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How are ferrite magnets used in refrigerator door seals?

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Hard magnetic ferrites are utilized in refrigerator door seals by incorporating them into flexible materials to create a magnetic closure that also functions as an airtight gasket.12

To achieve this, powdered ferrite is bonded with synthetic resin or rubber. This process allows for the creation of extruded strips or sheets that are semiflexible, enabling them to be easily cut and shaped to fit the perimeter of a refrigerator door. These magnetic strips provide a consistent, reliable seal that keeps the door securely closed, ensuring the appliance remains airtight.21