3M urethane foam tape 4108 is comprised of a firm, high-density, open-cell foam with a pressure sensitive acrylic adhesive on one side. The adhesive is protected by a silicone treated paper liner. It offers excellent cushioning characteristics while allowing air or gas vapors to pass through, while providing high absorbency to seal out moisture, dust and drafts. It can perform under a wide range of temperatures. - This tape will adhere to a variety of substrates and can be used in numerous applications to dampen sound and create a clean and durable product. Allows air or gas vapors to pass through for a breathable seal.