{"id":2686,"date":"2024-08-12T17:52:56","date_gmt":"2024-08-12T17:52:56","guid":{"rendered":"https:\/\/incurelab.com\/wp\/?p=2686"},"modified":"2026-08-27T06:37:28","modified_gmt":"2026-08-27T06:37:28","slug":"thermally-conductive-epoxies","status":"publish","type":"post","link":"https:\/\/incurelab.com\/wp\/thermally-conductive-epoxies","title":{"rendered":"Thermally Conductive Epoxy Adhesive for Extreme Conditions: Incure Epo-Weld\u2122 TC-9042"},"content":{"rendered":"<p>A heat sink only works if heat can actually reach it. An air gap or a low-conductivity adhesive at the interface throttles the whole thermal path. Incure Epo-Weld\u2122 TC-9042 is a two-part epoxy that moves heat across the joint while surviving temperatures that defeat most thermal adhesives.<\/p>\n<h3>What TC-9042 is<\/h3>\n<p>Epo-Weld\u2122 TC-9042 is an aluminum-filled, two-component thermally conductive epoxy for bonding and potting. The metal filler raises the bulk thermal conductivity of the cured matrix so the adhesive conducts heat from a component into a sink or chassis instead of insulating it. Its service range extends to roughly -60\u00b0C to 300\u00b0C (-76\u00b0F to 572\u00b0F), which is wider than typical thermal epoxies and lets it work in exhaust-adjacent, downhole, and furnace-adjacent locations.<\/p>\n<p>TC-9042 is thermally conductive but is not formulated as an electrical insulator; where a component must be both heat-coupled and electrically isolated, use the aluminum-nitride-filled TC-9051 instead.<\/p>\n<h3>Key properties and why they matter<\/h3>\n<ul>\n<li><strong>Thermal conductivity across the bond line.<\/strong> The relevant figure is the conductivity of the adhesive multiplied by the contact area and divided by the bond line thickness. A thinner, void-free joint of conductive epoxy dramatically lowers thermal resistance.<\/li>\n<li><strong>Wide temperature range.<\/strong> Holding properties to about 300\u00b0C means TC-9042 does not become the weak link in equipment that already runs hot.<\/li>\n<li><strong>Chemical resistance.<\/strong> The cured matrix resists solvents, fuels, and dilute acids and bases.<\/li>\n<li><strong>Bonding and potting in one product.<\/strong> You can attach a heat sink and encapsulate the surrounding electronics with the same qualified material.<\/li>\n<\/ul>\n<h3>Where TC-9042 fits<\/h3>\n<ul>\n<li><strong>Aerospace and defense:<\/strong> bonding heat sinks and cold plates on avionics that see wide thermal swings.<\/li>\n<li><strong>Automotive and transportation:<\/strong> attaching power electronics and sensors in engine-bay and exhaust-adjacent locations.<\/li>\n<li><strong>Industrial power conversion:<\/strong> potting and bonding rectifiers, drives, and controllers that dissipate significant heat.<\/li>\n<li><strong>Oil and gas:<\/strong> thermal management for downhole and surface electronics exposed to high ambient temperatures.<\/li>\n<li><strong>Furnace and oven instrumentation:<\/strong> bonding sensor packages that must shed self-heating while sitting in a hot enclosure.<\/li>\n<\/ul>\n<h3>Getting the thermal path right<\/h3>\n<ul>\n<li><strong>Keep the bond line thin.<\/strong> Thermal resistance is proportional to thickness. Use just enough adhesive to fill the gap and wet both surfaces; excess adhesive squeezed into a thick layer defeats the purpose.<\/li>\n<li><strong>Eliminate voids.<\/strong> An air pocket is a local hot spot. Apply the adhesive in a pattern that pushes air out as the parts close, rather than trapping it in the center.<\/li>\n<li><strong>Flatten and clean the mating faces.<\/strong> High points carry all the load and leave the rest of the interface starved.<\/li>\n<li><strong>Plan for expansion.<\/strong> A rigid conductive joint between a silicon device and a metal sink is loaded every thermal cycle. This guide to <a href=\"https:\/\/incurelab.com\/wp\/how-cte-mismatch-causes-adhesive-bond-failure\">how CTE mismatch causes adhesive bond failure<\/a> explains how to manage that stress.