Polyimide boards, as an example, are more hygroscopic than most other board/material types at about .5% whereas epoxies are about half that. I believe better specs are available than your shop's recommendations. Boiling just doesn't get it for me. Also, supplier dessication is a good idea as well as pre-baking at your site, if the supplier doesn't, then sealing and dessicating until use. Upon climb out, cruise at altitude, and descent, the boards will be tested severely enough without time for baking - unless in Afghanastan in the summer months. MoonMan --------------------------------------------------------------------------------- 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 ---------------------------------------------------------------------------------