3 scotch-weld tm acrylic adhesives dp805 DP820 product description 3m tm scotch-weld tm 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) non-sag 20 minute worklife (scotch-weld acrylic adhesive DP820) minimal surface preparation 1:1 mix ratio technical data december, 2009 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 scotch-weld acrylic adhesive acrylic adhesive dp805 DP820 color base (b) off-white off-white accelerator (a) yellow yellow net weight base (b) 8.4 8.6 (lbs./gallon) accelerator (a) 8.1 8.1 viscosity 1 base (b) 75,000 cps 70,000 cps @ 73? (23?) accelerator (a) 150,000 cps 45,000 cps base resin acrylic acrylic mix ratio (b:a) by volume 1:1 1:1 by weight 1:1 1:1 worklife 2 nozzle mixed 3-4 minutes 15-20 minutes @ 73? (23?) applied open time 3 3 minutes 15 minutes time to handling strength 4 7-10 minutes 30-40 minutes 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 applicat or. 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?) 23?.
3m scotch-weld acrylic adhesives dp805 ? DP820 - 2 - typical cured properties product 3m scotch-weld 3m scotch-weld acrylic adhesive acrylic adhesive dp805 DP820 color pale yellow pale yellow shore d hardness 5 79 75 full cure time 6 8-24 hrs. @ 73? (23?) 24-48 hrs. @ 73? (23?) elongation 7 30% 50-75% tensile strength 7 3200 psi physical product scotch-weld scotch-weld acrylic adhesive acrylic adhesive dp805 DP820 glass transition temperature 8 (tg) 140? (60?) 136? (58?) coefficient of thermal expansion 9 105 x 10 -6 180 x 10 -6 (units/units/?) 60-212? (20-100?) 68-158? (20-70?) weight loss at temperature 10 1% @ 275? (135?) 1% @ 266? (130?) by thermal gravimetric analysis (tga) 5% @ 451? (233?) 5% @ 446? (230?) thermal product scotch-weld scotch-weld acrylic adhesive acrylic adhesive dp805 DP820 dielectric constant 11 3.6 @ 500 hz 3.1 @ 500 hz 3.6 @ 1 khz 3.0 @ 1 khz 3.5 @ 10 khz 2.8 @ 10 khz 3.4 @ 100 khz 2.8 @ 100 khz dissipation factor 11 0.046 @ 500 hz 0.083 @ 500 hz 0.037 @ 1 khz 0.065 @ 1 khz 0.023 @ 10 khz 0.032 @ 10 khz 0.018 @ 100 khz 0.022 @ 100 khz volume resistivity 12 1.1 x 10 14 ohm-cm 2.2 x 10 12 ohm-cm dielectric strength 13 3500 volts/mil surface resistivity 12 2.1 x 10 15 ohms 1.6 x 10 14 ohms electrical note: the following technical information and data should be considered representative or typical only and should not be used for specification purposes. 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? (20?) per minute. 9. determined using thermal mechanical analysis (tma) and heating rate of 41? (5?) per minute. first heat values given. 10. by tga in air at 50? (10?)/min. tga-7. 11. astm d-150 at 73? (23?). 12. astm d-257 at 73? (23?). 13. astm d-149 at 73? (23?). sample thickness 14 mils.
3m scotch-weld acrylic adhesives dp805 ? DP820 - 3 - typical adhesive performance characteristics product 3m scotch-weld 3m scotch-weld acrylic adhesive acrylic adhesive dp805 DP820 aluminum - etched 3500 3200 aluminum - (etched/oily) 3500 2900 aluminum - (120 grit sandpaper) 3200 3100 aluminum - (solvent cleaned only) 900 300 cold rolled steel (crs) 2800 2500 crs (oily) 2700 2400 copper 900 galvanized steel 1300 1200 fr-4 glass epoxy 2500 2000 fiberglass reinforced plastic 600 700 abs 1000 1000 pvc 1750 1750 polycarbonate 950 1150 acrylic 1200 1250 fir wood 800 1200 overlap shear (ols) 14 to various substrates (psi) product scotch-weld scotch-weld acrylic adhesive acrylic adhesive dp805 DP820 control (no immersion) 2800 2500 toluene 2650 nr * machine oil 2850 1950 ipa (isopropyl alcohol) 2650 1350 gasoline 2750 1500 1,1,1-trichloroethane 2550 nr * 10% hcl 800 nr * mek (methyl ethyl ketone) <10 nr * acetone <10 nr * overlap shear 14 (psi) crs/crs tested after 7 days of immersion in the following product scotch-weld scotch-weld acrylic adhesive acrylic adhesive dp805 DP820 control (rt aging) 2500 2000 248? (120?)/2 wks 2700 3300 194? (90?)/90% rh/2 wks 2600 1600 tap water 1 wk/rt 2200 1500 overlap shear 14 (fr-4/fr-4) tested after environmental exposure (psi) * not recommended (nr) rt = room temperature rh = relative humidity note: the following technical information and data should be considered representative or typical only and should not be used for specification purposes. 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 wer e 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 w ere measured at 73? (23?) except when noted. the separation rate of the testing jaws was 0.1 in. per minute for metals, 2 in. per minute f or 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.
