A heat sink bonded with the wrong adhesive can look mechanically sound for months before the real problem shows up as a slow, cumulative overheating trend rather than an obvious joint failure. Incure’s Epo-Weld™ TC-9033 exists specifically to keep that bond line from becoming the weak link in a component’s thermal path, pairing aluminum-filled thermal conductivity with the paste consistency that heat sink and cryogenic bonding actually require.
An Aluminum-Filled Epoxy Built to Replace Non-Conductive Adhesives
TC-9033 is a two-part, aluminum-filled epoxy engineered specifically for thermal management applications where a standard structural adhesive would otherwise create an unintended insulating layer between a heat-generating component and the surface meant to draw that heat away. Bonding a heat sink with a non-conductive adhesive doesn’t just underperform — it actively works against the sink’s purpose, trapping heat at the interface instead of letting it move through. TC-9033’s aluminum filler gives the cured bond line meaningfully better thermal conductivity than an unfilled epoxy, while still delivering genuine structural performance: 12,000 psi flexural strength and 2,600 psi tensile shear at a Shore D70–D80 cured hardness, figures that hold up under the mechanical vibration and thermal cycling that power electronics assemblies see in continuous service.
Thixotropic Paste Consistency Solves a Real Dispensing Problem
TC-9033’s thixotropic paste consistency is a deliberate process choice, not an incidental property. A flowable adhesive is efficient on a flat, well-defined bond line, but it runs or sags on a vertical surface or an irregular heat sink fin geometry before it has a chance to cure — exactly the situation TC-9033 is formulated to avoid. The paste holds its shape and stays where it’s placed, which matters on assemblies where the bond geometry isn’t a simple flat interface, or where the joint has to be positioned and held without an oven step available to lock it in early. That same consistency gives TC-9033 genuine gap-filling capability, bridging minor surface irregularities between a heat sink and a component rather than requiring both mating surfaces to be machined to a tight, uniform tolerance before bonding.
Email Us with your heat sink geometry and bonding process, and Incure’s engineers can confirm whether TC-9033’s paste consistency fits your application.
NASA Outgassing Compliance Opens Up Cryogenic and Vacuum Assembly
TC-9033 meets NASA outgassing requirements, a specification that matters well beyond aerospace work. Any bond line inside a sealed or vacuum enclosure risks off-gassing volatile compounds over time, and that off-gassing can redeposit as contamination on nearby optics, sensors, or electrical contacts — a slow-developing failure mode that’s difficult to trace back to the adhesive once it’s already caused a problem. That makes TC-9033 a fit for cryogenic component bonding and other sealed-enclosure assemblies where the adhesive needs to hold a structural bond without becoming a long-term contamination source for whatever sensitive equipment shares the same sealed space — the manufacturer’s own catalog names cryogenic components specifically among TC-9033’s intended applications, alongside general heat-sink bonding for power electronics.
Cure Schedule Trades Oven Capacity for Cycle Time
TC-9033 cures on a 24–48 hour room-temperature schedule, or accelerated to roughly 2 hours with a 200°F post-cure step. That choice is a throughput decision more than a performance one: the accelerated schedule frees up fixturing faster on a production line running enough volume to justify oven capacity, while the room-temperature path avoids that added equipment requirement on lower-volume or prototype runs. Because TC-9033’s paste consistency already holds the joint in position without flowing, neither cure path requires the kind of active clamping a flowable adhesive might need to keep the bond line from shifting before it sets.
Where TC-9033 Fits Against Its Line-Mates
TC-9033 is one of three grades in Incure’s thermally conductive epoxy line, and the choice between them comes down to viscosity and electrical requirements rather than thermal performance alone. Epo-Weld™ TC-9042 shares the same aluminum filler but trades TC-9033’s paste consistency for a flowable viscosity suited to thin, precisely controlled bond lines rather than gap-filling on irregular surfaces. Epo-Weld™ TC-9051 swaps the metallic aluminum filler for aluminum nitride, adding electrical insulation alongside thermal conductivity — relevant for a bond line sitting near a live circuit, a claim TC-9033 doesn’t make. For a heat sink or cryogenic assembly where gap-filling, vertical application, and general electrical conductivity through the bond line are acceptable, TC-9033 remains the general-purpose choice of the three.
Where It Fits
Power electronics heat-sink bonding is TC-9033’s core application, moving heat away from transistors and power modules while holding a structural bond through repeated thermal cycling. Cryogenic and vacuum-sealed component assembly draws on the same NASA-outgassing compliance to avoid long-term contamination inside a sealed enclosure. Facilities pairing TC-9033 with structural bonding elsewhere on the same assembly can review Incure’s Epo-Weld™ High Temperature Epoxy line, and applications needing electrical isolation alongside thermal conductivity should compare TC-9033 against the full Epo-Weld™ Thermally Conductive Epoxy line, including the aluminum-nitride-filled TC-9051. For radiative rather than conductive heat rejection, Incure’s Epo-Weld™ HECC high-emissive ceramic coatings address a related but mechanically distinct problem.
Contact Our Team to confirm Epo-Weld™ TC-9033 for your heat sink or cryogenic bonding application.
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