3M™ Heavy Duty Aluminum Foil Tape 438

Technical Information Note

The following technical information and data should be considered representative or typical only and should not be

used for speci cation purposes.

Typical Physical Properties

Property

Values

Method

Color

Shiny Silver

Total Tape Thickness

0.18 mm

7.2 mil

ASTM D3652

Backing Thickness

0.13 mm

5 mil

ASTM D3652

Backing

Aluminum Foil

Adhesive

Acrylic

Approximate Weight

0.0109 g/m/24 mm

0.0217 lb/yd/in

Water Vapor

Transmission

0.77 g/m²/24 hr

0.05 g/100 in²/24 hr

ASTM D3833

Typical Performance Characteristics

Table continued on next page

Property Values

Method

Dwell/Cure

Time

Substrate

Notes

180°

Peel

Adhesion

4.7 N/cm

43 oz/in

ASTM

D3330

Initial

Stainless

Steel

12 in/min (300 mm/min)

Tensile

Strength

103 N/cm

59 lb/in

ASTM

D3759

Elongation

at

Break

10 %

ASTM

D3759