Rubber Electrical Tape. Pads, Helps Protect and Insulate up to 69kV.

  • Image showing application of EMD Linered Rubber Splicing Tape 23 to motor lead cable

    Primary Insulation helps keep the lights on.

    Electricians have critical jobs. Keeping our world powered requires concentration, knowledge and skill. Some of the most dangerous work is done by electricians working on medium and high voltage applications. Ethylene propylene and silicone rubber electrical tapes have the highest dielectric rating of electrical tapes made by 3M and are a trusted product in the toolbox of most medium and high voltage linemen and installers. With proper wrapping, their self-fusing properties help to eliminate voids in critical areas that may cause catastrophic failures .

    But there is more. Pros know that rubber tapes can offer more than just high voltage insulation and are often used in a variety of low voltage applications as well.

    To evaluate rubber tapes for your application, click here.

Proper Wrapping

Shouldn’t snap when you wrap.

  • Wrapping tape on a high voltage cable can be time consuming and error prone since the careful build-up of tape requires accurate half-lapping and constant tension in order to reduce build-in air voids. Rubber tapes are designed to stretch−some up to 1000%. Elongating the tape this way drives to compression, and that results in the strong self-fusion that provides great insulation and moisture protection.

    In a typical tape splice, you’ll tug and pull out the tape, stretching it to just before the breaking point. The tape’s width narrows to about 1/3rd of its original size. The tape’s length increases; your hand travels very quickly up to 20” away from where you started. Quite often you’ll be wrapping in a tight location making this even more difficult. Proper taping techniques are critical to realizing the many performance benefits of rubber tape.

Illustrations depicting proper wrapping techniques: a roll of tape wrapped once around cable, tape wrapped in half-lapped layers, tape stretched away from cable to show tape narrowing and elongating 500-1000% of length, tape being backwound on roll
    • Backwinding rubber tape allows you to tuck the excess back onto the roll as you work, pacing out more as you make your half laps around the cable and helping prevent the tape from getting progressively further away from the work area.
    • Even pressure on the stretch helps eliminate voids and bulges, sometimes called ‘pregnant splices’.
    • A good rubber tape won’t snap and break when you wrap.
    • Splices and terminations should always be jacketed with vinyl tape for protection from chemical contaminants and physical damage. Vinyl jackets help keep your cable from collecting debris.
    • Dielectric strength of rubber tape increases as you add layers. For low-voltage applications (<600V), always apply a minimum of 2½ half-lapped layers.

Moisture Control

Self-bonding helps makes an air and watertight seal.

  • Rubber tapes repel moisture and are a great solution for outdoor applications or in manholes where water may occasionally seep in.

    In production plants and manufacturing facilities where steam, dripping water and elevated humidity are present, self-fusing rubber tapes provide much needed moisture protection.

    In a harsh environment, one that is subject to chemical and harsh fluid exposure; overwrap with a hearty vinyl tape to help prevent copper corrosion

High Temperature Performance

Engineered to beat the heat.

  • Anyone who’s left a roll of general purpose vinyl tape in the cab of their truck on a very hot summer day can attest to the fact that heat makes the adhesive soft. Extreme heat makes it ooze and flow.

    3M rubber tapes have operating temperatures ranging from 176°F (80°C) to 221°F (105°C). Some, like Scotch® Linerless Rubber Splicing Tape 130C and Rubber Splicing Tape 23, have overloads temperatures up to 266°F (130°C). Because of this high heat attribute; there are many industrial settings where it is common to use rubber tape in lower voltage applications to moisture seal, pad and insulate:

    • Production lines with blasting furnaces
    • Steel mills
    • Near heat vents
    • Machines and motors which run hot

    Wait, it gets hotter.

    3M also makes an electrical tape made of silicone rubber for applications where Class “H” (180°C/356°F) temperatures are encountered i.e., silicone rubber cables.

