Adhesive tape for masking during chrome plating as protection against blistering, as well as for radiation protection and marking in X-ray technology. 3M Metal Tape 420 is a silver, lead-containing tape coated with a distinctive green rubber-resin adhesive that provides good initial adhesion and long-lasting hold, which cleanly removes from most surfaces. It is an extremely adaptable and flexible tape that can be shaped into detailed and complex forms and patterns. The lead carrier material can be blued to fully cover the adhesive and allow for complete contact of the lead foil with the metal substrate. This metal-to-metal contact ensures continuity of the electrical pathway and reduces deposits at the adhesive site. The tape is formulated to be electrically and thermally conductive and has strong resistance to acids and bases.