Parylene is really tough, according to https://www.nbtc.cornell.edu/sites/default/files/Parylene%20Information%20Sheets.pdfgeedigity said:What if you froze the boards and then gave them a couple whacks with a hammer. If regular freezing doesn't work, you could try liquid nitrogen. I just wouldn't freeze the board solid though. I have never tried it but I have worked with liquid nitrogen. It seems that it would allow for the coating to easily shatter. Make sure you wear insulated gloves, apron, pant legs over boots (the other way can hurt if you spill it) and a face shield.
I had a couple of depopulated boards in copper chloride so long that it totally dissolved the copper conductors under the solder mask, I think it was a few years between putting them in copper chloride and I finally decided to do something about it. To get the gold I scrubbed the cards with a steel brush and then dissolved the gold from the solder mask and gold mixture.Steel panels coated with Parylene C and chilled in liquid nitrogen at -160° C withstood impacts of more than 100 in-lb in a modified Gardner falling ball impact test. This compares with values of about 250 in-lb at room temperature.
snoman701 said:Anybody tried tetrahydrofuran per US patent US4734300 to Hughes?
Supposed to penetrate the parylene, and is otherwise a pretty mild solvent.
My biggest concern being the everpresent danger of organic compounds / strong acids.
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