Dave,

The following paper has wetting balance data at 245°C and 260°C.  This
should give you a ballpark figure for 255°C.

http://xmembers.ipc.org/IPCLogin/IPCMembers/IPC/Review/1105/Nov2005ReviewTechPap.pdf

Regards,

Dan Blass
Process Research Engineer
Area Array Consortium
Surface Mount Technology Lab
Universal Instruments Corporation
http://www.uic.com/wcms/WCMS2.nsf/index/Global_Svc_Support_31.html

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