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Scotch-Weld
TM
Epoxy Adhesive
DP-4XL
Surface Preparation
(continued)
Typical Adhesive
Performance
Characteristics
Plastics/Rubber
1. Wipe with isopropyl alcohol.*
2. Abrade using fine grit abrasives (180 grit or finer).
3. Wipe with isopropyl alcohol.*
Glass
1. Solvent wipe surface using acetone or MEK.*
2. Apply a thin coating (0.0001 in. or less) of 3M? Scotch-Weld? Structural
Adhesive Primer EC-3901 to the glass surfaces to be bonded and allow the primer
to dry a minimum of 30 minutes @ 75°F (24°C) before bonding.
*Note: When using solvents, extinguish all ignition sources and follow the
manufacturer’s precautions and directions for use. Use solvents in
accordance with local regulations.
Note: The following technical information and data should be considered representative
or typical only and should not be used for specification purposes.
Substrates and Testing
A. Overlap Shear (ASTM D 1002-72)
Overlap shear (OLS) strengths were measured on 1 in. wide 1/2 in. overlap
specimens. These bonds were made individually using 1 in. x 4 in. pieces of
substrate except for aluminum. Two panels 0.063 in. thick, 4 in. x 7 in. of 2024
T-3 clad aluminum were bonded and cut into 1 in. wide samples after 24 hours.
The thickness of the bondline was 0.005-0.008 in. All strengths were measured
at 73°F (23°C) except where noted.
The separation rate of the testing jaws was 0.1 in. per minute for metals, 2 in.
per minute for plastics and 20 in. per minute for rubbers. The thickness of the
substrates were: steel, 0.060 in.; other metals, 0.05-0.064 in.; rubbers, 0.125 in.;
plastics, 0.125 in.
B. T-peel (ASTM D 1876-61T)
T-peel strengths were measured on 1 in. wide bonds at 73°F (23°C). The testing
jaw separation rate was 20 inches per minute. The substrates were 0.032 in. thick.
C. Cure Cycle
With the exception of Rate of Strength Build-Up Tests, all bonds, were cured
7 days at 73°F (23°C) at 50% RH before testing or subjected to further
conditioning or environmental aging.
Aluminum, Overlap Shear, at Temperature (PSI)
(3 week room temperature cure 73°F [23°C])
DP-4XL Adhesive
-67°F (-55°C)
73°F (23°C)
180°F (82°C) (15 min.) 1
180°F (82°C) (30 min.) 1
180°F (82°C) (60 min.) 1
180°F (82°C) (4 hr.) 1
250°F (121°C) (15 min.) 1
2800
4880
440
630
1240
2400
280
1 Represents
time in test chamber oven before test.
-4-
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