3 Scotch-Weld TM Acrylic Adhesives DP805 • DP820 Technical Data December, 2009 Product Description 3M TM Scotch-WeldTM Acrylic Adhesives DP805 and DP820 are two-part, 1:1 mix ratio, toughened acrylic structural adhesives. They exhibit excellent shear and peel strengths along with good impact and durability and bond well to many metals, ceramics, wood and most plastics. Features • Excellent shear and peel strengths • Easy mixing • 5 minute worklife (Scotch-Weld acrylic adhesive DP805) 20 minute worklife (Scotch-Weld acrylic adhesive DP820) • Non-sag • Minimal surface preparation • 1:1 mix ratio 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 Scotch-Weld Acrylic Adhesive DP805 Scotch-Weld Acrylic Adhesive DP820 Color Base (B) Accelerator (A) Off-White Yellow Off-White Yellow Net Weight (Lbs./Gallon) Base (B) Accelerator (A) 8.4 8.1 8.6 8.1 Viscosity1 @ 73°F (23°C) Base (B) Accelerator (A) 75,000 cps 150,000 cps 70,000 cps 45,000 cps Acrylic Acrylic 1:1 1:1 1:1 1:1 3-4 minutes 15-20 minutes 3 minutes 15 minutes 7-10 minutes 30-40 minutes Base Resin Mix Ratio (B:A) By Volume By Weight Worklife2 @ 73°F (23°C) Nozzle mixed Applied Open Time3 Time to Handling Strength4 1. Brookfield RVF #7 spindle at 20 rpm. 2. Approximate time during which material can remain in a mixer nozzle and still be expelled without undue force on the applicator. 3. Approximate time after application of adhesive that bonds can be made without adversely affecting wetting out of adhesive and ultimate performance levels. 4. Time to achieve approx. 50 psi Overlap Shear Strength (OLS) when cured at (73°F) 23°C. 3M™ Scotch-Weld™ Acrylic Adhesives DP805 • DP820 Typical Cured Properties Note: The following technical information and data should be considered representative or typical only and should not be used for specification purposes. Physical Product 3M™ Scotch-Weld™ Acrylic Adhesive DP805 3M™ Scotch-Weld™ Acrylic Adhesive DP820 Pale Yellow Pale Yellow 79 75 8-24 hrs. @ 73°F (23°C) 24-48 hrs. @ 73°F (23°C) 30% 50-75% 3200 psi — Scotch-Weld Acrylic Adhesive DP805 Scotch-Weld Acrylic Adhesive DP820 Glass Transition Temperature8 (Tg) 140°F (60°C) 136°F (58°C) Coefficient of Thermal Expansion9 (units/units/°C) 105 x 10-6 60-212°F (20-100°C) 180 x 10-6 68-158°F (20-70°C) Weight Loss at Temperature10 by Thermal Gravimetric Analysis (TGA) 1% @ 275°F (135°C) 5% @ 451°F (233°C) 1% @ 266°F (130°C) 5% @ 446°F (230°C) Scotch-Weld Acrylic Adhesive DP805 Scotch-Weld Acrylic Adhesive DP820 Dielectric Constant11 3.6 @ 500 Hz 3.6 @ 1 KHz 3.5 @ 10 KHz 3.4 @ 100 KHz 3.1 @ 500 Hz 3.0 @ 1 KHz 2.8 @ 10 KHz 2.8 @ 100 KHz Dissipation Factor11 0.046 @ 500 Hz 0.037 @ 1 KHz 0.023 @ 10 KHz 0.018 @ 100 KHz 0.083 @ 500 Hz 0.065 @ 1 KHz 0.032 @ 10 KHz 0.022 @ 100 KHz Volume Resistivity12 1.1 x 1014 ohm-cm 2.2 x 1012 ohm-cm Dielectric Strength13 — 3500 volts/mil Surface Resistivity12 2.1 x 1015 ohms 1.6 x 1014 ohms Color Shore D Hardness5 Full Cure Time6 7 Elongation 7 Tensile Strength Thermal Product Electrical Product 5. ASTM D-2240. 6. Time to develop 80% of maximum overlap shear values. 7. Tensile and Elongation. Used procedure in 3M Test Method C-3094/ASTM D-882. Samples were 2 in. dumbbells with 0.125 in. neck and .030 in. sample thickness. Separation rate was 2 inches per minute. 8. Determined using DSC and heating rate of 68°F (20°C) per minute. 9. Determined using Thermal Mechanical Analysis (TMA) and heating rate of 41°F (5°C) per minute. First heat values given. 10. By TGA in air at 50°F (10°C)/min. TGA-7. 11. ASTM D-150 at 73°F (23°C). 12. ASTM D-257 at 73°F (23°C). 