Technical Data August 2014 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 fillers for good thermal conductivity with high adhesion. 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: T he following technical information and data should be considered representative or typical only, and should not be used for specification purposes. Product 3MTM Thermally Conductive Epoxy Adhesive TC-2707 Viscosity Base 170,000 cps Accelerator 25,000 cps Mixed 100,000 cps Base Resin Base Accelerator Epoxy Amine Filler Aluminum 50% by weight Mix Ratio (B:A) Volume Weight Worklife 2:1 2.00 : 0.96 60 minutes at 23C (72F) 3MTM Thermally Conductive Epoxy Adhesive TC-2707 Typical Cured Properties Note: T he following technical information and data should be considered representative or typical only, and should not be used for specification purposes. Product 3MTM Thermally Conductive Epoxy Adhesive TC-2707 Color Gray Shore D Hardness 84 Glass Transition Temperature 60C (tan delta) See Chart on page 3 56 x 10-6/C (below Tg) 132 x 10-6/C (above Tg) Thermal Coefficient of Expansion Thermal Conductivity 0.72 W/m-K Thermal Impedance 3.51 x 10-5 mK/W (1 mil) Volume Resistivity1 1.6 x 1011 ohm-cm Total Outgassing <25 micro-gm/gm (GC/MS, 85C/3 hours) Hydrocarbon Outgassing <25 micro-gm/gm (GC/MS, 85C/3 hours) Siloxane Outgassing <5 micro-gm/gm (GC/MS, 85C/3 hours) Extractable Chloride <30 micro-gm/gm (hexane extraction) 1As 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 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. 3MTM 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) 3MTM Thermally Conductive Epoxy Adhesive TC-2707 Curing Cure Schedule: 23C / 24 hours 50C / 270 minutes 70C / 90 minutes 90C / 30 minutes 120C / 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 23C (72F) 24 hours 50C (122F) 270 minutes 70C (158F) 90 minutes 90C (194F) 30 minutes 120C (248F) 10 minutes >2700 >2700 >2700 >2700 >2700 T-Peel (piw) (ASTM D-1876) >7 >7 >7 >7 >7 Tg (C) Tan Delta 60 83 95 100 100 Tg (C) Storage Modulus 48 73 85 86 89 Overlap Shear (psi) (ASTM D-1002) 1600 160 1400 140 1200 120 1000 100 800 80 600 60 400 40 200 20 0 0 20 40 60 80 100 Cure Temperature (C) (3) 120 140 Tg (C) Cure Time (Minutes) Time to Reach Maximum Tg (C) for 3MTM Thermally Conductive Epoxy Adhesive TC-2707 Cured using Various Conditions Cure Time (minutes) Tg (C) 3MTM 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. 3MTM Thermally Conductive Epoxy TC-2707 is supplied in dual syringe plastic duo-pak cartridges as part of the 3MTM EPXTM 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 3MTM EPXTM 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. 3MTM EPXTM Applicator and Mix Nozzles Use only 3MTM EPXTM Applicator and Mix Nozzles to ensure optimum product performance. Sturdy 3MTM EPXTM Applicators EPX Plunger Mix Nozzle EPX Applicator Epoxy duo-pac (4) 3MTM Thermally Conductive Epoxy Adhesive TC-2707 Storage and Shelf Life Storage: Store 3MTM Thermally Conductive Epoxy Adhesive TC-2707 at 15-27C (60-80F) 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 15-27C (60-80F) room temperature storage conditions. Safety Data Sheet Consult Safety Data Sheet before use. 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. 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