Knauf Sealing tape is a closed foam tape, self adhesive on one side, permanently flexible. It is recommended for the connection of flanking constructional components with the backside of the runners in drywall partitions. For sound and fire protection requirements the Knauf sealing tape is not recommended (use the acoustical or intumescent sealant). Field of Application: Knauf Sealing Tape is a closed foam tape, self adhesive on one side, permanently flexible. It is recommended for the connection of flanking constructional components with the backside of the runners in drywall partitions.