Shurtape SF 686 Flex Duct Foil Tape - 183431

Shurtape SF 686 Flex Duct Foil Tape - 183431

Restore an airtight seal on flexible duct connections with this universal/spec-match Shurtape SF 686 Flex Duct Foil Tape - 183431. This butyl foil HVAC tape is designed for sealing Class 1 flex duct, sheet metal, and duct wrap vapor barrier surfaces where a heavier-duty mastic-style bond is preferred.

183431 is Shurtape SF 686 foil tape, a universal/spec-match sealing tape used when flex duct connections, vapor barrier seams, or sheet metal joints need a stronger long-lasting seal. It is commonly selected when ordinary foil tape is not enough for the service conditions or surface profile.

Compatibility: Class 1 flex duct, sheet metal, and duct wrap vapor barrier applications that call for a butyl foil sealing tape with the correct size and adhesion profile.

Please confirm the tape width, length, backing material, adhesive type, and service application before ordering.

Is it time to replace?

• Common Symptoms: Air leaks at duct joints, loose vapor barrier seams, condensation around an unsealed connection, or foil tape that has lost adhesion.
• Visible/Sensory Cues: Lifted foil edges, sticky residue from failed tape, torn insulation wrap, visible gaps at a seam, or dirt streaks showing air loss.

Pro Tip: Press the tape firmly over the full seam width and avoid stretching it tight across gaps so the butyl layer can stay fully seated over time.

Technical Specifications