3
Scotch-Weld™
Urethane Adhesive
DP608 Black
Technical Data Sheet July, 2015
Product Description 3M™ Scotch-Weld™ Urethane Adhesive DP608 is a black, rapid setting, two-
component polyurethane. It is packaged as 1:1 ratio liquids in a duo-pak
cartridge. With the squeeze of the trigger, the components are automatically
mixed and easily dispensed as bubble-free controlled-flow liquids. 3M™
Scotch-Weld™ Urethane Adhesive DP608 is used as a horizontal and vertical
grade adhesive for bonding sheet metal structures in lieu of welding.
Features
• Non-sag after dispensing
• 10 minute worklife
• 1:1 Mix Ratio
• Low Temperature Flexibility
Note: The following technical information and data should be considered representative or
typical only and should not be used for specification purposes.
Property
Condition
DP608, Black
Appearance
Part B
Part A
Clear Yellowish
Opaque Black
Mix Ratio (B:A)
By volume
1:1
By weight
1:1
Viscosity1, centipoise
Part B
3000 – 6000 cP
Part A
1500 - 4000 cP
Density, lb/gal
Part B
9.0 – 9.4
8.5-98.
Part A
9.5 – 9.9
Work Life @ 73°F (23°C)
10 g, 1/4" thick,
@ 77°F (25°C)
10 minutes
1Brookfield CP #52 @ 50 rpm, 77°F (25°C)
Note:
The data in this sheet were generated using the 3M™ EPX™ Applicator System equipped with an EPX
static mixer, according to manufacturer’s directions. Thorough hand-mixing will afford comparable results.
Typical
Uncured
Physical
Properties
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™ Scotch-Weld™
Urethane Adhesive
DP608 Black
Note: The following technical information and data should be considered representative or
typical only and should not be used for specification purposes.
Property
Condition
Appearance
Cured
Time to Handling Strength
50 PSI Overlap
shear strength
Hardness After Cure
Elastic Modulus
75°F (24°C)
Temperature Range
Continuous
Exposure
Note: The following technical information and data should be considered representative or
typical only and should not be used for specification purposes.
Aluminum, Overlap Shear, at Temperature (PSI) (ASTM D1002)
Temperature
DP608, Black
-40°F (-40°C)
2900
73°F (23°C)
2800
180°F (82°C) (15 min.)
1
620
1Represents time in test chamber oven before test.
Overlap Shear, Tested @ 73°F (23°C) (PSI) (ASTM D1002)
Product
DP608 Black
Aluminum
MEK/abrade/MEK
2800
Cold Rolled Steel
MEK/abrade/MEK
2330
Nylon
IPA/abrade/IPA
260
Polycarbonate
IPA/abrade/IPA
380
Acrylic
IPA/abrade/IPA
390
SMC
IPA/abrade/IPA
700
Typical Adhesive
Performance
Characteristics
Typical
Cured
Physical
Properties
- 3 -
™ Scotch-Weld™
Urethane Adhesive
DP608 Black
Note: The following technical information and data should be considered representative or
typical only and should not be used for specification purposes.
Overlap Shear, Tested @ 73°F (23°C) (PSI) (ASTM D1002)
Continued
Product
DP608 Black
PVC
MEK/abrade/MEK
550
ABS
MEK/abrade/MEK
550
HIPS
IPA/abrade/IPA
330
Aluminum, Floating Roller Peel, Tested @ 73°F (23°C) (PIW)
(ASTM D3167)
Temperature
DP608 Black
73°F (23°C)
16
Environmental Resistance, Aluminum (etched)
Measured by Overlap Shear Tested @ 73°F (23°C) (PSI) (ASTM D1002)
Environment
Condition
DP608, Black
Room Temperature
73°F (23°C)/50% RH, 30
days
100%
Water Vapor
150°F (66°C)/ 80% RH, 30
days
130%
Water Soak
73°F (23°C) , 30 days
75%
IPA
73°F (23°C), 30 days
immersion
85%
Gasoline
73°F (23°C), 30 days
immersion
85%
A. Overlap Shear (ASTM D1002)
Overlap Shear (ASTM D-1002-64, 3M Test Method C-236) strength was
measured on 1" wide x 1/2" overlap specimen. These bonds were made
individually using 1" x 4" pieces of substrates except for Aluminum. Two
panels 0.063 in. thick, 4 in. x 7y in of 2024T-3 clad aluminum were
bonded and cut into 1 in. wide samples after 24 hours. The thickness of
Substrates and
Testing
Typical Adhesive
Performance
Characteristics
(continued)
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™ Scotch-Weld™
Urethane Adhesive
DP608 Black
the adhesive bond line was approximately 0.005". 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, 0.060 in.; other metals, 0.05-0.064 in.; rubbers,
0.125in.; plastics, 0.125 in. and samples were allowed to cure at 75°F (24°C)
and approximately 50% RH for 1 week before tested. The separation rate of the
testing jaws was 0.1 inch per minute for metals and 2 inches per minute for
plastics.
