3
Scotch-WeldTM
Epoxy Potting Compound/A dh esi v e
DP27 0 Clear and Black
Product Description 3MTM Scotch-WeldTM Epoxy Potting Compound/Adhesive DP270 (or 3M™ Scotch-
Weld™ Epoxy Potting Compound/Adhesi ve 270 B/A) is a two-part, low viscosity
epoxy resin system designed primarily for potting, sealing, and encapsulation of
many electronic components and is av ailable in clear or black. Scotch-Weld epoxy
potting compound/adhesi ve DP270 is noncorrosive to copper and offers good
thermal shock resistance and excellent retention of electrical insulation properties
under high humidity conditions.
Scotch-Weld epoxy potting compound/adhesive DP270 has a work life of
approximately 70 minutes, a tack-free time of about 3 hours and is fully cured after
48 hours at 73°F (23°C). This product produces no exotherm in 5-10 gram masses
and a very slight exotherm in larger masses.
Scotch-Weld epoxy potting compound/adhesive DP270 is ideal for the potting and
encapsulation of many heat sensitive or delicate components such as glass diodes
and sensors as well as for transformers, coils, chokes, relays, etc. It is available in
the convenient 3M™ EPX™ Applicator System for multi-station usage and in bulk
containers for larger volume applications.
Available in bulk containers as Scotch-Weld epoxy potting compound/adhesive
270 B/A.
Features • Good Thermal Shock Resistance • Excellent Electrical Properties
• Meets UL 94 HB (File No. E61941) • Noncorrosiv e to Copper
• Long Worklife • Negligible Exotherm
Technical Data December, 2009
Typical Uncured
Properties Note: The follo wing technical information and data should be consider ed representativ e
or typical only and should not be used for specification purposes.
Color: Clear or Black
Base Resin: Epoxy/amine
Mix Ratio: 1:1 by volume (1:0.85 B:A by w eight)
Net Weight: Base 9.6 - 9.8
Lbs./Gal. Accelerator 8.0 - 8.2
Worklife: 60-70 minutes @ 23°C (73°F)
Viscosity: Base 7000 - 16,000 cps
@ 23°C (73°F) Accelerator 6000 - 12,000 cps
3M™Scotch-Weld™
Epoxy P otting Compound/Adhesi ve
D P27 0 Cl ear and Black
Typical Cured
Properties Note: The follo wing technical information and data should be consider ed representativ e
or typical only and should not be used for specification purposes.
Physical:
Color Clear or Black
Refractiv e Index @ 25°C (77°C) Clear 1.656
Cure Shrinkage .08%
Shore D Hardness 83
(ASTM D-2240)
Tack-free Time Appro x. 3 hrs . @ 23°C (73°F)
UL Rating 94 HB (File No. E61941)
Cure Time 48 hrs. @ 23°C (73°F)
Thermal:
W eight Loss b y TGA (in air) 1% @ 122°C (252°F)
5% @ 175°C (347°F)
10% @ 210°C (410°F)
Thermal Coefficient of Expansion by TMA
Below Tg 80 x 10-6 units/unit/°C
5-30°C range (10-86°F range)
Above Tg 180 x 10-6 units/unit/°C
60-125°C range (140-257°F)
Glass Transition Temperature b y DSC
Onset 43°C (109°F)
Mid-Point 49°C (120°F)
Thermal Conductivity
(@ 110°F on .250" samples)
BTU - ft./ft.2- hr. - °F .103
Cal./sec. - cm - °C .426 x 103
Watt/m - °C .177
Thermal Shock Resistance
Potted Washer Olyphant Test Pass 5 Cycles without cracking
3M Test Method C-3174
+100°C (air) to -50°C (liquid)
Electrical:
Dielectric Constant 3.5 @ 1 KHz @ 23°C (73°F)
(ASTM D-150)
Dissipation Factor .018 @ 1 KHz @ 23°C (73°F)
(ASTM D-150)
Dielectric Strength 850 volts/mil
(ASTM D-149)
Volume Resistivity 4.1 x 1014 ohm-cm
(ASTM D-257)
Insulation Resistance
(.8 mm/.8 mm comb pattern on FR-4)
60°C/96% R.H./100 volts d.c.)
