Good Morning Dan! From an assembly point of view your temperatures are pretty workable for a reflow profile but the ramp rates are somewhat restrictive. I have seen multiple instances of reflow processes running at ramp up/down rates of 4-6 C/sec with no danger of impacting the component integrity. Is there a material rationale for the 2 C/sec ramp rate suggestion? As an assembler I am always give preference to components with the maximum reflow profile robustness. Dave Hillman Rockwell Collins [log in to unmask] "Dan R. Johnson" <[log in to unmask]>@ipc.org> on 02/20/2002 03:14:49 PM Please respond to "TechNet E-Mail Forum." <[log in to unmask]>; Please respond to "Dan R. Johnson" <[log in to unmask]> Sent by: TechNet <[log in to unmask]> To: [log in to unmask] cc: Subject: [TN] Safe processing window A couple of questions for what has become my best engineering resource. Management has asked me to provide a re-flow profile for our product, a surface mount component built on FR-4 with lead free solder. I am reluctant, I would prefer to generate a "safe processing window" type document. As manufacturing professionals what do you prefer? The window would spec ; max 2 C /sec ramp up, max 60 sec dwell above 180 C, max 220 C peak, and a 2 C/sec max ramp down. Could you live with this? Many thanks for your help, Dan --------------------------------------------------------------------------------- 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 e-mail to [log in to unmask]: SET Technet NOMAIL To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest 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 ---------------------------------------------------------------------------------