Structural Adhesive Film

AF 32

- 4 -

Miscellaneous Data Scotch-Weld AF 32 (continued)

Control

1 Year

2 Years

3 Years

-67°F

-55°C

4491 psi

30.9 MPa

4560 psi

31.4 MPa

4900 psi

33.8 MPa

4800 psi

33.1 MPa

75°F

24°C

4216 psi

29.6 MPa

3880 psi

26.7 MPa

4350 psi

30.0 MPa

3930 psi

27.1 MPa

180°F

82°C

2186 psi

15.1 MPa

2250 psi

15.5 MPa

2510 psi

17.3 MPa

2340 psi

16.1 MPa

250°F

121°C

1336 psi

9.2 MPa

1320 psi

9.1 MPa

1550 psi

10.7 MPa

1520 psi

10.5 MPa

300°F

149°C

1036 psi

7.1 MPa

1120 psi

7.7 MPa

1140 psi

7.9 MPa

940 psi

6.5 MPa

G. Scotch-Weld AF 32 /3M™ Scotch-Weld™ Structural Adhesive Primer EC-1660 Overlap Shear After

Aging for 1, 2 and 3 Years in South Florida

Cured 60 minutes @ 350°F (177°C), 100 psi, 10°F/minute rise rate.

H. Scotch-Weld AF 32 Radiation Exposure Data

Radiation Temperature: 75°F (24°C)

Test: ASTM D 1002 Overlap Shear

Test Temperature

-67°F (-55°C)

75°F (24°C)

250°F (121°C)

Average Strength

4578 psi (31.6 MPa)

4783 psi (33.0 MPa)

1150 psi (7.9 MPa)

Strength Retention (%)

Megarad Dosage

Failure

-67°F (-55°C)

75°F (24°C)

250°F (121°C)

0

Cohesive

100

100

100

100

Cohesive

88

100

85

200

Cohesive

83

100

77

300

Cohesive

80

93

47

500

Adhesion

73

83

47

700

Adhesion

56

74

47

900

Adhesion

30

38

47

Metal = 2024-T3 clad aluminum.

Surface Prep = FPL etch.

Primer = None.

Adhesive Cure = 350°F (177°C) for 60 minutes, 150 psi press pressure, hot entry.

These overlap shear data imply that Scotch-Weld AF 32 nitrile phenolic film adhesive can withstand about 300 megarad

dosage level at 75°F (24°C) with satisfactory strength retention. The ability to withstand service at elevated temperature up to

250°F (121°C) is lost at high dosages.

Average

Test

Aged 3 months

Type

Test

Temperature

Unaged

75°F ± 5°F (24°C ± 2.2°C)

Failure

Shear Strength

75°F ± 2°F

(24°C ± 1.1°C)

3825 psi

26.4 MPa

4191 psi

28.9 MPa

Cohesive

Shear Strength

180°F ± 2°F (82°C ± 1.1°C)

2287 psi

15.8 MPa

2222 psi

15.3 MPa

Cohesive

Shear Strength (After

75°F ± 2°F

(24°C ± 1.1°C)

3818 psi

26.3 MPa

4020 psi

27.7 MPa

Cohesive

30 day Salt Spray

FED STD 151)

I. Scotch-Weld AF 32 /Scotch-Weld EC-1660 Storage Life Testing

The following data indicates that the uncured Scotch-Weld AF 32/Scotch-Weld EC-1660 system does not degrade

with storage at 75°F ± 5°F (24°C ± 2.2°C) for 3 months.

A cure cycle of 100 psi bonding pressure applied by a platen press and a 200°F/minute bond line temperature rise

from 80°F to 350°F (26°C to 182°C) with 120 ± 1 minute at 350°F ± 2°F (182°C ± 1.1°C) was used. 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.