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Scotch-WeldTM
Acrylic Adhesi ves
D P805 •DP820
Product Description 3MTM 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 adhesiv e DP805) • Non-sag
20 minute worklife (Scotch-Weld acrylic adhesiv e DP820)
• Minimal surface preparation • 1:1 mix ratio
Technical Data December, 2009
Typical Uncured
Physical Pr operties Note: The follo wing technical information and data should be considered r epresentative
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
Viscosity1Base (B) 75,000 cps 70,000 cps
@ 73°F (23°C) Acceler ator (A) 150,000 cps 45,000 cps
Base Resin Acrylic Acrylic
Mix Ratio (B:A) By Volume 1:1 1:1
By W eight 1:1 1:1
Worklife2Nozzle mixed 3-4 minutes 15-20 minutes
@ 73°F (23°C)
Applied Open Time33 minutes 15 minutes
Time to Handling Strength47-10 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 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™
Acryli c Adhesives
DP805• DP820
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Typical Cured
Properties
Product 3M™ Scotch-Weld™ 3M™ Scotch-Weld™
Acrylic Adhesive Acrylic Adhesive
DP805 DP820
Color Pale Yellow Pale Yellow
Shore D Hardness579 75
Full Cure Time68-24 hrs. @ 73°F (23°C) 24-48 hrs. @ 73°F (23°C)
Elongation730% 50-75%
Tensile Strength73200 psi —
Physical
Product Scotch-Weld Scotch-Weld
Acrylic Adhesive Acrylic Adhesive
DP805 DP820
Glass Transition Temperature8(Tg) 140°F (60°C) 136°F (58°C)
Coefficient of Thermal Expansion9105 x 10-6 180 x 10-6
(units/units/°C) 60-212°F (20-100°C) 68-158°F (20-70°C)
W eight Loss at Temperature10 1% @ 275°F (135°C) 1% @ 266°F (130°C)
by Thermal Gra vimetric Anal ysis (TGA) 5% @ 451°F (233°C) 5% @ 446°F (230°C)
Thermal
Product Scotch-Weld Scotch-Weld
Acrylic Adhesive Acrylic Adhesive
DP805 DP820
Dielectric Constant11 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 Factor11 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 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
Electrical
Note: The follo wing technical information and data should be considered r epresentative
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. Separ ation 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.
3M™Scotch-Weld™
Acryli c Adhesives
DP805• DP820
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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 - (solv ent cleaned only) 900 300
Cold Rolled Steel (CRS) 2800 2500
CRS (oily) 2700 2400
Copper 900 —
Galvanized Steel 1300 1200
FR-4 Glass Epo xy 2500 2000
Fiberglass Reinf orced Plastic 600 700
ABS 1000 1000
PVC 1750 1750
Polycarbonate 950 1150
Acrylic 1200 1250
Fir W ood 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 (meth yl ethyl ketone) <10 NR*
Acetone <10 NR*
Overlap Shear14 (psi) CRS/CRS Tested After 7 Days of Immersion in the Follo wing
Product Scotch-Weld Scotch-Weld
Acrylic Adhesive Acrylic Adhesive
DP805 DP820
Control (R T Aging) 2500 2000
248°F (120°C)/2 wks 2700 3300
194°F (90°C)/90% RH/2 wks 2600 1600
Tap W ater 1 wk/RT 2200 1500
Overlap Shear14 (FR-4/FR-4) Tested After Environmental Exposur e (psi)
*Not Recommended (NR)
R T = Room Temperature RH = Relative Humidity
Note: The follo wing technical information and data should be considered r epresentative
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. ov erlap specimens. These bonds w ere
made individually using 1 in. x 4 in. pieces of substrate. The thic kness of the bond line w as 0.005 - 0.008 in. All strengths w ere measured
at 73°F (23°C) except when noted. The separation r ate of the testing jaws was 0.1 in. per minute for metals, 2 in. per min ute 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.
