Electrically and thermally conductive lead foil tape with rubber adhesive for industrial shielding, masking, and radiation protection applications. Conformable, flame-resistant, and operates across wide temperature range.
3M™ Lead Foil Tape 421 is an electrically and thermally conductive tape engineered for industrial applications requiring superior electromagnetic shielding and radiation protection. This highly conformable tape features a dark gray lead foil backing coated with a distinct green rubber adhesive that offers excellent initial grab and long-lasting bonds that remove 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 resists flame, moisture, weather, UV degradation, chemicals, and radiation, making it ideal for demanding industrial environments. With a rubber-based adhesive combined with rugged, durable lead foil backing, this tape provides exceptional service life across a wide temperature range from -60°F to 225°F. The lead foil backing can be burnished to fully cover the adhesive and allow complete metal-to-metal contact with the base surface, resulting in a continuous electrical path that reduces build-up at the adhesive interface.
This conformable and pliable tape is specifically formulated for electroplating masking applications, radiation barriers, moisture barriers, and chemical milling operations. The combination of electrical conductivity, thermal conductivity, and strong acid and base resistance makes it an excellent choice for x-ray plate masking and other specialized industrial applications requiring both mechanical protection and electromagnetic properties.
Key Features
- Electrically and thermally conductive lead foil backing ensures superior electromagnetic shielding
- Highly conformable and pliable design allows shaping into complex patterns and die-cutting
- Resists flame, moisture, weather, UV degradation, chemicals, and radiation
- Wide operating temperature range from -60°F to 225°F with heat reflective properties
- Green rubber adhesive provides excellent initial grab with clean removal from most surfaces
- Lead foil can be burnished for complete metal-to-metal contact and continuous electrical path
- Strong acid and base resistance ideal for electroplating and chemical milling applications
- Durable backing combined with rubber adhesive provides exceptional long service life
Technical Specifications
| Specification |
Value |
| Product Name | 3M™ Lead Foil Tape 421 |
| Part Number | 421 |
| 3M Product Number | 421 |
| 3M ID | 7000049079 |
| UPC | 00051138953072 |
| Product Color | Dark Silver |
| Backing Material | Lead Foil |
| Adhesive Type | Rubber |
| Overall Width (Imperial) | 0.75 in |
| Overall Width (Metric) | 19.05 mm |
| Overall Length (Imperial) | 36 yd |
| Overall Length (Metric) | 32.91 m |
| Backing Thickness (Imperial) | 4 mil |
| Backing Thickness (Metric) | 0.1 mm |
| 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 ℉ |
| Maximum Operating Temperature (Celsius) | 107 ℃ |
| Minimum Operating Temperature (Fahrenheit) | -60 ℉ |
| Minimum Operating Temperature (Celsius) | -51 ℃ |
| Shelf Life | 18 Months |
| Units per Case | 12 Rolls |
| Smallest Saleable Unit | Roll |
| Brand | 3M™ |
| Recommended Applications | Electroplating masking, radiation barrier, moisture barrier, chemical milling, x-ray plate masking |
| Industries | Aerospace, Appliance, Automotive, Construction, Electronics, General Industrial, Metalworking, Military & Government, Specialty Vehicles, Transportation |
| Usage | For industrial/occupational use only. Not for consumer sale or use. |
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