Scotch-WeldTM Epoxy Adhesive 2216 B/A Technical Data October 2018 Product Description 3MTM Scotch-WeldTM 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. 3MTM Scotch-WeldTM Epoxy Adhesive 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 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.) Brookfield RVF #7 sp. @ 20 rpm 75,000 150,000 40,000 80,000 75,000 150,000 550,000 900,000 11,000 15,000 5,000 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 90 minutes 90 minutes 120 minutes 120 minutes 120 minutes 120 minutes Work Life: 100 g Mass @ 75F (24C) 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. 3MTM Scotch-WeldTM Epoxy Adhesive 2216 B/A Typical Cured Physical Properties 3MTM Scotch-WeldTM Epoxy Adhesive Product 2216 Gray 2216 Tan NS 2216 Translucent Color Gray Tan Translucent Shore D Hardness ASTM D 2240 50-65 65-70 35-50 8-12 hrs. 8-12 hrs. 12-16 hrs. Time to Handling Strength Typical Cured Electrical Properties 3MTM Scotch-WeldTM Epoxy Adhesive Product 2216 Gray Arc Resistance 130 seconds Dielectric Strength 408 volts/mil 630 volts/mil Dielectric Constant @ 73F (23C) 5.51-Measured @ 1.00 KHz 6.3 @ 1 KHz Dielectric Constant @ 140F (60C) 14.17-Measured @ 1.00 KHz -- Dissipation Factor 73F (23C) 0.112 Measured @ 1.00 KHz 0.119 @ 1 KHz 0.422-Measured @ 1.00 KHz -- Surface Resistivity @ 73F (23C) 5.5 x 1016 ohm-@ 500 volts DC -- Volume Resistivity @ 73F (23C) 1.9 x 1012 ohm-cm-@ 500 volts DC 3.0 x 1012 ohm-cm @ 500 volts DC Dissipation Factor 140F (60C) Typical Cured Thermal Properties Typical Cured Outgassing Properties 2216 Translucent Product 3MTM Scotch-WeldTM 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 0-40C 134 x 10-6 in/in/C between 40-80C 81 x 10-6 in/in/C between -50-0C 207 x 10-6 in/in/C between 60-150C Outgassing Data NASA 1124 Revision 4 3MTM Scotch-WeldTM Epoxy Adhesive 2216 Gray % TML % CVCM % Wtr .77 .04 .23 Cured in air for 7 days @ 77F (25C). 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- 3MTM Scotch-WeldTM 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 60F (16C) or above until firm. Heat, up to 200F (93C), will speed curing. 6. The following times and temperatures will result in a full cure: Product Cure Temperature 3MTM Scotch-WeldTM Epoxy Adhesive 2216 Gray 2216 Tan NS 2216 Translucent Time Time Time 75F (24C) 7 days 7 days 30 days 150F (66C) 120 minutes 120 minutes 240 minutes 200F (93C) 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. 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. 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. 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- 3MTM Scotch-WeldTM 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 190F 10F (88C 5C) 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 71C (150 to 160F). 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 71C (150 to 160F). 