Suzanne, I have now apparently had enough Mt. Dew to formulate a coherent response (like YOU can talk Hillman). We have products within our system that does have parylene coating. While expensive and very production friendly, it does give a good chemically resistant coating that is uniformly deposited on all surfaces. Done properly, you have a total continuous barrier to the environment. How thick depends on the board topography, but a target of about 0.5 mil is a good figure. I have never done a study on how much or how little parylene is needed to pass salt fog tests. Lamar Young at SCS may have more data on that. On some products we have gone to parylene coating because we cannot pass some of the more stringent salt spray/fog tests with our standard acrylic coating. It is my observation that this is most often due to variability in the coating process or coating technique, rather than a shortcoming of the acrylic material itself, since the majority of our products routinely pass salt fog testing with acrylic. This testing is most often done on the top level unit, but in some cases we do it at the individual assembly level. The key to passing salt fog testing is to have a continuous barrier presented to the salt environment, whether parylene or any other form of protective coating. Doug Pauls Rockwell Collins Suzanne Nachbor <suzanne.nachbor@HON To: [log in to unmask] EYWELL.COM> cc: Sent by: TechNet Subject: [TN] Salt fog testing and paralyne <[log in to unmask] c.org> 07/07/2003 02:15 PM Please respond to "TechNet E-Mail Forum."; Please respond to suzanne.nachbor Does anyone have literature or real life testing on the performance of paralyne under a salt fog test? What thickness was required to pass salt fog testing? Was the cca directly exposed or was it inside a box/device? Suzanne Nachbor Supplier Quality Engineer/Commodity Lead Phone: 763-957-3923 Fax: 763-792-2486 e-mail: [log in to unmask] --------------------------------------------------- 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/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 1.8e 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/html/forum.htm for additional information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 -----------------------------------------------------