Initial 3 x 1013 ohms
1000 hrs. 2 x 1011 ohms
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3M™Scotch-Weld™
Epoxy P otting Compound/Adhesi ve
D P27 0 Cl ear and Black
Additional Electrical
Properties
100Hz 1 KHz 10 KHz 100 KHz 1 MHz
.030
.025
.020
.015
.010
Dissipation Factor
FREQUENCY
Dissipation F actor
Versus Frequency
100Hz 1 KHz 10 KHz 100 KHz 1 MHz
3.8
Dielectric Constant
FREQUENCY
3.6
3.4
3.2
3.0
Dielectric Constant
Versus Frequency
200 400 600 800 1000
11
Log of Resistance (1 x 10 ohms)*
HOURS 12000
12
13
14
15
*The numbers on the vertical axis represent the exponential power on
the 1 x 10 ohm notation.
Insulation Resistance
.8 mm/.8 mm Comb Pattern
60°C (140°F)/95% RH/100 V d.c.
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Note: The following technical information and data should be considered representativ e or
typical only and should not be used for specification purposes.
3M™Scotch-Weld™
Epoxy P otting Compound/Adhesi ve
D P27 0 Cl ear and Black
Typical Cured
Properties (continued) Note: The f ollowing technical information and data should be consider ed representativ e
or typical only and should not be used for specification purposes.
Corrosion:
Per ASTM D-3482
(35°C/95°F/96% R.H./45V d.c./15 days) Pass - No copper corrosion
Per 3M Test Method C-708
(45°C/113°F/96% R.H./250V d.c./5 days) Pass - No copper corrosion
(65°C/149°F/96% R.H./250V d.c./4 days) Pass - No copper corrosion
Per Mil S-46163
(10 da ys/50% R.H./23°C/73°F) Pass - No aluminum, brass or steel
discoloration or corrosion
Solvent Resistance:
(Visual check after immersion in specified solvent at 23°C (73°F)
1 Hour 1 Month
Acetone BC
Isoprop yl Alcohol AB
Freon TF AA
Freon TMC BC
1,1,1-Trichloroethane AC
RMA Flux AB
Key: A- Unaffected
B- Slight Attack
C- Moderate/Severe Attack
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Typical Adhesive
Performance
Characteristics
Note: The following technical information and data should be considered representativ e
or typical only and should not be used for specification purposes.
Although 3M™ Scotch-Weld™ Epoxy Potting Compound/Adhesive DP270 and 270
B/A can be used for many potting and encapsulation applications, the y can also be used
as adhesi ves. The following shows typical shear and peel values determined on several
common substrates:
Overlap Shear Adhesion (ASTM D-1002-72)
Curing Conditions
7 days/73°F (23°C)
Alum./Alum. (etched) @-67°F (-55°C) 1200-1250 psi
@73°F (23°C) 2450-2500 psi
@180°F (82°C) 300-350 psi
FR-4/FR-4 (MEK Wiped) @73°F (23°C) 1750-1800 psi
Copper/Copper (MEK Wiped) @73°F (23°C) 1700-1750 psi
Alum./Alum. (etched) @73°F (23°C) < 2 piw
90° T-Peel Adhesion (ASTM D-1876-61T)
Scotch-W eld epoxy potting compound/adhesiv e @73°F (23°C) 8100 psi
DP270 Clear and Black
Compression Strength (ASTM D-695-68T)
3M™Scotch-Weld™
Epoxy P otting Compound/Adhesi ve
D P27 0 Cl ear and Black
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3M™EPX™
Pneumatic A pplicator
Delivery Rates 6mm Nozzle 10mm Nozzle
Adhesive* gms/minute gms/minute
3M™Scotch-Weld™Epoxy Potting 38.2 148.8
Compound/Adhesive DP270 Black
200 ml A pplicator – Maximum Pr essure 58 psi
1/4 in. Nozzle
Adhesive* gms/minute
3M™Scotch-Weld™Epoxy Potting 75.6
Compound/Adhesive DP270 Clear
Scotch-Weld epoxy potting 68.6
compound/adhesive DP270 Black
50 ml A pplicator – Maximum Pr essure 50 psi
*Tests were run at a temperature of 70°F ± 2°F (21°C ± 1°C) and at maximum applicator pressure.
