DP-270 BLACK 400ML - 3M Electronic Specialty

Scotch-WeldTM

Epoxy Potting Compound/Adhesive

DP270 Clear and Black

Technical Data March, 2015

Product Description 3MTM Scotch-WeldTM Epoxy Potting Compound/Adhesive DP270 (or 3M™ Scotch-

Weld™ Epoxy Potting Compound/Adhesive 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 available in clear or black. Scotch-Weld epoxy

potting compound/adhesive DP270 is noncorrosive to copper and offers good

thermal shock resistance and excellent retention of electrical insulation properties

under high humidity conditions.

3M™ 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.

3M™ 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) • Noncorrosive to Copper

• Long Worklife • Negligible Exotherm

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.

Color:

Clear or Black

Base Resin:

Epoxy/amine

Mix Ratio:

1:1 by volume (1:0.85 B:A by weight)

Net Weight:

Lbs./Gal.

Base 9.6 - 9.7

Accelerator 8.0 - 8.2

Worklife:

60-70 minutes @ 23°C (73°F)

Viscosity:

@ 23°C (73°F)

Base 7000 - 16,000 cps

Accelerator 6000 - 12,000 cps

3M™ Scotch-Weld™

Epoxy Potting Compound/Adhesive

DP270 Clear and Black

- 2 -

Typical Cured

Properties Note: The following technical information and data should be considered representative

or typical only and should not be used for specification purposes.

Physical:

Color

Refractive Index @ 25°C (77°C)

Cure Shrinkage

Shore D Hardness

(ASTM D-2240)

Tack-free Time

UL Rating

Cure Time

Clear or Black

Clear 1.656

.08%

Approx. 3 hrs. @ 23°C (73°F)

94 HB (File No. E61941)

48 hrs. @ 23°C (73°F)

Thermal:

Weight Loss by TGA (in air)

Thermal Coefficient of Expansion by TMA

Below Tg

Above Tg

Glass Transition Temperature by DSC

Onset

Mid-Point

Thermal Conductivity

(@ 110°F on .250" samples)

BTU - ft./ft.2 - hr. - °F

Cal./sec. - cm - °C

Watt/m - °C

Thermal Shock Resistance

Potted Washer Olyphant Test

3M Test Method C-3174

+100°C (air) to -50°C (liquid)

1% @ 122°C (252°F)

5% @ 175°C (347°F)

10% @ 210°C (410°F)

80 x 10-6 units/unit/°C

5-30°C range (10-86°F range)

180 x 10-6 units/unit/°C

60-125°C range (140-257°F)

43°C (109°F)

49°C (120°F)

.103

.426 x 103

.177

Pass 5 Cycles without cracking

Electrical:

Dielectric Constant

(ASTM D-150)

Dissipation Factor

(ASTM D-150)

Dielectric Strength

(ASTM D-149)

Volume Resistivity

(ASTM D-257)

Insulation Resistance

(.8 mm/.8 mm comb pattern on FR-4)

60°C/96% R.H./100 volts d.c.)

Initial

1000 hrs.

3.5 @ 1 KHz @ 23°C (73°F)

.018 @ 1 KHz @ 23°C (73°F)

850 volts/mil

4.1 x 1014 ohm-cm

3 x 1013 ohms

2 x 1011 ohms

3M™ Scotch-Weld™

Epoxy Potting Compound/Adhesive

DP270 Clear and Black

- 3 -

Dissipation Factor

Log of Resistance (1 x 10 ohms)*

Dielectric Constant

Additional Electrical

Properties Note: The following technical information and data should be considered representative or

typical only and should not be used for specification purposes.

Dissipation Factor

Versus Frequency Dielectric Constant

Versus Frequency

.030

.025

.020

.015

3.8

3.6

3.4

3.2

.010

100Hz 1 KHz 10 KHz 100 KHz 1 MHz

FREQUENCY

3.0

100Hz 1 KHz 10 KHz 100 KHz 1 MHz

FREQUENCY

Insulation Resistance

.8 mm/.8 mm Comb Pattern

60°C (140°F)/95% RH/100 V d.c.

11 0 200 400 600 800 1000

HOURS

1200

*The numbers on the vertical axis represent the exponential power on

the 1 x 10 ohm notation.

3M™ Scotch-Weld™

Epoxy Potting Compound/Adhesive

DP270 Clear and Black

- 4 -

Typical Cured

Properties (continued) Note: The following technical information and data should be considered representative

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 days/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)

Acetone

1 Hour

1 Month

Isopropyl Alcohol

Freon TF

Freon TMC

1,1,1-Trichloroethane

RMA Flux

Key: A - Unaffected

B - Slight Attack

C - Moderate/Severe Attack

Typical Adhesive

Performance

Characteristics

Note: The following technical information and data should be considered representative

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, they can also be used

as adhesives. 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)

@73°F (23°C)

@180°F (82°C)

1200-1250 psi

2450-2500 psi

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

90° T-Peel Adhesion (ASTM D-1876-61T)

Alum. /Alum. (etched)

@73°F (23°C)

< 2 piw

Compression Strength (ASTM D-695-68T)

Scotch-Weld epoxy potting compound/adhesive

DP270 Clear and Black

@73°F (23°C)

8100 psi

3M™ Scotch-Weld™

Epoxy Potting Compound/Adhesive

DP270 Clear and Black

- 5 -

Adhesive*

6mm Nozzle

gms/minute

10mm Nozzle

gms/minute

3M™ Scotch-Weld™ Epoxy Potting

Compound/Adhesive DP270 Black

38.2

148.8

3M™ EPX™

Pneumatic Applicator

Delivery Rates

200 ml Applicator – Maximum Pressure 58 psi

50 ml Applicator – Maximum Pressure 50 psi

Adhesive*

1/4 in. Nozzle

gms/minute

3M™ Scotch-Weld™ Epoxy Potting

Compound/Adhesive DP270 Clear

Scotch-Weld epoxy potting

compound/adhesive DP270 Black

75.6

68.6

*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, 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. For specific surface

preparations on common substrates, see the section on surface preparation.

2. These products consist of two parts.

Mixing

For Duo-Pak Cartridges

3M™ Scotch-Weld™ epoxy potting compound/adhesive 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, 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 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.

For 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 Potting Compound/Adhesive

DP270 Clear and Black

- 6 -

Handling/Curing

Information (continued) 3. For maximum bond strength apply product evenly to both surfaces 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 adhesive coated surfaces 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 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 the manufacturer’s precautions and directions for use.

Adhesion Coverage: A 0.005 in. thick bondline will yield a coverage of

320 sq. ft./gallon

Application and

Equipment Suggestions These products may be applied by spatula, trowel or flow equipment.

Two part mixing/proportioning/dispensing equipment is available for intermittent or

production line use. These systems are ideal because of their variable shot size and

flow rate characteristics and are adaptable to most applications.

3M™ Scotch-Weld™

Epoxy Potting Compound/Adhesive

DP270 Clear and Black

- 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. 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

(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 allow 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 Potting Compound/Adhesive

DP270 Clear and Black

- 8 -

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.

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, 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: 2000

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, Scotch-Weld and EPX are

trademarks of 3M Company.

Mouser Electronics

Authorized Distributor

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