Electronics Forum: conformal coat on aluminum clad pcb (Page 1 of 3)

BGA on conformal coated PCB

Electronics Forum | Fri Feb 13 09:46:51 EST 2004 | roertner

You might want to check int using a BGA underfill material prior to coating.

BGA on conformal coated PCB

Electronics Forum | Thu Feb 12 14:26:22 EST 2004 | Kris

Hi all, We have a PCB without any BGAs on it which goes into harsh environment.We therefore conformal coat it. After assembly the PCBs are expected to withstand "85degc/85%RH for 1000 hours" We now want to add a BGA to the PCB. Does any one have

BGA on conformal coated PCB

Electronics Forum | Fri Feb 13 09:17:11 EST 2004 | Kris

we are worried about the coating not being able to cover underneath the BGA. If the coat is excessive then it would cause CTE issues. Also if anybody has data on 85/85, 1000 hrs after conformal coating of BGA, would appreciate if you guys can share

BGA on conformal coated PCB

Electronics Forum | Thu Feb 12 16:57:52 EST 2004 | blnorman

Why can't you conformally coat the BGA? We do on some of our lines with no adverse affects.

BGA on conformal coated PCB

Electronics Forum | Fri Feb 13 14:50:57 EST 2004 | blnorman

Underfills could improve reliability. If you pick materials right, you could co-cure and underfill and coating.

defect on PCB acrylic conformal coating

Electronics Forum | Thu May 09 13:49:24 EDT 2013 | davef

First, it appears that your solder mask and your coating material appear to be incompatible. Second, IPA leaves a residue that's probably not compatible with your coating material, either. IPC-HDBK-830 - Guidelines for Design, Selection and Applic

defect on PCB acrylic conformal coating

Electronics Forum | Thu May 09 10:12:08 EDT 2013 | wahahasteven

this is one of my project. I have tried to remove coating only on those areas with alcohol and thinner, then program the machine to coat the removed area again. But the result obviously shows that two different tones of coating on the board. I also

defect on PCB acrylic conformal coating

Electronics Forum | Wed May 08 14:24:22 EDT 2013 | wahahasteven

we are using acrylic conformal coating on the PCB. Under the same program, same parameters (not changing anything on the machine), and we always found one or two boards have some spots which are not coated (shown as picture). The location of the spot

defect on PCB acrylic conformal coating

Electronics Forum | Wed May 08 20:14:24 EDT 2013 | davef

What happens when you rework those non-coated areas? Please list your rework steps Br, davef

Bubbles on solder joint(after conformal coating curing)

Electronics Forum | Fri Dec 18 09:07:24 EST 2009 | tommyg_fla

dave, where I work they are having the same problems with 1B31 acrylic. The coating thickness is 6-8 mils dried so that have to do several passes with an air dry between them and a final oven cure. They think that it might be related to the heating r

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