Electrically and thermally conductive lead foil tape with rubber adhesive, resistant to flame, moisture, UV, and chemicals. Ideal for electroplating, radiation barriers, and industrial masking applications.
3M™ Lead Foil Tape 421 is an electrically and thermally conductive tape engineered for demanding industrial applications. This highly conformable dark silver tape features a lead foil backing with a specialized green rubber adhesive that delivers excellent initial grab and long-lasting bonds. The tape resists flame, moisture, weather, UV degradation, chemicals, and radiation, making it ideal for aerospace, automotive, electronics, and metalworking industries.
The malleable construction allows the tape to be shaped into complex patterns 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, enabling metal-to-metal contact that continues the electrical path and reduces build-up at the adhesive interface. This unique capability makes it exceptionally valuable for electroplating masking, radiation barriers, and x-ray plate masking applications.
With a rubber-based adhesive combined with rugged, durable backing, this tape provides extended service life across wide temperature ranges from -60°F to 225°F. Each case contains 18 rolls, with each roll measuring 1/2 inch wide by 36 yards long and 6.3 mils thick. The tape removes cleanly from most surfaces while maintaining strong acid and base resistance, making it the preferred choice for critical industrial and occupational applications.
Key Features
- Electrically and thermally conductive lead foil backing for superior performance
- Highly conformable and pliable construction allows shaping into complex patterns and die-cutting
- Resists flame, moisture, weather, UV degradation, chemicals, and radiation exposure
- Heat and light reflective properties protect, insulate, and enhance lighting efficiency
- Green rubber adhesive provides excellent initial grab with long-lasting clean removal from surfaces
- Operates reliably across wide temperature range from -60°F to 225°F
- Metal-to-metal contact capability when burnished reduces electrical path build-up
- Strong acid and base resistance ideal for electroplating applications
- 18-month shelf life ensures product stability and reliability
- Industrial-grade formulation for demanding occupational and manufacturing processes
Technical Specifications
| Specification |
Value |
| Product Name | 3M™ Lead Foil Tape 421 |
| Part Number | 421 |
| 3M Product Number | 421 |
| 3M ID | 7000049078 |
| UPC | 00051138953058 |
| Color | Dark Silver |
| Backing Material | Lead Foil |
| Adhesive Type | Rubber (Green) |
| Overall Width (Imperial) | 0.5 inch |
| Overall Width (Metric) | 12.7 mm |
| Overall Length (Imperial) | 36 yards |
| Overall Length (Metric) | 32.91 meters |
| Total Tape Thickness (Imperial) | 6.3 mil |
| Total Tape Thickness (Metric) | 0.16 mm |
| Backing Thickness (Imperial) | 4 mil |
| Backing Thickness (Metric) | 0.1 mm |
| Adhesive Thickness (Metric) | 0.1 mm |
| Tensile Strength (Imperial) | 15 lb/in |
| Tensile Strength (Metric) | 26.3 N/100mm |
| Elongation at Break | 14% |
| Minimum Operating Temperature (Fahrenheit) | -60°F |
| Minimum Operating Temperature (Celsius) | -51°C |
| Maximum Operating Temperature (Fahrenheit) | 225°F |
| Maximum Operating Temperature (Celsius) | 107°C |
| Shelf Life | 18 months |
| Units per Case | 18 rolls |
| Smallest Saleable Unit | Roll |
| Brand | 3M™ |
| Applicable Industries | Aerospace, Appliance, Automotive, Construction, Electronics, General Industrial, Metalworking, Military & Government, Specialty Vehicles, Transportation |
| Recommended Applications | Electroplating masking, Radiation barrier, Moisture barrier, Chemical milling |
| Chemical Resistance | Strong acid and base resistance |
| Flame Resistance | Flame resistant |
| UV Resistance | UV degradation resistant |
| Moisture Resistance | Moisture resistant |
| Radiation Resistance | Radiation resistant |
| Electrical Properties | Electrically conductive |
| Thermal Properties | Thermally conductive and heat reflective |
| Use Classification | Industrial/Occupational use only - Not for consumer sale |
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