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3M

Epoxy Adhesive

DP420 Black • DP420 NS Black • DP420 Off-White • DP420 LH

Typical Adhesive

Performance

Characteristics

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 2024T-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.

Bell Peel (ASTM D 3167)

Bell peel strengths were measured on 1/2 in. wide bonds at the temperatures noted. The testing

jaw separation rate was 6 in. per minute. The bonds are made with 0.064 in. bonded to 0.025 in.

thick adherends.

D.

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)

Metals, Overlap Shear, Tested @ 73°F (23°C) (PSI)

3M™ Scotch-

Weld

™ Epoxy

Adhesive DP420

Black

3M™ Scotch-

Weld

™ Epoxy

Adhesive DP420

Off-White

3M™ Scotch-

weld™ Epoxy

Adhesive DP420NS

Black

Aluminum-

Etched

4500

4500

4500

Oakite degrease

4000

3500

NT

MEK/abrade/MEK

2500

3500

3500

Cold Rolled Steel- Oakite degrease

—

4000

NT

MEK/abrade/MEK

2200

2700

2500

Copper-

MEK/abrade/MEK

5000

4000

3000

Brass-

MEK/abrade/MEK

2800

4100

3500

Stainless Steel-

MEK/abrade/MEK

1800

1700

3900

Galvanized Steel- Hot dipped

2900

2000

NT

Electrodeposited

3000

2100

NT

3M™ Scotch-Weld™

Epoxy Adhesive DP420

Black

3M™ Scotch-Weld™

Epoxy Adhesive DP420

Off-White

3M™ Scotch-Weld™

Epoxy Adhesive

DP420NS Black

-67°F (-55°C)

4500

4500

4500

4500

73°F (23°C)

4500

4500

4500

1260

450

860

1400

1600

21

2250

700

1400

2980

750

1600

2690

2500

2100

570

200

350