3M 421 is a 6.3 mil industrial grade metal foil tape used for electroplating, creating radiation and moisture barriers, masking for paint stripping, chemical milling, adding weight to components, and masking x-ray plates. This product features excellent conformability and electrical and thermal conductivity.
Masking applications in electroplating Radiation barrier Moisture barrier Chemical milling X-ray plate masking
Electrically and thermally conductive
Resists flame, moisture, weather, UV degradation, and many chemicals used in electroplating and anodizing processes
Rubber-based adhesive bonds well to a variety of surfaces, including most metals
Excellent conformability in a variety of application conditions, indoors and out
Performs over a wide variety of temperatures and is heat reflective