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Flux residues found after assembly process (Clean process)

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#75181

Flux residues found after assembly process (Clean process) | 8 January, 2016

To all the experts,

Is there any equipment (like coating uv lamp) that can detect flux residues on the pcba?

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#75182

Flux residues found after assembly process (Clean process) | 8 January, 2016

The most common method is a R.O.S.E tester. They have been around for 30 years and are an industry standard for ionic contamination (flux and other residues) testing. Manufacturers include:

Zero Ion www.aqueoustech.com

Omegameter / Ionagraph http://scscoatings.com/equipment/ionic-contamination-test/

A low cost visual test is offered by Zestron. They make a flux test solution whereby a small drop of chemical is deposited onto an assembly. The chemical will change color in the presence of flux. More info here:

www.zestron.com

I hope this information is helpful.

Mike Konrad

Aqueous Technologies

www.aqueoustech.com

konrad@aqueoustech.com

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#75185

Flux residues found after assembly process (Clean process) | 9 January, 2016

Thanks for your input Michael. Basically the boards had been go through from washing and even ionic contamination already. In order to eliminate or detect the flux residues, is there any equipment something like a uv lamp that can detect the flux from the final visual inspection stage.

I had found this equipment on the website (see below and photo attachment) and not sure if it's effective to detect the flux residue. Is anyone here used this equipment before and what is the outcome?

www.uv-light.co.uk/inspection/solderflux/

Attachments:

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#75217

Flux residues found after assembly process (Clean process) | 13 January, 2016

> Thanks for your input Michael. Basically the > boards had been go through from washing and even > ionic contamination already. In order to > eliminate or detect the flux residues, is there > any equipment something like a uv lamp that can > detect the flux from the final visual inspection > stage. > > I had found this equipment on the > website (see below and photo attachment) and not > sure if it's effective to detect the flux > residue. Is anyone here used this equipment > before and what is the > outcome? > > http://www.uv-light.co.uk/inspection/solderfl > ux/

HI:

If you are looking into an inspection tool, depending on your microscopes, you can add on a polarized contrast light filter. this will be a direct tool that can help you out on that step. Only issue with polarized light filters, or UV lamps, is that they will identify white powderish residues only. If the flux is still "untouched" it's glare wont allow for a correct observation.

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