3
Scotch-WeldTM
Epoxy A dh esive
2216 B/A Gray •2216 B/A Tan NS •2216 B/A T ranslucent
Product Description 3MTM Scotch-WeldTM Epoxy Adhesive 2216 B/A Gray, Tan NS and Translucent are
flexible, two-part, room temperature curing epoxies with high peel and shear strengths.
Advantages • 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.
• 2216 B/A Gray Adhesive meets MIL-A-82720 and DOD-A-82720.
• 2216 B/A Tan NS Adhesive is non-sag for greater bondline control.
• 2216 B/A Translucent can be injected.
Technical Data March, 2002
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 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
Scotch-WeldTM
Epo xy Adhesives
2216 B/A Gray• 2216 B/A Tan NS • 2216 B/A T ranslucent
Typical Cured
Physical Properties Product 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 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 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 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.
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Typical Cured
Outgassing Properties
% TML % CVCM % Wtr
2216 Gray .77 .04 .23
Outgassing Data
NASA 1124 Revision 4
2216 Gray was cured in air for 7 days @ 77°F (25°C).
Scotch-WeldTM
Epo xy Adhesives
2216 B/A Gray• 2216 B/A Tan NS • 2216 B/A T ranslucent
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. Lar ger 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:
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
Product 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
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.
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.
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Scotch-WeldTM
Epo xy Adhesives
2216 B/A Gray• 2216 B/A Tan NS • 2216 B/A T ranslucent
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.
*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.
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Scotch-WeldTM
Epo xy Adhesives
2216 B/A Gray• 2216 B/A Tan NS • 2216 B/A T ranslucent
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)
Test Temperature 2216 B/A Gray 2216 B/A Tan NS 2216 B/A Trans.
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)
Test Temperature 2216 B/A Gray 2216 B/A Tan NS 2216 B/A Trans.
Adhesive Adhesive Adhesive
75°F (24°C) 25 25 25
B. Typical T-Peel Strength
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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Scotch-WeldTM
Epo xy Adhesives
2216 B/A Gray• 2216 B/A Tan NS • 2216 B/A T ranslucent
Overlap Shear (psi) 75°F (24°C)
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 2216 B/A Gray
(Cured for 7 days @ 75°F [24°C])
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*Substrate corrosion resulted in adhesive failure.
Scotch-WeldTM
Epo xy Adhesives
2216 B/A Gray• 2216 B/A Tan NS • 2216 B/A T ranslucent
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.
Overlap Shear (psi)@75°F (24°C)
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 and Shelf Life 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 3M Standard shelf life is two years from date of shipment
from 3M.
Note 2216 B/A is identical to 3M™ Scotch-Weld™ Epoxy Adhesive EC-2216 B/A in
chemical composition. EC-2216 B/A has been labeled, packaged, tested, and
certified for aircraft and aerospace applications. 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.
Scotch-WeldTM
Epo xy Adhesives
2216 B/A Gray• 2216 B/A Tan NS • 2216 B/A T ranslucent
3
Engineered Adhesives Division
3M Center, Building 220-7E-01
St. Paul, MN 55144-1000 Printed in U.S .A.
©3M 2002 78-6900-9583-7 (3/02)
Recycled Paper
40% pr e-consumer
10% post-consumer
To request additional product information or to arrange for sales assistance , call toll free 1-800-362-3550
or visit www.3M.com/adhesives. Address correspondence to: 3M Engineered Adhesives Division, 3M
Center, Building 220-7E-01, St. Paul, MN 55144-1000. Our fax number is 651-733-9175. In Canada,
phone: 1-800-364-3577. In Puerto Rico, phone: 1-787-750-3000. In Mexico, phone: 52-70-04-00.
For Additional
Information
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IMPLIED WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. User is
responsible for determining whether the 3M product is fit f or a particular purpose and suitable for user’s
method of application. Please remember that many factors can affect the use and performance of a 3M
product in a particular application. The materials to be bonded with the product, the surface prepar ation
of those materials, the product selected for use, the conditions in which the product is used, and the time
and environmental conditions in which the product is expected to perform are among the many factors
that can affect the use and performance of a 3M product. Given the variety of factors that can affect the
use and performance of a 3M product, some of which are uniquely within the user’s knowledge and
control, it is essential that the user evaluate the 3M product to determine whether it is fit f or a particular
purpose and suitable for the user’s method of application.
Important Notice
If the 3M product is proved to be defective, THE EXCLUSIVE REMEDY, AT 3M’S OPTION, SHALL BE TO
REFUND THE PURCHASE PRICE OF OR T O REPAIR OR REPLA CE THE DEFECTIVE 3M PRODUCT.
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consequential, regardless of the legal theory asserted, including, but not limited to, contract, negligence,
warranty, or strict liability.
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and Liability
This Engineered Adhesives Division product w as man ufactured under a 3M quality system registered to ISO 9002 standards.
ISO 9002
Refer to Product Label and Material Safety Data Sheet for Health and Safety Inf ormation bef ore using this
product.
Precautionary
Information
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