Thank you Inge, Yes, Oneida first came to mind as they do an excellent job for Rockwell when we need RGA analysis, but they said the presence of liquid would foul their analysis. Doug Pauls Inge Hernefjord <[log in to unmask]> 03/17/2011 04:23 PM To TechNet E-Mail Forum <[log in to unmask]>, [log in to unmask] cc Subject Re: [TN] Hydrogen gas analysis Hi Dough, why does he ask? Of course it's >H2 or ions of H. There are numbers of sniffers, e.g. this one: http://www.makelengineering.com/dir/Technologies/Hydrogen%20Detection/Hydrogen.htm to determine percentage is probably tricky. We use Oneida N.Y.C. As far as I remember, they can determine %age by anticipate bal > H2. I'm not a chemical guy myself. On 17 March 2011 09:09, Douglas Pauls <[log in to unmask]> wrote: Good morning all, I am posting this question for a colleague (not Hillman). Take a look at this picture which Steve has graciously posted on his web page. http://stevezeva.homestead.com/Bowed_Electrolytic.jpg This is an electrolytic capacitor and I don't have any access to the processing history. Presumably it went through reflow. My colleague would like to determine if there is hydrogen in this swelled device and if so, what percentage. There is presumably both liquid and gas inside the swelled area which would complicate any standard residual gas analysis. Hydrogen is too light for GCMS detection. OK all you chemists, how would hydrogen presence and concentration be determined here? And do you know of any commercial labs which would perform that service? Doug Pauls Rockwell Collins ______________________________________________________________________ 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.aspx?Pageid=E-mail-Forums 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.aspx?Pageid=E-mail-Forums for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815 -----------------------------------------------------