Mark - Not a problem. Just remember that with all things that sound too good to be true - sometimes they don't quite live up to expectations. I've had times where I left it too long, or too hot, and it doesn't look pretty.... I have often wanted to try this stuff heated, but with ultrasonics to help break up the matrix a bit more. Unless there were large voids, I would not expect the wirebonds to be affected by the U/S as they were uncovered, but... Good luck and vent! Steve Creswick Sr Associate - Balanced Enterprise Solutions http://www.linkedin.com/in/stevencreswick 616 834 1883 -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Woolley, Mark D. (Mark) Sent: Thursday, October 11, 2012 11:34 AM To: [log in to unmask] Subject: Re: [TN] Glob Top removal Sorry, Steve, Didn't read far enough. Thanks, mark -----Original Message----- From: Paul Edwards [mailto:[log in to unmask]] Sent: Thursday, October 11, 2012 9:11 AM To: Woolley, Mark D. (Mark); 'TechNet E-Mail Forum' Subject: RE: [TN] Glob Top removal A little busy there, Mark... Steve made the reference... Paul Paul Edwards Process/Quality Engineering Surface Art Engineering -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Woolley, Mark D. (Mark) Sent: Thursday, October 11, 2012 8:08 AM To: [log in to unmask] Subject: Re: [TN] Glob Top removal Thank you much Paul. I will get some and try it. mark -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Paul Edwards Sent: Thursday, October 11, 2012 9:00 AM To: [log in to unmask] Subject: Re: [TN] Glob Top removal Great Steve... Just what I've been looking for... Paul Paul Edwards Process/Quality Engineering Surface Art Engineering -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Steven Creswick Sent: Thursday, October 11, 2012 2:38 AM To: [log in to unmask] Subject: Re: [TN] Glob Top removal Mark, I used to use a material called Decap from Dynaloy - based out of Indianapolis, IN. Here is their web site. http://www.dynaloy.com/dynaloy-chemical-solutions-products/specialty-che mist ries/epoxy-products.html The Decap will work for many glob tops, but you must keep an eye on temperature. Some are removed better with warm temps, others with hot temps. You really have to test for yourself unless you know the composition of the glob top material. DO NOT use without a vented hood. The stuff reeks something terrible. Make you wish you lived next to a pig barn! What I would do is suspend the part in the solution and periodically shake it around a bit to dislodge the silica particles from the 'glob', thereby exposing new epoxy to the chemical. It is not perfect, but is far less hazardous than fuming nitric! They also have materials for Urethane CC removal, but not necessarily localized removal... Steve Creswick Sr Associate - Balanced Enterprise Solutions http://www.linkedin.com/in/stevencreswick 616 834 1883 -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Woolley, Mark D. (Mark) Sent: Wednesday, October 10, 2012 11:59 PM To: [log in to unmask] Subject: [TN] Glob Top removal Does anyone know of a way to remove the epoxy that is used to cover CoB ICs, while maintaining the integrity of the PWB-CoB Assembly afterwards? I have tried hot Nitric Acid, which does remove the epoxy nicely, but also removed the copper on the PWB and swelled during the decap process and ruptured the bondwires. I believe Red Fuming Nitric would also swell the epoxy lifting the bondwires. Most aggressive solvents don't remove epoxies well. So I am pout of ideas at present. Thanks, mark ______________________________________________________________________ This email has been scanned by the Symantec Email Security.cloud service. For more information please contact helpdesk at x2960 or [log in to unmask] ______________________________________________________________________ ______________________________________________________________________ This email has been scanned by the Symantec Email Security.cloud service. For more information please contact helpdesk at x2960 or [log in to unmask] ______________________________________________________________________ ______________________________________________________________________ This email has been scanned by the Symantec Email Security.cloud service. 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