Hi Blair, I forgot to mention that in this case we are the customer (we assemble the boards), and our pcb-supplier is confronting us with this newer standard. Our customer (quite knowledgeable people, I'd say) consider this unacceptable practice, and they reject the products that have the exposed fibers. Daan >>> [log in to unmask] 08/25/03 04:49pm >>> Daan, If I remember correctly from my days in Aerospace it is perfectly acceptable for a company to migrate to a new standard when an old standard is superseded. It is entirely the option of the organization to determine which version of the standard to use - the one called for in the contract or the latest version or superseded standard. However, if you are going to do this, I would recommend that you let your customers know this when they place an order with the old standard called out. Blair Hogg QA Manager GAI-Tronics Corp. >>> [log in to unmask] 08/25/03 10:21AM >>> Hi Technet, Mil-P-55110D is not active anymore, and has been replaced by MIL-PRF-31032. If the production-drawing states "PCB shall be produced according to to MIL-P-55110D" does it mean that the board manufacturer has the freedom to use the replacement specification ? The specific issue is that Mil-P-55110 D does not allow exposed fibers, whereas Mil-PRF-31032 does allow this (with some restrictions of course), but I assume there are more diffferences between these two specs. Best regards, Daan Terstegge Unclassified mail --------------------------------------------------- Technet Mail List provided as a free service by IPC using LISTSERV 1.8e 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 or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL) To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest Search the archives of previous posts at: http://listserv.ipc.org/archives Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 -----------------------------------------------------