Earl Moon, Thank you for the response and input. Unfortunately, I can't comment on what other people are doing, we practice our craft in relative isolation at the southern extreme of Africa. We assemble multilayers on lightweight registration fixtures on multiline pins, then 'spotweld' the edges (while still on the fixture), to hold the layer / layer position during pressing (off the fixture). It is assumed that the prepreg in these 'spots' has sufficiently gelled or cured to hold their position. There is no use of heavy caul plates / pins etc. only 2mm separators in the press (with packing to achieve correct time / temp profile). This does work great up to 8 layers, OK for 10 but then gets a bit wobbly from 12 up. I was hoping that someone else had already done their homework on this one so that I could crib the answers without having to do the hard work myself. We currently limit ourselves to offer MLB's only up to 10 layers, but would like to go the next step - customer demand! Mike. --------------------------------------------------------------------------------- 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 ---------------------------------------------------------------------------------