Electrically and thermally conductive lead foil tape with exceptional conformability, flame and moisture resistance, and heat reflective properties for industrial masking, radiation barriers, and electroplating applications.
3M™ Lead Foil Tape 421 is a highly conformable, electrically and thermally conductive tape engineered for demanding industrial applications. This dark silver lead foil backed tape features a distinct green rubber adhesive that provides excellent initial grab and long-lasting bond performance while removing cleanly from most surfaces. 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 tape offers exceptional resistance to flame, moisture, weather, UV degradation, chemicals, and radiation, making it ideal for electroplating, radiation barrier applications, and x-ray plate masking. The lead foil backing can be burnished to fully cover the adhesive, enabling direct metal-to-metal contact that maintains electrical continuity and reduces impedance buildup at the adhesive interface. This 6.3 mil thick tape operates across a wide temperature range from -60°F to 225°F, ensuring reliable performance in diverse environmental conditions.
Designed for industrial and occupational use, this tape delivers superior performance in moisture barrier, chemical milling, and other specialized applications requiring both electrical conductivity and chemical resistance. Each roll measures 12 inches wide by 36 yards long, providing ample material for production runs and prototyping projects. The 18-month shelf life ensures product availability for planned manufacturing schedules.
Key Features
- Electrically and thermally conductive lead foil backing for superior electrical continuity
- Highly conformable and pliable construction allows shaping into complex patterns and die-cutting
- Resists flame, moisture, weather, UV degradation, chemicals, and radiation
- Heat and light reflective properties protect, insulate, and enhance lighting efficiency
- Rubber-based adhesive with green color provides excellent initial grab and clean removal
Technical Specifications
| Specification |
Value |
| Product Name | 3M™ Lead Foil Tape 421 |
| Part Number | 421 |
| UPC Code | 00051138953188 |
| 3M ID | 7010334288 |
| Backing Material | Lead Foil |
| Backing Thickness (Imperial) | 4 mil |
| Backing Thickness (Metric) | 0.1 mm |
| Adhesive Type | Rubber |
| Product Color | Dark Silver |
| Overall Width (Imperial) | 12 in |
| Overall Width (Metric) | 304.8 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 |
| 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 |
| Units per Case | 1 Roll |
| Smallest Saleable Unit | Roll |
| Brand | 3M™ |
| Industries | Aerospace, Appliance, Automotive, Construction, Electronics, General Industrial, Metalworking, Military & Government, Specialty Vehicles, Transportation |
| Recommended Applications | Electroplating masking, Radiation barrier, Moisture barrier, Chemical milling |
| Product Type | Foil Tape |
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