3M™Scotch-Weld™
Acryli c Adhesives
DP805• DP820
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Typical Adhesive
Performance
Characteristics
(continued)
Product Scotch-Weld Scotch-Weld
Acrylic Adhesive Acrylic Adhesive
DP805 DP820
-67°F (-55°C) 2500 3100
73°F (23°C) 3500 3150
180°F (83°C) 2200 1900
200°F (93°C) — 1450
Overlap Shear14 (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°F (49°C)/100% RH/4 wks
Etched Alum 3300 1000
200°F (93°C)/100% RH/2 wks
CRS (Oily) 2600 1150
120°F (49°C)/100% RH/2 wks
Overlap Shear14 of Heat/Temp. Aged Oil Surfaces (psi)
Note: The follo wing technical information and data should be considered r epresentative
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 (R T Aging) 2800 2500
248°F (120°C)/2 wks 500 300
194°F (90°C)/90% RH/2 wks 2200 850
Tap W ater 1 wk/RT 2500 850
Overlap Shear14 (CRS/CRS) Tested After Environmental Exposur e (psi)
R T = 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. ov erlap specimens. These bonds w ere
made individually using 1 in. x 4 in. pieces of substrate. The thic kness of the bond line w as 0.005 - 0.008 in. All strengths w ere measured
at 73°F (23°C) except when noted. The separation r ate of the testing jaws was 0.1 in. per minute for metals, 2 in. per min ute 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.
3M™Scotch-Weld™
Acryli c Adhesives
DP805• DP820
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Typical Adhesive
Performance
Characteristics
(continued)
Note: The follo wing technical information and data should be considered r epresentative
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 da y 3500 3400
2 da ys 3500 3450
7 da ys 3500 3450
Rate of Strength Build-up OLS14 (psi)
P eel Adhesion
3M™ Scotch-Weld™ 3M™ Scotch-Weld™
Acrylic Adhesive Acrylic Adhesive
Substrate Test Temperature DP805 DP820
Etched Al/Etched Al -67°F (-55°C) 20 19
Etched Al/Etched Al 73°F (23°C) 35 22
Etched Al/Etched Al 100°F (38°C) 35 22
Etched Al/Etched Al 130°F (54°C) 36 22
Etched Al/Etched Al 150°F (65°C) 35 22
Etched Al/Etched Al 180°F (83°C) 34 22
Neoprene/CRS 73°F (23°C) 1617 11
Nitrile/CRS 73°F (23°C) 4 22
Red SBR/CRS 73°F (23°C) 1717 –
Black SBR/CRS 73°F (23°C) 3 9
180° T-P eel Adhesion15, 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 were
made individually using 1 in. x 4 in. pieces of substrate. The thic kness 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.
3M™Scotch-Weld™
Acryli c Adhesives
DP805• DP820
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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 adhesi ve
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 adhesi v e DP805 has been applied to a surf ace, it is best to join the tw o
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” ov er the
exposed surf ace. If left exposed long enough (2-3 minutes), a thick enough “skin” may form
which will inhibit the proper wetting needed to achie ve 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 e xhibit 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 3MTM EPXTM Applicator System equipped with
an EPX static mixing nozzle, according to manufacturer’s directions. Thorough hand mixing should offer
comparable results.
3M™Scotch-Weld™
Acryli c Adhesives
DP805• DP820
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Surface Preparation F or high strength structural bonds, paint, oxide films, oils, dust, mold release agents
and all other surface contaminants must be completely remo v ed. The amount of
surface preparation depends on the required bond strength, environmental aging
resistance desired by the user.
The follo wing cleaning methods are suggested for common surf aces:
Steel:
1. Wipe free of dust with oil-free solvents such as acetone or isoprop yl alcohol
solvents.*
2. Sandblast or abrade using clean f ine grit abrasives.
3. Wipe again with solvent to remo ve loose particles.*
4. If a primer is used, it should be applied within 4 hours after surface preparation.
Aluminum:
1. Alkaline De grease: Oakite 164 solution (9-11 oz./gallon w ater) 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 4.1 - 4.9 oz./gallon
Sulfuric Acid, 66°Be 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°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 f ine grit abrasives.
3. Wipe with isopropyl alcohol.*
Glass:
1. Solv ent wipe surf ace 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, e xtinguish all ignition sources, including pilot lights,
and follo w the manuf acturer’s precautions and directions for use.
3M™Scotch-Weld™
Acryli c 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 belo w 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.
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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 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
3M, Scotch-Weld and EPX are trademarks
of 3M Company.
Printed in U.S.A.
©3M 2009 78-6900-9676-9 (12/09)
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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
