Scotch-WeldTM
Epoxy Adhesives
DP125 Translucent and Gray
Product Description 3M™ Scotch-Weld™ Epoxy Adhesive DP125 Translucent is a faster curing version
of the 3M™ Scotch-Weld™ Epoxy Adhesive 2216 Translucent B/A. The worklife
and cure time has been reduced from hours and days for the Scotch-Weld epoxy
adhesive 2216 Translucent B/A to minutes and hours. Final shear and peel strengths
remain similar or even slightly improved compared to the Scotch-Weld epoxy
adhesive 2216 Translucent.
Scotch-Weld epoxy adhesive DP125 Gray is a filled, pigmented version of the
Scotch-Weld epoxy adhesive DP125 Translucent and has similar performance and
flexibility properties.
Available in bulk containers as 3M™ Scotch-Weld™ Epoxy Adhesive 125 B/A
Translucent and 125 B/A Gray.
Features • 25 minute worklife • High peel and shear strength
• Flexible • Controlled flow (gray)
• Translucent or Gray • 1:1 mix ratio
Typical Uncured
Properties Note: The following technical information and data should be considered representative
or typical only and should not be used for specification purposes.
3M™ Scotch-
Weld™ Epoxy
Adhesive DP125
Translucent
3M™ Scotch-
Weld™ Epoxy
Adhesive
DP125 Gray
Base Resins
Epoxy/Amine
Epoxy/Amine
Viscosity1, Approximate Base (B)
@ 80°F Accelerator (A)
2,000-8,000 cps
22,000-33,000 cps
35,000-75,000 cps
45,000-65,000 cps
Net Weight Base (B)
(Lbs./gal.) Accelerator (A)
9.3-9.7
8.4-8.6
10.3-10.7
8.5-8.9
Color Base (B)
Accelerator (A)
Clear
Amber
Gray
Amber
Mix Ratio (B:A) By Volume
By Weight
1:1
1.10:1
1:1
1.2:1
Worklife2 2 gram
@ 73°F 20 gram
25 min.
18 min.
25 min.
15 min.
Footnotes: Viscosity determined using 3M test method C-1d. Procedure involves Brookfield RVF, #7 spindle, 20 rpm and
80°F. Measurement taken after 1 minute.
1. Worklife determined using 3M test method C-3180. Procedure involves periodically measuring a 2 gram mixed mass for self
leveling and wetting properties. This time will also approximate the usable worklife in an 3M™ EPX Applicator mixing nozzle.
Technical Data March 2019
3M™ Scotch-Weld™
Epoxy Adhesives
DP125 Translucent and Gray
- 2 -
Typical Cured
Properties
Footnotes:
2. Worklife determined using 3M test
method C-3180. Procedure involves
periodically measuring a 2 gram
mixed mass for self leveling and
wetting properties. This time will
also approximate the usable
worklife in an 3M™ EPX
Applicator mixing nozzle.
3. Tack-free time determined per 3M
test method C-3173. Involves
dispensing 0.5 gram amount of
adhesive onto substrate and
testing periodically for no adhesive
transfer to metal spatula.
4. Handling strength determined per
3M test method C-3179. Time to
handling strength taken to be that
required to achieve a 50 psi OLS
strength using aluminum
substrates.
5. The cure time is defined as that
time required for the adhesive to
achieve a minimum of 80% of the
ultimate strength as measured by
aluminum-aluminum OLS.
6. Tensile and Elongation. Used
procedure in 3M test method
C-3094/ATS M D 882. Samples
were 2 in. dumbbells with .0125 in.
neck and .030 in. sample
thickness. Separation rate was 2
inches per minute. Samples cured
2 hrs RT plus 2 hrs/160°F.
7. Weight loss by TGA reported as
that temperature at which 5%
weight loss occurs by TGA in air at
5°C rise per minute per ASTM
1131-86.
8. TCE determined using TMA
Analyzer using a heating rate of
10°C per minute. Second heat
values given.
9. Glass Transition Temperature (Tg)
determined using DSC Analyzer
with a heating rate of 20°C per
minute. Second heat values given.
