Norseal PVC medium density foams are most suitable for common air and water seals. When uncertain as to which foam to select (soft, medium or firm), the medium foam range is the safest starting point as it offers balanced properties for most gasketing applications. Norseal PVC medium grade foams are provided with a pressure sensitive adhesive on one side for ease in placement. The paper release liner ensures the foam is protected and eliminates any stretch during the application. The medium density foam allows for balanced properties for air and water sealing. The closed cell foam ensures adequate air, dust & water seal when compressed 30%.