{"id":37027,"date":"2026-04-10T08:07:14","date_gmt":"2026-04-10T08:07:14","guid":{"rendered":"https:\/\/trumonytechs.com\/?p=37027"},"modified":"2026-09-28T02:55:55","modified_gmt":"2026-09-28T02:55:55","slug":"what-is-thermal-paste-made-of","status":"publish","type":"post","link":"https:\/\/www.trumonytechs.com\/hu\/what-is-thermal-paste-made-of\/","title":{"rendered":"Mib\u0151l k\u00e9sz\u00fcl a h\u0151vezet\u0151 paszta?"},"content":{"rendered":"<p class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\">Thermal paste, thermal grease, and Thermal Interface Material (TIM) refer to the same engineered material class \u2014 this article uses all three terms interchangeably throughout.<\/p>\n<p class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\">Understanding what thermal paste is made of requires examining two co-dependent systems: the filler phase, which drives thermal conductivity, and the carrier matrix, which controls long-term mechanical and chemical stability. The core answer is this \u2014 thermal paste consists of thermally conductive filler particles suspended in a carrier base, where filler type, particle size, and loading concentration collectively determine conductivity, electrical safety, and service life.<\/p>\n<p class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\">The thermal conductivity values listed for individual filler materials throughout this article are intrinsic reference values for bulk polycrystalline material under standard room-temperature conditions. Actual formulation bulk conductivity depends on loading concentration, particle size distribution, and matrix interface resistance. Final performance requires measured data from the complete formulation per <a class=\"underline underline underline-offset-2 decoration-1 decoration-current\/40 hover:decoration-current focus:decoration-current\" href=\"https:\/\/www.astm.org\/d5470-06r17.html\">ASTM D5470<\/a> or equivalent. For regulated applications including medical devices and EV energy storage systems, request complete test reports from your supplier covering the applicable industry standard.<\/p>\n<p class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\">This article does not apply to phase-change materials, thermally conductive adhesives, or graphite sheet TIMs \u2014 those material classes involve distinct chemistry and selection criteria outside this scope.<\/p>\n<h2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\">Why Thermal Paste Conductivity Alone Falls Short<\/h2>\n<p class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\">Thermal conductivity in a TIM formulation varies by filler type, loading concentration, and application environment \u2014 maximizing W\/m\u00b7K alone produces a suboptimal design outcome in most engineering scenarios. This is a distinction we consistently apply in our formulation development work, where single-axis optimization regularly fails in real application validation.<\/p>\n<p class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\">Three performance axes govern every formulation decision:<\/p>\n<ul class=\"[li_&amp;]:mb-0 [li_&amp;]:mt-1 [li_&amp;]:gap-1 [&amp;:not(:last-child)_ul]:pb-1 [&amp;:not(:last-child)_ol]:pb-1 list-disc flex flex-col gap-1 pl-8 mb-3\">\n<li class=\"whitespace-normal break-words pl-2\"><strong>Thermal conductivity (W\/m\u00b7K):<\/strong> How efficiently heat transfers through the bulk material.<\/li>\n<li class=\"whitespace-normal break-words pl-2\"><strong>Dielectric strength (kV\/mm):<\/strong> Whether the cured or uncured paste resists electrical leakage under operating voltage.<\/li>\n<li class=\"whitespace-normal break-words pl-2\"><strong>Pump-out resistance:<\/strong> Whether the paste maintains gap-fill integrity through thermal cycling without migrating out of the interface.<\/li>\n<\/ul>\n<p class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\">These three axes trade against each other. Metallic fillers maximize conductivity but compromise dielectric strength. High filler loading increases conductivity but raises viscosity and worsens pump-out resistance under cycling. Understanding this three-axis trade-off is the prerequisite for reading every section that follows.