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Conformal Coat over No-Clean

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Tim

#62068

Conformal Coat over No-Clean | 16 June, 2010

A customer wants to coat a no-clean assembly to cut cost and cycle time. I know what wave flux I can use to make it work, but the Indium SMQ92J paste we use causes dewets. Any other no-clean pastes out there that play nice with acrylic?

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#62153

Conformal Coat over No-Clean | 30 June, 2010

Tim, try and incorporate an inline wash system. We use one with a surfactant and it cleans the "NO CLEAN" fluxes well. If you dont have an inline system, you can manual clean the boards with an surfactant and IPA. You can also do an ionic contamination test to ensure the cleanliness of the board prior to conformal coat.

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#62157

Conformal Coat over No-Clean | 1 July, 2010

Hi Tim, I would speak to your guys at Indium, as I am sure they have a paste developed primarily for Conformally Coated products which should alleviate your problems.

John

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#62304

Conformal Coat over No-Clean | 23 July, 2010

Please wash the PCB`s before conformal coating.Do you use deodrant before or after you shower??????

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#62317

Conformal Coat over No-Clean | 26 July, 2010

Beyond just the cosmetic dewets reliability is very flux/coating dependent. Don't forget about any touchup or hand soldered parts after wave as well.

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