facebok Pixel

Foil, Film & Foam Tapes

SF 685

SF 685 ShurMASTIC® Butyl Foil Tape

ShurMASTIC® butyl foil tape for indoor or outdoor use to seal Class 1 Flex Duct, sheet metal and duct wrap vapor barriers, and is also approved for subgrade application on PVC-coated duct. SF 685 is a linered, paintable foil mastic on a roll that's tested in accordance with UL 723 and delivers permanent, airtight and water-resistant seals in temperatures up to 200 F.

Features & Benefits

  • Indoor/outdoor mastic foil tape
  • Linered
  • Stays supple and forms a permanent bond to substrate
  • Paintable with paint recommended for aluminum
  • Contains no asbestos, CFCs or PCBs

Related Products

SF 686

UL 181B-FX Listed and printed ShurMASTIC® indoor/outdoor roll mastic tape.

Typical Applications

  • For indoor or outdoor use to seal Class 1 Flex Duct, sheet metal and duct wrap vapor barriers
  • Also approved for subgrade application on PVC-coated duct



  • Backing: Printed, 2 mil aluminum foil
  • Adhesive: Non-flammable, butyl rubber adhesive
  • Liner: NA

Properties & Technical Data

Property Standard Metric
Adhesion to Stainless Steel 255 oz/in width 27.91 N/10 mm
Application Temperature Range 35 F to 110 F 1.7 C to 44 C
Elongation 560% 560%
Service Temperature Range -20 F to 200 F -29 C to 93 C
Tensile 25 lbs/in width 43.8 N/10 mm
Thickness 17.0 mils 0.43 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.

Applicable Standards

FSI 20/SDI 40, Pressure Classes SMACNA 1/2, 1, 2, 3, 4 & 6, Seal Classes A, B, C, Tested in accordance with UL 723

Sizes & Colors

Colors Available:

Silver Printed (SPT) Silver Printed (SPT)

Lengths Available: 30.48 m

Widths Available: 50.8 mm, 76.2 mm

Standard Core Size: 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.

Where to Buy

Shurtape Foil, Film & Foam Tapes products can be found online or nationwide at the following preferred retailers. Check our Where to Buy page for more information on where to buy Shurtape products.

MSC Direct Logo