Electronics Forum | Mon Sep 21 20:45:55 EDT 2009 | davef
10.4. Pre-Cure Examination. Immediately after material application, the uncured conformal coating shall be examined for: a. Bubbles and Air Entrapments. These defects shall be broken by vacuum, with a sharp probe, or other appropriate tools. b. Bridg
Electronics Forum | Fri Sep 18 12:51:07 EDT 2009 | davef
There is no specification that covers all the peculiar possible situations in conformal coating. The user and the supplier should define and document coating requirements on the assembly drawing, since they are specific to the product.
Electronics Forum | Tue Sep 22 11:33:08 EDT 2009 | jdumont
Good ol NASA... thanks Dave
Electronics Forum | Mon Sep 21 15:08:46 EDT 2009 | jdumont
Thanks for the reply. I didnt consider this too peculiar a situation however, since pretty much anyone who coats boards with a thin material like acrylic prob has come across this. Maybe its time to invest in some machine upgrades! Thanks
Electronics Forum | Thu Sep 17 11:19:57 EDT 2009 | jdumont
Does anyone have a reference to a spec for this? We have a tall SMT IC that we coat with AR coating in a Asymtek spray coating machine. We do not have the angle head option to spray from a 45 so the sides of tall parts are sometimes left uncovered.
Electronics Forum | Mon Feb 05 10:21:21 EST 2007 | davef
Thermal conductivity [W/m-�C] * Silver: 418 * Aluminum: 403 * Copper [rolled annealed]: 392 * Copper [electrodeposited]: 392 * Gold: 297 * Nickel: 90.7 * Tin: 73 * SAC: 73 * Castin: 57 * Pb37Sn63: 51 * Lead: 35 * Epoxy, phenolic: 25-75 * Conformal co
Electronics Forum | Sat Oct 06 08:27:24 EDT 2001 | davef
Yes, some solder masks do not tent well, because the material is too thin. That�s the trade-off. Thin masks: * Conform well to [don't bleed onto] fine pitch features. * Tent vias poorly, requiring an additional "plugging" step. As you imply, if th
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