Electrically conductive lead foil tape with rubber adhesive for electroplating, radiation shielding, and industrial masking applications. Flame and UV resistant with wide temperature performance range.
3M™ Lead Foil Tape 420 is a premium electrically and thermally conductive tape engineered for demanding industrial applications. This highly conformable dark silver tape combines a lead foil backing with a specialized green rubber adhesive, delivering exceptional performance in electroplating, radiation shielding, and chemical barrier applications. The tape resists flame, moisture, weather, UV degradation, and many chemicals used in electroplating and anodizing processes, making it ideal for harsh industrial environments.
The rubber-based adhesive bonds exceptionally well to a variety of surfaces, including most metals, providing reliable adhesion across a wide temperature range from -60°F to 225°F (-51°C to 107°C). With a total thickness of 6.8 mils and a 5 mil lead foil backing, this tape offers superior electrical conductivity and thermal performance. The malleable construction allows the tape to be shaped into complex patterns or die-cut into specific shapes for precision assembly and manufacturing processes, while the easy-release film liner facilitates clean removal and repositioning.
Each roll measures 6 inches wide by 36 yards long, providing ample coverage for industrial masking, radiation barriers, moisture protection, and chemical milling applications. The tape's ability to be burnished for full lead foil contact with metal bases ensures excellent electrical path continuation and minimal build-up at the adhesive interface. Meeting ASTM D3652, ASTM D3759, and ASTM D3833 specifications, this product is specifically formulated for industrial and occupational use with an 18-month shelf life.
Key Features
- Electrically and thermally conductive lead foil backing for superior electrical path continuity
- Highly conformable and pliable design allows shaping into complex patterns and die-cutting for assembly applications
- Rubber-based adhesive with excellent initial grab and long-lasting bond that removes cleanly from most surfaces
- Resists flame, moisture, weather, UV degradation, and many chemicals used in electroplating and anodizing processes
- Wide operating temperature range from -60°F to 225°F with strong acid and base chemical resistance
Technical Specifications
| Specification |
Value |
| Product Type | Lead Foil Tape |
| Brand | 3M™ |
| Part Number | 420 |
| UPC Code | 00051138956714 |
| Color | Dark Silver |
| Overall Width | 6 inches (152.4 mm) |
| Overall Length | 36 yards (32.91 meters) |
| Total Tape Thickness | 6.8 mils (0.17 mm) |
| Backing Material | Lead Foil |
| Backing Thickness | 5 mils (0.13 mm) |
| Adhesive Type | Rubber |
| Adhesive Thickness | 2.1 mils |
| Tensile Strength | 20 lb/in (35 N/100mm) |
| Elongation at Break | 12% |
| Minimum Operating Temperature | -60°F (-51°C) |
| Maximum Operating Temperature | 225°F (107°C) |
| Shelf Life | 18 months |
| Units per Case | 1 roll |
| Smallest Saleable Unit | Roll |
| Specifications Met | ASTM D3652, ASTM D3759, ASTM D3833 |
| Applicable Industries | Aerospace, Appliance, Automotive, Construction, Electronics, General Industrial, Metalworking, Military & Government, Specialty Vehicles, Transportation |
| Liner Type | Easy-release film liner |
| Chemical Resistance | Strong acid and base resistance |
| Flame Resistance | Flame resistant |
| UV Resistance | UV degradation resistant |
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