3M
™
Scotch-Weld
™
Epoxy Adhesives
DP100 Clear • DP100 NS Translucent
Surface Preparation For optimum strength structural bonds, paint, oxide films, oils, dust, mold release
agents and all other surface contaminants must be completely removed. However, the
amount of surface preparation directly depends on the required bond strength and the
environmental aging resistance desired by the user.
The following cleaning methods are suggested for common surfaces:
Steel:
1. Wipe free of dust with oil-free solvent such as acetone or isopropyl alcohol.*
2. Sandblast or abrade using clean fine grit abrasives.
3. Wipe again with solvent to remove loose particles.
4. If a primer is used, it should be applied within 4 hours after surface preparation.
Aluminum:
1. Acid Etch: Place panels in the following solution for 10 minutes at 150°F ± 5°F
(66°C ± 2°C).
Sodium Dichromate 4.1 - 4.9 oz./gallon
Sulfuric Acid, 66°Be 38.5 - 41.5 oz./gallon
2024-T3 aluminum (dissolved) 0.2 oz./gallon minimum
Tap Water as needed to balance
2. Rinse: Rinse panels in clear running tap water.
3. Dry: Air dry 15 minutes and force dry 10 minutes at 150°F ± 10°F (66°C ± 5°C).
4. If primer is to be used, it should be applied within 4 hours after surface preparation.
5. Option 2: Degrease with an industrial solvent such as MEK*; abrade with
ScotchBrite™ 7447 abrasive (or sandpaper of approximately 180 grit) and wipe
again with solvent*.
Plastics/Rubber:
1. Wipe with isopropyl alcohol.*
2. Abrade using fine grit abrasives.
3. Wipe with isopropyl alcohol.*
*Note: When using solvents, extinguish all ignition sources and follow the
manufacturer’s precautions and directions for use.
Application Equipment
Suggestions
For small or intermittent applications the 3M™ Scotch-Weld™ EPX™ applicator is
a convenient method of application.
For larger applications these adhesives may be applied by use of flow equipment.
Two-part meter/mixing/dispensing equipment is available for intermittent or
production line use. These systems may be desirable because of their variable shot
size and flow rate characteristics and are adaptable to many applications.
