Foil, Film & Foam Tapes

SF 686 UL 181B-FX Listed/Printed ShurMASTIC® Butyl Foil Tape

ShurMASTIC® butyl foil tape used for airtight and moisture-free sealing of Class 1 Flex Duct, sheet metal and duct wrap vapor barriers, and is also approved for subgrade application on PVC-coated duct. A paintable, UL 181B-FX Listed mastic on a roll for indoor or outdoor use, SF 686 is designed with a butyl rubber adhesive system that can withstand wide temperature variances once applied.

Features & Applications

  • Indoor/outdoor mastic foil tape
  • UL 181B-FX Listed - clearly printed on the tape for quick identification
  • Instant, water-resistant grip to most surfaces
  • Paintable with paint recommended for aluminum
  • Contains no asbestos, CFCs or PCBs

  • ShurMASTIC® Butyl Foil Tape: SF 686


    Learn more about SF 686 in depth by exploring all of its features and uses. You can also visit to learn more about choosing and using tapes.



    Backing: Printed, 2 mil aluminum foil

    Adhesive: Non-flammable, butyl rubber adhesive

    Liner: NA

    Properties & Technical Data

    Product Nomenclature: SF 686
    Adhesion to Stainless Steel111 oz/in width12.15 N/10 mm
    Application Temperature Range35 F to 110 F1.7 C to 44 C
    Service Temperature Range-20 F to 200 F-29 C to 93 C
    Tensile23.8 lbs/in width41.7 N/10 mm
    Thickness17.0 mils0.43 mm
    Physical and performance characteristics shown above are obtained from tests recommended by PSTC, ASTM, government agencies or Shurtape Technologies, LLC, Quality Assurance and Technical Service departments and do not represent a guarantee of product performance. Individual rolls may vary slightly from these averages. The user should determine whether the product is fit for a particular purpose and is suitable for the user’s method of application before use.


    Sizes & Colors

    Colors Available: Silver Printed Red (SPT)

    Lengths Available: 100 ft

    Widths Available: 2 in, 3 in

    Sizes and colors disclaimer: Lead times may apply. Please contact Shurtape customer service for information related to stock and non-stock sizes and colors.

    Storage & Usage Conditions

    Tape should be stored in its original packaging in a cool, dry area away from direct sunlight and should be used within 12 months of date of shipment. Surfaces to which tape is applied should be clean, dry and free of grease, oil or other contaminants.

    Applicable Standards

    UL 181B-FX
    UL Listed
    Pressure Classes SMACNA 1/2, 1, 2, 3, 4 & 6
    Seal Classes A, B, C
    Tested in accordance with UL 723
    FSI 5/SDI 25

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    Where to Buy

    Shurtape Foil, Film & Foam Tapes products are available both online and at retailers nationwide. Check our Where to Buy page for more information on purchasing Shurtape products both locally and online.

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