491 FSK

Ideal Tape 491 FSK is a pressure sensitive tape manufactured with the FSK (Foil/Scrim/Kraft) backing combined with a pressure sensitive adhesive and release liner. 491D is the same product in circular disc form provided in a continuous roll.

Suggested end use

491 FSK is used for sealing cold and dual temperature duct seams and joints where FSK is the basic insulation facing. The pre-cut discs (491D) are applied over washers and cupped pin heads.  They can also be used to cover any accidental punctures in the facing.  The discs provide an excellent vapor seal when applied to clean, dry surfaces.  Use of applicator (provided) will give best results.


Adhesive typeRubber
Total thickness6 mils (0.15mm)
Tensile strength35 lb/in (153 N/25mm)
Adhesion100 oz/in (27 N/25mm)

( Id: 49 )