3M 7000005872 Mastic Electrical Tape 2.5in 10ft Black

Product Description

The 3M 7000005872 is a mastic-adhesive electrical tape designed for sealing applications in electrical and low-voltage wiring work. At 2.5 inches wide and 10 feet long with a 45 mil thickness, it provides a substantial, conformable layer that fills voids and creates a moisture-resistant seal around cable splices, connectors, and irregular surfaces. The mastic adhesive bonds aggressively to irregular geometries without requiring heat or special primers. Rated for a dielectric strength of 300 volts per mil, this tape meets the electrical isolation demands of field splicing and void-filling work. Electricians and cable splicers use it where standard vinyl tape cannot conform adequately to complex joint geometries.

This tape is suited for residential and commercial electrical installations where sealing integrity is the primary requirement. Typical applications include cable splice sealing, moisture exclusion at conduit entries, and void filling at connector bodies. The operating temperature range of 32 degrees F to 100 degrees F makes it appropriate for standard indoor and sheltered outdoor environments. It is commonly used alongside self-fusing or vinyl finishing tape as part of a multi-layer splice system.

Key Features

• 45 mil thickness provides robust void-filling and conformability over irregular splice geometry
• Mastic adhesive bonds without heat activation to cables, connectors, and conduit surfaces
• Dielectric strength of 300 V/mil supports electrical isolation at splice joints
• 2.5 inch width covers large-diameter cable splices in fewer wraps
• Operating range of 32 degrees F to 100 degrees F suits standard indoor and protected outdoor installs
• Tensile strength of 20 lb per inch maintains tape integrity under mechanical stress

Compatibility

Designed as an OEM-style sealing tape for use in electrical splicing and void-filling applications where a conformable mastic layer is required. Part of the 3M Series 6147 tape family.

Installation Notes

Installation is typically performed by licensed electricians working on cable splices, terminations, or conduit sealing. De-energize and lock out all circuits before beginning any splice or taping work in accordance with NFPA 70 (NEC) requirements. Clean and dry the substrate surface before applying the tape to ensure full adhesion. When used as part of a multi-layer wrap system, apply this mastic tape as the inner conforming layer before finishing with a self-fusing or vinyl outer wrap.