Nashua 1086865 Foil Mastic Tape 3in X 100ft UL181B-FX

Product Description

The NASHUA 1086865 is a foil-backed butyl mastic tape designed for sealing and connecting flexible duct systems in residential and light commercial HVAC applications. Sold as the Nashua 367-17, this tape combines a reinforced aluminum foil facing with a butyl adhesive compound to create a durable, airtight seal on flex duct joints and connections. It carries UL181B-FX listing, meeting the performance requirements for pressure-sensitive tape used on Class 1 flexible air ducts and air connectors. Each roll measures 3 inches wide by 100 feet long, providing substantial coverage for field work.

This tape is used by HVAC technicians installing or repairing flexible duct systems in attics, crawlspaces, and mechanical rooms. It is suited for sealing duct collars, boot connections, and splices where a listed, code-compliant tape is required. The butyl adhesive maintains adhesion across a range of temperatures, making it appropriate for both supply and return air applications in residential and light commercial systems.

Key Features

• UL181B-FX listed for use on Class 1 flexible air ducts and air connectors
• Foil and butyl construction provides a conformable, airtight seal on irregular surfaces
• 3-inch width allows coverage of standard flex duct collars and boot connections in a single pass
• 100-foot roll length reduces mid-job roll changes on larger installs
• Meets code requirements where UL181B-FX listed tape is specified by the IFGC or local mechanical codes

Compatibility

Designed for use on Class 1 flexible air ducts and air connectors where UL181B-FX listed pressure-sensitive foil tape is required per manufacturer instructions and local mechanical codes.

Installation Notes

This tape is installed by licensed HVAC technicians or qualified mechanical contractors. Power down the air handling system before working on duct connections. Clean and dry all mating surfaces before applying the tape to ensure full adhesive contact. Follow the flexible duct manufacturer's installation instructions and applicable local mechanical codes for overlap and sealing requirements.

Technical Specifications

• Width: 3 inches
• Length: 100 feet
• Construction: Foil and butyl mastic
• Listing: UL181B-FX
• UPC: 742366010155

Standard Information

• Brand: NASHUA
• Manufacturer Part Number: 1086865