Anodized surface and corrosion resistance will covered at box level test. as for plated surface, particularly, Sn or Zn plated surface, you are concerned on three issues: corrosion (will covered by envrionmental test, such as salt test, damp heat etc.), plating/anodization quality (covered by mil std) and functional test (do what ever you suppose to protect, e.g. sand blast etc.). Material compatibility possibly place more role: ionic causes corrosion that impact on the contact of EMI shield capability, etc.etc. I am sure the design have requirements on the environmental spec, which translate to the box level spec on sub-assembly. my 1.73 cents. jk -----Original Message----- From: TechNet [mailto:[log in to unmask]]On Behalf Of Dehoyos, Ramon Sent: Monday, February 20, 2006 3:48 PM To: [log in to unmask] Subject: Re: [TN] NaCl Contamination levels on Plated Metal Parts The main reason for Sodium Chloride limits on a board is to prevent dendrites forming between two points and creating a damaging short. As stated below, there is a latent risk if there is salt in the vicinity of a PWA. Now if the chances are very low that this salt will travel, or the board is coated and the board is going to be used in the desert(low humidity), then I would not worry too much about it. One man's opinion. Regards, Ramon -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Graham Naisbitt Sent: Monday, February 20, 2006 1:11 PM To: [log in to unmask] Subject: Re: [TN] NaCl Contamination levels on Plated Metal Parts Hi Andrew This would not apply to metal housings as described only to the electronic circuit assembly. Mark you, if there is yukky stuff on the metal housing and the housing drips condensation onto the circuit assembly that might then contain some of this yukky stuff...then you might have a problem. Hope it helps Graham Naisbitt On 20/2/06 18:00, "Joseph H. Smith" <[log in to unmask]> wrote: > Fellow technetters, > > I realize that there is an expected specification levels for the NaCl > contamination of PCB's. Pardon me if I may be asking a dumb question, > but does plated metal such as housings and the like be under the same > specification limits for NaCl? Are there guidelines or documentation within > the industry which state this value? These are metals that may come > in close proximity to the PCB but necessarily mounted on the PCB. > > Andrew Kettlewell > Sr Process Engineer > Sypris Electronics > Tampa, Fl > ___________________________________________________ > Try the New Netscape Mail Today! > Virtually Spam-Free | More Storage | Import Your Contact List > http://mail.netscape.com > > --------------------------------------------------- > Technet Mail List provided as a 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 > 847-615-7100 ext.2815 > ----------------------------------------------------- > --------------------------------------------------- Technet Mail List provided as a 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 847-615-7100 ext.2815 ----------------------------------------------------- --------------------------------------------------- Technet Mail List provided as a 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 847-615-7100 ext.2815 ----------------------------------------------------- --------------------------------------------------- Technet Mail List provided as a 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 847-615-7100 ext.2815 -----------------------------------------------------