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.
