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Black vinyl mastic tape strips, 40 pieces, 125 mil thick

3M

3M 2229-P Scotch-Seal Mastic Tape 125 mil 2-1/2 x 3-3/4 in PK40 electrician tool

SKU CH-SNZ2-MEV4E

Self-fusing mastic strips seal and insulate splices up to 1000 volts and 175 °F, supplied in a 40-piece pack

  • 125 mil mastic thickness seals out moisture
  • Rated to 175 °F for high-temperature environments
  • UV-resistant vinyl backing withstands outdoor exposure
  • Meets ASTM D1000 and D150 standards
  • Pack of 40 strips covers multiple jobs

Electrical insulation tape

3M Scotch-Seal 2229 mastic tape is a vinyl-backed strip with a mastic adhesive designed for sealing and insulating electrical connections up to 1,000 volts. The black strips measure 2-1/2 inches wide by 3-3/4 inches long and come in a pack of 40 for professional electrician use.

Build and daily handling

Each strip is 125 mil thick, giving a substantial self-fusing layer that conforms to irregular shapes and resists UV exposure for outdoor durability. The vinyl backing protects the mastic core during handling, while the strip format allows quick, tool-free application on splices, terminals and cable jackets.

Voltage and temperature limits

The tape is rated for a maximum of 1,000 volts and a continuous operating temperature of 175 degrees F, with compliance to ASTM D1000 and D150 test standards. These ratings define the safe envelope for high-voltage sealing and thermal stress; applications beyond these limits require a different insulation system.

How it compares

Measured against everything we stock in Electrical Trade Tools & Kits, at today’s prices. Recalculated every night.

Price $154.99
Pricier than about 70% of the 5,006 comparable items (median $95.99).

Specifications

Product
Brand name3M

Questions about this item

What does the 1000-volt rating mean for the Scotch-Seal 2229 mastic tape?

The tape is rated for a maximum of 1000 volts, so it is suitable for insulating and sealing low-voltage electrical connections up to that limit.

What are the exact dimensions of each strip in the pack?

Each strip measures 2-1/2 inches wide by 3-3/4 inches long with a thickness of 125.0 mil, supplied as individual pieces in a pack of 40.

How do you apply the mastic tape correctly, and what is the common mistake?

Remove the liner, stretch the tape slightly, and wrap it with half-lap coverage so the mastic fuses into a void-free seal; the frequent error is failing to stretch it enough, which leaves gaps.

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