If we assume that a high cooling rate is important (~4 C/sec), does anyone have information about how far below solidus it is important to maintain a high cooling rate for Sn62 and Sn63? I've always gone by the rule of thumb that the critical cooling range is from peak temp down to solidus minus 20C or 30C. Once you get below solidus minus 20C or 30C the fine grain structure is in practice fairly well established. Any thoughts? --------------------------------------------------------------------------------- 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 ---------------------------------------------------------------------------------