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How can I do to dissolve that black resin/silicon/epoxy that is used in common key tags (to secure the chip and antenna) inside the plastic "case" ?
I am sure there is some specific chemical liquid mixture that can do it without damaging the antenna or the chip.
Any idea ? I believe that is what people use when they want to decapsulate a chip for analysis ?
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- Acetone (for weak resins, expecially soft ones - many hours to have some effects and you need to remove often the weakened resin surface and put the resin again inside acetone)
- Paint stripper (for most hard resins - I prefere the gel formulation; this one is really quicker than acetone)
- Welder+fluxant (if the above 2 methods don't work)
- Concentrated Nitric Acid [more than 70%] (very very dangerous and toxic, use it as very last chance, in proper environment, with proper devices and with lot of precautions).
Last edited by asper (2013-06-30 09:07:22)
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Very interesting post.
Thank you asper
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FYI - Acetone works on HID readers. But like asper said, the process is slow.
* Also, some chemicals will eat components.
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Acetone seems to be doing the trick !
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Acetone did the job after 2 days.
The result is a very fine layer of plastic containing antenna+chip.
I am guessing that the resin around the antenna/chip is bit harder to remove.
But anyway, the layer is not thicker than the chip. So I am happy with the result !
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