The function of moisture-sealing tapes such as vinyl, rubber, and mastic products is to exclude moisture from the insulation assembly and provide electrical insulation. One of these tapes — or alternately a mastic pad — generally forms the second layer of the insulation assembly. Rubber, mastic, and filler tapes are also used to pad the underlying surface by covering sharp edges.
4. Adhesive Quality The adhesive used in the insulation tape should offer strong bonding to various surfaces, ensuring that the tape remains in place under operational conditions. It must also be formulated to endure environmental factors.