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 140F (60C) 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 3MTM Scotch-WeldTM Structural Adhesive Primer EC-3901 to the glass surfaces to be bonded and allow the primer to dry a minimum of 30 minutes @ 75F (24C) 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- 3MTM Scotch-WeldTM Epoxy Adhesive 2216 B/A Typical Adhesive Performance Characteristics A. Typical Shear Properties on Etched Aluminum ASTM D 1002 Cure: 2 hours @ 150 5F (66C 2C), 2 psi pressure Overlap Shear (psi) 3MTM Scotch-WeldTM Epoxy Adhesive Test Temperature 2216 B/A Gray Adhesive 2216 B/A Tan NS Adhesive 2216 B/A Trans. Adhesive -423F (-253C) 2440 -- -- -320F (-196C) 2740 -- -- -100F (-73C) 3000 -- -- -67F (-53C) 3000 2000 3000 75F (24C) 3200 2500 1700 180F (82C) 400 400 140 Test Temperature Shear Modulus (Torsion Pendulum Method) -148F (-100C) 398,000 psi (2745 MPa) -76F (-60C) 318,855 psi (2199 MPa) -40F (-40C) 282,315 psi (1947 MPa) 32F (0C) 218,805 psi (1500 MPa) 75F (24C) 49,580 psi (342 MPa) B. Typical T-Peel Strength ASTM D 1876 T-Peel Strength (piw) @ 75F (24C) 3MTM Scotch-WeldTM Epoxy Adhesive Test Temperature 2216 B/A Gray Adhesive 2216 B/A Tan NS Adhesive 2216 B/A Trans. Adhesive 75F (24C) 25 25 25 -5- 3MTM Scotch-WeldTM Epoxy Adhesive 2216 B/A Typical Adhesive Performance Characteristics (continued) C. Overlap Shear Strength After Environmental Aging-Etched Aluminum Overlap Shear (psi) 75F (24C) 3MTM Scotch-WeldTM Epoxy Adhesive Time 2216 B/A Gray Adhesive 2216 B/A Tan NS Adhesive 2216 B/A Trans. Adhesive 100% Relative Humidity @ 120F (49C) 14 days 30 days 90 days 2950 psi 1985 psi 1505 psi 3400 psi 2650 psi 1390 psi *Salt Spray @ 75F (24C) 14 days 30 days 60 days 2300 psi 500 psi 300 psi 3900 psi 3300 psi 1260 psi 14 days 30 days 90 days 3120 psi 2942 psi 2075 psi 3250 psi 2700 psi 1950 psi Air @ 160F (71C) 35 days 4650 psi 4425 psi Air @ 300F (149C) 40 days 4930 psi 4450 psi 3500 psi 7 days 3300 psi 3050 psi 2500 psi Hydraulic Oil @ 75F (24C) 30 days 2500 psi 3500 psi 2500 psi JP-4 Fuel 30 days 2500 psi 2750 psi 2500 psi 7 days 3300 psi 3100 psi 3000 psi Environment Tap Water @ 75F (24C) Anti-icing Fluid @ 75F (24C) Hydrocarbon Fluid *Substrate corrosion resulted in adhesive failure. D. Heat Aging of 3MTM Scotch-WeldTM Epoxy Adhesive 2216 B/A Gray (Cured for 7 days @ 75F [24C]) Overlap Shear (psi) Time aged @ 300F (149C) Test Temperature 0 days 12 days 40 days 51 days -67F (-53C) 2200 3310 3120 2860 75F (24C) 3100 5150 4930 4740 180F (82C) 500 1000 760 1120 350F (177C) 420 440 560 -- -6- 3MTM Scotch-WeldTM Epoxy Adhesive 2216 B/A 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. Overlap Shear (psi) @ 75F (24C) 3MTM Scotch-WeldTM Epoxy Adhesive Substrate Aluminum/Aluminum Cold Rolled Steel/Cold Rolled Steel Stainless Steel/Stainless Steel Galvanized Steel/Galvanized Steel Copper/Copper Brass/Brass Styrene Butadiene Rubber/Steel Neoprene Rubber/Steel ABS/ABS Plastic PVC/PVC, Rigid Polycarbonate/Polycarbonate Acrylic/Acrylic Fiber Reinforced Polyester/ Reinforced Polyester Polyphenylene Oxide/PPO PC/ABS Alloy / PC/ABS Alloy 2216 B/A Gray Adhesive 2216 B/A Tan NS Adhesive 1850 1700 1900 1800 1050 850 200* 220* 990* 940* 1170* 1100* 2350 3100 1730* 1110* 1660* 610 1290 1650* 610 1290 1140* *The substrate failed during the test. Storage Store products at 60-80F (16-27C) 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. -7- 3MTM Scotch-WeldTM Epoxy Adhesive 2216 B/A 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. 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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. (c)3M 2018 E78-6900-9583-7 (2/18) -8-