10. Thermal conductivity determined
using ASTM C177 and C-matic
Instrument using 2 in. diameter
samples.
11. Thermal shock resistance run per
3M test method C-3174. Involves
potting a metal washer into a 2 in.
x 0.5 in. thick section and cycling
this test specimen to colder and
colder temperatures.
Note: The following technical information and data should be considered representative
or typical only and should not be used for specification purposes.
Physical
3M™ Scotch-Weld™
Epoxy Adhesive
DP125 Gray
Color
Gray
Hardness (ASTM D 2240)
Shore D
70
Worklife2
20-30 minutes
Tack-free Time3
2 hrs
Time to Handling Strength4
2.5 hrs
Full Cure Time5
7 days
Elongation6
120%
Tensile Strength6
3300 psi
Thermal
3M™ Scotch-
Weld™ Epoxy
Adhesive DP125
Gray
Weight Loss by Thermal Gravimetric
Analysis (TGA)7
1% @ 176°C
5% @ 303°C
Thermal Coefficient of Expansion (TCE)
by TMA8 ( x 10-6 units/unit/°C)
Below Tg
Above Tg
98 (5-20°C range)
187 (65-140°C range)
Glass Transition Temperature
(Tg) by DCS9
Onset
Mid-Point
12°C
23°C
Thermal Conductivity10
(@ 110°F on .250 in. samples)
BTU - ft./ft.2 - hr. - °F)
Cal./sec. - cm - °C)
Watt/m - °C
.087
.36 x 10-3
.151
Thermal Shock Resistance11
Potted Washer Olyphant Test
(3M Test Method C-3174)
+100°C [air] to -50°C [liquid])
Pass 5 cycles
without cracking
Electrical
3M™ Scotch-
Weld™ Epoxy
Adhesive DP125
Translucent
3M™ Scotch-
Weld™ Epoxy
Adhesive DP125
Gray
Dielectric Constant @ 1 KHZ @ 23°C
(ASTM D 150)
6.3
6.3
Dissipation Factor @ 1 KHZ @ 23°C
(ASTM D 150)
0.14
0.13
Dielectric Strength
(ASTM D 149) Sample Thickness Approx. 30 mil
765 volts/mil
680 volts/mil
Volume Resistivity
(ASTM D 257)
1.2 x 1011 ohm-cm
1.0 x 1011 ohm-cm
3M™ Scotch-Weld™
Epoxy Adhesives
DP125 Translucent and Gray
- 3 -
Typical Adhesive
Performance
Characteristics
Footnotes:
12. Overlap shear (OLS) 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 70°F
except were noted. (Test per ASTM
D 1002-72.)
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.; rubber, 0.125 in.;
plastics, 0.125 in.
The following product performance data was obtained in the 3M laboratory under the
conditions specified. The following data show typical results obtained with the 3M™
Scotch-Weld™ Adhesives when applied to properly prepared substrates, cured, and
tested according to the specifications indicated. The data was generated using the 3M™
EPX Applicator System equipped with an EPX applicator static mixer, according to
manufacturer’s directions. Thorough hand mixing should afford comparable results.
Note: The following technical information and data should be considered representative
or typical only and should not be used for specification purposes.
