Brian and Juan, Is HCFC-225 still legal to use? With the alcohol and HCFC-225 azeotrope, it should perform as well as HCFC-141B. Lee Whiteman, PMP Senior Member Engineering Staff L-3 Communications East Telephone: (856) 338-3508 FAX: (856) 338-2906 E-Mail: [log in to unmask] -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Brian Ellis Sent: Tuesday, September 30, 2008 9:27 AM To: [log in to unmask] Subject: Re: [TN] Big problem when coating with Parylene C. Re: bans on HCFC-141b This substance was banned from use as a solvent on 1 January 2002 across the EU (EC Regulation 2037/2000). There are certain exemptions to the HCFC use ban e.g. a temporary exemption for precision cleaning of electrical and other components in aerospace and aeronautics applications where the use ban shall enter into force on 31 December 2008. If you are not in that industry sector exemption, you should not be using it. If you do fit into that exemption, you have exactly three months to qualify a substitute cleaning process. Sorry, but that's the law. Brian Juan T. Marugán wrote: > Good evening from Spain. > > The problem we have is the following. After soldering, we conformal coating a > class 3 polyamide board (blind vias) with Parylene C. Until this moment, all is > OK. > > Then, the board pass the ESS -thermal cycling-, and it is at this moment > when appears a halo around the solder joints. The test tape performed in that > area fails. I�ll send some pictures to Steeve Gregory for reference. > > We have coated at the same time (and processed in the same conditions, > that is soldering, cleaning�) the �suspicions� polyamide boards with other type > of boards (polyamide & rigid). We only obtain negative results with the first > ones. > > We have sent some boards to an external lab for FTIR testing, and we are > waiting for the final results. > > Our though is that cause of the problem is the PCB, but we need to > demonstrate it. It's like some contaminant appears under the conformal > coating caused by the temperature (from the inner layers of the PCB?) > > So, what we need is that somebody turns the �light� on. > > Thank you for your help. > > > > Juan T. Marugán López > Supply Chain Management > Indra Sistemas SA (Spain) > > [log in to unmask] > www.indra.es > > --------------------------------------------------- > 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 > ----------------------------------------------------- > --------------------------------------------------- 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 -----------------------------------------------------