3" x 100' Foil Tape, Pressure Sensitive

Shurtape SF 685 ShurMASTIC Foil Tape – HVAC-Grade Airtight Sealing

ShurMASTIC SF 685 is an aluminum-foil HVAC tape engineered for permanent air-seal and moisture-barrier applications. With a high-solids, pressure-sensitive adhesive and foil carrier, this tape delivers exceptional adhesion on metal, duct-lined insulation, and other HVAC surfaces—indoor or outdoor.

Key Benefits for Contractors

• Aluminum Foil Backing: Resistant to UV, moisture, odors, and smoke.
• Strong Adhesion: 255 oz/in backing adhesion and 25 in‑lb tensile strength hold tight under pressure.
• Temperature Range: Performs from –20 °F up to 200 °F without detachment.
• Paintable Surface: Compatible with most architectural coatings for a seamless finish.
• High Elongation: 560% elongation allows for expansion and contraction without failure.

Technical Specifications

• Width: 3″
• Length: 100 ft
• Thickness: 17 mils total (foil plus adhesive)
• Backing: Dead-soft aluminum foil
• Adhesive Strength: 255 oz/in (steel)
• Tensile Strength: 25 in‑lb/in width
• Elongation: 560%
• Temperature Rating: –20 °F to 200 °F

Application Guidance

• Apply to clean, dry surfaces; wipe away oils or debris.
• Press firmly along entire length to fully activate adhesive.
• Use a roller for smooth installation on circular or textured surfaces.

Why It’s a Pro Choice

• ✔ Ideal for sealing rigid and flexible ducts, insulation joints, and penetration points.
• ✔ UL 723 flame/smoke rating supports code compliance.
• ✔ Permanent bond resists outdoor exposure and structural shifts.

ShurMASTIC SF 685 combines long-term durability, temperature resilience, and contractor-grade adhesion—perfect for HVAC airtightness and moisture control. Ideal for sheet metal, lined ducts, plenum sealing, and outdoor exposures. Specify SF 685 for professional-grade performance time after time.