3M 7000049079 Lead Foil Tape 421 0.75 in X 36 Yd

Product Description

The 3M 7000049079 is the 3M 421 Lead Foil Tape, an electrically and thermally conductive pressure-sensitive tape designed for shielding, insulation, and specialty fabrication work. The malleable lead foil backing conforms readily to complex surfaces, curved edges, and intricate patterns, making it well suited for die-cutting into custom shapes on assembly or manufacturing lines. The rubber-based adhesive bonds firmly to a wide range of substrates and delivers long service life in demanding environments. At 0.75 inches wide and 36 yards long per roll, each roll provides substantial coverage for repetitive tasks.

This tape is used in electrical shielding applications, thermal management, moisture barriers, and radiation attenuation where conformability and durability are required. It performs across a wide temperature range and is heat and light reflective, making it a practical choice for insulation work, ductwork detailing, and specialty manufacturing processes where foil tapes must hold their shape after forming. Licensed tradespeople and assembly technicians working in HVAC, electrical, and industrial settings are the primary installers.

Key Features

• Electrically and thermally conductive lead foil construction for shielding and insulation use
• Highly conformable backing can be shaped into complex patterns or die-cut for manufacturing processes
• Rubber-based adhesive provides strong adhesion and long service life on varied substrates
• Resists flame, moisture, weather, UV degradation, chemicals, and radiation
• Heat and light reflective surface supports insulation efficiency and thermal management
• Each roll measures 0.75 inches wide by 36 yards long

Compatibility

Designed as a general-purpose lead foil tape suitable for electrical shielding, thermal insulation, and specialty fabrication applications across industrial, HVAC, and assembly environments.

Installation Notes

Installation is typically performed by electricians, HVAC technicians, or industrial assembly personnel following applicable facility and safety guidelines. Lead foil tape should be handled in accordance with applicable health and safety regulations governing lead-containing materials, including appropriate personal protective equipment. Surfaces should be clean, dry, and free of oil or loose debris before application to ensure full adhesive contact. Do not use this tape in applications requiring certifications or ratings not confirmed in the product documentation.

Technical Specifications

• Color: Dark Silver
• Width: 0.75 inches
• Length: 36 yards
• Adhesive Type: Rubber
• Backing Material: Lead Foil
• Unit of Measure: Roll
• Weight: 1.92 pounds

Standard Information

• Brand: 3M
• Manufacturer Part Number: 7000049079