Electronics Forum | Thu Mar 24 11:04:41 EDT 2011 | smt_guy
Hi, I have a 2.75" x 1" x 0.027"thick CCA with SOIC16W and QFN56 as well as some 0201's, 0402's and QFN16 Components that are to be enclosed via molding process. Is there any Insert Moling, Over Molding Circuit Card Assembly Guidelines out there fr
Electronics Forum | Thu May 01 13:58:14 EDT 2003 | bremerg
Gentlemen, Does anyone have any failure information on IRC, CHP2-100-R500F (5 OHM, 2W, 1%) resistors. We have experienced two failures on the same circuit board where the metalization on the component separated from the component causing an open ci
Electronics Forum | Thu Dec 22 21:29:05 EST 2005 | davef
Josh: Room Temperature Vulcanizing (RTV) is Dow Corning's trade name for it's family of silicone cure sealants. RTV is about the worst kind of coating there is. Its chemistry is highly ionic and it requires atmospheric humidity absorbed to "complete
Electronics Forum | Fri Jul 01 20:12:16 EDT 2005 | Tom B
Steve, We use that Circuit Works pen as well! You can purchase a UV cure then download it to an opaque syringe or bottle. Use a small EFD or similar luer lock tip and dispense where needed. Tom
Electronics Forum | Thu Mar 24 15:54:43 EDT 2011 | davef
You're correct. There's no point in conformal coating a board that you intend to pot. We're aware of no IPC [or IPCish] standards or guidelines for potting or encapsulation. We'd guess that materials and / or equipment suppliers would be the best pl
Electronics Forum | Tue Mar 29 10:47:31 EDT 2011 | frcdave
I agree with Davef, there is no point in conformal coating the assembly before potting. I am also not aware of any IPC standard for potting or encapsulation. If you would like to discuss equipment for potting/ encapsulation, we would be happy to d
Electronics Forum | Sat Jan 29 13:06:18 EST 2000 | Graham Naisbitt
Todd, All liquid coatings are Newtonian - they follow gravity so they do indeed run away from sharp leads and edges. Silicones are generally worse because they have very low surface energy - although this is an asset when trying to get under compone
Electronics Forum | Wed Jul 29 21:16:17 EDT 2020 | SMTA-64387706
Hi, I have a PCB that works fine when tested before conformal coating with HumiSeal 1B73. It seems like the CC is causing electrical issues. We brush it on, so it is a bit thick. After curing we are getting QFNs that do not seem to connect well and a
Electronics Forum | Sun Mar 09 09:15:21 EDT 2008 | davef
Q1. What kind of labels/ink/sharpe can be used under conformal coating without disolving etc...? A1. While we're not familiar with the conformal coat you have selected, this might help. Label selection: The following chemically durable materials are
Electronics Forum | Fri May 02 12:41:16 EDT 2003 | Chris Lampron
Hi Chris, I had worked for a flex circuit house for 10 years. You should be able to follow your solder paste guidelines for times and temps. You may want to consider pre-baking the flex if it is made with Kapton. Kapton is Hygroscopic and will delam
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