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FSK insulation tape is designed to seal foil scrim kraft facing fiberglass duct board and pipe insulation against moisture and vapor. FSK insulation jacketing tapes can also be used for patching rips and tears in foil-facing insulation ,used with fiberglass duct wrap for added strength.

Foil-scrim-kraft (FSK) is a flame retardant, vapor-barrier,one of the most commonly used facings in the insulation industry. FSK insulation tape has a combined backing of aluminum foil, kraft paper, and fiberglass scrim. The combined backing properties result in a strong tape that provides a barrier against vapor. High-strength foil-scrim-kraft paper all laminated together using a flame-retardant adhesive.

The primary function of FSK insulation tape is to create airtight seals and joints in HVAC systems, preventing air leakage and improving energy efficiency. It is commonly used to seal seams and edges of insulation panels, wrap insulation around pipes or ducts, and secure insulation blankets in place.

FSK insulation tape is typically easy to tear by hand, making it convenient to use in various installation scenarios. It is also flame-resistant, which is important for safety in HVAC applications.

Aluminum Foil Tape Applications:

Foil scrim kraft insulation jacketing tape is used for sealing HVAC duct seams and joints where FSK is the basic insulation facing.Used for sealing and patching FSK ductwork and insulation and provides a finished look for exposed HVAC systems.

Aluminum Foil Tape Features:

  • 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.
  • High-tack synthetic rubber adhesive forms an instant bond.
  • Moisture-, mold-, and UV-resistant design.

Tape Properties:





Backing Thickness



PSTC-133 / ASTM D 3652

Total Thickness

170 Micron


PSTC-133 / ASTM D 3652

Adhesion to Steel



PSTC-101 / ASTM D 3330

Tensile Strength

120 N/25mm


PSTC-131 / ASTM D 3759




PSTC-131 / ASTM D 3759

Service Temperature

-20℃ to +80℃

-4℉ to +176℉


Applying Temperature

+10℃ to +40℃

+50℉ to +105℉


Tape Roll Size:

Finish Roll:

50mm x 50m 2” x 55yds
75mm x 50m 3” x 55yds

Log Roll: 1200mm x 50m

Jumbo Roll:1200mm x 900m