Epoxy Adhesive EC-3333 B/A

Technical Datasheet

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Product Performance

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

or typical only and should not be used for specification purposes.

The following performance data has been obtained in the 3M Laboratory under the

conditions specified.

Aluminum to Aluminum Bonds

A. Overlap Shear - Primed Aluminum

The following data show typical values obtained with 3M™ Scotch-Weld™ Epoxy

Adhesive EC-3333 B/A in aluminum overlap shear bonds. All tests were run on 1"

wide x 1/2" overlap specimens cut from .063" thick 2024-T3 Alclad aluminum

panels which had been FPL etched and primed with 3M™ Scotch-Weld™ Structural

Adhesive Primer EC-3960. Bonds were cured for 7 days at 70-80°F under 2 psi

pressure. Tests were conducted according to MMM-A-132B methods.

Test Temperature

Overlap Shear Strength

-67°F

4500 psi

75°F

5500 psi

160°F (30 minutes at 160°F)

2000 psi

75°F (after 14 days exposure to

160°F and 100% relative humidity

5300 psi

Floating Roller Peel

Scotch-Weld EC-3333 B/A Adhesive Test Results

75°F

94 lb/inch width

B. Miscellaneous Tests - Unprimed Aluminum

The following data show typical values obtained with Scotch-Weld EC-3333 B/A

Adhesive on unprimed, optimized FPL etched, 2024-T3 Alclad aluminum using

MMM-A-132B test procedures. Scotch-Weld EC-3333 B/A Adhesive was cured

for at least 5 days at 70-75°F under 2 psi pressure.

C. Floating Roller Peel

Floating Roller Peel specimens consist of one .063" x 8" x 8" 2024T3 alclad

aluminum panel bonded to one .020" x 8" x 10" 2024T3 Alclad aluminum panel.

The panels were phosphoric acid anodized (3M Test Method C-2780), and primed

with 0.2 mils of Scotch-Weld EC-3960 Primer. They cured for 5 days at room

temperature under 2 psi pressure. The panels were cut into 1" wide specimens,

and tested using a jaw separation rate of 6"/minute according to ASTM D-3167.

Description

Scotch-Weld EC-3333 B/A Adhesive Test Results

1. -67°F Tensile Shear

4440 psi

2. 75°F Tensile Shear

5300 psi

3. Fatigue Strength at 750 psi at 1800 cpm

no failures

4. Creep Rupture 192 hours at 75°F at 1600 psi

0.000 inch

5. Blister Detection

4200 psi

6. 75°F Tensile Shear after 30 days at 120°F

4950 psi

and 95-100% RH

7. 75°F Tensile Shear after 7 days in JP-4

5600 psi

8. 75°F Tensile Shear after 7 days Hydraulic Oil

4800 psi

9. 75°F T-Peel (0.020 inch thick metal)

41 lb/inch