<\/p>\n<h2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\">Filler Materials and Their Conductivity Trade-offs<\/h2>\n<p class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\">Filler materials in a TIM formulation determine bulk thermal conductivity, electrical behavior, and particle morphology constraints \u2014 each filler category forces a distinct set of engineering compromises that no carrier modification can fully offset. Three categories cover the full design space \u2014 metallic, ceramic, and carbon-based \u2014 each representing a distinct set of <a class=\"underline underline underline-offset-2 decoration-1 decoration-current\/40 hover:decoration-current focus:decoration-current\" href=\"https:\/\/www.trumonytechs.com\/what-are-the-different-types-of-thermal-pastes\/\">types of thermal pastes<\/a> with its own conductivity ceiling, electrical behavior, and carrier compatibility constraints.<\/p>\n<h3 class=\"text-text-100 mt-2 -mb-1 text-base font-bold\">When to Choose Metallic Fillers<\/h3>\n<p class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\">Metallic fillers deliver the highest intrinsic thermal conductivity values available across filler categories. Silver&#8217;s intrinsic conductivity \u2014 roughly four hundred watts per meter-kelvin at room temperature \u2014 makes it the highest-performing metallic filler available (420 W\/m\u00b7K, bulk polycrystalline, room temperature). Copper (Cu) reaches approximately 400 W\/m\u00b7K under the same conditions. Aluminum (Al) reaches approximately 237 W\/m\u00b7K. These values make metallic fillers the preferred choice where thermal performance is the dominant constraint and electrical exposure is controlled by design.<\/p>\n<p class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\">The trade-off is direct. Metallic fillers are electrically conductive. A TIM formulation using silver or copper filler will exhibit bulk electrical conductivity proportional to particle loading and network percolation. In exposed-pad packages, bare-die designs, or any configuration where paste migration reaches a voltage-carrying surface, metallic TIMs create leakage risk. The risk is not marginal \u2014 it is a disqualifying condition in most power electronics designs unless the interface geometry is fully enclosed and verified. Leakage current risk should be evaluated against the application voltage level \u2014 for systems above 48 V DC, a volume resistivity of at least 1 G\u03a9\u00b7cm is typically required \u2014 and verified per the applicable assembly qualification standard rather than inferred from bulk material data alone.<\/p>\n<p class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\">Aluminum-filled pastes occupy a middle position. Aluminum&#8217;s bulk conductivity is lower than silver or copper. Aluminum oxide forms naturally on particle surfaces during processing, which partially reduces bulk electrical conductivity at the formulation level \u2014 but this oxide layer is process-dependent and not a guaranteed isolation barrier, so aluminum-filled TIMs should not be treated as electrically safe by default.<\/p>\n<h3 class=\"text-text-100 mt-2 -mb-1 text-base font-bold\">Ceramic Fillers for Isolation<\/h3>\n<p class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\">Ceramic fillers provide meaningful thermal conductivity combined with intrinsic electrical insulation. This combination makes ceramic-filled TIMs the dominant choice in power electronics, EV battery modules, and any application where dielectric strength is a specification requirement. These fillers are also the backbone of most <a class=\"underline underline underline-offset-2 decoration-1 decoration-current\/40 hover:decoration-current focus:decoration-current\" href=\"https:\/\/www.trumonytechs.com\/advances-in-silicone-free-thermal-interface-materials\/\">silicone-free thermal interface solutions<\/a>, which increasingly specify ceramic systems to eliminate both silicone contamination and electrical isolation risk simultaneously.