Lead Foil Tape

Model # 421

3M421 is a 6.3 mil. lead foil backing with a rubber adhesive used as a maskant in electroplating and chemical milling and as a moisture and radiation barrier in certain applications. 421 tape has very good conformability, easier and faster to work with than linered lead foil. It also has good thermal properties and will perform over a wide variety of temperature conditions (-65°F to 225°F). It has been used at higher temperatures for shorter durations. Tape is electrically and thermally conductive. Elevated lead levels in water may result from long term submersion of this product. Best results are obtained when applied to a clean and dry surface above 32°F. Also, by “feathering” the edges, rubbing the tape down with a smooth edged plastic piece (or similar object), the tape can be made to better conform to the substrate. This is especially important if the tape is to be used as a “thief” in electroplating where the edges must fully contact the metal base. To obtain best performance, use this product within 12 months from date of manufacture and store under normal conditions of 60°F to 80°F and 40% to 60% relative humidity in the original carton. Disposal and sfety considerations: *Wear protective gloves and/ or wash hands after working with tape. *Lead will slowly leach into water when submerged, leaching will accelerate as acidity increases. *This material, when disposed of separately, is classified as RCRA hazardous waste, please consult applicable Federal, State and local regulations for proper disposal.

Adhesion
• 15.00 lbs/in

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