Electronics Forum: conformal coating white resdue (Page 1 of 2)

conformal coating over inspection stamps

Electronics Forum | Thu Jun 27 08:47:21 EDT 2019 | SMTA-John

Having success with Circuit Boards #432 Solvent Resistant Ink - Designed specifically for circuit boards. This medium dry ink is highly resistant to solvents .... It is also non-conducting. Note: this ink contains an aggressive solvent so should not

Issues with No Clean Resdue??

Electronics Forum | Thu May 11 15:11:14 EDT 2006 | patrickbruneel

I assume you talk about wave soldering. No-clean fluxes are widely used since 1987 or earlier and after all these years they have proven to be reliable. If you clean the board or not the dust bunnies etc. will still reach the board surface. If you us

Cleaning before Conformal Coating

Electronics Forum | Fri Sep 09 15:03:46 EDT 2005 | Amol

Hi, I am running a circuit board that needs a part to be put on it after cleaning and before conformal coating. the only problem is that after cleaning and hand assembly of the part, there is a thin whitish residue in the ckt board that one can see w

Conformal Coating High Power Electronics PCBs

Electronics Forum | Wed Jul 24 09:50:20 EDT 2019 | amitthepcbguy

To perform conformal coating of PCBs in high power electronics applications follow IPC-A-600F and IPC-CC-830B conformal coating standards. This standard enlists several performance criteria. Additionally, this standard is considered as a good referen

dendritic growth

Electronics Forum | Tue Dec 14 09:53:03 EST 2004 | paul_fisher

Yep fully functional and failed during the test. 25 to 55C in 3 hour hold for 9 hours then 55C to 25C in 3 hours hold for 9 hours then repeat. Humidity at 95 percent! Boards only part conformally coated. Growth with and without the coating. seems to

FOD

Electronics Forum | Mon May 24 19:43:46 EDT 2010 | jry74

Can anyone share some good practices to reduce FOD in the conformal coat area? I am new and trying to get my hands around a serious FOD issue. We get red, black, blue, and white fibers that gets trapped in our conformal coat, causing a lot of scopi

Coating adhesion problems

Electronics Forum | Tue Sep 21 11:34:10 EDT 2004 | davef

Several things to check are: * Ask Multicore if their flux res and your conformal coat are compatible. Conformal coats and NC flux res are notorious for having compatibily issues. * Conformal coat a bare board to determine if there is there is enoug

Cleaning before Conformal Coating

Electronics Forum | Fri Sep 09 15:53:22 EDT 2005 | patrickbruneel

If the white residue is from a no-clean flux or no- clean solder flux core you can leave it on the board. (Consult with the flux or cored solder manufacturer) Because after being encapsulated with conformal coating the residue is sealed from humidity

Cleaning before Conformal Coating

Electronics Forum | Fri Sep 09 15:50:08 EDT 2005 | chunks

The hand assembled part is soldered in? If so, the white residue may be from the operator using some added wave solder flux to get better wetting when hand soldering.

Conformal over No-Clean

Electronics Forum | Fri Apr 26 10:42:28 EDT 2002 | Jim M.

I worked for a telecom company that had sites in the deserts, jungles, mountains and regular built up area's. All boards were built using Aim 291/293 No clean solder paste. (all boards built to Bellcore standard) The boards were coated with Dymax ur

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