3

Structural Adhesive Film

AF 191

Introduction

3M™ Scotch-Weld™ Structural Adhesive Film AF 191 is a thermosetting, modified

epoxy designed for bonding composites, metal to metal and metal to honeycomb

components where high strength and peel at 350°F (177°C) is required. It offers the

following advantages:

• Unique toughening system.

• High shear strength.

• Excellent elevated temperature performance.

• Extremely high peel strength.

• Excellent long-term durability.

• Excellent cryogenic performance.

• Flexible cure cycles (275-400°F).

• Unsupported versions (Scotch-Weld AF 191U Film) available for reticulation.

• Isolation version (Scotch-Weld AF 191G108 Film) available for bonding

dissimilar substrates.

• Sprayable version of Scotch-Weld AF 191 Film available (3M™ Scotch-Weld™

Structural Adhesive Primer EC-3710).

• Available with light-weight conductive screens for lightning strike/composite

surfacing applications.

Technical Datasheet

March 2009

Product Description

Product

Scotch-Weld

Scotch-Weld Scotch-Weld

Scotch-Weld

Scotch-Weld

Scotch-Weld

Scotch-Weld Scotch-Weld

AF 191K

AF 191K

AF 191M

AF 191M

AF 191M

AF 191U

AF 191U

AF 191U

Film

Film

Film

Film

Film

Film

Film

Film

.100

.08

.06

.035

.030

.05

.035

.015

488

390

293

170

146

244

170

73

Film Thickness (mils)

16

13

10

6

5

8

6

2.5

Scrim: K = Nylon Knit

M = Polyester Matte

KK

MM

M

U

U

U

U = Unsupported

Recommended Cure

Temperature:

350°F (177°C)*

Recommended Cure Time:

1 Hour*

Volatile Content:

Less than 1%

Color:

Tan

*Note: See alternate cure cycle information.