----Original Message----- From: Steffen, Don E [mailto:[log in to unmask]] Sent: Friday, September 17, 1999 11:35 AM To: [log in to unmask] Subject: [TN] Bottom Side reflow. Technetters We are doing a double side reflow. What is the formula to determine the maximum component mass double side reflow so the components will not fall off during reflow. I realize it is also necessary to know the amount a surface tension also necessary. Is there a point, such as 14 pin or less IC that I can safely process through the reflow. What is the experience of the industry? I appreciate any responses you can provide! Donn E Steffen Senior Quality Engineer VDO Control Systems Auburn, IN 46706 Phone (219)925-8887 Fax (219)925-8710 Email: [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. If you need assistance - contact Gayatri Sardeshpande at [log in to unmask] or 847-509-9700 ext.5365 ############################################################## ############################################################## 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. If you need assistance - contact Gayatri Sardeshpande at [log in to unmask] or 847-509-9700 ext.5365 ##############################################################