Scotch-Weld™ Epoxy Adhesive
2216 B/A
Technical Data
Product Description
February 2018
3M™ Scotch-Weld™ Epoxy Adhesive 2216 B/A is a flexible, two-part,
room temperature curing epoxy with high peel and shear strength,
available in three versions. 2216 B/A Gray meets DOD-A-82720.
Note: The following technical information and data should be considered
representative or typical only and should not be used for specification
purposes.
Typical Uncured
Physical
Properties
Product
3M™ Scotch-Weld™ Epoxy Adhesive
2216 B/A Gray
Base
Accelerator
Gray
Modified
Amine
10.5-11.0
40,000 -
80,000
7 parts
3 parts
90 minutes
2216 B/A Tan NS
Base
White
Modified
Epoxy
11.1-11.6
75,000 -
150,000
5 parts
2 parts
120 minutes
Accelerator
Tan
Modified
Amine
10.5-11.0
550,000 -
900,000
7 parts
3 parts
120 minutes
2216 B/A Translucent
Base
Translucent
Modified
Epoxy
9.4-9.8
11,000 -
15,000
1 part
1 part
120 minutes
Accelerator
Amber
Modified
Amine
8.0-8.5
5,000 -
9,000
1 part
1 part
120 minutes
Color:
Base:
Net Wt.: (lb/gal)
Viscosity: (cps) (Approx.)
Brookfield RVF
#7 sp. @ 20 rpm
Mix Ratio: (by weight)
Mix Ratio: (by volume)
Work Life:
100 g Mass @ 75°F (24°C)
White
Modified
Epoxy
11.1-11.6
75,000 -
150,000
5 parts
2 parts
90 minutes
Features
•
Excellent for bonding many metals, woods, plastics, rubbers, and masonry
products.
•
Base and Accelerator are contrasting colors.
•
Good retention of strength after environmental aging.
•
Resistant to extreme shock, vibration, and flexing.
•
Excellent for cryogenic bonding applications.
•
Excellent for potting parts subject to thermal cycling.
•
The tan NS Adhesive is non-sag for greater bond-line control.
•
The translucent can be injected.
•
Meets DOD-A-82720.
3M™ Scotch-Weld™ Epoxy Adhesive
2216 B/A
Typical Cured
Physical Properties
Product
Color
Shore D Hardness
ASTM D 2240
Time to Handling Strength
3M™ Scotch-Weld™ Epoxy Adhesive
2216 Gray
Gray
50-65
8-12 hrs.
2216 Tan NS
Tan
65-70
8-12 hrs.
2216 Translucent
Translucent
35-50
12-16 hrs.
Typical
Cured
Electrical Properties
Product
Arc Resistance
Dielectric Strength
Dielectric Constant @ 73°F (23°C)
Dielectric Constant @ 140°F (60°C)
Dissipation Factor 73°F (23°C)
Dissipation Factor 140°F (60°C)
Surface Resistivity @ 73°F (23°C)
Volume Resistivity @ 73°F (23°C)
3M™ Scotch-Weld™ Epoxy Adhesive
2216 Gray
130 seconds
408 volts/mil
5.51–Measured @ 1.00 KHz
14.17–Measured @ 1.00 KHz
0.112 Measured @ 1.00 KHz
0.422–Measured @ 1.00 KHz
5.5 x 10
16
ohm–@ 500 volts DC
1.9 x 10
12
ohm-cm–@ 500 volts DC
630 volts/mil
6.3 @ 1 KHz
—
0.119 @ 1 KHz
—
—
3.0 x 10
12
ohm-cm
@ 500 volts DC
2216 Translucent
Typical
Cured
Thermal Properties
Product
Thermal Conductivity
Coefficient of Thermal
Expansion
3M™ Scotch-Weld™ Epoxy Adhesive
2216 Gray
0.228 Btu-ft/ ft
2
h °F
102 x 10
-6
in/in/°C
between 0-40°C
134 x 10
-6
in/in/°C
between 40-80°C
2216 Translucent
0.114 Btu-ft/ ft
2
h °F
81 x 10
-6
in/in/°C
between -50-0°C
207 x 10
-6
in/in/°C
between 60-150°C
Typical Cured
Outgassing Properties
Outgassing Data
NASA 1124 Revision 4
% TML
3M™ Scotch-Weld™ Epoxy Adhesive 2216 Gray
Cured in air for 7 days @ 77°F (25°C).
