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Silver 3M 438 foil tape roll, 4 in wide by 5 yd long

3M

3M 438 Foil Tape Aluminum Silver 4 in x 5 yd

SKU CH-5DJ1-BJ1Z8

Aluminum foil tape rated from -65 to 300 degrees Fahrenheit for indoor or outdoor sealing

  • ColorSilver
  • Withstands extreme heat up to 300 °F
  • Remains flexible in severe cold down to -65 °F
  • Suitable for indoor and outdoor environments
  • Trusted 3M brand for professional assembly and repair
  • Continuous roll format simplifies application across trades

3M 438 Aluminum Foil Tape

This 3M 438 foil tape is an aluminum adhesive roll built for indoor and outdoor sealing tasks. It serves automotive, aviation, construction, electronics and general maintenance crews who need a reliable metal-backed tape. The silver finish reflects heat and resists moisture across a wide service envelope.

Temperature range and headroom

The tape performs continuously from minus 65 degrees F up to 300 degrees F, giving ample headroom for high-heat duct joints and freezing-condition repairs. It runs out of margin above 300 degrees F or below minus 65 degrees F, so extreme furnace flanges or cryogenic lines need a different product.

Build integration

The continuous roll measures 4 in by 5 yd and conforms to irregular surfaces without a liner, freeing installers from cutting individual patches. It needs a clean, dry substrate and firm pressure to achieve full bond, and it eliminates the need for separate mastics or mechanical fasteners on compatible metal ducts.

Highlights

  • Withstands extreme heat up to 300 °F
  • Remains flexible in severe cold down to -65 °F
  • Suitable for indoor and outdoor environments
  • Trusted 3M brand for professional assembly and repair
  • Continuous roll format simplifies application across trades

Specifications

Brand3M
ColorSilver

Questions about this item

Will the 3M 438 foil tape stay bonded on the older sheet-metal ducts I'm keeping when the system cycles down to -65 Degrees F?

Yes, the tape is rated for continuous performance from -65 Degrees F to 300 Degrees F, so it remains adhered through extreme cold and heat cycles on existing ductwork.

How can I verify the 3M 438 tape is sealing properly once I've applied it to the joints?

Press the tape firmly with a squeegee or roller to activate the pressure-sensitive adhesive, then visually inspect for wrinkles or gaps and run a smoke pencil or light leak test along each seam.

Does the roll include a liner or dispenser, or do I need to buy a separate applicator for the 4 in x 5 yd size?

The product ships as a continuous roll of foil tape only; no liner, dispenser or applicator is included, so you will need to supply your own cutting and application tools.

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