Scotch-Weld™ Epoxy Adhesive
2216 B/A
Technical Data October 2018
Product Description 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.
Typical Uncured
Physical
Properties
Note: The following technical information and data should be considered
representative or typical only and should not be used for specification
purposes.
Product
3M™ Scotch-Weld™ Epoxy Adhesive
2216 B/A Gray
2216 B/A Tan NS
2216 B/A Translucent
Base
Accelerator
Base
Accelerator
Base
Accelerator
Color:
White
Gray
White
Tan
Translucent
Amber
Base:
Modified
Epoxy
Modified
Amine
Modified
Epoxy
Modified
Amine
Modified
Epoxy
Modified
Amine
Net Wt.: (lb/gal)
11.1-11.6
10.5-11.0
11.1-11.6
10.5-11.0
9.4-9.8
8.0-8.5
Viscosity: (cps) (Approx.)
75,000 -
40,000 -
75,000 -
550,000 -
11,000 -
5,000 -
Brookfield RVF
#7 sp. @ 20 rpm
150,000
80,000
150,000
900,000
15,000
9,000
Mix Ratio: (by weight)
5 parts
7 parts
5 parts
7 parts
1 part
1 part
Mix Ratio: (by volume)
2 parts
3 parts
2 parts
3 parts
1 part
1 part
Work Life:
100 g Mass @ 75°F (24°C)
90 minutes
90 minutes
120 minutes
120 minutes
120 minutes
120 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.
- 2 -
Product
3M™ Scotch-Weld™ Epoxy Adhesive
2216 Gray
2216 Tan NS
2216 Translucent
Color
Gray
Tan
Translucent
Shore D Hardness
ASTM D 2240
50-65
65-70
35-50
Time to Handling Strength
8-12 hrs.
8-12 hrs.
12-16 hrs.
Product
3M™ Scotch-Weld™ Epoxy Adhesive
2216 Gray
2216 Translucent
Arc Resistance
130 seconds
Dielectric Strength
408 volts/mil
630 volts/mil
Dielectric Constant @ 73°F (23°C)
5.51–Measured @ 1.00 KHz
6.3 @ 1 KHz
Dielectric Constant @ 140°F (60°C)
14.17–Measured @ 1.00 KHz
—
Dissipation Factor 73°F (23°C)
0.112 Measured @ 1.00 KHz
0.119 @ 1 KHz
Dissipation Factor 140°F (60°C)
0.422–Measured @ 1.00 KHz
—
Surface Resistivity @ 73°F (23°C)
5.5 x 1016 ohm–@ 500 volts DC
—
Volume Resistivity @ 73°F (23°C)
1.9 x 1012 ohm-cm–@ 500 volts DC
3.0 x 1012 ohm-cm
@ 500 volts DC
Product
3M™ Scotch-Weld™ Epoxy Adhesive
2216 Gray
2216 Translucent
Thermal Conductivity
0.228 Btu-ft/ ft2 h °F
0.114 Btu-ft/ ft2 h °F
Coefficient of Thermal
Expansion
102 x 10-6 in/in/°C
between 0-40°C
134 x 10-6 in/in/°C
between 40-80°C
81 x 10-6 in/in/°C
between -50-0°C
207 x 10-6 in/in/°C
between 60-150°C
Typical Cured
Physical Properties
Typical Cured
Electrical Properties
Typical Cured
Thermal Properties
Typical Cured
Outgassing Properties Outgassing Data
NASA 1124 Revision 4
3M™ Scotch-Weld™ Epoxy Adhesive 2216 Gray
% TML
% CVCM
% Wtr
.77
.04
.23
Cured in air for 7 days @ 77°F (25°C).
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.
3M™ Scotch-Weld™ Epoxy Adhesive
2216 B/A
- 3 -
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
3M™ Scotch-Weld™ Epoxy Adhesive
2216 Gray
2216 Tan NS
2216 Translucent
Cure Temperature
Time
Time
Time
75°F (24°C)
7 days
7 days
30 days
150°F (66°C)
120 minutes
120 minutes
240 minutes
200°F (93°C)
30 minutes
30 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.
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.