.77
% CVCM
.04
% Wtr
.23
Handling/Curing
Information
Directions for Use
1.
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. For suggested surface preparations of common
substrates, see the following section on surface preparation.
2.
These products consist of two parts. Mix thoroughly by weight or
volume in the proportions specified on the product label and in the
uncured properties section. Mix approximately 15 seconds after a
uniform color is obtained.
-2-
3M™ Scotch-Weld™ Epoxy Adhesive
2216 B/A
Handling/Curing
Information
(continued)
3.
For maximum bond strength, apply product evenly to both surfaces to be
joined.
4.
Application to the substrates should be made within 90 minutes. Larger
quantities and/or higher temperatures will reduce this working time.
5.
Join the adhesive coated surfaces and allow to cure at 60°F (16°C) or
above until firm. Heat, up to 200°F (93°C), will speed curing.
6.
The following times and temperatures will result in a full cure:
Product
Cure Temperature
75°F (24°C)
150°F (66°C)
200°F (93°C)
3M™ Scotch-Weld™ Epoxy Adhesive
2216 Gray
Time
7 days
120 minutes
30 minutes
2216 Tan NS
Time
7 days
120 minutes
30 minutes
2216 Translucent
Time
30 days
240 minutes
60 minutes
7.
Keep parts from moving until handling strength is reached. Contact
pressure is necessary. Maximum shear strength is obtained with a 3-5
mil bond line. Maximum peel strength is obtained with a 17-25 mil
bond line.
8.
Excess uncured adhesive can be cleaned up with ketone type solvents.*
Adhesive Coverage: A 0.005 in. thick bondline will typically yield a
coverage of 320 sq. ft/gallon
Application and
Equipment
Suggestions
These products may be applied by spatula, trowel or flow equipment.
Two-part mixing/proportioning/dispensing equipment is available for
intermittent or production line use. These systems are ideal because of
their variable shot size and flow rate characteristics and are adaptable to
many applications.
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.
*When using solvents, extinguish all ignition sources, including pilot
lights, and follow the manufacturer’s precautions and directions for
use. Use solvents in accordance with local regulations.
-3-
Surface Preparation
3M™ Scotch-Weld™ Epoxy Adhesive
2216 B/A
Surface
Preparation
(continued)
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 66 to 71°C (150 to
160°F). 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 66
to 71°C (150 to 160°F). Panels should soak for 12 to 15 minutes.
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.
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.
*When using solvents, extinguish all ignition sources, including pilot
lights, and follow the manufacturer’s precautions and directions for
use. Use solvents in accordance with local regulations.
-4-
3M™ Scotch-Weld™ Epoxy Adhesive
2216 B/A
Typical
Adhesive
Performance
Characteristics
A.
Typical Shear Properties on Etched Aluminum
ASTM D 1002
Cure: 2 hours @ 150 ± 5°F (66°C ± 2°C), 2 psi pressure
Overlap Shear (psi)
3M™ Scotch-Weld™ Epoxy Adhesive
Test Temperature
-423°F (-253°C)
-320°F (-196°C)
-100°F (-73°C)
-67°F (-53°C)
75°F (24°C)
180°F (82°C)
2216 B/A Gray
Adhesive
2440
2740
3000
3000
3200
400
2216 B/A Tan NS
Adhesive
—
—
—
2000
2500
400
2216 B/A Trans.
Adhesive
—
—
—
3000
1700
140
Test Temperature
-148°F (-100°C)
-76°F (-60°C)
-40°F (-40°C)
32°F (0°C)
75°F (24°C)
Shear Modulus
(Torsion Pendulum Method)
398,000 psi (2745 MPa)
318,855 psi (2199 MPa)
282,315 psi (1947 MPa)
218,805 psi (1500 MPa)
49,580 psi (342 MPa)
B.
Typical T-Peel Strength
ASTM D 1876
T-Peel Strength (piw) @ 75°F (24°C)
3M™ Scotch-Weld™ Epoxy Adhesive
Test Temperature
75°F (24°C)
2216 B/A Gray
Adhesive
25
2216 B/A Tan NS
Adhesive
25
2216 B/A Trans.
Adhesive
25
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