Vybond 36717A3 Foilmastic Sealant Tape UL181B-FX 3 in

Product Description

The VYBOND 36717A3 is a wide-format aluminum foil sealant tape engineered for UL181B-FX compliant duct sealing. It combines a mastic-coated foil backing with a high-performance acrylic adhesive to form a durable, long-term air and vapor seal on flex duct, rigid duct board, and sheet metal connections. At 17 mil total thickness, the tape delivers substantial body and puncture resistance. The 3-inch width reduces lap count on larger seams and speeds application time on longitudinal joints and collars. Each roll provides 60 yards of coverage. This tape is installed by HVAC technicians and sheet metal workers as part of duct system sealing and commissioning work.

This tape is suited for residential and light commercial duct sealing applications where UL181B-FX listing is required by local mechanical codes or inspection. It performs across a wide temperature range, making it appropriate for both conditioned and unconditioned spaces including attics, crawlspaces, and mechanical rooms. The 3-inch width is particularly well matched to trunk line seams, duct board fabrication seams, and boot-to-register connections where a narrow tape would require multiple passes.

Key Features

• UL181B-FX listed for compliant flex duct and duct board sealing applications
• Mastic-coated aluminum foil backing provides a conformable, air-tight seal
• High-performance acrylic adhesive with adhesion approximately 60 oz per inch to steel
• 17 mil total thickness for durability and puncture resistance
• 3-inch width reduces application passes on wide seams and joints
• Operating temperature range of -20 degrees F to 260 degrees F

Compatibility

Designed for UL181B-FX duct sealing applications on flexible duct systems, duct board assemblies, and related duct connections where a listed foil mastic tape is specified.

Installation Notes

HVAC technicians and sheet metal workers install this tape as part of duct sealing procedures required by ACCA standards and local mechanical codes. Surfaces must be clean, dry, and free of dust, oil, or loose material before tape application to ensure full adhesive contact. Power down the air handling system before working inside duct enclosures. Do not apply over damaged or deteriorated duct board facing.

Technical Specifications

• Width: 3 inches
• Thickness: 17 mil
• Roll Length: 60 yards
• Adhesion to Steel: approximately 60 oz per inch
• Operating Temperature Range: -20 degrees F to 260 degrees F
• Listing: UL181B-FX
• Backing: Mastic-coated aluminum foil
• Adhesive Type: Acrylic

Standard Information

• Brand: VYBOND
• Manufacturer Part Number: 36717A3