Wes, Two sheets of prepreg provide better control agains -epoxy starvation, voids. One sheet may have higher probability of developing meatl to metal shorts due to - voids, epoxy starvation, and possible migration paths along glass fibres. This probability is reduced when two sheets are used. These observations were based on actual production experience at one of the large board manufacturer. -- _________________________ pratap singh tel/fax: 512-255-6820 email: [log in to unmask] WEB: www.rampinc.com --------------------------------------------------------------------------------- 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 ---------------------------------------------------------------------------------