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Scotch-Weld
TM
Epoxy Adhesive
DP-4XL
Surface Preparation
For high 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 user.
The following cleaning methods are suggested for common surfaces.
Steel or Aluminum (Mechanical Abrasion)
1. Wipe free of dust with oil-free solvent such as acetone or alcohol solvents.*
2. Sandblast or abrade using clean fine grit abrasives (180 grit or finer).
3. Wipe again with solvents to remove loose particles.
4. If a primer is used, it should be applied within 4 hours after surface preparation.
If 3M? Scotch-Weld? Structural Adhesive Primer EC-1945 B/A is used, apply
a thin coating (0.0005") on the metal surfaces to be bonded, air dry for 10 minutes,
then cure for 30 minutes at 180°F (82°C) prior to 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.
Aluminum (Chemical Etch)
Aluminum alloys may be chemically cleaned and etched as per ASTM D 2651. This
procedure states to:
1. Alkaline Degrease – Oakite 164 solution (9-11 oz/gal of water) at 190°F ± 10°F
(88°C ± 5°C) for 10-20 minutes. Rinse immediately in large quantities of cold
running water.
2. Optimized FPL Etch Solution* (1 liter):
Material
Distilled Water
Sodium Dichromate
Sulfuric Acid
Aluminum Chips
Amount
700 ml plus balance of liter (see below)
28 to 67.3 grams
287.9 to 310.0 grams
1.5 grams/liter of mixed solution
To prepare 1 liter of this solution, dissolve sodium dichromate in 700 ml of
distilled water. Add sulfuric acid and mix well. Add additional distilled water to
fill to 1 liter. Heat mixed solution to 150 to 160°F (66 to 71°C). Dissolve 1.5
grams of 2024 bare aluminum chips per liter of mixed solution. Gentle agitation
will help aluminum dissolve in about 24 hours.
To etch aluminum panels, place them in FPL etch solution heated to 150 to 160°F
(66 to 71°C). Panels should soak for 12 to 15 minutes.
*Note: Review and follow suppliers environmental health and safety
recommendations prior to preparation of this etch solution.
3. Rinse: Rinse panels in clear running tap water.
4. Dry: Air dry 15 minutes; force dry 10 minutes (minimum) at 140°F (60°C)
maximum.
5. If primer is to be used, it should be applied within 4 hours after surface preparation.
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