*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 -
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 Amount
Distilled Water 700 ml plus balance of liter (see below)
Sodium Dichromate 28 to 67.3 grams
Sulfuric Acid 287.9 to 310.0 grams
Aluminum Chips 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.
3M™ Scotch-Weld™ Epoxy Adhesive
2216 B/A
- 5 -
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
Test Temperature
Overlap Shear (psi)
3M™ Scotch-Weld™ Epoxy Adhesive
2216 B/A Gray
Adhesive
2216 B/A Tan NS
Adhesive
2216 B/A Trans.
Adhesive
-423°F (-253°C)
2440
—
—
-320°F (-196°C)
2740
—
—
-100°F (-73°C)
3000
—
—
-67°F (-53°C)
3000
2000
3000
75°F (24°C)
3200
2500
1700
180°F (82°C)
400
400
140
Test Temperature
Shear Modulus
(Torsion Pendulum Method)
-148°F (-100°C)
398,000 psi (2745 MPa)
-76°F (-60°C)
318,855 psi (2199 MPa)
-40°F (-40°C)
282,315 psi (1947 MPa)
32°F (0°C)
218,805 psi (1500 MPa)
75°F (24°C)
49,580 psi (342 MPa)
B. Typical T-Peel Strength
ASTM D 1876
Test Temperature
T-Peel Strength (piw) @ 75°F (24°C)
3M™ Scotch-Weld™ Epoxy Adhesive
2216 B/A Gray
Adhesive
2216 B/A Tan NS
Adhesive
2216 B/A Trans.
Adhesive
75°F (24°C)
25
25
25
- 6 -
Environment
Time
Overlap Shear (psi) 75°F (24°C)
3M™ Scotch-Weld™ Epoxy Adhesive
2216
B/A Gray
Adhesive
2216
B/A Tan NS
Adhesive
2216
B/A Trans.
Adhesive
100% Relative Humidity
@ 120°F (49°C)
14 days
30 days
90 days
2950 psi
1985 psi
1505 psi
3400 psi
2650 psi
1390 psi
*Salt Spray @ 75°F (24°C)
14 days
30 days
60 days
2300 psi
500 psi
300 psi
3900 psi
3300 psi
1260 psi
Tap Water @ 75°F (24°C)
14 days
30 days
90 days
3120 psi
2942 psi
2075 psi
3250 psi
2700 psi
1950 psi
Air @ 160°F (71°C)
35 days
4650 psi
4425 psi
Air @ 300°F (149°C)
40 days
4930 psi
4450 psi
3500 psi
Anti-icing Fluid @ 75°F (24°C)
7 days
3300 psi
3050 psi
2500 psi
Hydraulic Oil @ 75°F (24°C)
30 days
2500 psi
3500 psi
2500 psi
JP-4 Fuel
30 days
2500 psi
2750 psi
2500 psi
Hydrocarbon Fluid
7 days
3300 psi
3100 psi
3000 psi
Typical
Adhesive
Performance
Characteristics
(continued)
C. Overlap Shear Strength After Environmental Aging-Etched Aluminum
*Substrate corrosion resulted in adhesive failure.
D. Heat Aging of 3M™ Scotch-Weld™ Epoxy Adhesive 2216 B/A Gray
(Cured for 7 days @ 75°F [24°C])
Overlap Shear (psi)
Time aged @ 300°F (149°C)
Test Temperature
0 days
12 days
40 days
51 days
-67°F (-53°C)
2200
3310
3120
2860
75°F (24°C)
3100
5150
4930
4740
180°F (82°C)
500
1000
760
1120
350°F (177°C)
420
440
560
—
3M™ Scotch-Weld™ Epoxy Adhesive
2216 B/A
- 7 -
Typical
Adhesive
Performance
Characteristics
(continued)
E. Overlap Shear Strength on Abraded Metals, Plastics, and Rubbers.
Overlap shear strengths were measured on 1" x 1/2" overlap
specimens. These bonds were made individually using 1" by 4" pieces
of substrate (Tested per ASTM D 1002).
The thickness of the substrates were: cold rolled, galvanized and
stainless steel – 0.056-0.062", copper – 0.032", brass – 0.036",
rubbers – 0.125", plastics – 0.125". All surfaces were prepared by solvent
wiping/abrading/ solvent wiping.
