Highly conformable electrically and thermally conductive lead foil tape with rubber adhesive for electroplating masking, radiation barriers, and industrial applications. 3 in x 36 yd roll, 6.8 mil thickness, operating range -60°F to 225°F.
3M™ Lead Foil Tape 420 is a highly conformable, electrically and thermally conductive tape designed for demanding industrial applications. This dark gray lead foil backed tape features a distinct green rubber adhesive that provides excellent initial grab and long-lasting bonds that remove cleanly from most surfaces. The tape measures 3 inches wide by 36 yards long with a 6.8 mil total thickness, making it ideal for masking applications in electroplating, radiation barriers, moisture barriers, and chemical milling operations.
The tape's exceptional conformability allows it to be shaped into complex patterns, detailed designs, or die-cut into specific shapes to meet precise assembly and manufacturing process requirements. The lead foil backing can be burnished to fully cover the adhesive and achieve direct metal-to-metal contact with the base surface, resulting in continued electrical conductivity and reduced build-up at the adhesive interface. This feature is particularly valuable in electroplating and radiation barrier applications where electrical continuity is critical.
Formulated with strong acid and base resistance, 3M Lead Foil Tape 420 resists flame, moisture, weather, UV degradation, and many chemicals commonly used in electroplating and anodizing processes. The rubber-based adhesive bonds exceptionally well to a variety of surfaces, including most metals, and performs reliably over a wide temperature range from -60°F to 225°F. The easy-release film liner enables precise die-cutting and handling during assembly processes, while the 18-month shelf life ensures product stability and performance consistency.
Key Features
- Electrically and thermally conductive lead foil backing for superior conductivity
- Highly conformable and pliable for complex shaping and die-cutting applications
- Rubber-based adhesive with excellent initial grab and long-lasting bonds
- Resists flame, moisture, weather, UV degradation, and industrial chemicals
- Wide operating temperature range from -60°F to -225°F with 18-month shelf life
- Easy-release film liner for precision assembly and manufacturing processes
- Strong acid and base resistance for electroplating and anodizing applications
- Bonds well to most metal surfaces with clean removal capability
Technical Specifications
| Specification |
Value |
| Product Number | 420 |
| UPC Code | 00638060571415 |
| Backing Material | Lead Foil |
| Adhesive Type | Rubber with green color |
| Width | 3 inches |
| Length | 36 yards |
| Total Tape Thickness | 6.8 mil (0.17 mm) |
| Backing Thickness | 5 mil (0.13 mm) |
| Adhesive Thickness | 2.1 mil |
| Tensile Strength | 20 lb/in (35 N/100mm) |
| Elongation at Break | 12% |
| Maximum Operating Temperature | 225°F (107°C) |
| Minimum Operating Temperature | -60°F (-51°C) |
| Shelf Life | 18 months |
| Unit Type | Roll |
| Specifications Met | ASTM D3652, ASTM D3759, ASTM D3833 |
| Brand | 3M™ |
| Color | Dark Silver/Dark Gray |
| Industries | Aerospace, Appliance, Automotive, Construction, Electronics, General Industrial, Metalworking, Military & Government, Specialty Vehicles, Transportation |
| Application Areas | Electroplating masking, radiation barrier, moisture barrier, chemical milling |
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