Premium electrically conductive lead foil tape with exceptional heat and flame resistance. Features conformable design, strong rubber adhesive, and superior chemical resistance for industrial masking, radiation barriers, and electroplating 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 bonds while removing cleanly from most surfaces. The malleable construction allows the tape to be shaped into complex or detailed patterns and die-cut into specific shapes to meet precise assembly and manufacturing process requirements.
The tape offers exceptional resistance to flame, moisture, weather, UV degradation, chemicals, and radiation, making it ideal for protective and masking applications across multiple industries. Its pliable nature enables formation into detailed and intricate shapes and patterns. The lead foil backing can be burnished to fully cover the adhesive and allow full contact of the lead foil to the metal base, resulting in metal-to-metal contact that ensures continuation of the electrical path while reducing build-up at the adhesive interface. With a total thickness of 6.3 mil and operating temperature range from -60°F to 225°F, this tape delivers reliable performance across diverse environmental conditions.
Specifically engineered for electroplating masking, radiation barriers, moisture barriers, and chemical milling applications, the 3M Lead Foil Tape 421 combines durability with conductivity. Each roll measures 6 inches wide by 36 yards long, providing ample coverage for industrial projects. The rubber-based adhesive combined with the rugged, durable lead foil backing provides extended service life, making this tape a cost-effective solution for demanding industrial environments requiring both electrical conductivity and chemical resistance.
Key Features
- Electrically and thermally conductive lead foil backing for superior conductivity
- Highly conformable and pliable tape that can be shaped into complex patterns and die-cut into specific shapes
- Resists flame, moisture, weather, UV degradation, chemicals, and radiation
- Distinctive green rubber adhesive with excellent initial grab and long-lasting bonds that removes cleanly
- Heat reflective properties that enhance lighting efficiency and provide thermal insulation
- Operates reliably across wide temperature range from -60°F to 225°F
- Lead foil backing can be burnished for full metal-to-metal contact and electrical continuity
- Ideal for electroplating masking, radiation barriers, moisture barriers, and chemical milling applications
- Durable construction provides extended service life in demanding industrial environments
- Available in convenient 6 inch width by 36 yard length roll format
Technical Specifications
| Specification |
Value |
| Product Name | 3M™ Lead Foil Tape 421 |
| Part Number | 421 |
| UPC Code | 00051138958916 |
| 3M Product Number | 421 |
| 3M ID | 7010373552 |
| Product Color | Dark Silver |
| Backing Material | Lead Foil |
| Adhesive Type | Rubber |
| Adhesive Color | Green |
| Overall Width (Imperial) | 6 in |
| Overall Width (Metric) | 152.4 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% |
| 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 |
| Smallest Saleable Unit | Roll |
| Units per Case | 2.0 |
| Brand | 3M™ |
| Product Type | Foil Tape |
| Tape Category | Lead Tapes |
| Conductivity | Electrically and Thermally Conductive |
| Chemical Resistance | Strong Acid and Base Resistance |
| Flame Resistance | Yes |
| Moisture Resistance | Yes |
| UV Resistance | Yes |
| Radiation Resistance | Yes |
| Weather Resistance | Yes |
| Application Use | Industrial/Occupational Use Only |
| 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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