3M™ Lead Foil Tape 421

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Conformable tape resists flame, moisture, weather, UV degradation, and many chemicals

Performs over a wide variety of temperature conditions and is heat reflective

Heat and light reflective tape protects, insulates and enhances lighting efficiency

Frequently viewed resources

Safety Data Sheet (PDF)

Overall Width (Imperial)

Overall Width (Metric)

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Details

Highlights

Conformable tape resists flame, moisture, weather, UV degradation, and many chemicals
Performs over a wide variety of temperature conditions and is heat reflective
Heat and light reflective tape protects, insulates and enhances lighting efficiency
Can be die-cut into specific shapes for assembly and manufacturing processes
The rubber-based adhesive combined with the rugged, durable backing provides long service life

3M™ Lead Foil Tape 421 Is an electrically and thermally conductive tape. This highly conformable tape resists flame, moisture, weather, UV degradation, chemicals and radiation. The malleable tape can be shaped into complex or detailed patterns or die-cut into specific shapes to meet assembly and manufacturing process needs.

3M™ Lead Foil Tape 421 is a dark gray, lead foil backed tape is coated with a distinct green rubber adhesive that offers good initial grab and a long-lasting bond that removes cleanly for most surfaces.

Pliable and Conductive Lead Tape
3M™ Lead Foil Tape 421 is a dark gray, lead foil backed tape coated with a distinct green rubber adhesive that offers good initial grab and a long-lasting bond that removes cleanly from most surfaces. It is an extremely conformable and pliable tape that can be formed into detailed and intricate shapes and patterns. The lead foil backing can be burnished to fully cover the adhesive and allow full contact of the lead foil to the metal base. This metal to metal contact results in a continuation of the electrical path, reducing build-up at the adhesive interface. This lead foil tape is formulated to be electrically and thermally conductive and carries a strong acid and base resistance, making it ideal for electroplating, as a radiation barrier or x-ray plate masking.

Recommended Applications

Masking applications in electroplating
Radiation barrier
Moisture barrier
Chemical milling

Typical properties

Details

Adhesive Type	Rubber
Back Side Adhesive Thickness (Metric)	0.1 mm
Backing (Carrier) Material	Lead Foil
Backing (Carrier) Thickness (Imperial)	4 mil
Backing (Carrier) Thickness (Metric)	0.1 mm
Brands	3M™
Elongation at Break	14.0 %
Industries	Aerospace, Appliance, Construction, Metalworking, Military & Government, Transportation, Automotive, Electronics, General Industrial, Specialty Vehicle
Maximum Operating Temperature (Celsius)	107 ℃
Maximum Operating Temperature (Fahrenheit)	225 ℉
Minimum Operating Temperature (Celsius)	-51 ℃
Minimum Operating Temperature (Fahrenheit)	-60 ℉
Product Color	Dark Silver
Shelf Life	18 Month
Smallest Saleable Unit	Roll
Tensile Strength (Imperial)	15.0 lb/in
Tensile Strength (Metric)	26.3 N/100mm, 263 N/100mm
Total Tape Thickness without Liner (Imperial)	6.3 mil
Total Tape Thickness without Liner (Metric)	0.16 mm
Units per Case	1.0, 2.0, 6.0, 9.0, 12.0, 16.0, 18.0, 32.0, 36.0

Dimensions and Classifications

Overall Length (Imperial)	36 yd
Overall Length (Metric)	32.91 m
Overall Width (Imperial)	0.25 in, 0.37 in, 0.5 in, 0.75 in, 1 in, 2 in, 3 in, 6 in, 12 in, 23 in
Overall Width (Metric)	6.35 mm, 9.52 mm, 12.7 mm, 19.05 mm, 25.4 mm, 50.8 mm, 76.2 mm, 152.4 mm, 304.8 mm, 584.2 mm

Resources

3M™ Lead Foil Tape 421

Safety Data Sheets

Document Number: MSDS_1130962_US_EN

(PDF)

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	Current product 3M™ Lead Foil Tape 421	3M™ Aluminum Foil Tape 427	3M™ Aluminum Foil Tape 425
Backing (Carrier) Thickness (Imperial)	4 mil
Overall Width (Metric)	6.35 mm, 9.52 mm, 12.7 mm, 19.05 mm, 25.4 mm, 50.8 mm, 76.2 mm, 152.4 mm, 304.8 mm, 584.2 mm
Overall Width (Imperial)	0.25 in, 0.37 in, 0.5 in, 0.75 in, 1 in, 2 in, 3 in, 6 in, 12 in, 23 in
Backing (Carrier) Thickness (Metric)	0.1 mm
Adhesive Type	Rubber

For industrial/occupational use only. Not for consumer sale or use.

3M industrial and occupational products are intended, labeled, and packaged for sale to trained industrial and occupational customers for workplace use. Unless specifically stated otherwise on the applicable product packaging or literature, these products are not intended, labeled, or packaged for sale to or use by consumers (e.g., for home, personal, primary or secondary school, recreational/sporting, or other uses not described in the applicable product packaging or literature), and must be selected and used in compliance with applicable health and safety regulations and standards (e.g., U.S. OSHA, ANSI), as well as all product literature, user instructions, warnings, and other limitations, and the user must take any action required under any recall, field action, or other product use notice. Misuse of 3M industrial and occupational products may result in injury, sickness, death, or property damage. For help with product selection and use, consult your on-site safety professional, industrial hygienist, or other subject matter expert.