Jim, You have chemically altered the polymer. It will no longer perform it's designed function. David A. Douthit Manager LoCan LLC "Marsico, James" wrote: > Help! Emergency! > > We have a completed assembly (top assembly with many boards, hybrids, etc.) > ready for shipment to our customer (space product). The last operation was > to ink mark a S/N. The ink is cured at 150 F for 2 hours. The assembly was > put in an oven at 150 C for two hours. After hours of reviewing all of the > materials and bill of material, component by component (component data, > supplier phone calls, etc.), the only item that is not rated for 150 C is > the polyurethane conformal coating, which turned yellow/brown in color. Can > anyone explain what actually happened to the coating and if it can be used > as is? > > Thanks, > > Jim Marsico > Senior Engineer > Production Engineering > EDO Electronics Systems Group > [log in to unmask] <mailto:[log in to unmask]> > 631-595-5879 > > --------------------------------------------------------------------------------- > 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 > --------------------------------------------------------------------------------- --------------------------------------------------------------------------------- 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 ---------------------------------------------------------------------------------