Structural Adhesive Films

AF 6 • AF 10 • AF 13

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Primer Application

3M™ Scotch-Weld™ Structural Adhesive Films AF 6, AF 10 and AF 13

Priming of adherends offers two distinct advantages: a) ensures complete wetting of

metal surfaces which normally results in superior environmental properties, and

b) simplified production by protecting clean parts until bonding can be completed.

3M™ Scotch-Weld™ Structural Adhesive Primer EC-1290 has been applied

successfully by flow coating, brushing and spraying.

Application: See the Scotch-Weld EC-1290 data sheet for the suggested primer

applications.

Primer Dry: A primer dry coat which will result in a solvent-free coating is generally

satisfactory. Drying temperatures above 300°F (149°C) should be avoided since a

primer overcure will hinder wetting action of the adhesive film to the primer.

The following chart lists suggested dry cycles for Scotch-Weld EC-1290.

Air Dry

Force Dry

Force Dry Temp.

EC-1290

60 min.

30 min.

180°F (82°C)

60 min.

30 min.

240°F (116°C)

The primer surface, after cooling to ambient temperature, is ready for adhesive

bonding. The primed surface should be protected from contamination introduced by

dust, finger prints, oil, etc.

Film Application

3M™ Scotch-Weld™ Structural Adhesive Films AF 6, AF 10 and AF 13

Care should be taken to avoid contaminating adhesive and cleaned or primed

aluminum by an substance which will hinder wetting action of the adhesive.

a. Cut portion of film to be used from roll with protective liner in place.

b. Place film on metal using the liner as a protective cover.

c. Roll film into position with a rubber roller insuring that no air is trapped between

primer and film.

d. Film can be heat or solvent tacked (Scotch-Weld EC-1290 primer or ketone) into

position.

e. Remove protective liner.

f. Assembly parts and cure.

Excess primer and equipment may be cleaned up, prior to curing, with ketone* type

solvent.

*Note: When using solvents for cleanup, extinguish all sources of ignition in the area