Structural Adhesive Film

AF 31

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2. 3M™ Scotch-Weld™ Structural Adhesive Film AF 31/3M™ Scotch-Weld™ Structural Adhesive

Primer EC-2174 Overlap Shear on Aluminum

The following data shows typical values obtained with Scotch-Weld AF 31 film adhesive over Scotch-Weld

EC-2174 primer in overlap bonds. All properties were measured on 1" wide 1/2" overlap specimens cut from

.063" thick 4" x 7" bonded panels of 2024 T3 clad aluminum. Tests were conducted according to MMM-A-

132 methods. All data reported in this section was developed using the following cures.

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.

Scotch-Weld AF 31/Scotch-Weld EC-2174

Test

350°F (177°C) for 120 min.

350°F (177°C) for 60 min.

Test

Temperature

100 psi 10°F rise rate/min.

45 psi 10°F rise rate/min.

Shear Strength

-67°F ± 2°F (-55°C ± 1°C)

2750 psi

2310 psi

73.5°F ± 2°F (23°C ± 1°C)

4430 psi

4070 psi

260°F ± 2°F (127°C ± 1°C)

2700 psi

—

300°F ± 2°F (149°C ± 1°C)

2550 psi

2330 psi

350°F ± 2°F (177°C ± 1°C)

2350 psi

—

Creep Rupture

73.5°F ± 2°F (23°C ± 1°C)

.003"

(192 hours)

300°F ± 2°F (149°C ± 1°C)

.006"

3. Scotch-Weld AF 31 Film Adhesive T-Peel on Aluminum

T-Peel bonds consist of bonded areas of 1" x 6" 2024 T3 clad 1" x 8" x .032" panels with one layer of Scotch-

Weld AF 31 film adhesive. Each metal skin of the T-Peel panels were pulled at a 90° angle to the bond line or

180° in relation to themselves with a jaw separation rate of 20 inches per minute.

A. Original Properties

T-Peel (lbs./inch width)

-40°F

75°F

180°F

250°F

350°F

450°F

Cure Cycle

(-40°C)

(24°C)

(82°C)

121°C

(177°C)

(232°C)

350°F (177°C), 60 min., 150 psi, 200°F

4

25

12

8

7

4

(93°C) per min. rise rate to cure

temperature.

450°F (232°C) press temperature, 350 psi,

4

27

11

8

7

4

15 seconds in the press, maximum bond

line temperature attained 412°F (211°C).