3m scotch-weld acrylic adhesives dp805 ? DP820 - 4 - typical adhesive performance characteristics (continued) product scotch-weld scotch-weld acrylic adhesive acrylic adhesive dp805 DP820 -67? (-55?) 2500 3100 73? (23?) 3500 3150 180? (83?) 2200 1900 200? (93?) 1450 overlap shear 14 (etched alum./etched alum.) tested at various temperatures (psi) product scotch-weld scotch-weld acrylic adhesive acrylic adhesive dp805 DP820 etched alum (oily) 3500 1650 120? (49?)/100% rh/4 wks etched alum 3300 1000 200? (93?)/100% rh/2 wks crs (oily) 2600 1150 120? (49?)/100% rh/2 wks overlap shear 14 of heat/temp. aged oil surfaces (psi) 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 3m scotch-weld acrylic adhesive acrylic adhesive dp805 DP820 control (rt aging) 2800 2500 248? (120?)/2 wks 500 300 194? (90?)/90% rh/2 wks 2200 850 tap water 1 wk/rt 2500 850 overlap shear 14 (crs/crs) tested after environmental exposure (psi) rt = room temperature 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 wer e 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 w ere measured at 73? (23?) except when noted. the separation rate of the testing jaws was 0.1 in. per minute for metals, 2 in. per minute f or 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.
3m scotch-weld acrylic adhesives dp805 ? DP820 - 5 - 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. etched al/etched al ols bond strength scotch-weld scotch-weld time bonding to testing acrylic adhesive dp805 acrylic adhesive DP820 7 minutes 125 15 minutes 1000 30 minutes 2000 40 1 hour 2600 900 2 hours 2800 1700 4 hours 3200 2750 1 day 3500 3400 2 days 3500 3450 7 days 3500 3450 rate of strength build-up ols 14 (psi) peel adhesion 3m scotch-weld 3m scotch-weld acrylic adhesive acrylic adhesive substrate test temperature dp805 DP820 etched al/etched al -67? (-55?) 20 19 etched al/etched al 73? (23?) 35 22 etched al/etched al 100? (38?) 35 22 etched al/etched al 130? (54?) 36 22 etched al/etched al 150? (65?) 35 22 etched al/etched al 180? (83?) 34 22 neoprene/crs 73? (23?) 16 17 11 nitrile/crs 73? (23?) 4 22 red sbr/crs 73? (23?) 17 17 black sbr/crs 73? (23?) 3 9 180 t-peel adhesion 15, 16 (piw) 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 wer e 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 w ere measured at 73? (23?) except when noted. the separation rate of the testing jaws was 0.1 in. per minute for metals, 2 in. per minute f or 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? (23?) substrate 0.020 in. thick. metal/rubber bonds pulled a t 10 in./min. 16. rubber/metal bonds. rubber sanded with 120 grit sandpaper then mek wiped. 17. rubber delamination/tear.
3m scotch-weld acrylic adhesives dp805 ? DP820 - 6 - 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? (16?) or above until completely firm. heat up to 120?-150? (49?-66?) will speed up curing. scotch-weld acrylic adhesive dp805 will fully cure in 8-24 hours @ 73? (23?) and scotch-weld acrylic adhesive DP820 will fully cure in 24-48 hours @ 73? (23?). 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 ?kin?over the exposed surface. if left exposed long enough (2-3 minutes), a thick enough ?kin?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 ?kin?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). note: the data in this technical data sheet were generated using the 3m tm epx tm applicator system equipped with an epx static mixing nozzle, according to manufacturer s directions. thorough hand mixing should offer comparable results.
3m scotch-weld acrylic adhesives dp805 ? DP820 - 7 - 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? 10? (88? 5?) 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? 5? (66? 2?). sodium dichromate 4.1 - 4.9 oz./gallon sulfuric acid, 66?e 38.5 o 41.5 oz./gallon 2024-t3 aluminum (dissolved) 0.2 oz./gallon minimum tap water as needed for balance 3. rinse: rinse panels in clear running tap water. 4. dry: air dry 15 minutes; forced air dry 10 minutes at 190? 10? (88? 5?). 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.
3m scotch-weld acrylic adhesives dp805 ? DP820 storage store product in cool, dry area where temperature is less than 80? (27?). refrigerated storage (40? to 55? [4? to 13?]), 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? (27?), 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? (27?), but less than 120? (49?), are acceptable. when stored in its original unopened cartridges at temperatures below 80? (27?), 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? (27?), but less than 120? (49?), 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. - 8 - 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. 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 stan dards. 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 3m, scotch-weld and epx are trademarks of 3m company. printed in u.s.a. ?m 2009 78-6900-9676-9 (12/09) 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
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