Premium electrically and thermally conductive lead foil tape with rubber adhesive, resistant to flame, moisture, UV, and chemicals. Ideal for electroplating masking, radiation barriers, and industrial assembly applications.
3M™ Lead Foil Tape 421 is a premium electrically and thermally conductive tape designed for demanding industrial applications. This highly conformable tape features a dark gray lead foil backing coated with a distinctive green rubber adhesive that provides excellent initial grab and long-lasting bonding capability. The tape resists flame, moisture, weather, UV degradation, chemicals, and radiation, making it ideal for complex manufacturing and assembly processes. The malleable composition allows the tape to be shaped into intricate patterns or die-cut into specific shapes to meet precise application requirements.
The tape's exceptional conformability enables it to form detailed and complex patterns while maintaining superior adhesion. The lead foil backing can be burnished to fully cover the adhesive, allowing direct metal-to-metal contact with the substrate. This metal-to-metal connection ensures continuity of the electrical path while reducing adhesive interface buildup. With a rubber-based adhesive combined with a rugged, durable backing, this tape provides extended service life even in harsh environments. The product performs reliably across a wide temperature range from -60°F to 225°F (-51°C to 107°C), offering heat and light reflective properties that enhance thermal efficiency and protection.
This industrial-grade tape is specifically formulated for electroplating masking applications, radiation barrier installation, moisture protection, and chemical milling processes. Each case contains 6 rolls, with each roll measuring 2 inches wide by 36 yards long and 6.3 mils thick. The tape's strong acid and base resistance, combined with its thermal conductivity, makes it an essential solution for aerospace, automotive, electronics, and metalworking industries. For industrial and occupational use only, this tape is not intended for consumer applications.
Key Features
- Electrically and thermally conductive lead foil backing for superior electrical continuity
- Highly conformable and pliable design allows shaping into complex patterns and die-cutting
- Rubber-based adhesive with excellent initial grab and long-lasting clean removal
- Exceptional resistance to flame, moisture, weather, UV degradation, chemicals, and radiation
- Wide temperature performance range from -60°F to 225°F with heat and light reflective properties
- Metal-to-metal contact capability through burnishable lead foil backing
- Strong acid and base resistance ideal for electroplating applications
- Durable backing provides extended service life in harsh industrial environments
Technical Specifications
| Specification |
Value |
| Product Name | 3M™ Lead Foil Tape 421 |
| Part Number | 421 |
| 3M Product Number | 421 |
| 3M ID | 7000049080 |
| UPC | 00051138953096 |
| Backing Material | Lead Foil |
| Adhesive Type | Rubber |
| Product Color | Dark Silver |
| Overall Width (Imperial) | 2 in |
| Overall Width (Metric) | 50.8 mm |
| Overall Length (Imperial) | 36 yd |
| Overall Length (Metric) | 32.91 m |
| 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 ℉ |
| Minimum Operating Temperature (Celsius) | -51 ℃ |
| Maximum Operating Temperature (Fahrenheit) | 225 ℉ |
| Maximum Operating Temperature (Celsius) | 107 ℃ |
| Shelf Life | 18 Month |
| Units per Case | 6 Rolls |
| Smallest Saleable Unit | Roll |
| Brand | 3M™ |
| Recommended Applications | Electroplating masking, Radiation barrier, Moisture barrier, Chemical milling |
| Industries | Aerospace, Appliance, Automotive, Construction, Electronics, General Industrial, Metalworking, Military & Government, Specialty Vehicles, Transportation |
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