Further information on application of conformal coatings can be found at http://www.humiseal.com/technical_literature.html Best Regards David Greenman Managing Director HumiSeal Europe Ltd A British Manufacturer : Part of Chase Specialty Coatings [log in to unmask] www.humiseal.eu www.chasespecialtycoatings.com ========================================== HumiSeal Europe Ltd Registered in England & Wales No : 1480710 Registered Office : Albany Park, Frimley Road, Camberley, Surrey, GU16 7PH -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Kathy Kuhlow Sent: 02 January 2008 16:18 To: [log in to unmask] Subject: Re: [TN] Looking for Coating Comparison Another source would be the EMPF publication EMPF TP200104 - Tips on Conformal Coating (April 2001). Kat -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Douglas O. Pauls Sent: Wednesday, January 02, 2008 10:16 AM To: [log in to unmask] Subject: Re: [TN] Looking for Coating Comparison Happy New Year Bill, Some of what you are looking for can be found in the IPC-HDBK-830, the Conformal Coating Handbook. I have copied section 8.4.4 on application methods below. There are sections on each of the various coating application methods in that Handbook which go into greater detail. Graham Naisbitt, who does a great deal more work in dip coating than I do, may have a more succinct summary. Doug Pauls Rockwell Collins 8.4.4 Application Method Automated or selective applications can coat down to 0.025 mm [1 mil] minimum in many applications, while more coverage is easily achievable, even beyond 0.20 mm [8 mil] in a single pass. Manual applications (brushing, hand spray, aerosol) can also be utilized over a wide spectrum of coating thickness, though this should be accomplished over multiple, thinner applications. Part consistency over time can be difficult to ensure in manual operations. In a dipping application, coating thickness can be greater and is highly dependent upon immersion and withdrawal speeds, coating viscosity, and solids content. A basic rule of thumb is that the slower the withdrawal speed, the thinner the coating. When spray coating, shadowing of components may prevent that surfaces beneath them from being coated. Thus, any circuitry located beneath components may have poor protection. When area array packages are used, spraying may no longer be an acceptable application method. By using selective coating, extra coating material may be added at critical locations. Also, a second coating layer can be applied to get better coverage. Then, all sharp points and edges should have been smoothed by the first layer. Bill Kasprzak <[log in to unmask]> Sent by: TechNet <[log in to unmask]> 01/02/2008 10:06 AM Please respond to TechNet E-Mail Forum <[log in to unmask]>; Please respond to Bill Kasprzak <[log in to unmask]> To [log in to unmask] cc Subject [TN] Looking for Coating Comparison Happy New Year to one and all. It sure was difficult this morning to start the old grind again. Well, I'm thinking just 8 more years and I hope I can retire, so the end is in sight. I'm looking into whether there has ever been a comparison study done that gives the pros and cons for conformal coating application. I'm sure there has been because I remember reading about it. Right now I can't seem to find any information on it. Specifically, I'm looking for something that states that Dip coating provides better coverage than Spray coating. Any suggestions? Thanks in advance for any responses. --------------------------------------------------- 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 ----------------------------------------------------- --------------------------------------------------- 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 -----------------------------------------------------