The jaw separation rate used for testing was 0.1 in/min for metals, 2
in/min for plastics, and 20 in/min for rubbers.
Substrate
Overlap Shear (psi) @ 75°F (24°C)
3M™ Scotch-Weld™ Epoxy Adhesive
2216 B/A Gray Adhesive
2216 B/A Tan NS Adhesive
Aluminum/Aluminum
1850
2350
Cold Rolled Steel/Cold Rolled Steel
1700
3100
Stainless Steel/Stainless Steel
1900
Galvanized Steel/Galvanized Steel
1800
Copper/Copper
1050
Brass/Brass
850
Styrene Butadiene Rubber/Steel
200*
Neoprene Rubber/Steel
220*
ABS/ABS Plastic
990*
1140*
PVC/PVC, Rigid
940*
Polycarbonate/Polycarbonate
1170*
1730*
Acrylic/Acrylic
1100*
1110*
Fiber Reinforced Polyester/
Reinforced Polyester
1660*
1650*
Polyphenylene Oxide/PPO
610
610
PC/ABS Alloy / PC/ABS Alloy
1290
1290
*The substrate failed during the test.
Storage Store products at 60-80°F (16-27°C) for maximum storage life.
Shelf Life When stored at the recommended temperatures in the original, unopened
containers, the shelf life is 24 months from date of manufacture from 3M.
- 8 -
Precautionary
Information
Refer to Product Label and Material Safety Data Sheet for health and safety information before using
this product. For additional health and safety information, call 1-800-364-3577 or (651) 737-6501.
Technical
Information
The technical information, guidance, and other statements contained in this document or otherwise
provided by 3M are based upon records, tests, or experience that 3M believes to be reliable, but the
accuracy, completeness, and representative nature of such information is not guaranteed. Such
information is intended for people with knowledge and technical skills sufficient to assess and apply
their own informed judgment to the information. No license under any 3M or third party intellectual
property rights is granted or implied with this information.
Product Selection
and Use
Many factors beyond 3M’s control and uniquely within user’s knowledge and control can affect the
use and performance of a 3M product in a particular application. As a result, customer is solely
responsible for evaluating the product and determining whether it is appropriate and suitable for
customer’s application, including conducting a workplace hazard assessment and reviewing all
applicable regulations and standards (e.g., OSHA, ANSI, etc.). Failure to properly evaluate, select,
and use a 3M product and appropriate safety products, or to meet all applicable safety regulations,
may result in injury, sickness, death, and/or harm to property.
Warranty,
Limited
Remedy, and
Disclaimer
Unless a different warranty is specifically stated on the applicable 3M product packaging or product
literature (in which case such warranty governs), 3M warrants that each 3M product meets the
applicable 3M product specification at the time 3M ships the product. 3M MAKES NO OTHER
WARRANTIES OR CONDITIONS, EXPRESS OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, ANY
IMPLIED WARRANTY OR CONDITION OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
PURPOSE, OR ARISING OUT OF A COURSE OF DEALING, CUSTOM, OR USAGE OF TRADE. If a
3M product does not conform to this warranty, then the sole and exclusive remedy is, at 3M’s
option, replacement of the 3M product or refund of the purchase price.
Limitation of Liability Except for the limited remedy stated above, and except to the extent prohibited by law, 3M will not be
liable for any loss or damage arising from or related to the 3M product, whether direct, indirect,
special, incidental, or consequential (including, but not limited to, lost profits or business opportunity),
regardless of the legal or equitable theory asserted, including, but not limited to, warranty, contract,
negligence, or strict liability.
ISO 9001
This Industrial Adhesives and Tapes Division product was manufactured under a 3M quality system registered to ISO 9001 standards.
Industrial Adhesives and Tapes Division
3M Center, Building 225-3S-06
St. Paul, MN 55144-1000
800-362-3550 • 877-369-2923 (Fax)
www.3M.com/structuraladhesives
3M and Scotch-Weld are
trademarks of 3M Company.
Printed in U.S.A.
©3M 2018 E78-6900-9583-7 (2/18)