13. ASTM D-149 at 73°F (23°C). Sample thickness 14 mils. -2- 3M™ Scotch-Weld™ Acrylic Adhesives DP805 • DP820 Typical Adhesive Performance Characteristics Note: The following technical information and data should be considered representative or typical only and should not be used for specification purposes. Overlap Shear (OLS)14 to Various Substrates (psi) Product Aluminum - etched Aluminum - (etched/oily) Aluminum - (120 grit sandpaper) Aluminum - (solvent cleaned only) Cold Rolled Steel (CRS) CRS (oily) Copper Galvanized Steel FR-4 Glass Epoxy Fiberglass Reinforced Plastic ABS PVC Polycarbonate Acrylic Fir Wood 3M™ Scotch-Weld™ Acrylic Adhesive DP805 3M™ Scotch-Weld™ Acrylic Adhesive DP820 3500 3500 3200 900 2800 2700 900 1300 2500 600 1000 1750 950 1200 800 3200 2900 3100 300 2500 2400 — 1200 2000 700 1000 1750 1150 1250 1200 Overlap Shear14 (psi) CRS/CRS Tested After 7 Days of Immersion in the Following Product Control (no immersion) Toluene Machine Oil IPA (isopropyl alcohol) Gasoline 1,1,1-Trichloroethane 10% HCl MEK (methyl ethyl ketone) Acetone Scotch-Weld Acrylic Adhesive DP805 Scotch-Weld Acrylic Adhesive DP820 2800 2650 2850 2650 2750 2550 800 <10 <10 2500 NR* 1950 1350 1500 NR* NR* NR* NR* *Not Recommended (NR) Overlap Shear14 (FR-4/FR-4) Tested After Environmental Exposure (psi) Product Control (RT Aging) 248°F (120°C)/2 wks 194°F (90°C)/90% RH/2 wks Tap Water 1 wk/RT RT = Room Temperature Scotch-Weld Acrylic Adhesive DP805 Scotch-Weld Acrylic Adhesive DP820 2500 2700 2600 2200 2000 3300 1600 1500 RH = Relative Humidity 14. Overlap Shear (ASTM D-1002-64) (3M TM C-236) strengths were measured on 1 in. wide 1/2 in. overlap specimens. These bonds were made individually using 1 in. x 4 in. pieces of substrate. The thickness of the bond line was 0.005 - 0.008 in. All strengths were measured at 73°F (23°C) except when noted. The separation rate of the testing jaws was 0.1 in. per minute for metals, 2 in. per minute for plastics and 20 in. per minute for rubbers. The thickness of the substrates were: steel 0.035 in.; other metals: 0.05-0.064 in.; rubbers, 0.125 in.; plastics, 0.125 in. -3- 3M™ Scotch-Weld™ Acrylic Adhesives DP805 • DP820 Typical Adhesive Performance Characteristics (continued) Note: The following technical information and data should be considered representative or typical only and should not be used for specification purposes. Overlap Shear14 (CRS/CRS) Tested After Environmental Exposure (psi) Product 3M™ Scotch-Weld™ Acrylic Adhesive DP805 3M™ Scotch-Weld™ Acrylic Adhesive DP820 2800 500 2200 2500 2500 300 850 850 Control (RT Aging) 248°F (120°C)/2 wks 194°F (90°C)/90% RH/2 wks Tap Water 1 wk/RT RT = Room Temperature RH = Relative Humidity Overlap Shear14 (Etched Alum./Etched Alum.) Tested at Various Temperatures (psi) Product -67°F (-55°C) 73°F (23°C) 180°F (83°C) 200°F (93°C) Scotch-Weld Acrylic Adhesive DP805 Scotch-Weld Acrylic Adhesive DP820 2500 3500 2200 — 3100 3150 1900 1450 Overlap Shear14 of Heat/Temp. Aged Oil Surfaces (psi) Product Etched Alum (Oily) 120°F (49°C)/100% RH/4 wks Etched Alum 200°F (93°C)/100% RH/2 wks CRS (Oily) 120°F (49°C)/100% RH/2 wks Scotch-Weld Acrylic Adhesive DP805 Scotch-Weld Acrylic Adhesive DP820 3500 1650 3300 1000 2600 1150 14. Overlap Shear (ASTM D-1002-64) (3M TM C-236) strengths were measured on 1 in. wide 1/2 in. overlap specimens. These bonds were made individually using 1 in. x 4 in. pieces of substrate. The thickness of the bond line was 0.005 - 0.008 in. All strengths were measured at 73°F (23°C) except when noted. The separation rate of the testing jaws was 0.1 in. per minute for metals, 2 in. per minute for plastics and 20 in. per minute for rubbers. The thickness of the substrates were: steel 0.035 in.; other metals: 0.05-0.064 in.; rubbers, 0.125 in.; plastics, 0.125 in. -4- 3M™ Scotch-Weld™ Acrylic Adhesives DP805 • DP820 Typical Adhesive Performance Characteristics (continued) Note: The following technical information and data should be considered representative or typical only and should not be used for specification purposes. 