<\/p>\n<p class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\">Three ceramic fillers cover most design scenarios:<\/p>\n<div class=\"overflow-x-auto w-full px-2 mb-6\">\n<table class=\"min-w-full border-collapse text-sm leading-[1.7] whitespace-normal\">\n<thead class=\"text-left\">\n<tr>\n<th class=\"text-text-100 border-b-0.5 border-border-300\/60 py-2 pr-4 align-top font-bold\" scope=\"col\">Ceramic Filler<\/th>\n<th class=\"text-text-100 border-b-0.5 border-border-300\/60 py-2 pr-4 align-top font-bold\" scope=\"col\">Intrinsic Thermal Conductivity (approx.)*<\/th>\n<th class=\"text-text-100 border-b-0.5 border-border-300\/60 py-2 pr-4 align-top font-bold\" scope=\"col\">Notes on Conditions<\/th>\n<th class=\"text-text-100 border-b-0.5 border-border-300\/60 py-2 pr-4 align-top font-bold\" scope=\"col\">Dielectric Strength<\/th>\n<th class=\"text-text-100 border-b-0.5 border-border-300\/60 py-2 pr-4 align-top font-bold\" scope=\"col\">Relative Cost<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td class=\"border-b-0.5 border-border-300\/30 py-2 pr-4 align-top\">Aluminum Oxide (Al\u2082O\u2083)<\/td>\n<td class=\"border-b-0.5 border-border-300\/30 py-2 pr-4 align-top\">~30 W\/m\u00b7K<\/td>\n<td class=\"border-b-0.5 border-border-300\/30 py-2 pr-4 align-top\">Bulk polycrystalline, room temperature<\/td>\n<td class=\"border-b-0.5 border-border-300\/30 py-2 pr-4 align-top\">High<\/td>\n<td class=\"border-b-0.5 border-border-300\/30 py-2 pr-4 align-top\">Low<\/td>\n<\/tr>\n<tr>\n<td class=\"border-b-0.5 border-border-300\/30 py-2 pr-4 align-top\">Zinc Oxide (ZnO)<\/td>\n<td class=\"border-b-0.5 border-border-300\/30 py-2 pr-4 align-top\">~25\u201329 W\/m\u00b7K<\/td>\n<td class=\"border-b-0.5 border-border-300\/30 py-2 pr-4 align-top\">Bulk polycrystalline, room temperature<\/td>\n<td class=\"border-b-0.5 border-border-300\/30 py-2 pr-4 align-top\">Moderate\u2013High<\/td>\n<td class=\"border-b-0.5 border-border-300\/30 py-2 pr-4 align-top\">Low\u2013Medium<\/td>\n<\/tr>\n<tr>\n<td class=\"border-b-0.5 border-border-300\/30 py-2 pr-4 align-top\">Boron Nitride (BN)<\/td>\n<td class=\"border-b-0.5 border-border-300\/30 py-2 pr-4 align-top\">Up to ~400 W\/m\u00b7K (axial)<\/td>\n<td class=\"border-b-0.5 border-border-300\/30 py-2 pr-4 align-top\">h-BN platelet, axial direction<\/td>\n<td class=\"border-b-0.5 border-border-300\/30 py-2 pr-4 align-top\">High<\/td>\n<td class=\"border-b-0.5 border-border-300\/30 py-2 pr-4 align-top\">High<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<p class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\">*Intrinsic values are standard reference values for bulk polycrystalline material at room temperature. Actual formulation bulk thermal conductivity depends on loading concentration, particle size distribution, and matrix interface resistance, and must be confirmed by complete-formulation testing per ASTM D5470 or equivalent. Formulation bulk conductivity is substantially lower than filler intrinsic values at all practical loading levels.<\/p>\n<p class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\">Aluminum oxide is the most widely used ceramic filler due to low cost and reliable dielectric performance. Zinc oxide offers comparable electrical isolation with slightly different morphology, making it useful in formulations that require specific rheological behavior. Boron nitride is structurally distinct \u2014 its platelet morphology provides significantly higher axial thermal conductivity than equiaxed ceramics at equivalent loading. The platelet geometry also allows higher packing density in multimodal distributions, which is a formulation advantage when conductivity targets exceed what Al\u2082O\u2083 or ZnO can deliver without excessive loading.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-37029 aligncenter\" src=\"https:\/\/www.trumonytechs.com\/wp-content\/uploads\/2026\/04\/BN-platelet-vs-Al2O3-particle-size-contrast.webp\" alt=\"ceramic filler aluminum oxide boron nitride particle morphology thermal conductivity comparison\" width=\"768\" height=\"573\" srcset=\"https:\/\/www.trumonytechs.com\/wp-content\/uploads\/2026\/04\/BN-platelet-vs-Al2O3-particle-size-contrast.webp 768w, https:\/\/www.trumonytechs.com\/wp-content\/uploads\/2026\/04\/BN-platelet-vs-Al2O3-particle-size-contrast-300x224.webp 300w, https:\/\/www.trumonytechs.com\/wp-content\/uploads\/2026\/04\/BN-platelet-vs-Al2O3-particle-size-contrast-16x12.webp 16w, https:\/\/www.trumonytechs.com\/wp-content\/uploads\/2026\/04\/BN-platelet-vs-Al2O3-particle-size-contrast-766x573.webp 766w\" sizes=\"auto, (max-width: 768px) 100vw, 768px\" \/><\/p>\n<h3 class=\"text-text-100 mt-2 -mb-1 text-base font-bold\">Carbon-Based Fillers and Thermal Anisotropy<\/h3>\n<p class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\">When heat flux direction can be controlled by assembly geometry, carbon-based fillers offer thermal conductivity pathways that equiaxed ceramics cannot approach \u2014 graphite, CNTs, and graphene platelets all conduct heat efficiently along their basal or axial direction while remaining poor conductors perpendicular to it.