Electrically and thermally conductive lead foil tape with rubber adhesive, flame and moisture resistant, ideal for electroplating, radiation barriers, and industrial masking applications in aerospace and automotive industries.
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 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 nature of this lead foil tape allows it to be shaped into complex or detailed patterns and die-cut into specific shapes to meet assembly and manufacturing process requirements. The lead foil backing can be burnished to fully cover the adhesive and enable full contact of the lead foil to the metal base, resulting in continued electrical path and reduced build-up at the adhesive interface. This exceptional conformability combined with superior conductivity makes it perfect for precision applications requiring metal-to-metal contact.
With a maximum operating temperature of 225°F (107°C) and minimum of -60°F (-51°C), this tape performs reliably over a wide variety of temperature conditions. The heat and light reflective properties provide additional protection, insulation, and enhanced lighting efficiency. Each case contains 32 rolls of 3/8 inch width by 36 yards length with a total thickness of 6.3 mils, offering excellent value for high-volume industrial operations. This product is formulated for industrial and occupational use only and is not intended for consumer sale or use.
Key Features
- Electrically and thermally conductive lead foil backing for superior electrical path continuity
- Highly conformable and pliable design allows shaping into complex patterns and die-cutting into specific shapes
- Resists flame, moisture, weather, UV degradation, chemicals, and radiation exposure
- Heat and light reflective properties provide protection, insulation, and enhanced lighting efficiency
- Rubber-based adhesive with excellent initial grab and long-lasting bond that removes cleanly from surfaces
- Performs reliably across wide temperature range from -60°F to 225°F (-51°C to 107°C)
- Lead foil can be burnished for full adhesive coverage and metal-to-metal contact
- Acid and base resistant formulation ideal for electroplating and chemical applications
Technical Specifications
| Specification |
Value |
| Product Name | 3M™ Lead Foil Tape 421 |
| Part Number | 421 |
| 3M Product Number | 421 |
| 3M ID | 7010334287 |
| UPC Code | 00051138953126 |
| Product Color | Dark Silver |
| Backing Material | Lead Foil |
| Adhesive Type | Rubber |
| Backing Thickness (Imperial) | 4 mil |
| Backing Thickness (Metric) | 0.1 mm |
| Adhesive Thickness (Metric) | 0.1 mm |
| Overall Width (Imperial) | 0.37 in |
| Overall Width (Metric) | 9.52 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 |
| Tensile Strength (Imperial) | 15 lb/in |
| Tensile Strength (Metric) | 26.3 N/100mm |
| Elongation at Break | 14% |
| Maximum Operating Temperature (Fahrenheit) | 225 ℉ |
| Maximum Operating Temperature (Celsius) | 107 ℃ |
| Minimum Operating Temperature (Fahrenheit) | -60 ℉ |
| Minimum Operating Temperature (Celsius) | -51 ℃ |
| Shelf Life | 18 Months |
| Smallest Saleable Unit | Roll |
| Units per Case | 32 Rolls |
| 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 |
| Use Type | Industrial and occupational use only |
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