    • Scotch® Self-Fusing Silicone Rubber Electrical Tapes 70 and 70HDT offer very light weight, thin profiles for environmental sealing, insulation (typically 5 to 46kV), UV resistance and track and arc protection in very hot applications.
    • Scotch Tape 70HDT has a triangular profile, thicker in the middle. This tape is designed to create a uniform surface height when half-lapped.
    • These features can also be extremely important in applications such as naval, military and air craft manufacturing, where limiting weight and minimizing space are critical.

Extra Padding
  • Image from instructional video on building a conductor jacket using Scotch® Linerless Rubber Splicing Tape 130C and Scotch® Super 33+™ Vinyl Electrical Tape

    Thicker for Padding. Designed to take the shake.

    Engines and motors in a production line subject electrical connections to extreme vibrations. Rubber tapes are typically 4 times thicker than vinyl electrical tapes and provide extra mechanical protection for connections like motor leads that are subject to constant vibrations. They also provide excellent padding and conformability around surfaces with irregular, rough or sharp edges like bus bar and split bolt connections.

    Scotch® Linerless Rubber Splicing Tape 130C is 30 mils thick−watch it in action.

Types of Rubber, Insulating, and Splicing Tapes

  • An image illustrating wrapping of a low-voltage motor lead connection with Scotch® Self-Fusing Silicone Rubber Tape 70
    Primary Insulating Tapes 600V to 69kV

    Ethylene propylene rubber tapes for termination, splicing and bus bar applications. Premium tapes are recommended for medium to high voltage applications. They offer the highest performance ratings of tapes made by 3M, with excellent stretch. General purpose tapes are great for low voltage moisture sealing and padding.

    • Thickness: 30 mils
    • Operating Temperature: up to 194°F (90°)
    • Elongation: 700-1000%
    • Self-bonding
    • Linered or Linerless
    • Primary insulation up to 69kV

    Premium Tape

    Scotch® Linerless Rubber Splicing Tape 130C

    Scotch® Rubber Splicing Tape 23

    General Purpose

    Scotch® Linerless Rubber Tape 2242

    3M™ Temflex™ Rubber Splicing Tape 2155

  • An image illustrating wrapping of a motor lead cable with 3M™ Scotch® Linerless Rubber Splicing Tape 130C in an indoor utility plant
    Self-Fusing Silicone Rubber Tapes

    Self-fusing silicone rubber tape with a thin, profile and high operating temperature. Used in medium voltage applications and those with critical weight restrictions. Excellent ozone, arc and track resistance. Scotch® 70HDT Tape has a triangular profile, thicker in the middle, to even out half lapped wraps.

    • Thickness: 12-20 mil
    • Operating Temperature: up to 356°F (180°)
    • Elongation: 300-450%
    • Self-fusing
    • Lightweight
    • Primary insulation up to 69kV
    • Easy to tear liner

    Premium Tape

    Scotch® Self-Fusing Silicone Rubber Electrical Tape 70

    Scotch® Self-Fusing Silicone Rubber Electrical Tape 70HDT

  • An image illustrating wrapping cables outdoors with 3M™ Scotch® Cable Jacket Repair Tape 2234
    Cable Jacket Repair & Mining Tapes

    Extra tough backing made of vulcanized CSM rubber. Use to jacket cable in rough environments like construction sites, steel mills, petrochemical plants and industrial manufacturing. Use for on site repairs. Scotch® Heavy Duty Mining Tape 31 has an MSHA approval rating.

    • Thickness: 60 mils.
    • Operating Temperature: up to 221°F (105°)
    • Elongation: 500%
    • Oil and UV resistant
    • Flame Retardant
    • Self-healing, Abrasion resistant
    • Easy to tear liner

    Premium Tape

    Scotch® Heavy Duty Mining Tape 31

    Scotch® Cable Jacket Repair Tape 2234

  • An image illustrating wrapping of a connector on a Low-Voltage cable with Scotch® 2510 Varnish Cambric Tape
    Varnish Cambric Tapes

    The first electrical tape manufactured by 3M. Woven cotton cambric fabric stiffened with electrical insulating varnish. Creates a strong, insulating shell when wrapped around a cable, splice or bus bar.