<\/p>\n<p class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\">Individual CNTs exhibit theoretical axial thermal conductivity values reported above 3,000 W\/m\u00b7K under idealized single-nanotube measurement conditions; in bulk formulations, realized conductivity is substantially lower due to interface resistance between tubes and matrix, random orientation distribution, and agglomeration defects \u2014 reported bulk formulation values typically fall in the range of tens to low hundreds of W\/m\u00b7K depending on CNT quality, loading, and alignment. Graphene platelets carry similar anisotropy.<\/p>\n<p class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\">This anisotropy has two implications. First, orientation control during dispensing and curing determines whether the high-conductivity axis aligns with the heat transfer direction. Second, carbon-based fillers at sufficient loading exhibit measurable electrical conductivity, particularly along the high-conductivity axis. These fillers are best suited to applications where directional thermal management is designed into the assembly and where electrical isolation is provided structurally rather than by the TIM itself. Emerging power module and high-density electronics applications are where we see carbon-based TIMs applied with the most engineering discipline.<\/p>\n<p class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\">Which filler category a formulation uses determines its thermal ceiling \u2014 but the carrier matrix determines whether that ceiling holds after five years of thermal cycling.<\/p>\n<h2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\">Carrier Matrix Systems and Long-Term Stability<\/h2>\n<p class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\">Long-term reliability in any TIM program depends more on carrier selection than on filler choice alone \u2014 the matrix governs oil bleed resistance, dispensing compatibility, and the service temperature ceiling that determines whether a formulation holds specification over a 10-year battery pack life. Filler selection cannot compensate for a carrier that degrades under the application&#8217;s thermal cycling profile.<\/p>\n<h3 class=\"text-text-100 mt-2 -mb-1 text-base font-bold\">Silicone Oil Base and Its Thermal Limits<\/h3>\n<p class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\">Silicone-oil carriers are the most widely used TIM base due to low-temperature flexibility, oxidative stability up to approximately 150\u2013200 \u00b0C (depending on polydimethylsiloxane molecular weight and formulation additives \u2014 supplier TGA data should be requested to confirm the specific upper limit for any given formulation), and compatibility with a broad range of fillers. Polydimethylsiloxane (PDMS) and its functional derivatives are the standard silicone base fluids.<\/p>\n<p class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\">Two risks are process-relevant. First, oil bleed \u2014 the migration of low-molecular-weight silicone fractions out of the filler network under thermal cycling or sustained elevated temperature. Oil bleed deposits silicone on adjacent surfaces, which causes adhesion failures in secondary bonding operations and can contaminate optical components or electrical contacts. Second, silicone vapor \u2014 at temperatures approaching the upper stability limit, volatile silicone species can deposit on connector contacts and relay surfaces. In automotive and aerospace applications, silicone contamination is a controlled risk requiring qualification testing, not a theoretical concern.