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3M 421

3M 421 Is an electrically and thermally conductive tape. This highly conformable tape resists flame, moisture, weather, UV degradation, chemicals, and radiation. The malleable tape can be shaped into complex or detailed patterns or die-cut into specific shapes to meet assembly and manufacturing process needs.

  • Color: Dark Silver
  • Thickness: 6.3 mil | 0.16 mm
  • Backing: Lead Foil
  • Adhesive: Rubber
  • Industries:Construction, Electronics, Metalworking, Specialty Vehicle, Aerospace, Automotive, General Industrial, Military & Government, Transportation, Appliance

3M 421 is backed with a rubber adhesive, offering excellent conformability in a variety of application conditions.

  • Conformable tape resists flame, moisture, weather, UV degradation, and many chemicals
  • Performs over a wide variety of temperature conditions and is heat reflective
  • Heat and light reflective tape protects, insulates, and enhances lighting efficiency
  • Can be die-cut into specific shapes for assembly and manufacturing processes
  • The rubber-based adhesive combined with the rugged, durable backing provides long service life
3M 421
3M 421
3M 421
3M 421

3M 421 Features

  • Very good conformability.
  • Good thermal properties and will perform over a wide variety of temperature conditions (-60° to 225°F or -54° to 106°C). It has been used at higher temperatures for a shorter duration.
  • Electrically and thermally conductive.
  • Can be die-cut into specific shapes.
  • This material when disposed of separately is classified as RCRA hazardous waste. Please consult applicable Federal, State, and local regulations for proper disposal.
  • Elevated lead levels in water may result from long-term submersion of this product.
  • The best results are obtained when applied to a clean dry surface above 32°F (0°C). Also, by “feathering” the edges – rubbing the tape down with a smooth-edged plastic piece (or similar object) – the tape can be made to better conform to the substrate. This is especially important if the tape is to be used as a “thief” in electroplating where the edges must fully contact the metal base.

3M 421 Applications

  • Electroplating
  • Radiation barrier
  • Moisture barrier
  • Chemical milling
  • X-ray plate masking

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