180° T-Peel Adhesion15, 16 (piw) Peel Adhesion Substrate Test Temperature Etched Al/Etched Al Etched Al/Etched Al Etched Al/Etched Al Etched Al/Etched Al Etched Al/Etched Al Etched Al/Etched Al Neoprene/CRS Nitrile/CRS Red SBR/CRS Black SBR/CRS 3M™ Scotch-Weld™ 3M™ Scotch-Weld™ Acrylic Adhesive Acrylic Adhesive DP805 DP820 -67°F (-55°C) 73°F (23°C) 100°F (38°C) 130°F (54°C) 150°F (65°C) 180°F (83°C) 73°F (23°C) 73°F (23°C) 73°F (23°C) 73°F (23°C) 20 35 35 36 35 34 1617 4 1717 3 19 22 22 22 22 22 11 22 – 9 Rate of Strength Build-up OLS14 (psi) Etched Al/Etched Al OLS Bond Strength Time Bonding to Testing Scotch-Weld Acrylic Adhesive DP805 Scotch-Weld Acrylic Adhesive DP820 7 minutes 15 minutes 30 minutes 1 hour 2 hours 4 hours 1 day 2 days 7 days 125 1000 2000 2600 2800 3200 3500 3500 3500 — — 40 900 1700 2750 3400 3450 3450 14. Overlap Shear (ASTM D-1002-64) (3M TM C-236) strengths were measured on 1 in. wide 1/2 in. overlap specimens. These bonds were made individually using 1 in. x 4 in. pieces of substrate. The thickness of the bond line was 0.005 - 0.008 in. All strengths were measured at 73°F (23°C) except when noted. The separation rate of the testing jaws was 0.1 in. per minute for metals, 2 in. per minute for plastics and 20 in. per minute for rubbers. The thickness of the substrates were: steel 0.035 in.; other metals: 0.05-0.064 in.; rubbers, 0.125 in.; plastics, 0.125 in. 15. Metal/metal bonds tested per 3M TM C-439 @ 20 in./min. at 73°F (23°C) substrate 0.020 in. thick. Metal/rubber bonds pulled at 10 in./min. 16. Rubber/metal bonds. Rubber sanded with 120 grit sandpaper then MEK wiped. 17. Rubber delamination/tear. -5- 3M™ Scotch-Weld™ Acrylic Adhesives DP805 • DP820 Note: The data in this technical data sheet were generated using the 3MTM EPXTM Applicator System equipped with an EPX static mixing nozzle, according to manufacturer’s directions. Thorough hand mixing should offer comparable results. 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. The amount of surface preparation depends on the required bond strength, environmental aging resistance desired by user. For suggested surface preparations on common substrates, see the section on surface preparation. 2. Mixing For Duo-Pak Cartridges 3M™ Scotch-Weld™ Acrylic Adhesives DP805 and DP820 are supplied in a dual syringe plastic duo-pak cartridge as part of the 3M™ EPX™ Applicator System. To use, simply insert the duo-pak cartridge into the EPX applicator and start the plunger into the cylinders using light pressure on the trigger. Next, remove the duo-pak cartridge cap and expel a small amount of adhesive to be sure both sides of the duo-pak cartridge are flowing evenly and freely. If automatic mixing of Part A and Part B is desired, attach the EPX mixing nozzle to the duo-pak cartridge and begin dispensing the adhesive. For hand mixing, expel the desired amount of adhesive and mix thoroughly. Mix approximately 15 seconds after uniform color is obtained. For Bulk Containers Mix thoroughly by weight or volume in the proportions specified on the product label or in the typical uncured properties section. Mix approximately 15 seconds after uniform color is obtained. 3. For maximum bond strength, apply adhesive evenly to both surfaces to be joined. 4. Application to the substrates should be made within 2 minutes for Scotch-Weld acrylic adhesive DP805 or 15 minutes for Scotch-Weld acrylic adhesive DP820. 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 completely firm. Heat up to 120°F-150°F (49°C-66°C) will speed up curing. Scotch-Weld acrylic adhesive DP805 will fully cure in 8-24 hours @ 73°F (23°C) and Scotch-Weld acrylic adhesive DP820 will fully cure in 24-48 hours @ 73°F (23°C). 6. Keep parts from moving during cure. Contact pressure necessary. Maximum shear strength is obtained with a 3-5 mil bond line. 7. Excess uncured adhesive can be cleaned up with ketone type solvents.* 8. Once Scotch-Weld acrylic adhesive DP805 has been applied to a surface, it is best to join the two mating surfaces together as soon as possible. The reason for this is that after approximately one minute Scotch-Weld acrylic adhesive DP805 may begin to form a very thin “skin” over the exposed surface. If left exposed long enough (2-3 minutes), a thick enough “skin” may form which will inhibit the proper wetting needed to achieve maximum performance. In instances where an extended exposed open time is required, it is still possible to achieve excellent bonds by coating both substrates to be joined and making the bond in such a manner as to rupture the “skin” surface. Scotch-Weld acrylic adhesive DP820 does not exhibit this skinning