<\/p>\n<h3 class=\"text-text-100 mt-2 -mb-1 text-base font-bold\">Non-Silicone and Hydrocarbon Carriers<\/h3>\n<p class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\">Where silicone vapors are a disqualifying condition rather than a theoretical concern, synthetic hydrocarbon carriers \u2014 PAO, PIB, and other non-silicone bases \u2014 provide the stable, low-vapor-pressure alternative that automotive and optical system programs require. These carriers are specified in applications where silicone volatiles are disqualifying: certain automotive control modules, hard disk drive environments, and optical systems.<\/p>\n<p class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\">PAO carriers in particular offer good thermal stability, low vapor pressure, and compatibility with high-temperature filler systems. The trade-off is narrower formulation latitude. Non-silicone bases often have higher viscosity baselines and more limited low-temperature flow behavior than silicone counterparts. For EV battery pack applications with long service intervals and operating temperatures that cycle below 0 \u00b0C, carrier selection requires validation against the full temperature profile \u2014 not just the upper limit. We specify non-silicone bases for automotive TIM programs where silicone vapor contamination is explicitly excluded by the OEM requirement.<\/p>\n<p class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\">Carrier selection sets the stability boundary; the formulation parameters that follow \u2014 particle size, loading concentration, and size distribution \u2014 determine how much of the filler&#8217;s thermal potential actually translates into measured bulk conductivity.<\/p>\n<h2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\">Particle Size, Loading, and Multimodal Grading<\/h2>\n<p class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\">Three controllable parameters \u2014 particle size, volume loading, and size grading \u2014 set the performance ceiling of any TIM formulation, and no single variable can be adjusted in isolation without shifting the other two.<\/p>\n<p class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"><strong>Particle size<\/strong> determines packing geometry and interface contact area. Smaller particles (sub-micron range) maximize surface contact but raise viscosity sharply at equivalent loading. Larger particles (5\u201320 \u00b5m range) allow higher loading at lower viscosity but reduce packing uniformity in thin bond lines.<\/p>\n<p class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"><strong>Volume loading concentration<\/strong> drives conductivity to a threshold. Below the percolation threshold \u2014 the concentration at which filler particles form a continuous thermal network \u2014 conductivity scales weakly with loading. For typical ceramic filler systems, this threshold falls in the range of approximately 35\u201345 volume percent; above this concentration, conductivity rises more steeply, then plateaus as matrix interfacial resistance limits further gains. Practical loading is additionally constrained by viscosity: above roughly two-thirds of the formulation by volume (approximately 65\u201370 volume percent in most ceramic formulations), viscosity increases prohibitively for dispensing-compatible processing.<\/p>\n<p class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"><strong>Multimodal particle size grading<\/strong> resolves the loading-viscosity conflict. Mixing two or three distinct particle size fractions \u2014 typically combining a coarse fraction in the 10\u201320 \u00b5m range with a fine fraction in the 1\u20132 \u00b5m range \u2014 allows smaller particles to fill void space between larger ones, increasing packing density without increasing viscosity proportionally. Multimodal grading is precisely how high-conductivity formulations (above 6\u20138 W\/m\u00b7K bulk) achieve dispensing-compatible viscosity. How well these parameters translate to field performance depends on <a class=\"underline underline underline-offset-2 decoration-1 decoration-current\/40 hover:decoration-current focus:decoration-current\" href=\"https:\/\/www.trumonytechs.com\/apply-thermal-paste\/\">thermal paste application methods<\/a> and bond line control as much as formulation choice.