Technical Data | September 2018 3MTM Thermally Conductive Epoxy Adhesive TC-2707 Product Description 3MTM Thermally Conductive Epoxy Adhesive TC-2707 is a thermally conductive 2-part epoxy using aluminum metal filler for good thermal conductivity with high adhesion. Key Features * * * * * * * * * High adhesive strength Slight tack allows pre-assembly Good surface wet out Low viscosity for potting applications Good gap filling Thin bonding line Good thermal conductivity (0.72 W/m-K) Low Cl ion content and outgassing Thermally and electrically conductive 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. 3MTM Thermally Conductive Epoxy Adhesive TC-2707 Property Value *Viscosity Base Accelerator Mixed 95,00 cps 25,000 cps 60,000 cps Base Resin Base Accelerator Aluminum Volume Weight Epoxy Amine 50% by weight 2:1 2.00:0.96 60 minutes at 23C (72F) Filler Mix Ratio (B:A) Worklife *Viscosity it measured 40mm, 2cone at 10 1/sec. Applications * * * * LED Assembly Thermal fixing battery cell and thermal management for EV/HEV battery Potting applications General gap filling Application Techniques and Product Use For bonding rigid to rigid parts, it is suggested that the bond line thickness and edge fill be designed to optimize: 3MTM Thermally Conductive Epoxy TC-2707 1. Bond Strength 2. Thermal Resistance A typical suggested bond line is in the 3-7 mil (0.076- 0.018mm) 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 correct balance Bond Line Thickness vs Thermal Resistance vs Bond Strength A "fillet" at the edge 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. 3TM Thermal Conductive Epoxy TC-2707 is supplied in dual syringe plastic duo-pak cartridges as part of the 3TM EPXTM Plus II Applicator System. The duo-pak cartridges are supplied in a 37 or 50 ml configuration. To use the 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 (i.e.: 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. 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. 3MTM EPXTM Plus II Applicator Mix Nozzles Use only 3MTM EPXTM Plus II Applicator and Mix Nozzles to ensure optimum product performance. Typical Cured Physical Properties and Performance Characteristics Note: The following technical information and data should be considered representative or typical only and should not be used for specification purposes. Final product specifications and testing methods will be outlined in the products Certificate of Analysis (COA) that is shipped with the commercialized product once it is approved by 3M for general commercialization and development work is completed. 3MTM Thermally Conductive Epoxy Adhesive TC-2707 Property Method* Color Shore D Hardness Glass Transition Temperature Thermal Coefficient of Expansion ASTM D2240 ASTM 1356 ASTM E831 Thermal Conductivity Thermal Impedance ASTM D5470 ASTM D5470 Value Gray 80 See Chart on page 3 75 X 10 -6C (below Tag) 160 X10 -6/C (above Tg) 0.72 W/m-K 3.51X 10-5 mK/W (1 mil) 3MTM Thermally Conductive Epoxy TC-2707 Volume Resistivity1 Total Outgassing ASTM D257 ASTM 5116 Siloxane Outgassing Extractable Chloride ASTM 5516 ASTM D7994 1.6 x 1011ohm-cm <1000 ug/g (GC/MS, 85 C/3 hours) <5 ug/g (GC/MS, 85C/3 hours <30 ug/g (hexane extraction) *Methods listed as ASTM are tested in accordance with the ASTM method noted *Disclaimer if applicable to chart above 1) As the 3MTM 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 filler is "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 application where a powered electrical circuit is used or where a reliable volume resistivity and/or dielectric strength is desired. 3MTM Thermally Conductive Epoxy Adhesive TC-2810 uses ceramic filler and is a suggested product to test for these types of application performances needs. Curing Cure Schedule: 23C/24 hours 50C/270 minutes 70C/90 minutes 90C/30 minutes 120C/10 minutes Typical Shear Strength, Peel Strength, Tg vs Cure Temperature/Time Note: The following technical information and data should be considered representative or typical only and should not be used for specification purposes. Final product specifications and testing methods will be outlined in the products Certificate of Analysis (COA) that is shipped with the commercialized product once it is approved by 3M for general commercialization and development work is completed. 3MTM Thermally Conductive Epoxy Adhesive TC-2707 23 C (72 F) 24 hours Overlap Shears N/mm2 (psi) (ASTM D-1002) T-Peel (piw) (ASTM D-1876) Tg (C) (ASTM E-1356) 90 C (194 F) 30 minutes 120 C (248 F) 10 minutes >18.62 (2700) >18.62 (2700) >18.62 (2700) >7 >7 >7 60 66 66 *Methods listed as ASTM are tested in accordance with the ASTM method noted *Disclaimer if applicable to chart above Storage and Shelf Life The shelf life of 3MTM Thermally Conductive Epoxy Adhesive TC-2707 is 12 months from the date of manufacture when stored in original cartons at 21C (70F) and 50% relative humidity Certificate of Analysis (COA) The COA contains the 3M specifications and test methods for the products performance limits that the product will be supplied against. The 3M product is supplied to 3M COA test specifications and the COA test methods. Contact your local 3M representative for this product's COA. 3MTM Thermally Conductive Epoxy TC-2707 Safety Data Sheet: Consult Safety Data Sheet before use. 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. 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