Overlap Shear Strength (OLS) to12
(Bonds cured 24 hrs @ RT + 2 hrs 160°F)
3M™ Scotch-Weld™
Epoxy Adhesive
DP125 Translucent
3M™ Scotch-Weld™
Epoxy Adhesive
DP125 Gray
Etched Aluminum
2500 psi
3400 psi
Sanded Aluminum (60 grit)
1400 psi
2200 psi
Cold Rolled Steel
1500 psi
1900 psi
Wood, Fir
700 psi
900 psi
Glass, Borosilicate
250 psi
400 psi
Glass,
+3M™ Scotch-Weld™ Primer 3901
200 psi
250 psi
Polycarbonate
700 psi
880 psi
Acrylic
420 psi
550 psi
Fiberglass
1200 psi
1800 psi
ABS
460 psi
520 psi
PVC
500 psi
750 psi
Polypropylene
25 psi
60 psi
Rate of Strength Buildup
(OLS on Etched Aluminum)12
Bonds tested after:
3M™ Scotch-
Weld™ Epoxy
Adhesive DP125
Translucent
3M™ Scotch-
Weld™ Epoxy
Adhesive DP125
Gray
3 hrs @ RT
100 psi
250 psi
6 hrs @ RT
300 psi
500 psi
1 day @ RT
1300 psi
1700 psi
1 wk @ RT
1900 psi
2300 psi
1 mo @ RT
2050 psi
3300 psi
Environmental Aging
(OLS on Etched Aluminum)12
Bonds tested after:
`
3M™ Scotch-
Weld™ Epoxy
Adhesive DP125
Translucent
3M™ Scotch-
Weld™ Epoxy
Adhesive DP125
Gray
24 hrs RT + 2 hrs @ 160°F
2300 psi
4500 psi
24 hrs RT + 2 hrs @ 240°F
3300 psi
5000 psi
1 wk RT + 1 wk @ 90°F/90% RH
2600 psi
3500 psi
1 wk RT + 1 wk 248°F
4600 psi
5400 psi
1 wk RT + 1 wk H2O Immersion
2100 psi
3000 psi
3M™ Scotch-Weld™
Epoxy Adhesives
DP125 Translucent and Gray
- 4 -
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 Shear Strength vs Temperature12
(Bonds cured 24 hr @ RT + 2 hrs @ 160°F)
Bonds tested at
3M™ Scotch-Weld™
Epoxy Adhesive
DP125 Translucent
3M™ Scotch-Weld™
Epoxy Adhesive
DP125 Gray
-67°F
4000 psi
3400 psi
70°F
2500 psi
4300 psi
120°F
400 psi
700 psi
150°F
190 psi
450 psi
180°F
150 psi
400 psi
180° Peel Strength vs Temperature13
(Bonds cured 24 hr @ RT + 2 hrs @ 160°F)
3M™ Scotch-Weld™ Epoxy
Adhesive DP125
Translucent
3M™ Scotch-Weld™ Epoxy
Adhesive DP125
Gray
-67°F
3 piw
3 piw
70°F
35 piw
35 piw
120°F
10 piw
18 piw
150°F
3 piw
3 piw
180°F
2 piw
2 piw
Solvent Resistance14
3M™ Scotch-Weld™ Epoxy
Adhesive DP125
Translucent
3M™ Scotch-Weld™ Epoxy
Adhesive DP125
Gray
One Hour/One Month
One Hour/One Month
Acetone
A/A
A/A
Isopropyl Alcohol
A/A
A/A
Freon TF
A/A
A/A
Freon TMC
A/B
A/B
1,1,1-Trichlorethane
A/A
A/A
RMA Flux
A/A
A/A
Key: A - Unaffected, B - Slight Attack, C - Moderate/Severe Attack
Footnotes:
12. Overlap shear (OLS) 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 70°F except were noted. (Test per ASTM D 1002-72.)
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.; rubber, 0.125 in.; plastics,
0.125 in.
13. T-peel strengths were measured on 1 in. wide bonds at 73°F. The testing jaw separation rate was 20 inches per minute.
The substrates were 0.020 in. thick. (Tests per ASTM D 1876-61T.)
14. Solvent resistance was determined using cured (24 hrs RT + 2 hrs 160°F) samples (1/2 in. x 4 in. x 1/8 in. thickness)
immersed in the test solvent for 1 hour and 1 month. After the allotted period of time the sample was removed and visually
examined for surface attack as compared to the control.
3M™ Scotch-Weld™
Epoxy Adhesives
DP125 Translucent and Gray
- 5 -
3M™ EPX
Pneumatic Applicator
Delivery Rates
48.5/50 ml Applicator – Maximum Pressure 50 psi
Adhesive*
1/4 in. Nozzle
gms/minute
3M™ Scotch-Weld™ Epoxy Adhesive DP125 Translucent
3M™ Scotch-Weld™ Epoxy Adhesive DP125 Gray
63.6
26.4
*Tests were run at a temperature of 70°F ± 2°F (21°C ± 1°C) and at maximum applicator pressure.