<\/p>\n<p class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\">These parameters interact, and the design space requires iterative validation per ASTM D5470 for bulk conductivity and rheological testing for process compatibility.<\/p>\n<p class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\">That validation framework becomes the decision filter for the application-sector selection logic that follows.<\/p>\n<h2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\">TIM Selection by Application Sector<\/h2>\n<p class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\">Application-sector TIM selection varies by temperature range, electrical isolation requirement, and dispensing process constraints \u2014 translating the filler-matrix framework into a workable decision path requires matching these three variables to the formulation space available.<\/p>\n<div class=\"overflow-x-auto w-full px-2 mb-6\">\n<table class=\"min-w-full border-collapse text-sm leading-[1.7] whitespace-normal\">\n<thead class=\"text-left\">\n<tr>\n<th class=\"text-text-100 border-b-0.5 border-border-300\/60 py-2 pr-4 align-top font-bold\" scope=\"col\">Application Sector<\/th>\n<th class=\"text-text-100 border-b-0.5 border-border-300\/60 py-2 pr-4 align-top font-bold\" scope=\"col\">Temperature Range (typical)\u2020<\/th>\n<th class=\"text-text-100 border-b-0.5 border-border-300\/60 py-2 pr-4 align-top font-bold\" scope=\"col\">Electrical Isolation Requirement<\/th>\n<th class=\"text-text-100 border-b-0.5 border-border-300\/60 py-2 pr-4 align-top font-bold\" scope=\"col\">Preferred Filler Class<\/th>\n<th class=\"text-text-100 border-b-0.5 border-border-300\/60 py-2 pr-4 align-top font-bold\" scope=\"col\">Carrier Preference<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td class=\"border-b-0.5 border-border-300\/30 py-2 pr-4 align-top\">EV Battery Pack<\/td>\n<td class=\"border-b-0.5 border-border-300\/30 py-2 pr-4 align-top\">\u201330 \u00b0C to 85 \u00b0C (cell surface)<\/td>\n<td class=\"border-b-0.5 border-border-300\/30 py-2 pr-4 align-top\">Required (cell-to-cell)<\/td>\n<td class=\"border-b-0.5 border-border-300\/30 py-2 pr-4 align-top\">Ceramic (Al\u2082O\u2083, BN)<\/td>\n<td class=\"border-b-0.5 border-border-300\/30 py-2 pr-4 align-top\">Non-silicone or low-bleed silicone<\/td>\n<\/tr>\n<tr>\n<td class=\"border-b-0.5 border-border-300\/30 py-2 pr-4 align-top\">Power Modules (IGBT\/SiC)<\/td>\n<td class=\"border-b-0.5 border-border-300\/30 py-2 pr-4 align-top\">Up to 175 \u00b0C junction<\/td>\n<td class=\"border-b-0.5 border-border-300\/30 py-2 pr-4 align-top\">Required<\/td>\n<td class=\"border-b-0.5 border-border-300\/30 py-2 pr-4 align-top\">Ceramic (BN-dominant for conductivity)<\/td>\n<td class=\"border-b-0.5 border-border-300\/30 py-2 pr-4 align-top\">High-stability silicone or PAO<\/td>\n<\/tr>\n<tr>\n<td class=\"border-b-0.5 border-border-300\/30 py-2 pr-4 align-top\">Industrial Electronics<\/td>\n<td class=\"border-b-0.5 border-border-300\/30 py-2 pr-4 align-top\">\u201320 \u00b0C to 125 \u00b0C<\/td>\n<td class=\"border-b-0.5 border-border-300\/30 py-2 pr-4 align-top\">Application-dependent<\/td>\n<td class=\"border-b-0.5 border-border-300\/30 py-2 pr-4 align-top\">Ceramic or metallic depending on isolation<\/td>\n<td class=\"border-b-0.5 border-border-300\/30 py-2 pr-4 align-top\">Silicone<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<p class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\">\u2020Temperature ranges are representative industrial reference values for the stated application sectors. Actual operating limits must be confirmed against OEM thermal management specifications and the applicable qualification standard \u2014 <a class=\"underline underline underline-offset-2 decoration-1 decoration-current\/40 hover:decoration-current focus:decoration-current\" href=\"https:\/\/www.jedec.org\/standards-documents\/docs\/jesd47\">AEC-Q200<\/a> for automotive components, or the relevant IEC or UL standard for the end-use classification.