characteristic. *Note: When using solvents, extinguish all ignition sources, including pilot lights, and follow the manufacturer’s precautions and directions for use. Adhesive Coverage: A 0.005 in. thick bondline will yield a coverage of 320 sq. ft./gallon (typical). -6- 3M™ Scotch-Weld™ Acrylic Adhesives DP805 • DP820 Surface Preparation For high strength structural bonds, paint, oxide films, oils, dust, mold release agents and all other surface contaminants must be completely removed. The amount of surface preparation depends on the required bond strength, environmental aging resistance desired by the user. The following cleaning methods are suggested for common surfaces: Steel: 1. Wipe free of dust with oil-free solvents such as acetone or isopropyl alcohol solvents.* 2. Sandblast or abrade using clean fine grit abrasives. 3. Wipe again with solvent to remove loose particles.* 4. If a primer is used, it should be applied within 4 hours after surface preparation. Aluminum: 1. Alkaline Degrease: Oakite 164 solution (9-11 oz./gallon water) at 190°F ± 10°F (88°C ± 5°C) for 10-20 minutes. Rinse immediately in large quantities of cold running water. 2. Acid Etch: Place panels in the following solution for 10 minutes at 150°F ± 5°F (66°C ± 2°C). Sodium Dichromate Sulfuric Acid, 66°Be 2024-T3 aluminum (dissolved) Tap water as needed for balance 4.1 - 4.9 oz./gallon 38.5 o 41.5 oz./gallon 0.2 oz./gallon minimum 3. Rinse: Rinse panels in clear running tap water. 4. Dry: Air dry 15 minutes; forced air dry 10 minutes at 190°F ± 10°F (88°C ± 5°C). 5. If primer is to be used, it should be applied within 4 hours after surface preparation (or see instruction pertaining to a specific primer). Plastics/Rubber: 1. Wipe with isopropyl alcohol.* 2. Abrade using fine grit abrasives. 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™ Metal Primer EC3901 to the glass surfaces to be bonded and allow the primer to dry before bonding. *Note: When using solvents, extinguish all ignition sources, including pilot lights, and follow the manufacturer’s precautions and directions for use. -7- 3M™ Scotch-Weld™ Acrylic Adhesives DP805 • DP820 Storage Store product in cool, dry area where temperature is less than 80°F (27°C). Refrigerated storage (40°F to 55°F [4°C to 13°C]), but not frozen, is recommended to extend the shelf life of the products further. Shelf Life When stored in its original unopened cartridges at temperatures below 80°F (27°C), 3M™ Scotch-Weld™ Acrylic Adhesive DP805 has a shelf life of nine months from the date of shipment from 3M. Within this time period, short term exposure (less than two weeks) to temperatures greater than 80°F (27°C), but less than 120°F (49°C), are acceptable. When stored in its original unopened cartridges at temperatures below 80°F (27°C), 3M™ Scotch-Weld™ Acrylic Adhesive DP820 has a shelf life of six months from the date of shipment from 3M. Within this time period, short term exposure (less than two weeks) to temperatures greater than 80°F (27°C), but less than 120°F (49°C), are acceptable. If product handling does not meet these conditions then a visual inspection of the product during dispensing is recommended. Any appearance of gels in the mixing nozzle or abnormally high viscosity that makes adhesive delivery difficult indicates that the product should not be used. 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, 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. Product 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. 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. Warranty, Limited Remedy, and Disclaimer 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. Limitation of Liability 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. 3 This Industrial Adhesives and Tapes Division product was manufactured under a 3M quality system registered to ISO 9001: 2000 standards. ISO 9001: 2000 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 Recycled Paper 40% pre-consumer 10% post-consumer -8- 3M, Scotch-Weld and EPX are trademarks of 3M Company. Printed in U.S.A. ©3M 2009 78-6900-9676-9 (12/09)