Polyken 438X Extreme Weather FSK (Foil/Scrim/Kraft) Tape

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Polyken/Nashua 438X Extreme Weather FSK Tape is a Foil, Scrim, Kraft laminate tape with acrylic adhesive suitable for use in a wide range of temperatures. Used to seal and patch FSK duct boards and insulation. Provides an extra-strength seal to maintain vapor barrier integrity. Polyken/Nashua 438X is specially designed to meet high strength, tear resistant sealing tape requirements. Provides excellent adhesion to substrates over extreme temperature ranges (from -35°F to 260°F). Diamond pattern matches most FSK boards and blankets. 438X is UV, moisture and mold resistant and is non-solvent for less odor. It also has low VOC content and contributes toward satisfying EQ Credit 4.1 (Low Emitting Materials, Adhesives & Sealants) under LEED®. Meets flammability requirements for use in construction, aerospace and marine applications. Comes on a paper release liner.

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Technical Specifications

Polyken 438X Extreme Weather FSK (Foil/Scrim/Kraft) Tape Specifications

  • Adhesive: acrylic   How are adhesives different?
  • Carrier/Backing: foil/tri-directional fiberglass/paper
  • Release Liner: paper
  • Thickness: 6 mils (carrier, adhesive)    What is a mil?
  • Adhesion: 75 ounces per inch (to stainless steel)
  • Adhesion to Backing: 70 ounces per inch
  • Tensile Strength: 30 pounds per inch (longitudinal)
  • Application Temperature: -25°F (minimum)
  • Service/Operating Temperature: -35°F to 260°F
  • Flame Spread Index: 0
  • Smoke Development Index: 0
  • Certifications: UL723, FAR 25.853(a); LEED - EQ Credit 4.1
  • Core: 3" diameter
* specifications are those given by manufacturers and are not tested for accuracy
Polyken 438X Extreme Weather FSK (Foil/Scrim/Kraft) Tape View Larger ImageExtra Images Not Available
Ordering Options
Quantity:    Rolls or Cases? View Complete Pricing on all Available Sizes
Color: Silver
Roll Size: ** 3 in. x 50 yds.
$ Price per item will display once
the above selections are made.
** Adhesive tape products are NOT guaranteed to be splice-free. Sizes shipped will typically be the tape industry standard metric-cut sizes, i.e. 24mm for each 1 inch of nominal tape width ordered (rolls are approximately 5% narrower than the nominal size). Please contact us to inquire about pricing for full-cut widths; e.g. a 6 inch roll cut to 152mm instead of 144mm.
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Pricing Table
3 in. x 50 yds.
Actual Size: 72mm x 46m

(1 to 15 rolls)


(16 to 79 rolls)


(80 to 159 rolls)


(>= 160 rolls)









* see individual roll price to left







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