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Structural Adhesive Film

AF 31

Introduction

3M™ Scotch-Weld™ Structural Adhesive Film AF 31 is an unsupported, thermosetting

structural film adhesive designed for metal-to-metal bonding. It is especially designed

for high-temperature resistant application (up to 500°F [260°C]).

Scotch-Weld AF 31 film adhesive offers the following advantages:

• Good flexibility and shear strength at service temperatures from -67°F to 500°F

(-55°C to 260°C).

• Easy application in a dry film which can be pressure, heat, or solvent tacked in

position.

• Excellent retention of strength after aging in many environments.

• Scotch-Weld AF 31 film adhesive with 3M™ Scotch-Weld™ Structural Adhesive

Primer EC-2174 on stainless steel, known as the AF-7431 system, meets, and is

qualified to, MMM-A-132 Types III and IV.

Technical Data

March, 2006

Description

Form:

Flexible unsupported film, protected by suitable liner.

Color:

Yellow to brown.

Nominal Caliper:

9-11 mils (uncured).

Weight:

.0575 - .0725 lbs./sq. ft.

Volatile Content:

Less than 5% (2-4 gm. sample cured 1 hr. at 350°F [177°C]).

Shrinkage:

5% maximum (24 hrs. at 75°F ± 5°F [24°C ± 2°C] in horizontal

position).

Note: The following technical information and data should be considered representative

or typical only and should not be used for specification purposes.