3M 7100018679 Urethane Foam Tape 4318 3/4in X 36yd Charcoal

Product Description

The 3M 7100018679 is a single-coated, open-cell urethane foam tape designed for sealing applications in trade and industrial environments. Known as the 3M Urethane Foam Tape 4318 in charcoal gray, this product is soft and conformable, allowing it to compress and conform to irregular surfaces for an effective seal. At 1/8 inch thick and 3/4 inches wide on a 36-yard roll, it delivers continuous coverage for moisture, dust, and draft exclusion in HVAC, construction, and mechanical system installations. Licensed tradespeople and contractors rely on this tape for reliable sealing performance on gaps, joints, and penetrations.

This tape is suited for residential and light commercial applications where a flexible, compressible seal is needed. Common uses include HVAC duct sealing, door and window draft sealing, panel gap filling, and vibration dampening around mechanical components. The open-cell urethane foam construction allows it to compress into tight spaces while maintaining contact with both surfaces. It is a practical choice for HVAC technicians, plumbers, and general contractors working on air infiltration or moisture control tasks in both new construction and retrofit scenarios.

Key Features

• Open-cell urethane foam construction conforms to irregular and uneven surfaces
• Single-coated design for straightforward application to one mating surface
• Seals against moisture, dust, and drafts in mechanical and building envelope applications
• 1/8 inch thickness provides compressible cushioning in gap-filling scenarios
• 36-yard roll length reduces splice frequency on longer runs
• Charcoal gray color blends with dark substrates common in HVAC and mechanical spaces

Compatibility

Designed as an OEM-style sealing tape for use in residential and commercial HVAC, construction, and general mechanical applications where a soft, compressible foam seal is required.

Installation Notes

Surface should be clean, dry, and free of oil or loose debris before applying the tape for best adhesion. Press firmly along the tape length to ensure full contact with the substrate. No special tools are required, though a sharp utility knife or tape dispenser is recommended for clean cuts. Follow applicable building codes and manufacturer guidelines when using foam tapes in air sealing or fire-rated assembly applications.

Technical Specifications

• Width: 3/4 inches
• Length: 36 yards
• Thickness: 1/8 inch
• Color: Charcoal Gray
• Foam Type: Open-cell urethane foam
• Coating: Single-coated
• Unit of Measure: Roll
• Weight: 0.64 pounds
• UPC: 00051131064485

Standard Information

• Brand: 3M
• Manufacturer Part Number: 7100018679