Structural Adhesive Film

AF 126 • AF 126 FR

- 6 -

Product Performance (continued)

Primer Dry Time Experiment

3M™ Scotch-Weld™ Structural Adhesive Primer EC-2320 Cure Conditions:

Primer Cure

Overlap Shear Test Results

Time (hrs)

Temp. (°F)

-67°F

-55°C

73°F

23°C

180°F

82°C

250°F

121°C

1

75

5932 psi

40.9 MPa

5800 psi

40.0 MPa

3690 psi

25.4 MPa

2003 psi

13.8 MPa

2

75

5526 psi

38.1 MPa

5697 psi

39.3 MPa

3590 psi

24.7 MPa

1680 psi

11.6 MPa

3

75

5800 psi

40.0 MPa

5540 psi

38.2 MPa

3786 psi

26.1 Mpa

1473 psi

12.2 MPa

1/2

150

5343 psi

36.8 MPa

5076 psi

35.0 MPa

3796 psi

26.2 Mpa

1297 psi

8.9 MPa

1/2

250

6490 psi

45.4 MPa

5700 psi

39.3 MPa

3957 psi

27.3 Mpa

1553 psi

10.7 MPa

1

250

6386 psi

44.0 MPa

6006 psi

41.4 MPa

3977 psi

27.4 Mpa

1433 psi

9.9 MPa

2

250

5466 psi

37.7 MPa

5817 psi

40.1 MPa

4010 psi

27.6 Mpa

1327 psi

9.1 MPa

Includes a 1/2 hour, 75°F (24°C) air dry for those panels given an elevated temperature cure.

Cure Cycle: 6-8°F/minute rise, 250°F, 60 minutes, 50 psi (3.3-4.4°C/minute rise, 121°C, 60 minutes, 0.35 MPa).

A second test was made to determine the effect of primer dry temperature as well as the effect of 75°F (24°C) aging after force drying. The

results indicated that 1/2 hour at 200°F (93°C) was close to optimum and that up to 1 week aging after the primer force dry had little effect on

250°F (121°C) overlap shear values.

Adhesive Primer EC-2320 Cryogenic Test

Typical Scotch-Weld EC-2320 primed overlap shear test specimens were cured for 1 hour at 250°F (121°C) and

then tested at -323°F (-197°C). Test results were as follows:

Control specimens: 5273 psi at 75°F (36.3 MPa at 24°C)

Test specimens:

4217 psi at -323°F (29.1 MPa at -197.2°C)

Overlap Shear Test Results

-67°F

-55°C

75°F

24°C

180°F

82°C

250°F

121°C

Adherend

Primer Used

psi

MPa

psi

MPa

psi

MPa

psi

MPa

Aluminum – 63 mil

Scotch-Weld EC-2320

5220

36.0

4815

33.2

3080

21.2

1360

9.4

2024 T3 clad (etched)

None

5090

35.1

4955

34.1

2860

19.7

1420

9.8

Magnesium

Scotch-Weld EC-2320

2260

15.6

2600

17.9

1520

10.5

610

4.2

Dow 7 Treated

None

1840

12.7

4150

28.6

2540

17.5

750

5.2

Titanium Alloy

Scotch-Weld EC-2320

6270

43.2

4730

32.6

2340

16.1

520

3.6

6-4

50 mil

Scotch-Weld EC-3901

6380

44.0

5280

36.4

3650

25.1

Not Tested

Not Tested

None

8310

57.3

5650

38.9

3100

21.4

1320

9.1

Stainless Steel

Scotch-Weld EC-2320

7597

52.3

6280

43.3

3343

23.0

1040

7.2

Type 17-7

Scotch-Weld EC-3901

10203

70.3

6310

43.5

3600

24.8

1913

13.2

50 mil

None

9877

68.1

6200

42.7

3487

24.0

1480

10.2

Overlap Shear Tests

Cure Cycle: 250°F, 50 psi, 60 minutes, 6-8°F/minute rise (121°C, 0.35 MPa, 60 minutes, 3.3-4.4°C/minute rise).

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

typical only and should not be used for specification purposes.