<\/p>\n<p class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\">EV battery packs require electrical isolation between cells or between cells and cooling plates, eliminating metallic fillers from most positions. Thermal cycling depth is high, so pump-out resistance and oil bleed behavior over 10+ years drive carrier selection. We validate EV battery TIMs against multi-thousand-cycle thermal shock profiles before production release.<\/p>\n<p class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\">Power module applications \u2014 particularly SiC and IGBT modules operating above 150 \u00b0C \u2014 require both high conductivity and dielectric strength. BN-dominant ceramic formulations in high-stability carriers address this. Non-silicone carriers are increasingly specified by automotive OEMs for power module TIMs due to silicone contamination exclusions in module assembly environments.<\/p>\n<p class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\">Industrial electronics covers a broad temperature range with more variable isolation requirements. Metallic fillers remain viable in enclosed-interface geometries without exposed voltages. Ceramic fillers cover all isolation-required positions. Carrier selection is less constrained than in automotive, though long service life requirements in infrastructure electronics increasingly favor lower-bleed formulations. For a structured framework on <a class=\"underline underline underline-offset-2 decoration-1 decoration-current\/40 hover:decoration-current focus:decoration-current\" href=\"https:\/\/www.trumonytechs.com\/how-do-you-choose-a-thermal-interface-material\/\">choosing a thermal interface material<\/a> across these sectors, carrier stability under the expected thermal cycling profile is the starting filter.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-37030 aligncenter\" src=\"https:\/\/www.trumonytechs.com\/wp-content\/uploads\/2026\/04\/EV-battery-module-thermal-pad-installation.webp\" alt=\"thermal paste application ev battery pack power module industrial electronics selection guide\" width=\"768\" height=\"573\" srcset=\"https:\/\/www.trumonytechs.com\/wp-content\/uploads\/2026\/04\/EV-battery-module-thermal-pad-installation.webp 768w, https:\/\/www.trumonytechs.com\/wp-content\/uploads\/2026\/04\/EV-battery-module-thermal-pad-installation-300x224.webp 300w, https:\/\/www.trumonytechs.com\/wp-content\/uploads\/2026\/04\/EV-battery-module-thermal-pad-installation-16x12.webp 16w, https:\/\/www.trumonytechs.com\/wp-content\/uploads\/2026\/04\/EV-battery-module-thermal-pad-installation-766x573.webp 766w\" sizes=\"auto, (max-width: 768px) 100vw, 768px\" \/><\/p>\n<p class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\">The questions most frequently raised in selection reviews \u2014 about metallic filler safety, ceramic filler trade-offs, and long-term carrier stability \u2014 are addressed directly below.<\/p>\n<h2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\">Conclusion<\/h2>\n<p class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\">In our project experience across EV battery thermal management and power module programs, single-axis optimization \u2014 choosing the highest-conductivity option without validating dielectric strength, pump-out resistance, and carrier stability against the actual service life profile \u2014 has been a recurring source of TIM selection errors. The material chemistry described in this article provides the framework to avoid that failure mode and to read supplier datasheets with the specificity those decisions require.<\/p>\n<p class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\">If your application requires a tested, specification-grade solution, our <a class=\"underline underline underline-offset-2 decoration-1 decoration-current\/40 hover:decoration-current focus:decoration-current\" href=\"https:\/\/www.trumonytechs.com\/pf\/thermal-conductive-silicone-grease\/\">thermal conductive grease<\/a> line covers silicone-base and non-silicone formulations validated across the EV battery and power module sectors. We&#8217;re available to support filler and carrier selection for your specific thermal cycling profile and isolation requirement \u2014 reach out to discuss your program.<\/p>\n<h2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\">FAQ<\/h2>\n<h3 class=\"text-text-100 mt-2 -mb-1 text-base font-bold\">Do metallic fillers make thermal paste electrically conductive in power electronics?