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3M™ Lead Foil Tape 421 – Lead foil tape – electroplating, radiation barrier, x-ray masking, weighting, aerospace, automotive

  • Item Name: 3M™ Lead Foil Tape 421

  • Manufacturer: 3M

  • Technologies: Rubber-based adhesive with conformable lead foil backing

  • Color: Dark Silver

  • Cure Type: Pressure sensitive (self-adhesive, no curing required)

  • Package Size: 1 in x 36 yd (25.4 mm x 32.91 m), 9 rolls/case

  • Shelf Life: 18 months

1. Product Overview
3M™ Lead Foil Tape 421 is a dark silver, 6.3 mil (0.16 mm) conformable tape made with a lead foil backing and coated with a green rubber-based adhesive. It provides electrical and thermal conductivity, excellent chemical and radiation resistance, and long-term durability under harsh conditions. The tape is highly pliable, allowing it to conform to complex shapes or be die-cut for specialized applications. Resistant to flame, weather, moisture, UV, acids, and bases, it offers a reliable solution for demanding industrial, aerospace, and electronic uses.

2. Applications

  • Electroplating masking and chemical milling.

  • X-ray plate masking and radiation barrier.

  • Moisture and weather sealing (including thermo pane windows).

  • Weighting and balancing equipment, golf clubs, and sports gear.

  • Heat/light reflection for thermal management.

  • General aerospace, automotive, and electronics assembly.

3. Typical Properties

Property Value / Description
Adhesive Type Rubber (green)
Backing Material Lead Foil
Total Thickness 0.16 mm (6.3 mil)
Back-Side Adhesive Thickness 0.1 mm
Backing Thickness 0.1 mm
Operating Temperature Range -51 °C to 107 °C
Elongation at Break 14%
Tensile Strength 263 N/100 mm
Shelf Life 18 months
Dimensions 25.4 mm width × 32.91 m length
Units per Case 9 rolls

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