Handling/Curing
Information Directions For Use
1. For high strength structural bonds, paints, 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 specific surface preparations
on common substrates, see the section on surface preparation.
2. Use gloves to minimize skin contact. Do not use solvents for cleaning hands.
3. Mixing.
For Duo Pak Cartridges
3M™ Scotch-Weld™ Epoxy Adhesives DP125 Translucent and Gray 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 applicator 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 in the typical
uncured properties section. Mix approximately 15 seconds after uniform color is
obtained.
4. For maximum bond strength, apply adhesive evenly to both surfaces to be joined.
5. Application to the substrates should be made within 20 minutes. Larger quantities
and/or higher temperatures will reduce this working time.
6. Join the adhesive coated surfaces and allow to cure at 60°F (16°C) or above until
completely firm. Heat up to 200°F (93°C), will speed curing. These products will
cure in 7 days @ 75°F (24°C).
7. Keep parts from moving during cure. Contact pressure necessary. Maximum shear
strength is obtained with a 3-5 mil bond line.
8. Excess uncured adhesive can be cleaned up with ketone type solvents.*
*Note: When using solvents, extinguish all ignition sources, including pilot lights, and
follow manufacturer’s precautions and directions for use.
Adhesive Coverage (typical): A 0.005 in. thick bondline will yield a coverage of
320 sq. ft./gallon.
3M™ Scotch-Weld™
Epoxy Adhesives
DP125 Translucent and Gray
- 6 -
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.
The following cleaning methods are suggested for common surfaces:
Steel:
1. Wipe free of dust with oil-free solvent such as acetone, isopropyl or 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
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 .
Sodium Dichromate 4.1 - 4.9 oz./gallon
Sulfuric Acid, 66°Be 38.5 - 41.5 oz./gallon
2024-T3 aluminum (dissolved) 0.2 oz./gallon minimum
Tap water as needed to balance
3. Rinse: Rinse panels in clear running tap water.
4. Dry: Air dry 15 minutes; force dry 10 minutes at 150°F ± 10°F.
5. If primer is to be used, it should be applied within 4 hours after surface preparation.
Note: Read and follow supplier’s environmental, health, and safety documentation for
these chemicals prior to preparation of this solution.
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 primer such as 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 manufacturer’s precautions and directions for use.
Application Equipment
Suggestions For small or intermittent applications the 3M™ EPX Applicator System is a
convenient method of application.
For larger applications these products may be applied by use of flow equipment.
Two part meter/mixing/proportioning/dispensing equipment is available for
intermittent or production line use. These systems may be desirable because of their
variable shot size and flow rate characteristics and are adaptable to many applications.
3M™ Scotch-Weld™
Epoxy Adhesives
DP125 Translucent and Gray
- 7 -
Storage Store products at 60-80°F (16-27°C) for maximum shelf life.
Shelf Life These products have a shelf life of 24 months in their unopened original
containers.
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. No license under any 3M or third party intellectual
property rights is granted or implied with this information.
Product
Selection
and 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. As a result, customer is solely responsible
for evaluating the product and determining whether it is appropriate and suitable for customer’s
application, including conducting a workplace hazard assessment and reviewing all applicable
regulations and standards (e.g., OSHA, ANSI, etc.). Failure to properly evaluate, select, and use a 3M
product and appropriate safety products, or to meet all applicable safety regulations, may result in injury,
sickness, death, and/or harm to property.
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Limited Remedy,
and Disclaimer
Unless a different warranty is specifically stated on the applicable 3M product packaging or product
literature (in which case such warranty governs), 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, FITNESS FOR A PARTICULAR
PURPOSE, OR ARISING OUT OF A COURSE OF DEALING, CUSTOM, OR USAGE OF TRADE. If a
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.
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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.
This Industrial Adhesives and Tapes Division product was manufactured under a 3M quality system registered to ISO 9001: 2000 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.
©3M 2009 78-6900-9866-6 (12/09)