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Liquids, metals, and RFID

It’s been long known due to the physics involved that the use of RFID around liquids or metal products or packages results in poor read performance.

In short, considering that nearly half of grocery products are items made of or containing either metal and/or liquid, this is a hurdle for broad-based acceptance of RFID in food, beverages, and other product categories.

It’s an aspect that’s been the focus of academic and industry research programs for some time; several vendors have addressed this area with specific products that you can search for on the Internet. There are also these “tricks of the trade” we’ve come across over the years to help improve RFID read performance in the presence of liquids or metal:

• Employing a polymer foam or other material that acts as a spacer to separate or insulate the RFID tag from the container.

•  Consider a "flag tag" in which a portion of the label with the RFID inlay folds out 90 deg from the load.

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