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Foamed back tape is a functional adhesive tape made of closed-cell foamed materials (such as EVA, PE, PU, rubber, etc.) as the base material and coated with pressure-sensitive adhesive on both sides. It has multiple characteristics such as buffering, sealing and bonding. Its core structure usually includes a foaming layer, an adhesive layer and a release paper protective layer. Some high-end products also add PET film to enhance impact resistance.