B. Floating Roller Peel (Bell Peel) (ASTM D3167)
Bell peel strengths were measured on 1 in. wide bonds at the temperatures
noted. The testing jaw separation rate was 6 in. per minute. The bonds were
made with 0.064 in. bonded to 0.025 in. thick adherends.
C. Cure Cycle
All bonds were cured 7 days at 73°F (23°C) at 50% RH before testing or
subjected to further conditioning or environmental aging.
3M™ Scotch-Weld™ Urethane Adhesive DP608 is supplied in dual syringe plastic
duo- pak cartridges as part of the 3M™ EPX™ Applicator System. The duo-pak
cartridges are supplied in 50 ml configuration. To use the EPX cartridge system
simply insert the duo-pak cartridge into the EPX applicator. 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 simultaneous mixing of Part A
and Part B is desired, attach the EPX mixing nozzle to the duo-pak cartridge and
begin dispensing the adhesive.
When mixing Part A and Part B manually the components must be mixed in the
ratio indicated in the typical uncured properties section of this data sheet.
Complete mixing of the two components is required to obtain optimum properties.
Two-part mixing/proportioning/dispensing equipment is available for intermittent
or production line use. These systems are ideal for line uses because of their
variable shot size and flow rate characteristics and are adaptable to most
applications.
Apply adhesive to clean, dry surfaces, joint parts and secure until adhesive sets.
The following surface preparations were used for substrates described in this
Technical Data Sheet.
A. Aluminum Etch
Optimized FPL Etch - 3M (test method C-2803)
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
Handling and
Application
Information
Directions for Use
Surface
Preparation
- 5 -
™ Scotch-Weld™
Urethane Adhesive
DP608 Black
running water (3M test method C-2802).
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).
Dissolve1.5 grams of 2024 bare aluminum chips per liter of mixed solution.
Gentleagitation will help aluminum dissolve in about 24 hours.
To FPL etch panels, place them in the above solution at 150 to 160°F (66 to
71°C) for 12 to 15 minutes.
Note: Review and follow precautionary information provided by chemical
suppliers prior to preparation of this etch solution.
Rinse immediately in large quantities of clear running tap water.
Dry – air dry approximately 15 minutes followed by force dry at 140°F (60°C)
maximum for 10 minutes (minimum).
3. Both surface structure and chemistry play a significant role in determining the
strength and permanence of bonded structures. It is therefore advisable to bond
or prime freshly primed clean surfaces as soon as possible after surface
preparation in order to avoid contamination and/or mechanical damage. Please
contact your 3M sales representative for primer recommendations.
B. Oakite Degrease
Oakite 164 solutions (9-11 oz./gallon of water) at 190°F ± 10°F (88°C ± 5°C) for
2 minutes. Rinse immediately in large quantities of cold running water.
C. MEK/Abrade/MEK
Wipe surface with a methyl ethyl ketone (MEK) soaked swab, abrade and wipe
with a MEK soaked swab.* Allow solvent to evaporate before applying adhesive.
*Note: When using solvents, extinguish all ignition sources, including pilot lights,
and follow the manufacturer’s precautions and directions for use.
D. Isopropyl Alcohol Wipe Only Surface Preparation
Wipe surface with an isopropyl alcohol soaked swab.* Allow solvent to evaporate
before applying adhesive.
*Note: When using solvents, extinguish all ignition sources, including pilot lights,
and follow the manufacturer’s precautions and directions for use.
Surface
Preparation
(Continued)
Surface
Preparation
(Continued)
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™ Scotch-Weld™
Urethane Adhesive
DP608 Black
E. Isopropyl Alcohol/Abrade/Isopropyl Alcohol Surface Preparation
Wipe surface with an isopropyl alcohol soaked swab, abrade using clean fine grit
abrasives, and wipe with an isopropyl alcohol soaked swab.* Then allow solvent
to evaporate before applying adhesive.
*Note: When using solvents, extinguish all ignition sources, including pilot lights,
and follow the manufacturer’s precautions and directions for use.
Surface
Preparation
(Continued)
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™ Scotch-Weld™
Urethane Adhesive
DP608 Black
Storage Store products at 60-80°F (15-27°C) for maximum shelf life.
Shelf Life These products have a shelf life of 12 months from date of manufacture in original duo-pak
containers at room temperature.
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.
ISO 9001: 2008
This Industrial Adhesives and Tapes Division product was manufactured under a 3M quality system registered to ISO 9001: 2008 standard
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, Scotch-Weld and EPX are trademarks of 3M
Company.
©3M 2015.
(E) 78-9236-7081-0