3
Scotch-WeldTM
Epoxy A dh esi ve
2216 B/A
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. Scotch-Weld epoxy
adhesive 2216 B/A is identical to 3M™ Scotch-Weld™ Epoxy Adhesive EC-2216
B/A in chemical composition. Scotch-Weld epoxy adhesive EC-2216 B/A has been
labeled, packaged, tested, and certified for aircraft and aerospace applications.
Scotch-Weld epoxy adhesive 2216 B/A may be used for aircraft and aerospace
applications if proper Certificates of Test have been issued and material meets all
aircraft manufacturer’s specification requirements.
Features • Excellent for bonding many metals, w oods, plastics, rubbers, and masonry products.
• Base and Accelerator are contrasting colors.
• Good retention of strength after en vironmental aging.
• Resistant to extreme shock, vibration, and flexing.
• Excellent for cryogenic bonding applications.
• The tan NS Adhesiv e is non-sag for greater bondline control.
• The translucent can be injected.
• Meets DOD-A-82720.
Technical Data December, 2009
Typical Uncured
Physical Pr operties Note: The follo wing technical information and data should be considered r epresentativ e
or typical only and should not be used for specification pur poses.
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 Modified Modified Modified Modified Modified
Epoxy Amine Epoxy Amine Epoxy 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.)
Brookfield RVF 75,000 - 40,000 - 75,000 - 550,000 - 11,000 - 5,000 -
#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
3M™Scotch-Weld™
Epo xy Adhesive
2216 B/A
Typical Cured
Physical Pr operties Product 3M™ Scotch-Weld™ Epoxy Adhesive
2216 Gray 2216 Tan NS 2216 Translucent
Color Gray Tan Translucent
Shore D Hardness 50-65 65-70 35-50
ASTM D 2240
Time to Handling Strength 8-12 hrs. 8-12 hrs. 12-16 hrs.
Typical Cured
Electrical Properties 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 —
Surf ace 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
Typical Cured
Thermal Properties Product 3M™ Scotch-Weld™ Epoxy Adhesive
2216 Gray 2216 Translucent
Thermal Conductivity 0.228 Btu-ft/ft2h°F 0.114 Btu-ft/ft2h°F
Coefficient of Thermal 102 x 10-6 in/in/°C 81 x 10-6 in/in/°C
Expansion between 0-40°C between -50-0°C
134 x 10-6 in/in/°C 207 x 10-6 in/in/°C
between 40-80°C between 60-150°C
Handling/Curing
Information Directions for Use
1. For high strength structural bonds, paint, oxide f ilms, oils, dust, mold release agents
and all other surface contaminants must be completely remo v ed. Howev er, 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 follo wing section on surf ace 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.
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Typical Cured
Outgassing Properties
% TML % CVCM % Wtr
3M™ Scotch-Weld™ Epoxy Adhesive 2216 Gray .77 .04 .23
Outgassing Data
NASA 1124 Revision 4
Cured in air for 7 days @ 77°F (25°C).
3M™Scotch-Weld™
Epo xy Adhesive
2216 B/A
Handling/Curing
Inf ormation (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 adhesiv e coated surf aces 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:
7. Keep parts from mo ving 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 adhesiv e can be cleaned up with k etone type solvents.*
Adhesive Co v erage: A 0.005 in. thick bondline will typically yield a cov erage of
320 sq. ft/gallon
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
A pplication and
Equipment Suggestions These products may be applied by spatula, tro wel or flow equipment.
Two-part mixing/proportioning/dispensing equipment is a vailable for intermittent or
production line use. These systems are ideal because of their v ariable shot size and
flo w rate characteristics and are adaptable to man y applications.
Surface Preparation For high strength structural bonds, paint, oxide films, oils, dust, mold release agents
and all other surface contaminants must be completely remo v ed. Howev er, the
amount of surface preparation directly depends on the required bond strength and the
environmental aging resistance desired by user.
The follo wing cleaning methods are suggested for common surf aces.
Steel or Aluminum (Mechanical Abrasion)
1. W ipe 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. W ipe 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.
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3M™Scotch-Weld™
Epo xy 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 lar ge quantities of cold
running water.
2. Optimized FPL Etch Solution (1 liter):
Material Amount
Distilled Water 700 ml plus balance of liter (see belo w)
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). Dissolv e 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. W ipe with isoprop yl alcohol.*
2. Abrade using fine grit abrasives (180 grit or finer).
3. W ipe with isoprop yl 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
Adhesi v e Primer EC-3901 to the glass surf aces 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.
