Bonding Film

AF 131-2

- 2 -

Product Application

The Product Performance data reported in the next section were developed using the

following recommended procedures. Other conditions are under evaluation.

I.

Surface Preparation

A thoroughly cleaned, dry, grease-free surface is essential for maximum

performance. Cleaning methods which will produce a break-free water film on

metal surfaces are generally satisfactory.

A. Aluminum Skins

1. Vapor Degrease – Hang skins in condensing vapors of perchloroethylene

for 5 minutes.

2. Alkaline Degrease – Immerse skins in Oakite No. 164 solution (9-11

oz./gallon water) at 180-200°F (82-93°C) for 10-20 minutes. Rinse in

generous quantities of clear running water.

3. Acid Etch – Place skins in either of the following solutions for 10 minutes

at 150°F ± 5°F (66°C ± 2°C). Caution: Use adequate respiratory, eye and

skin protection when using etch solutions.

4.1 - 4.9 oz./gallon

Sulfuric Acid, 66° Be

38.5 - 41.5 oz./gallon

2024T-3 aluminum (dissolved)

0.2 oz./gallon minimum

Tap Water as needed to balance

4. Rinse face sheets in clear running water.

5. Air dry 15 minutes; force dry 10 minutes with parts at 150°F ± 5°F

(66°C ± 2°C).

II. Adhesive Layup

Care should be taken to avoid contaminating adhesive and cleaned aluminum by

any substance which will hinder wetting action of the adhesive.

A. Film Application

1. Cut portion of film to be used from roll with protective liners in place.

2. Remove liner from one side of the film.

3. Place film on metal using a separating liner as a protective cover.

4. Roll film into position with a rubber roller, insuring that no air is trapped

between film and panel.

5. Remove second protective liner.

6. Assemble parts and cure. Tack if necessary at 120-180°F (49-82°C).