3M 425 Aluminum Foil Tape for HVAC Sealing Heat Shielding and Conduction

The 3M 425 aluminum foil tape consists of a high purity aluminum foil backing and thermally conductive acrylic adhesive. With over 93% reflectivity, it provides exceptional heat reflection for HVAC systems and heat pipelines. This UL-listed foil tape effectively seals and insulates ductwork while creating a moisture and vapor barrier. It conforms well to seal seams, connections and fittings in air conditioning and ventilation ducts. Resistant to UV and temperature extremes, the 3M 425 withstands harsh indoor and outdoor conditions. Easy tear and quick stick application enables reliable HVAC sealing to improve energy efficiency.

Table of Contents


  • Aluminum foil backing provides excellent reflectivity.
  • Acrylic adhesive with high thermal conductivity.
  • Conforms well to seal curved and irregular surfaces.
  • Creates an effective moisture and vapor barrier.
  • Withstands high and low temperatures.
  • Resists UV radiation and oxidation.
  • Easy to tear and apply.
  • UL listed for flame retardance.


Adhesive Type Acrylic
Application Wiring Harness Attachment, Painting, Stripping
Back Side Adhesive Thickness (Imperial) 1.8 mil
Back Side Adhesive Thickness (Metric) 0.05 mm
Backing (Carrier) Material Aluminum Foil
Backing (Carrier) Thickness (Imperial) 2.8 mil
Backing (Carrier) Thickness (Metric) 0.07 mm
Backing Material Aluminum Foil
Brands 3M™ Aluminum Foil Tape 425
Elongation at Break 6.00%
Industries Aerospace, Electronics, General Industrial, Automotive, Appliance, Construction, Military & Government, Specialty Vehicle, Metalworking, Transportation
Maximum Operating Temperature (Celsius) 149 ℃
Maximum Operating Temperature (Fahrenheit) 300 ℉
Minimum Operating Temperature (Celsius) -54 ℃
Minimum Operating Temperature (Fahrenheit) -65 ℉
Primary Liner Easy Release Film
Product Color Silver
Rolls per Case 12
Shelf Life 24 Month
Specifications Met FAR 25.853(a), L-T-80C, SAE-AMS-T-23397
Tensile Strength (Imperial) 28.0 lb/in
Tensile Strength (Metric) 49 N/100mm, 490 N/100mm
Total Tape Thickness without Liner (Imperial) 4.6 mil
Total Tape Thickness without Liner (Metric) 0.12 mm
Units per Case 24


3M 425 aluminum foil tape is most commonly used for sealing, insulating and repairing ductwork, piping and other components in heating, ventilation and air conditioning systems, where it creates a reflective surface to conserve energy loss as well as an effective moisture barrier; it can seal connections, gaps and joints in sheet metal or flexible air ducts, as well as insulate hot water and steam pipes to prevent heat dissipation and protect against condensation buildup; additionally, its high reflectivity makes 3M 425 foil tape suitable as a radiant heat barrier when applied to walls, roofs and around heating equipment to improve energy efficiency.


Applicable Industries:

  • Sealing HVAC ductwork and air conditioning systems.
  • Creating insulation for heating pipes and hot equipment.
  • Patching and repairing insulation jackets.
  • Moisture proofing walls, ducts and roofing materials.
  • Retrofitting ducts, coils, pipes in HVAC systems.
  • Boosting energy efficiency through heat reflection.3m 425 aluminum foil tape application-1

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