<\/li>\n<\/ul>\n<p>If you want help estimating the thermal resistance of a proposed joint, <a href=\"mailto:support@incurelab.com\">Email Us<\/a> with the die size, power dissipation, and sink details.<\/p>\n<h3>Surface preparation, mixing, and cure<\/h3>\n<p>Degrease and abrade metal surfaces, then wipe clean and dry. Meter the two parts at the specified ratio and mix until fully uniform; the filler makes streaking easy to miss, so mix longer than you think you need. TC-9042 develops full temperature resistance through an elevated-temperature cure, so follow the recommended ramp and hold. Under-curing leaves the matrix weak and it will lose strength early in service.<\/p>\n<h3>Failure modes and prevention<\/h3>\n<ul>\n<li><strong>Higher-than-expected junction temperature:<\/strong> the bond line is too thick or full of voids. Reduce adhesive volume and improve the application pattern.<\/li>\n<li><strong>Delamination after thermal cycling:<\/strong> CTE mismatch with a rigid joint. Reduce bond area, control the gap, and consider a slightly more compliant grade.<\/li>\n<li><strong>Soft cured adhesive:<\/strong> off-ratio or incomplete mixing, or a short cure. Use calibrated dispensing and verify the oven profile.<\/li>\n<li><strong>Grit or filler settling:<\/strong> stir the part containers before dispensing if they have been stored for a while.<\/li>\n<\/ul>\n<h3>Measuring whether the joint works<\/h3>\n<p>The way to know a thermal joint is performing is to measure it, not to assume it. On a representative assembly, run the component at its rated power and record the case temperature and the sink temperature once they stabilize. Dividing the temperature difference by the dissipated power gives the thermal resistance of the path, which you can compare against your design target. A result well above target usually means a thick or voided bond line; pull a failed sample apart and inspect the fracture surface for dry spots and trapped air. Repeat the check after a few hundred thermal cycles, since a joint that starts well can degrade if CTE stress is opening a gap at the edges.<\/p>\n<h3>Storage and mixed working life<\/h3>\n<p>Keep both components sealed and cool, and stir the filled part before dispensing if it has been stored for weeks, because the metal filler slowly settles. Mixed working life shortens in a warm shop and with larger batch sizes; mix only what you can apply before the pot begins to thicken.<\/p>\n<h3>How TC-9042 compares<\/h3>\n<p>Choose TC-9042 when you need heat transfer plus a wide, high temperature range and electrical isolation is not required. Choose TC-9051 when the joint must also be a dielectric barrier, or TC-9033 when you want a general-purpose thermally conductive grade with broad substrate coverage at more moderate temperatures. For thin emissive films that radiate heat off a hot surface rather than conducting it into a sink, see the <a href=\"https:\/\/incurelab.com\/wp\/epo-weld-hecc-high-emissive-ceramic-coatings-by-substrate-and-service-temperature\">high emissive ceramic coatings<\/a>.<\/p>\n<h3>Next steps<\/h3>\n<p>The right grade depends on your power levels, temperatures, isolation requirements, and cure capability. Incure&#8217;s technical team can review your thermal design and recommend a grade and process. <a href=\"https:\/\/www.incurelab.com\/contact\">Contact Our Team<\/a> to get started.<\/p>\n<p>Visit <a href=\"https:\/\/www.incurelab.com\">www.incurelab.com<\/a> for more information.