Chester: HADCO Corporation is U.L.-approved for up to 5 oz. cu./ft. sq. work, although typically these types of boards are processed through one of our Tech Centers. As a matter of fact, certain niche type work fabricated in our Tech Centers has been as high as 10 oz. cu.! Although the assets are in place in our volume facilities and tech centers to do primarily multilayer work, we still do entertain work of a double-sided nature which does not involve high-running, long-term commitments. My big concern is the tape or film artwork. We work strictly from electronic data, but when a customer has mature product, the artwork can oftentimes be scanned and digitized. Most larger board fabricators use electronic data, usually Gerber but sometimes in other formats (DFX, etc.). There are many design bureaus which can offer this type of service, and HADCO has worked with some in order to get the electronic data needed to fabricate a good, quality artwork. There may be smaller houses which can still accept tape or film artwork as part of the engineering package. Typically, because of the effects of heat and humidity on film or tape-ups, care should be taken to make sure that the film hasn't shrunk or grown, or some of the tape hasn't flaked. Reproductions of reproductions of artwork may also cause problems such as peppering or undefined feature edges. Fingerprints and Exacto knives have also been known to degrade artwork on a film medium. Another issue is with stepping and repeating the artwork onto the panel, especially with very small parts. I wish you luck in your endeavors. If you need further assistance or information, please feel free to contact me at (607)687-3425, X 5215, or by E-mail: [log in to unmask] Tom Coyle Field Services Engineer HADCO Corporation [log in to unmask]