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3M™Scotch-Weld™
Epo xy 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
2216 B/A Gray 2216 B/A Tan NS 2216 B/A Trans.
Test Temperature Adhesive Adhesive 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
T-Peel Strength (piw) @ 75°F (24°C)
3M™ Scotch-Weld™ Epoxy Adhesive
2216 B/A Gray 2216 B/A Tan NS 2216 B/A Trans.
Test Temperature Adhesive Adhesive Adhesive
75°F (24°C) 25 25 25
B. Typical T-Peel Str ength
ASTM D 1876
Shear Modulus
Test Temperature (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)
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3M™Scotch-Weld™
Epo xy Adhesive
2216 B/A
Overlap Shear (psi) 75°F (24°C)
3M™ Scotch-Weld™ Epoxy Adhesive
2216 2216 2216
B/A Gray B/A Tan NS B/A Trans.
Environment Time Adhesive Adhesive Adhesive
100% Relative Humidity 14 days 2950 psi 3400 psi
@120°F (49°C) 30 days 1985 psi 2650 psi 1390 psi
90 days 1505 psi
*Salt Spray@75°F (24°C) 14 days 2300 psi 3900 psi
30 days 500 psi 3300 psi 1260 psi
60 days 300 psi
Tap Water@75°F (24°C) 14 days 3120 psi 3250 psi
30 days 2942 psi 2700 psi 1950 psi
90 days 2075 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 Str ength After Environmental Aging-Etched Aluminum
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 —
D. Heat Aging of 3M™ Scotch-Weld™ Epoxy Adhesive 2216 B/A Gray
(Cured for 7 days @ 75°F [24°C])
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*Substrate corrosion resulted in adhesive failure.
3M™Scotch-Weld™
Epo xy Adhesive
2216 B/A
E. Overlap Shear Str ength on Abraded Metals, Plastics, and Rub bers.
Overlap shear strengths were measured on 1" x 1/2" overlap specimens. These
bonds were made indi vidually using 1" by 4" pieces of substrate (Tested per
ASTM D 1002).
The thickness of the substrates were: cold rolled, galv anized and stainless steel –
0.056-0.062", copper – 0.032", brass – 0.036", rubbers – 0.125", plastics – 0.125".
All surfaces were prepared by solv ent wiping/abrading/ solv ent wiping.
The jaw separation rate used for testing w as 0.1 in/min for metals, 2 in/min for
plastics, and 20 in/min for rubbers.
Overlap Shear (psi)@75°F (24°C)
3M™ Scotch-Weld™ Epoxy Adhesive
Substrate 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 Reinf orced Polyester/
Reinf orced Polyester 1660* 1650*
Polyphenylene Oxide/PPO 610 610
PC/ABS Allo y / PC/ABS Alloy 1290 1290
*The substrate failed during the test.
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Typical Adhesive
Performance
Characteristics
(continued)
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 two years from date of shipment from 3M.
3M™Scotch-Weld™
Epo xy Adhesive
2216 B/A
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Refer to Product Label and Material Safety Data Sheet for health and safety inf ormation bef ore using this
product. For additional health and safety information, call 1-800-364-3577 or (651) 737-6501.
Precautionary
Information
The technical information, recommendations and other statements contained in this document are
based upon tests or experience that 3M believes are reliable, but the accuracy or completeness of such
information is not guaranteed.
Technical Information
Unless an additional warranty is specifically stated on the applicable 3M product packaging or product
literature, 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 OR FITNESS FOR A PARTICULAR PURPOSE OR ANY IMPLIED WARRANTY
OR CONDITION ARISING OUT OF A COURSE OF DEALING, CUSTOM OR USAGE OF TRADE.
If the 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.
Warranty,
Limited Remedy,
and Disclaimer
Except where prohibited by law, 3M will not be liable for any loss or damage arising from the 3M product,
whether direct, indirect, special, incidental or consequential, regardless of the legal theory asserted,
including warranty, contract, negligence or strict liability.
Limitation of Liability
This Industrial Adhesives and Tapes Division product was manufactured under a 3M quality system registered to ISO 9001:2000 standards.
ISO 9001:2000
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. Given the variety of factors that can affect
the use and performance of a 3M product, user is solely responsible for evaluating the 3M product and
determining whether it is fit for a particular purpose and suitable for user’s method of application.
Product Use
Recycled Paper
40% pre-consumer
10% post-consumer
3
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/industrial
3M and Scotch-Weld are trademarks
of 3M Company.
Printed in U.S.A.
©3M 2009 78-6900-9583-7 (12/09)
