Printed Circuit Board Assembly & PCB Design SMT Electronics Assembly Manufacturing Forum

Printed Circuit Board Assembly & PCB Design Forum

SMT electronics assembly manufacturing forum.


di water washing

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#61752

di water washing | 3 May, 2010

I need to wash a bach of boards (25) using di water. I plan on washing them by hand. What would be the best way to go about drying them?

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#61754

di water washing | 4 May, 2010

Rinse them clean. Blow them out with some shop air. And let them dry in an oven for awhile.

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#61755

di water washing | 4 May, 2010

Only use the shop air if it is clean and dry. I know from experience that one can get water and a little oil from the compressor in the air lines.

We are in a drier climate with humidity levels in the 25%-35% range on average. All we do is let the boards air dry over night. If we need to power them up the same day we bake them in an oven at 110C for 45 min first.

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#61759

di water washing | 4 May, 2010

Good point on the shop air.

Shop air can also generate a tremendous amount of ESD. There are special nozzles you can get to minimize it.

We use our shop air mostly for blowing out connectors, and larger components that have a history of trapping water underneath them. We still bake the boards out afterwards anyway, but, with a bit of help in those instances, they dry faster. With trapped water, they could be in the oven for awhile.

cheers ..rob

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#61764

di water washing | 5 May, 2010

IPC-A-610D Sections 3.1, 3.2, and 3.3 and Table 3.1 specifically mention compressed air as a source of ESD damage

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#61766

di water washing | 5 May, 2010

Thanks for the info! What's a good type of oven for baking boards in?

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#61767

di water washing | 5 May, 2010

#61911

di water washing | 24 May, 2010

We bake all of our boards at 220 degrees F for two hours. This bakes out all the moisture. Blow off the parts prior to placing in the oven.

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