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Copper foil tape roll, 1 inch wide, 18 ft length, metallic copper finish

3M

3M 1125 Copper Shielding Foil Tape 18 ft

SKU CH-2GYY-QKXRF

Conductive copper foil tape provides EMI shielding up to 65 dB and operates from -40 to 265 °F with 600 V rating

  • ColorCopper
  • Conductive copper foil blocks EMI with 65 dB shielding
  • Acrylic adhesive bonds reliably from -40 °F to 265 °F
  • 5 mil thickness handles 600 V electrical insulation
  • Continuous 18 ft roll covers long seams without splices
  • Single-sided format simplifies application on ducts and cables

Purpose & Fit

3M 1125 Copper Shielding Foil Tape is a continuous roll of conductive foil designed for EMI and RFI shielding tasks. Its acrylic adhesive bonds to metal enclosures, cable wraps and component housings where grounding continuity matters. The 18 ft length suits field repairs and bench prototypes alike. Buyers needing insulation-only tape or non-conductive masking should choose a different product.

Thermal & Electrical Performance

The tape operates reliably from -40 Degrees F up to 265 Degrees F without adhesive breakdown. It carries a 600 V voltage rating and delivers 65 dB shielding effectiveness across the roll. At 3.5 mil thickness the copper layer resists tearing during handling while maintaining low surface resistance. No active cooling or derating is required in normal service.

Build Integration

Single-sided adhesive format allows direct application to chassis walls, connector backshells or cable braids without a liner to remove. The foil conforms to irregular contours and solders cleanly when a permanent joint is needed. It adds negligible bulk inside tight enclosures and requires no special tools beyond shears. Installers must ensure surface cleanliness for full conductivity.

Highlights

  • Conductive copper foil blocks EMI with 65 dB shielding
  • Acrylic adhesive bonds reliably from -40 °F to 265 °F
  • 5 mil thickness handles 600 V electrical insulation
  • Continuous 18 ft roll covers long seams without splices
  • Single-sided format simplifies application on ducts and cables

Specifications

Brand3M
ColorCopper

Questions about this item

How do I apply the 1-inch wide copper foil tape so the acrylic adhesive bonds properly?

Clean the surface thoroughly, then press the 3.5 mil tape firmly along its full 18 ft length to activate the single-sided acrylic adhesive; the step most often missed is skipping the surface cleaning, which prevents a reliable bond.

When will the 1125 tape need replacement in a high-temperature duct?

The tape is rated to 265 °F maximum; if the duct regularly exceeds that temperature the acrylic adhesive will degrade and the foil will need to be replaced.

At what point does the shielding drop below the rated 65 dB during continuous use?

Shielding effectiveness is specified at 65 dB up to the 600 V rating; sustained voltage above 600 V or temperatures beyond 265 °F will cause performance to fall below that level first.

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