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About chemical masking

I have AL-6063-T5 parts to be black anodized, but some certain area needs to be masked for EMC concern. I was told there is a kind of chemical or lacquer which is good with masking. Can you give suggestion what chemical should be applied? Thanks.

Michael Qiu
aluminum processor - Qingdao, China
December 10, 2008

There are several methods you can use. From hand laid tapes & paints to plotter cut adhesive film to photomasks produced by photosensitive sprayed or laminated films. The latter were developed to produce microcircuits with use of a negative (black and transparent image) of the areas you want to mask. The resolution you can get with this method goes down to microns but requires a dedicated installation for consistent results.

Guillermo Marrufo
Monterrey, NL, Mexico
December 17, 2008

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