Compressed powder is a good description. If i roll a piece between my fingers it crumbles to dust like a chunk of talc would. If you don’t see much talc then think dried mud.
EMI shielding makes sense. So maybe the binder broke down over time and then a little ride through UPS shattered it. Get Outlook for iOS<https://aka.ms/o0ukef> ________________________________ From: AF <af-boun...@af.afmug.com> on behalf of Forrest Christian (List Account) <li...@packetflux.com> Sent: Wednesday, June 19, 2024 3:35:02 PM To: AnimalFarm Microwave Users Group <af@af.afmug.com> Subject: Re: [AFMUG] Grey stuff coming off a circuit board - what is this stuff? Guess this is common. https://leadertechinc.com/ferrite-cable-shielding/special-purpose-shielding-bar-2/ The engineer in me now wonders if one is on the bottom also. On Wed, Jun 19, 2024, 1:32 PM Forrest Christian (List Account) <li...@packetflux.com<mailto:li...@packetflux.com>> wrote: I'm guessing some sort of ferrite for emi/emc shielding. Not 100% sure as I've never seen or heard of it being deployed this way. Is it rubbery or more like hard compressed pieces. I.E dried out licorice (rubbery) vs smarties (compressed sugar)? If it's hard and seems like compressed powder that's more like ferrite. Either way, I'm guessing it's fine. Looks more like a CYA or pass FCC test type of thing. On Wed, Jun 19, 2024, 12:08 PM <dmmoff...@gmail.com<mailto:dmmoff...@gmail.com>> wrote: I received a used Arista switch, and I noticed it rattled. I opened the cover and dumped out this grey debris. I looked on the circuit board and I see the stuff clearly came from some kind of border around the switch’s ASIC. What is this stuff? Is the switch likely to operate without it? -Adam -- AF mailing list AF@af.afmug.com<mailto:AF@af.afmug.com> http://af.afmug.com/mailman/listinfo/af_af.afmug.com
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