    • Thickness: 7-8 mils
    • Operating Temperature: up to 220°F (105°)
    • Width: .75-2 inches
    • Oil primed
    • Excellent dielectric strength

    Premium Tape

    Scotch® Varnished Cambric Tape 2510

    Scotch® Varnished Cambric Tape 2520

Electrical Tapes and Grounding Products

In applications involving medium to high voltage current; electrical shielding and grounding products come into play. 3M offers a variety of solutions which are compatible with high voltage splicing and terminating materials.

  • An image of Scotch® Fire-Retardant Electric Arc Proofing Tape 77 Application
    Arc Protection

    Intumescent Elastomer Tape protects cable from arc flash faults if they should occur in adjacent cables within 20”. Elastomeric tape formulated to generate a thick charred buildup when exposed to high temperatures. Used as jacketing in high voltage applications including aerial and underground.

    • Thickness: 30 mils
    • Width: 1.5-3 inches
    • Elongation: 90-150%
    • One half-lap wrap provides adequate protection in most circumstances
    • Highly conformable

    Premium Tape

    Scotch® Fire-Retardant Electric Arc Proofing Tape 77

  • An image of Scotch® Electrical Shielding Tape 24 with box
    Electrical Shielding

    An all metal open weave tape. Creates a Faraday cage around the conductor to block the electromagnetic field in bifurcated cables.

    • Width: 1”-2”
    • Elongation: 70%
    • Operating Temperature: 32°F to 220°F (0°C to 105°C)
    • Fire resistant
    • Corrosion resistant
    • Permits complete resin saturation when splicing

    Premium Tape

    Scotch® Electrical Shielding 24

  • An image of Scotch® Electrical Semi-Conducting Tape 13 roll and box
    Electrical Semi-Conducting

    An ethylene propylene rubber tape. Provides continuous shielding inside multi-layered cables jackets. Because it conducts electricity; it should never be used as the outer jacket layer in a tape splice configuration. Must be overwrapped with non-conducting vinyl or rubber tape.

    • Thickness: 30 mils
    • Operating Temperature: up to 194°F (90°)
    • Elongation:800%
    • UV resistant
    • Moisture resistant
    • Suitable for providing bolted connections on insulated bus bars

    Premium Tape

    Scotch® Electrical Semi-Conducting Tape 13

  • An image of 3M™ Scotch® Grounding Braid 25T
    Electrical Grounding Braid

    An all metal woven grounding braid designed to extend the ground potential in medium to high voltage cables. It has a high current carrying capacity of 6 AWG wire. Use for aerial strand-mount, pad-mount, pole-mount underground and wall-mount applications

    • Highly conformable
    • Operating Temperature : 32°F to 220°F (0°C to 105°C)
    • Thickness: 93.75 mils
    • Width: 0.5”
    • Corrosion resistant copper

    Premium Tape

    Scotch® Grounding Braid 25T

Rubber + Mastic
  • Mastic is a very tacky material with extreme elongation properties. Rubber mastic tape combines an ethylene propylene rubber backing with a conformable mastic layer. Scotch® Rubber Mastic Tape 2228 integrates some of the best qualities of both materials−higher temperature rating, conformability, dielectric strength. It’s one tape that belongs in every toolkit.

    Long lasting applications + great for quick fixes.

    Learn more about Mastic Electrical Tape and where and when to use it.

  • Scotch® Premium Electrical Tapes

    The key to selecting the right electrical tape for your application.

    There are some basic rules to follow when you’re selecting electrical tape.

    • Vinyl backed tapes have a strong, flexible, abrasion resistant PVC backing which provide a barrier from moisture and corrosive elements. They are often the first and most economical choice for primary and secondary insulation.
    • Mastic tapes offer excellent adhesion and sealing characteristics to metals, rubbers, synthetic cable insulations and jackets. They provide UV resistance and are designed for outdoor conditions because they quickly and easily seal out moisture.
    • Rubber tapes are designed for use in splicing and terminating wires and cables with options rated up to 69kV. They have excellent physical and electrical properties and are ideal for adding moisture protection and padding to electrical connections and cables.

    Get more information on product selection, applications and training in our Electrical Resource Center.