3M used to make a paint for optics which has a reflectivity near 0%. It has a very volatile solvent that flashes off when baked. We used it in spectrofluorometers we used to make. Never contaminated mirrors or the grating. I wouid be interested to hear if they still make it. Bob Landman H&L Instruments, LLC Sent from my iPhone On Mar 29, 2010, at 8:24 AM, "Glidden, Kevin" <[log in to unmask] > wrote: > Good Morning, and Happy Monday. > > A couple of questions for anyone: > > We have a lighting application where we are getting light reflection > off two specific solder joints (we're so lucky to still use Sn63Pb37 > they are just TOO shiny!), so I am looking for a method to cover > those joints with a black (or dark gray) sealant. This would need > to be a low out-gassing material. Does anyone know of any such > material? Is there such a thing as black pigmented conformal coating? > > The second question would be for this same product. I also have a > need to seal around the base of some LEDs to prevent moisture > ingress to the bottom only terminations. Would perimeter sealing be > sufficient? How does one determine when they need to underfill vs > perimeter seal? > > Thanks! > > Kevin Glidden > > ______________________________________________________________________ > This email has been scanned by the MessageLabs Email Security System. > For more information please contact helpdesk at x2960 or [log in to unmask] > ______________________________________________________________________ > > --------------------------------------------------- > Technet Mail List provided as a service by IPC using LISTSERV 15.0 > 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 > ----------------------------------------------------- > ______________________________________________________________________ This email has been scanned by the MessageLabs Email Security System. For more information please contact helpdesk at x2960 or [log in to unmask] ______________________________________________________________________ --------------------------------------------------- Technet Mail List provided as a service by IPC using LISTSERV 15.0 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 -----------------------------------------------------