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Copper foil tape roll, 3/4 inch wide, 18 ft length, acrylic adhesive

3M

3M 1125 Copper Foil Tape 3/4 In 18 Ft HVAC Control

SKU CH-FNZJ-X79E0

Conductive copper foil tape with acrylic adhesive, 18 ft roll, rated 600 V and 65 dB shielding from -40 to 265 °F

  • ColorCopper
  • Conducts electricity reliably with 600 V rating
  • Shields signals effectively at 65 dB effectiveness
  • Performs in extreme cold down to -40 °F
  • Withstands high heat up to 265 °F
  • Thin 3.5 mil profile fits tight spaces

3M 1125 Copper Foil Tape — HVAC & Electrical

This 3M 1125 copper foil tape serves HVAC technicians and electricians who need a conductive, heat-resistant wrap for ductwork, cable shielding or grounding tasks. The single-sided acrylic adhesive bonds to metal and insulation at temperatures from -40 °F to 265 °F. Supplied as an 18 ft continuous roll, it is ready for immediate use on site.

Practical limits of the 600 V.

The tape carries a 600 V voltage rating and delivers 65 dB shielding effectiveness, making it suitable for low-voltage control circuits and EMI reduction on signal cables. It is not rated for high-voltage power distribution or applications that demand shielding performance beyond the stated 65 dB figure. The 3.5 mil thickness provides mechanical durability but does not replace dedicated conduit or armoured cable where codes require it.

Check surface prep and temperature range before

Verify that the mounting surface is clean, dry and free of oil so the acrylic adhesive achieves full bond strength. Confirm that the operating environment stays within the -40 °F to 265 °F performance window; sustained exposure outside this range can degrade adhesion and conductivity. Ensure the 3/4 in width and 18 ft length match the intended wrap or shielding job.

Highlights

  • Conducts electricity reliably with 600 V rating
  • Shields signals effectively at 65 dB effectiveness
  • Performs in extreme cold down to -40 °F
  • Withstands high heat up to 265 °F
  • Thin 3.5 mil profile fits tight spaces

Specifications

Brand3M
ColorCopper

Questions about this item

Should I pick the 3/4 in by 18 ft roll or look for a wider copper foil tape?

The 3/4 in width suits narrow seams and cable wraps; a wider roll covers large ducts faster but adds bulk and cost.

What does the 65 dB shielding figure mean once the tape is applied inside a real HVAC cabinet?

It indicates the copper foil attenuates electromagnetic interference by 65 dB across the tested frequency range when wrapped with proper overlap.

How does the acrylic adhesive and 3.5 mil thickness limit the 600 V rating in practice?

The single-sided acrylic bond holds to 265 °F and stays flexible to -40 °F, so the 600 V insulation rating is valid only within that temperature window.

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