Although "well balanced," the MLB construction may have other physical features not yet described. If you have cutouts, v grooves, or other such features, you also may have an "unbalanced" construction. This may be hard to understand and it is equally hard to describe unless the CAD data is read and analyzed. Also, the assembly process must be observed and critiqued. If you intend some type cure testing, most material suppliers provide this capability. DSC and/or TMA testing will tell you about cure and Tg. If the materials are not completely cured, throughout the MLB structure, this many cause problems you see. If other factors are involved, these relationships must be discovered and correlated to design and process management effectiveness. Earl Moon, Proof Of Design --------------------------------------------------------------------------------- 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 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 ---------------------------------------------------------------------------------