3M™ Thermally Conductive Epoxy Adhesive TC-2707
Product Description
3M™ Thermally Conductive Epoxy Adhesive TC-2707 is a thermally conductive 2-part epoxy using aluminum metal
fillers for good thermal conductivity with high adhesion.
Technical Data August 2014
Features and Benefits
• High adhesive strength
• Good surface wet out
• Low viscosity for potting application
• Good gap filling
• Thin bonding line
• Good thermal conductivity (0.72 W/m-K)
• Low Cl ion content and outgassing
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.
Product 3M™ Thermally Conductive Epoxy Adhesive TC-2707
Viscosity Base 170,000 cps
Accelerator 25,000 cps
Mixed 100,000 cps
Base Resin Base Epoxy
Accelerator Amine
Filler Aluminum 50% by weight
Mix Ratio Volume 2:1
(B:A) Weight 2.00 : 0.96
Worklife 60 minutes at 23°C (72°F)
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.
Product 3M™ Thermally Conductive Epoxy Adhesive TC-2707
Color Gray
Shore D Hardness 84
Glass Transition Temperature 60°C (tan delta) See Chart on page 3
Thermal Coefficient of Expansion 56 x 10-6/°C (below Tg)
132 x 10-6/°C (above Tg)
Thermal Conductivity 0.72 W/m-°K
Thermal Impedance 3.51 x 10-5 m°K/W (1 mil)
Volume Resistivity1 1.6 x 1011 ohm-cm
Total Outgassing <25 micro-gm/gm (GC/MS, 85°C/3 hours)
Hydrocarbon Outgassing <25 micro-gm/gm (GC/MS, 85°C/3 hours)
Siloxane Outgassing <5 micro-gm/gm (GC/MS, 85°C/3 hours)
Extractable Chloride <30 micro-gm/gm (hexane extraction)
1
As the 3M™ Thermally Conductive Epoxy Adhesive TC-2707 uses aluminum metal fillers, under certain end use application conditions the effective
resistivity and/or effective dielectric strength could be significantly lower than noted. If the metal fillers are “trapped” or “pinched” between two surfaces,
an electrical bridge path via the aluminum fillers could occur between these surfaces. Epoxy Adhesive TC-2707 is not suggested for applications where a
powered electrical circuit is used or where a reliable volume resistivity and/or dielectric strength is desired. 3M™ Thermally Conductive Epoxy Adhesive
TC-2810 uses a ceramic filler and is a suggested product to test for these type of application performance needs.
(2)
3M™ Thermally Conductive Epoxy Adhesive TC-2707
Curing
Cure Schedule: 23°C / 24 hours
50°C / 270 minutes
70°C / 90 minutes
90°C / 30 minutes
120°C / 10 minutes
Note: The following technical information and data should be considered representative or typical only, and should not
be used for specification purposes.
Shear Strength, Peel Strength, Tg vs. Cure Temperature/Time
23°C 50°C 70°C 90°C 120°C
(72°F) (122°F) (158°F) (194°F) (248°F)
24 hours 270 minutes 90 minutes 30 minutes 10 minutes
Overlap Shear (psi) >2700 >2700 >2700 >2700 >2700
(ASTM D-1002)
T-Peel (piw) >7 >7 >7 >7 >7
(ASTM D-1876)
Tg (°C) 60 83 95 100 100
Tan Delta
Tg (°C) 48 73 85 86 89
Storage Modulus
1600
1400
1200
1000
800
600
400
200
0
20 40 60 80 100 120 140
160
140
120
100
80
60
40
20
0
Cure Time (Minutes)
Tg (°C)
Cure Temperature (°C)
Cure Time
(minutes)
Tg (°C)
Time to Reach Maximum Tg (°C) for 3M™ Thermally Conductive Epoxy Adhesive TC-2707
Cured using Various Conditions
(3)
3M™ Thermally Conductive Epoxy Adhesive TC-2707
Application and Product Use Notes
For bonding rigid to rigid parts it is suggested that the bond line thickness and edge fillet be designed to optimize:
i) Bond Strength;
ii) Thermal Resistance.
A typical suggested bond line is in the 3-7 mil thickness range
For improved thermal performance (lower Thermal Resistance), a thinner bond line is suggested. A thinner bond line can
reduce the bond strength so each application needs to be tested to find the correct balance between:
“Bond Line Thickness vs. Thermal Resistance vs. Bond Strength”
A “fillet” at the edges of a bond line is suggested to increase bond strength. The fillets are formed as the epoxy squeezes
out past the side edges. Fillets can add strength to the assembly.
3M™ Thermally Conductive Epoxy TC-2707 is supplied in dual syringe plastic duo-pak cartridges as part of the 3M™
EPX™ Applicator System. The duo-pak cartridges are supplied in a 37 ml configuration. To use the 37 ml cartridge 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 and discard a small amount of adhesive to be sure both sides
of the duo-pak cartridge are flowing evenly and freely (ie: no voids, “plugs of adhesive”, dis-continuity in flow, etc.) Once
even side to side and uniform flow from both sides of the duo-pak is confirmed, attach the 3M™ EPX™ Mixing Nozzle to
the duo-pak cartridge to ensure proper and uniform mixing of the Part A and Part B and begin dispensing the adhesive.
With a 200mil cartridge, the nozzle must be attached before dispensing any material to prevent unmixed adhesive
from getting into the applicator cartridge holder. A quantity of material should be dispensed through the mix nozzle and
discarded until a uniform color, consistency of product, freely flowing and even side to side flow is evident.
Partially used cartridges must follow the above use instructions to ensure consistent product performance.
Complete and uniform mixing as noted above of the two components is required to obtain consistent product performance.
(4)
3M™ EPX™ Applicator and Mix Nozzles
Use only 3M™ EPX™ Applicator and Mix Nozzles to ensure optimum product performance.
Sturdy 3M™ EPX™
Applicators
Mix Nozzle
Epoxy duo-pac
EPX Plunger
EPX Applicator
3M™ Thermally Conductive Epoxy Adhesive TC-2707
(5)
Storage and Shelf Life
Storage: Store 3M™ Thermally Conductive Epoxy Adhesive TC-2707 at 15-27°C (60-80°F) or refrigerate for maximum
shelf life and to reduce filler settling.
Shelf Life: 3M adhesive TC-2707 has a shelf life of 12 months after date of manufacture when stored in the original
packaging and 15-27°C (60-80°F) room temperature storage conditions.
3M™ Thermally Conductive Epoxy Adhesive TC-2707
Regulatory
For regulatory information about this product, contact your 3M representative.
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.
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.
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.
Safety Data Sheet
Consult Safety Data Sheet before use.
3M and EPX are trademarks of 3M Company.
Please recycle.
©3M 2014. All rights reserved.
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Electronics Materials Solutions Division
3M Center, Building 225-3S-06
St. Paul, MN 55144-1000
1-800-251-8634 phone
651-778-4244 fax
www.3M.com/electronics
