Phil, You are in a nasty position! When moisture combines with motor oils, fuels, or most other man made hydrocarbon compounds numerous acids are formed due to the chemistry of the additives. I have seen cases where this combination will "eat" aluminum, permeate double "O" rings, sealants, and torqued down screw combinations in 3 years. The only choice you have is to apply a replaceable sacrificial coating over the "sealed" area and periodically remove and replace it (it will be fairly thick!). The main problem is finding something that will withstand the vibration and temperature as well as the chemical issues for a year or so. If the rest of the CCA housing is hermetically sealed then you may have a fighting chance. If not then you will need parylene coating on the CCA. Good luck and please don't forget to do some serious testing of the design under operating conditions. David a. Douthit Manager LoCan LLC Phil Bavaro wrote: > Sorry, definitely Class 2. > > Warranty period of 3 years is acceptable although would like something > longer if possible. > > At 09:55 AM 4/15/2002 -0700, David Douthit wrote: > >Phil, > > > >What class product is this? (2 or 3) > >More importantly what is the "warranty" period for this product? > >(Anything longer than 3 years will be a problem!) > > > >David A. Douthit > >Manager > >LoCan LLC > > > >David A. Douthit > >Manager > >LoCan LLC > > > >phil bavaro wrote: > > > > > Ok, I've been around the sealant, conformal coating, potting, and general > > > adhesive world for 20 years and I have my own opinions and preferences when > > > it comes to specifying a compound for a production assembly, but I would > > > like to see what this group will suggest for this new assembly we are > > > designing: > > > > > > We have a CCA on which is mounted a very large bulkhead type connector > > > which requires a form in place sealant around it where it interfaces with > > > (sticks through) the chassis. The connector is mechanically fastened to > > > the chassis with four screws but the application will see very tough > > > vibration exposure. The bond is between the connector flange (plastic) > > > and the chassis (cast aluminum) and must be capable of resisting constant > > > outdoor environment abuse such as high pressure water spray cleaning, motor > > > oils, fuels, and general dirt. > > > > > > The temp range is -40 C to +85 C, and it will not be submerged (at least > > > not intentionally) for long periods of time but moisture is the primary > > > culprit that we are trying to defeat as the CCA will not be sealed with > > > conformal coating. > > > > > > Please select your choice and tell me why? Remember, this is for > > > production so cure time, cost, and application ease are very important > > > factors. Please include whether or not the cast aluminum chassis needs to > > > be chem filmed, primed, or painted to seal its surface. > > > > > > > > --------------------------------------------------------------------------------- > > > 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 the archives of previous posts at: http://listserv.ipc.org/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 the archives of previous posts at: http://listserv.ipc.org/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 the archives of previous posts at: http://listserv.ipc.org/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 ---------------------------------------------------------------------------------