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No expert by any means but one possible option might be MXene developed at Drexel University with the claim that you just had to dip cotton/linen cloth in that was very effective in blocking 99.9% of electromagnetic waves, if true don't think it would be that expensive or weighty?


[URL unfurl="true"]https://www.sciencedaily.com/releases/2020/12/201211115503.htm[/URL]


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