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ESD Systems.com expertise is ESD control products, not blocking RFID signals. From what we know the Moisture Barrier Bags would likely be a solution. See our Protektive Shield™ ESD Shielding Moisture Barrier Bags on our website.
The customer should evaluate to determine the effectiveness in addressing the purpose of blocking RFID signals. ESD Systems.com has no test data in this regard. As ways, taken from the ESD Systems.com Limited Warranty “Before using, users shall determine the suitability of the product for their intended use, and users assume all risk and liability whatsoever in connection therewith.”