<\/h3>\n<p class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\">Metallic thermal paste fillers conduct electricity once particle loading passes the percolation threshold \u2014 the safety issue is not bulk conductivity in isolation, but whether paste migrates to voltage-carrying surfaces during thermal cycling. Fully enclosed, laterally constrained interfaces can use metallic TIMs safely if migration risk has been characterized. Exposed-pad packages or any geometry where squeeze-out reaches board traces require ceramic-filled alternatives; leakage risk must be verified per the applicable assembly qualification standard, not inferred from bulk material data.<\/p>\n<h3 class=\"text-text-100 mt-2 -mb-1 text-base font-bold\">How do aluminum oxide, zinc oxide, and boron nitride compare as ceramic fillers?<\/h3>\n<p class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\">Al\u2082O\u2083 (~30 W\/m\u00b7K intrinsic) is the standard choice for formulations where bulk conductivity below 4\u20135 W\/m\u00b7K is acceptable and cost is a constraint. ZnO (~25\u201329 W\/m\u00b7K) offers similar isolation with different particle morphology, which affects rheological behavior in high-loading formulations. BN platelet structure enables bulk conductivity above 6\u20138 W\/m\u00b7K while maintaining dielectric strength, at a significant cost premium. All three values are filler reference figures; actual formulation conductivity requires ASTM D5470 testing.<\/p>\n<h3 class=\"text-text-100 mt-2 -mb-1 text-base font-bold\">What distinguishes silicone-base from non-silicone-base TIMs at high temperature?<\/h3>\n<p class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\">Silicone-oil carriers hold up to approximately 150\u2013200 \u00b0C, but above that range volatilize low-molecular-weight fractions onto adjacent surfaces \u2014 a qualification-level failure mode in automotive environments. PAO and synthetic hydrocarbon carriers exhibit lower vapor pressure, less oil bleed, and no silicone-specific contamination risk. Automotive and long-service-interval power electronics programs increasingly specify non-silicone bases, despite their narrower low-temperature processing range.<\/p>\n<h3 class=\"text-text-100 mt-2 -mb-1 text-base font-bold\">How do particle size and loading concentration affect formulation thermal conductivity?<\/h3>\n<p class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\">Below the percolation threshold (~35\u201345 vol% for ceramic fillers), additional filler adds little conductivity; once exceeded, conductivity rises steeply but plateaus as matrix interfacial resistance becomes the limiting factor. Sub-micron particles raise viscosity sharply at equivalent loading; larger particles in the 10\u201320 \u00b5m range allow higher loading at lower viscosity. Multimodal distributions \u2014 mixing coarse and fine fractions \u2014 resolve this conflict, which is why formulations above 6\u20138 W\/m\u00b7K bulk routinely use bimodal or trimodal size distributions.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Thermal paste, thermal grease, and Thermal Interface Material (TIM) refer to the same engineered material class \u2014 this article uses all three terms interchangeably throughout. Understanding what thermal paste is made of requires examining two co-dependent systems: the filler phase, which drives thermal conductivity, and the carrier matrix, which controls long-term mechanical and chemical stability. &#8230; <a title=\"Mib\u0151l k\u00e9sz\u00fcl a h\u0151vezet\u0151 paszta?\" class=\"read-more\" href=\"https:\/\/www.trumonytechs.com\/hu\/what-is-thermal-paste-made-of\/\" aria-label=\"Tov\u00e1bbi inform\u00e1ci\u00f3 err\u0151l: What Is Thermal Paste Made Of?\">Olvass tov\u00e1bb<\/a><\/p>","protected":false},"author":2,"featured_media":37031,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[180],"tags":[],"class_list":["post-37027","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-interface-materials-news"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>What Is Thermal Paste Made Of? - Trumonytechs<\/title>\n<meta name=\"description\" content=\"What is thermal paste made of? 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