Structural Adhesive Film

AF 31

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6. Heat aging of 3M™ Scotch-Weld™ Structural Adhesive Film AF 31/3M™ Scotch-Weld™ Structural

Adhesive Primer EC-2174 on Aluminum and Titanium. The adhesive was cured as indicated below.

The primer was air dried 30 minutes plus force dried 30 minutes at 250°F (121°C).

Product Performance

(continued)

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

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

Exposure Time and

Cure

Overlap Shear Strength (psi)

Temperature

Cycle

75°F (24°C)

300°F (149°C)

400°F (204°C)

2024 T-3 Alclad Aluminum

Control

A

3800

1960

500 hours at 300°F (149°C)

A

3410

2180

1000 hours at 300°F (149°C)

A

2980

2070

2000 hours at 300°F (149°C)

A

3240

2150

3000 hours at 300°F (149°C)

A

3170

2190

Control

B

4150

1710

192 hours at 400°F (204°C)

B

3850

1730

Control

C

3390

1240

192 hours at 400°F (204°C)

C

2790

1420

6,4 Titanium Alloy

Control

B

880

880

192 hours at 400°F (204°C)

B

640

820

Control

C

1490

630

192 hours at 400°F (204°C)

C

1310

1030

Cure Cycle A – 350°F (177°C), 45 minutes, 100 psi, 10°F/minute rise rate.

Cure Cycle B – 350°F (177°C), 120 minutes, 100 psi, 10°F/minute rise rate.

Cure Cycle C – Cure Cycle B plus post cured 120 minutes at 500°F (260°C).

7. Long Term Aging at 500°F (260°C) on Stainless Steel using a 350°F (177°C) cure for 120 minutes, 100 psi,

10°F rise rate/min.

Effect of 500°F (260°C) Aging on Overlap

Shear Strength of Scotch-Weld AF-31 / Scotch-Weld EC-2174