Ideal Tape - 3491AW03000050APABI - 491 FSK Tape, 3" x 50 Yards

Item Number: IDE491350A  MFR Part Number: 3491AW03000050APABI


491 FSK Tape, 3" x 50 Yards
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491 FSK
Ideal Tape's 491 FSK is a pressure sensitive tape manufactured with the FSK Foil, skrim and kraft 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.

  • Performance All Weather Formula adhesive system provides permanent bond to FSK insulation facing
  • Scrim layer bends with the primary facing providing integrity to the insulation and a strong, finished, appearance
  • Release liner provides easy removal for efficient application on the job site
  • Available pre-cut discs reduce on site labor and provide an excellent vapor seal. For best results please use the provided applicator

California residents: see Proposition 65 Warning

Weight1.7 Pounds (Lb)
Width6 Inches (In)
Height3 Inches (In)
Country of OriginUSA
Length6 Inches (In)
BrandIdeal Tape
Adhesion Strength85 oz./in width
Application Temperature10°F to 180°F (-12.2°C to 82.2°C)
Shelf Life12 months under storage conditions of 60° F to 80° F and 50% relative humidity away from direct sunlight.
Storage Temperature60°F to 80°F (15.5°C to 26.6°C)
UV ResistantYes
Tensile Strength45 lb/in
ApplicationSeals Ducts
ApprovalsUL 723
CompositionReinforced FSK
FunctionsUsed For Sealing Cold and Dual Temperature Duct and Pipe Systems Where the Basic Insulation Uses FSK Facing
Maximum Temperature180°F (82.2°C)
Size3" x 150'
StandardsUL 723 rated (10/10 Flame/Smoke Rating)
Thickness7 Mils
TypeBacking: FSK(Foil/Skrim/Kraft); Adhesive: Performance Rubber
UL ListedYes
UL RecognizedYes