Electrically conductive lead foil tape with heat reflective properties, resists flame, moisture, UV, and chemicals. Ideal for electroplating, radiation barriers, and industrial masking applications.
3M™ Lead Foil Tape 421 is a premium electrically and thermally conductive tape designed for demanding industrial applications. This highly conformable dark gray lead foil backed tape features a distinctive green rubber adhesive that provides excellent initial grab and long-lasting bond while removing cleanly from most surfaces. 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 requirements. The lead foil backing can be burnished to fully cover the adhesive and establish metal-to-metal contact with the base substrate, ensuring electrical path continuity and reducing build-up at the adhesive interface. With a rubber-based adhesive combined with rugged, durable backing, this tape provides exceptional service life across a wide variety of temperature conditions from -60°F to 225°F (-51°C to 107°C).
This industrial-grade tape is specifically formulated for electroplating masking, radiation barriers, moisture protection, and chemical milling applications. The 1/4 inch width, 36-yard length, and 6.3 mil total thickness provide versatility for various application requirements. Each case contains 36 rolls, offering excellent value for high-volume industrial operations. Not for consumer sale or use.
Key Features
- Electrically and thermally conductive for superior performance
- Highly conformable and pliable for complex shapes and patterns
- Resists flame, moisture, weather, UV degradation, and chemicals
- Heat and light reflective properties for enhanced efficiency
- Rubber adhesive provides excellent initial grab and long-lasting bond
- Can be die-cut into specific shapes for assembly processes
- Metal-to-metal contact capability when burnished
- Wide temperature range from -60°F to 225°F
- Removes cleanly from most surfaces
- Industrial-grade durability for demanding applications
Technical Specifications
| Specification |
Value |
| Product Name | 3M™ Lead Foil Tape 421 |
| Part Number | 421 |
| 3M Product Number | 421 |
| 3M ID | 7100103502 |
| UPC | 00051138953065 |
| Color | Dark Silver |
| Backing Material | Lead Foil |
| Adhesive Type | Rubber (Green) |
| Overall Width (Imperial) | 0.25 inches |
| Overall Width (Metric) | 6.35 millimeters |
| Overall Length (Imperial) | 36 yards |
| Overall Length (Metric) | 32.91 meters |
| Total Tape Thickness (Imperial) | 6.3 mils |
| Total Tape Thickness (Metric) | 0.16 millimeters |
| Backing Thickness (Imperial) | 4 mils |
| Backing Thickness (Metric) | 0.1 millimeters |
| Adhesive Thickness (Metric) | 0.1 millimeters |
| Tensile Strength (Imperial) | 15 lb/in |
| Tensile Strength (Metric) | 26.3 N/100mm |
| Elongation at Break | 14% |
| Maximum Operating Temperature (Fahrenheit) | 225°F |
| Maximum Operating Temperature (Celsius) | 107°C |
| Minimum Operating Temperature (Fahrenheit) | -60°F |
| Minimum Operating Temperature (Celsius) | -51°C |
| Shelf Life | 18 months |
| Units per Case | 36 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 |
| Chemical Resistance | Strong acid and base resistance |
| Environmental Resistance | Flame, moisture, weather, UV degradation, chemicals, and radiation resistant |
Order 3M Lead Foil Tape 421 Dark Silver 1/4 inch at wholesale prices for companies and factories in Iraq and Middle East, get the best deals on bulk purchases, contact us today.
