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3M™ Lead Foil Tape 421 Dark Silver, 6 in x 36 yd 6.3 mil, 2 per case Bulk

3M ID  70006392651    UPC#  00051138958916    Part Number  421    3M Product Number  421     
3M(TM) Lead Foil Tape 421
3M(TM) Lead Foil Tape 421
3M™ Lead Foil Tape 421 Dark Silver, 6.3 mil (0.16 mm) lead foil backing with a green rubber adhesive.
  • Dark silver, lead foil 4.0 mil backing, rubber adhesive, temperature range -60F to 225F
  • Good conformability, electrically and thermally conductive, strong acid and base resistance, electroplating, radiation barrier, x-ray plate masking, weighting and balancing, die-cuttable
  • Resists flame, resists moisture, resists weather, resists UV degradation, chemical resistant tape, thermally conductive tape for heating and cooling efficiency, heat reflective tape, light reflective tape, conformable tape
  • Automotive, Aerospace, HVAC, Appliance, Military, Government, Defense, Marine, Metal Finishing, Electronics, Recreational Vehicle, Construction, General Industrial
  • Masking, sealing, seaming, shielding, chemical stripping, harness wrapping, joining, vibration damping, electroplating, plastic protection, chemical milling, heat shielding, heat reflecting, paint stripping
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3M™ Lead Foil Tape 421, used as a maskant in electroplating and as a moisture and radiation barrier in certain applications. Lead foil backing provides good conformability having electrically and thermally conductive properties.


Adhesion to Steel oz/in (N/100 mm)31 (34)
Adhesive TypeRubber
Backing MaterialLead foil
Backing Thickness4 mil
Backing Thickness (metric)0.1 mm
ColorDark Silver
Elongation14 Percent
IndustriesGeneral Industrial, Construction, Automotive, Aerospace, Electronics, Specialty Vehicle, Metalworking, Transportation, Appliance, Military & Government
Length36 Linear Yard
Length (Metric)32.91 m
Liner TypeEasy Release Film
Maximum Operating Temperature (Celsius)107 Degree Celsius
Maximum Operating Temperature (Fahrenheit)225 Degree Fahrenheit
Operating Temperature Range (Celsius)-51 to 107 Degree Celsius
Operating Temperature Range (Fahrenheit)-60 to 225 Degree Fahrenheit
Product FormRoll
Shelf Life in Months (from date of manufacture)18
Tensile Strength15 lb/in
Tensile Strength (metric)263 N/100mm
Total Thickness6.3 mil
Width6 Inch
Width (Metric)152.4 mm