August 2019

I. Surface Preparation

A thoroughly cleaned, dry grease-free surface is essential for maximum performance. Cleaning methods which will

produce break-free water film on metal surfaces are generally satisfactory.

A. Aluminum

1. The best performance will be achieved with the surface preparation by alkaline degreasing, then FPL etching

according to ASTM D2674, and followed by phosphoric acid anodizing according to ASTM D3933.

*CAUTION: Use adequate eyes, skin and respiratory protection when using etch solutions.

B. Aluminum Honeycomb Core

1. Soak in clean aliphatic naphtha (to conform to TT-N-95A) for five minutes at room temperature. Dry 10

minutes at 150°F ± 5°F (66°C ± 2°C).

2. Optional – Immerse in etching solutions for 2 minutes at 150°F ± 5°F (66°C ± 2°C). Rinse, air dry and force dry

in similar manner to skin panels.

3M™ Scotch-Weld™

Structural Adhesive Film AF 143-2

Technical Data Sheet

Introduction

3M™ Scotch-Weld™ Structural Adhesive Film AF 143-2 is designed for the bonding of honeycomb and metal to metal

components where high strengths at 350°F (177°C) are required. Preliminary indications are that Scotch-Weld AF 143-

2 will give excellent performance in the -67°F to 350°F (-55°C to 177°C) temperature range. Scotch-Weld AF 143-2

has an embossed liner which yields improved porosity control in metal to metal applications.

Product Description

Note: The following technical information and data should be considered representative or typical only and should not be used for

specification purposes.

Color:

Tan

Base:

Modified Epoxy

Form:

Flexible Supported Adhesive Film

Weight:

0.095 - 0.110 psf

Nominal Thickness:

0.016 inches

Product Application

Note: While this information is provided as a general application guideline based upon typical conditions, it is recognized that no

two applications are identical due to differing assemblies, method of heat and pressure application, production equipment and

other limitations. It is therefore suggested that experiments be run, within the actual constraints imposed, to determine optimum

conditions for your specific application and to determine suitability of product for the intended use.