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3M 421

3M 421

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

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。

  • Brand: 3M
  • Model No.: 421
  • Backing: Lead Foil
  • Adhesive: Rubber
  • Color: Dark silver
  • Backing thickness: 0.1mm
  • Total thickness: 0.17mm
  • Cutting: Any width
  • Die-cutting is available
Data Sheet
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3M 421 Data Sheet

BackingLead Foil
Adhesive TypeRubber (green)
ColorDark Silver
Backing Thickness0.1 mm (4 mil)
Test Method: ASTM D3652
Total Tape Thickness6.6 mil (0.17 mm)
Test Method: ASTM D3652
Total Tape Thickness0.17 mm
Test Method: ASTM D3652
Backing Thickness4 mil
Test Method: ASTM D3652
Approximate Weight28.4 g/m/24 mm (0.061 lb/yd/in)
Approximate Weight0.061 lb/yd/in
Water Vapor Transmission1.55 g/m²/24 hr (0.1 g/100 in²/24 hr)
Test Method: ASTM D3833
Water Vapor Transmission0.1 g/100 in²/24 hr
Test Method: ASTM D3833
Typical Performance Characteristics
Tensile Strength26.3 N/cm (15 lb/in)
Test Method: ASTM D3759
180° Peel Adhesion4.9 N/cm (45 oz/in)
Test Method: ASTM D3330 Notes: 12 in/min (300 mm/min)
180° Peel Adhesion45 oz/in
Test Method: ASTM D3330
Notes: 12 in/min (300 mm/min)
Tensile Strength15 lb/in
Test Method: ASTM D3759
Elongation at Break0.14
Test Method: ASTM D3759
Long Term Temperature Resistance107 °C (225 °F)
Minimum Long Term Temperature Resistance-51 °C (-60 °F)
Long Term Temperature Resistance225 °F
Minimum Long Term Temperature Resistance
Available Sizes
-60 °F
Standard Roll Length33 m (36 yd)
Standard Roll Length36 yd

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.
  • Elevated lead levels in water may result from long-term submersion of this product.
  • This material when disposed of separately is classified as RCRA hazardous waste. Please consult applicable Federal, State, and local regulations for proper disposal.
  • 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
  • Cutting or slitting to the length and width required by the customers
  • Laminate liner or other materials
  • Die cut according to customer's drawing

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