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How do you clean OSP PCB's without washing it off?

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Kevin W. Parker

#43947

How do you clean OSP PCB's without washing it off? | 14 September, 2006

We have begun using a PCB with Organic Surface Protectant. We normally run boards with non orgainic protectant. We can wash these boards with our ultrasonic cleaner using Zestron SC202 and a separate Hot/cold rinse system with an air knife. This removes OSP. Any ideas how to wash these boards? We also have EMC Cyberclean 3000RF systems we use to wash populated mis-printed PCB's and stencils.

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#43950

How do you clean OSP PCB's without washing it off? | 14 September, 2006

Is it your normal process to wash all your bare boards or is this in response to something abnormal? Seems like something your suppliers should be taking care of, especially with a non-washable treatment.

In answer to your question, I have no idea!

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#43953

How do you clean OSP PCB's without washing it off? | 14 September, 2006

You weren't specific about the OSP that you use. We use Entek Plus CU-106A. Yes, just about everything removes Entek, especially if there's heat involved. Ethone states: * Alcohol strips 70% of the coating * Water removes 15% * Kyzen Lonox only takes about 3%.

Enthone recommends that if you wash the board "thoroughly" (alcohol or solvent) to strip the coating and expose the copper, you should complete all soldering operations within 12 hours.

Enthone has done studies with some aqueous chemistries on mis-print solder paste applications. The proper materials selection can minimize the removal of the OSP. You might consider following your OSP supplier recommendation.

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