Data Sheet

3
Aluminum Foil Tape
431
•
439L (Linered)
Technical Data
Product Description
3M™ Aluminum Foil Tape 431 and 439L is a 2-mil nominal dead soft aluminum
foil with transparent acrylic adhesive for many permanent sealing, holding, splicing
or masking applications requiring the protection offered by a foil backing.
IMPORTANT: 3M™ Aluminum Foil Tape 431 and 439L are not intended for medical usage.
Neither 3M nor the Food and Drug Administration have evaluated or reviewed this tape for
medical application. User assumes all risk and liability whatsover in connection with usage of
product in a medical application.
Product Construction
Backing Adhesive Color Liner (3M tape 439L) Standard Roll Length
Aluminum foil Acrylic Shiny silver Tan kraft paper with 60 yds. (55 m)
silicone release
Features
• Flame resistant. Meets U.L. 723, Class “L” low flammability rating (File R 7311).
• Meets requirements of F.A.R. 25.853(a).
• Foil backing provides an excellent reflective surface for both heat and light.
• Good aging performance both indoors and outdoors.
• Low moisture vapor transmission rate offers excellent sealing and patching
performance.
• Best results attained when applied to clean dry surface above 32°F (0°C).
Typical Physical
Properties
ASTM Test Method
Adhesion to Steel: 41 oz./in. width (45 N/100 mm) D-3330
Tensile Strength at Break: 3M tape 431 19 lbs./in. width (338 N/100 mm) D-3759
3M tape 439L 18 lbs./in. width (315 N/100 mm) D-3759
Elongation at Break: 3M tape 431 5% D-3759
3M tape 439L 3%
Backing Thickness: 1.9 mils (0.05 mm) D-3652
Total Tape Thickness: 3.1 mils (0.08 mm) D-3652
Liner Thickness: 3M tape 439L 5.6 mils (0.14 mm) D-3652
Water Vapor 0.1 gms H
2
O/100 sq. in./24 hrs. D-3833
Transmission Rate: (1.55 g/m
2
/24 hrs.)
Temperature Use Range: -65° to 300°F (-54° to 149°C)
Weight: 0.0096 lbs./yd./in. width (.0049 kg/m/24 mm)
Note: The following technical information and data should be considered representative
or typical only and should not be used for specification purposes.