Handling/Curing
Information Directions f or Use
1. For high strength structural bonds, paint, oxide films, oils, dust, mold release
agents and all other surface contaminants must be completely remo v ed. However,
the amount of surface preparation directly depends on the required bond strength
and the environmental aging resistance desired by user. For specific surf ace
preparations on common substrates, see the section on surface preparation.
2. These products consist of two parts.
Mixing
F or Duo-P ak Cartridges
Scotch-Weld epoxy potting compound/adhesi v e DP270 Clear and Black are
supplied in a dual syringe plastic duo-pak cartridge as part of the 3M™ EPX™
Applicator systems. 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, remov e the duo-pak cartridge cap and e xpel a small amount of
adhesi v e to be sure both sides of the duo-pak cartridge are flowing evenly and
freely. If 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 material and mix thoroughly to obtain a
uniform color.
F or Bulk Containers
Mix thoroughly by weight or volume in the proportions specified in the typical
uncured properties section to obtain a uniform color.
3M™Scotch-Weld™
Epoxy P otting Compound/Adhesi ve
D P27 0 Cl ear and Black
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A pplication and
Equipment Suggestions These products may be applied by spatula, trowel or flo w equipment.
Two part mixing/proportioning/dispensing equipment is a vailable for intermittent or
production line use. These systems are ideal because of their v ariable shot size and
flo w rate characteristics and are adaptable to most applications.
Handling/Curing
Inf ormation (continued) 3. For maximum bond strength apply product evenly to both surf aces to be joined.
4. Application to the substrates should be made within 70 minutes. Larger quantities
and/or higher temperatures will reduce this working time.
5. Join the adhesiv e coated surf aces and allow to cure at 60°F (16°C) or above until
firm. Heat up to 200°F (93°C) will speed curing.
6. The following times and temperatures will result in a full cure of these products.
23°C (73°F) 48 Hours
50°C (122°F) 4 Hours
80°C (176°F) 60 Minutes
100°C (212°F) 30 Minutes
7. Keep parts from mo ving during cure. Contact pressure necessary. Maximum shear
strength is obtained with a 3-5 mil bond line.
8. Excess uncured adhesiv e can be cleaned up with k etone type solv ents*.
*Note: When using solvents, e xtinguish all ignition sources, including pilot lights,
and follo w the manuf acturer’s precautions and directions for use.
Adhesion Coverage: A 0.005 in. thick bondline will yield a co verage of
320 sq. ft./gallon
3M™Scotch-Weld™
Epoxy P otting Compound/Adhesi ve
D P27 0 Cl ear and Black
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Surface Preparation For high strength structural bonds, paint, oxide films, oils, dust, mold release agents
and all other surface contaminants must be completely remo v ed. However, the
amount of surface preparation directly depends on the required bond strength and the
environmental aging resistance desired by user.
The follo wing cleaning methods are suggested for common surf aces:
Steel
1. Wipe free of dust with oil-free solvent such as acetone, isoprop yl or alcohol
solvents.*
2. Sandblast or abrade using clean fine 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 Degrease: 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 - 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 (66°C ± 5°C).
5. If primer is to be used, it should be applied within 4 hours after surface
preparation.
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 allo w the primer to dry 60 minutes
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™
Epoxy P otting Compound/Adhesi ve
D P27 0 Cl ear and Black
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Storage Store product at 60-80°F (16-27°C) for maximum storage life.
Shelf Life These products when stored in original, unopened container have a shelf life of two
years for bulk containers and 15 months in duo-pak containers.
Refer to Product Label and Material Safety Data Sheet for health and safety inf ormation bef ore 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
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
3M , Scotch-Weld and EPX are
trademarks of 3M Company.
Printed in U.S.A.
©3M 2009 78-6900-9677-7 (12/09)
