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Seal and Protect with 3M Mastic Electrical Tapes

  • Connections with irregular shapes are at risk of corrosion, especially in humid environments.

    To solve the problem of protecting odd-shaped conductors, 3M scientists created mastic electrical tapes from their knowledge of adhesive technology. 3M mastic tapes are made of thick, flexible material that pads quickly and efficiently around sharp angles and small crevices. When applied, they create a smooth taping surface that reduces the risk of water damage.

    Discover which 3M mastic electrical tape to use for each application.


When to Use Mastic Electrical Tapes

Moisture Sealing

Explore all 3M electrical tapes for sealing

Moisture in humid industrial environments can damage exposed metal conductors. Use 3M mastic electrical tapes to create a thick, water resistant seal. Even when punctured, the mastic will continue to protect the conductors with its self-healing properties that flow to fill in the void.

Choose these 3M mastic electrical tapes for a moisture-tight seal.

  • Scotch Rubber Mastic Tape 2228
    • Moisture-seal cable and wire connections, ground wire and rod connections, and service drops
    • Self-fusing material, EPR backing to help resist liquid ingress
  • Scotchfil Electrical Insulation Putty
    • Moisture-seal for ground wire exit points in high-voltage splices
    • Moisture-seal in multi-conductor cable connections

Shaping and Padding

Splices with sharp corners, bolted connections on bus bars, irregular shapes and rough surfaces must be insulated with mastic tapes to prevent air pockets and punctures. 3M mastic electrical tapes are highly flexible and conform over odd-shaped components. They can be tucked into hard-to-reach spaces, resulting in a smooth, uniform wrap.

Find out which 3M mastic tape to use for different cable irregularities.

  • Scotchfil Electrical Insulation Putty
    • Seal sharp edges and major irregular shaped surfaces and voids, such as fittings and valves
    • 125 mil thickness
    • 1000% elongation at break
    • Soft, easy to mold by hand, even at 0°C
  • Scotch Rubber Mastic Tape 2228
    • Seal bus bar, bolted connections and irregular surfaces
    • 65 mil thickness
    • 1000% elongation at break
    • Vibration padding for motor leads rated up to 1000V

Insulation for Outdoor Use

Explore all 3M electrical tapes for outdoor use

Jackets of connectors in outdoor environments are at risk of cracking due to sun exposure, leaving the wire vulnerable to rain damage. 3M mastic electrical tapes have thick, stretchy material made for weather-exposed applications. Their heat, UV and moisture-resistant attributes reinforce the security of the connection.

Below are weather-proof 3M mastic electrical tapes.

  • Scotch Rubber Mastic Tape 2228
    • Primary insulation for cable and wire connections rated up to 1000V, and bus bar connections rated up to 35kV
    • Can be used on copper or aluminium conductors rated at 90°C
  • Scotchfil Electrical Insulation Putty
    • Insulate connections and irregular surfaces rated up to 600V
    • Maximum operating temperature of 80°C

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