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>A heat sink only works if heat can actually reach it. An air gap or a low-conductivity adhesive at the interface throttles the whole thermal path. Incure Epo-Weld\u2122 TC-9042 is a two-part epoxy that moves heat across the joint while surviving temperatures that defeat most thermal adhesives. What TC-9042 is Epo-Weld\u2122 TC-9042 is an aluminum-filled, [&hellip;]<\/p>\n","protected":false},"author":9,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"ocean_front_end_style_editor":"no","ocean_post_layout":"","ocean_both_sidebars_style":"","ocean_both_sidebars_content_width":0,"ocean_both_sidebars_sidebars_width":0,"ocean_sidebar":"","ocean_second_sidebar":"","ocean_disable_margins":"enable","ocean_add_body_class":"","ocean_shortcode_before_top_bar":"","ocean_shortcode_after_top_bar":"","ocean_shortcode_before_header":"","ocean_shortcode_after_header":"","ocean_has_shortcode":"","ocean_shortcode_after_title":"","ocean_shortcode_before_footer_widgets":"","ocean_shortcode_after_footer_widgets":"","ocean_shortcode_before_footer_bottom":"","ocean_shortcode_after_footer_bottom":"","ocean_display_top_bar":"default","ocean_display_header":"default","ocean_header_style":"","ocean_center_header_left_menu":"","ocean_custom_header_template":"","ocean_custom_logo":0,"ocean_custom_retina_logo":0,"ocean_custom_logo_max_width":0,"ocean_custom_logo_tablet_max_width":0,"ocean_custom_logo_mobile_max_width":0,"ocean_custom_logo_max_height":0,"ocean_custom_logo_tablet_max_height":0,"ocean_custom_logo_mobile_max_height":0,"ocean_header_custom_menu":"","ocean_menu_typo_font_family":"","ocean_menu_typo_font_subset":"","ocean_menu_typo_font_size":0,"ocean_menu_typo_font_size_tablet":0,"ocean_menu_typo_font_size_mobile":0,"ocean_menu_typo_font_size_unit":"px","ocean_menu_typo_font_weight":"","ocean_menu_typo_font_weight_tablet":"","ocean_menu_typo_font_weight_mobile":"","ocean_menu_typo_transform":"","ocean_menu_typo_transform_tablet":"","ocean_menu_typo_transform_mobile":"","ocean_menu_typo_line_height":0,"ocean_menu_typo_line_height_tablet":0,"ocean_menu_typo_line_height_mobile":0,"ocean_menu_typo_line_height_unit":"","ocean_menu_typo_spacing":0,"ocean_menu_typo_spacing_tablet":0,"ocean_menu_typo_spacing_mobile":0,"ocean_menu_typo_spacing_unit":"","ocean_menu_link_color":"","ocean_menu_link_color_hover":"","ocean_menu_link_color_active":"","ocean_menu_link_background":"","ocean_menu_link_hover_background":"","ocean_menu_link_active_background":"","ocean_menu_social_links_bg":"","ocean_menu_social_hover_links_bg":"","ocean_menu_social_links_color":"","ocean_menu_social_hover_links_color":"","ocean_disable_title":"default","ocean_disable_heading":"default","ocean_post_title":"","ocean_post_subheading":"","ocean_post_title_style":"","ocean_post_title_background_color":"","ocean_post_title_background":0,"ocean_post_title_bg_image_position":"","ocean_post_title_bg_image_attachment":"","ocean_post_title_bg_image_repeat":"","ocean_post_title_bg_image_size":"","ocean_post_title_height":0,"ocean_post_title_bg_overlay":0.5,"ocean_post_title_bg_overlay_color":"","ocean_disable_breadcrumbs":"default","ocean_breadcrumbs_color":"","ocean_breadcrumbs_separator_color":"","ocean_breadcrumbs_links_color":"","ocean_breadcrumbs_links_hover_color":"","ocean_display_footer_widgets":"default","ocean_display_footer_bottom":"default","ocean_custom_footer_template":"","ocean_post_oembed":"","ocean_post_self_hosted_media":"","ocean_post_video_embed":"","ocean_link_format":"","ocean_link_format_target":"self","ocean_quote_format":"","ocean_quote_format_link":"post","ocean_gallery_link_images":"on","ocean_gallery_id":[],"footnotes":""},"categories":[347],"tags":[],"class_list":["post-2686","post","type-post","status-publish","format-standard","hentry","category-epoxy","entry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Thermally Conductive Epoxy Adhesive for Extreme Conditions: Incure Epo-Weld\u2122 TC-9042 - INCURE INC.<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/incurelab.com\/wp\/thermally-conductive-epoxies\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Thermally Conductive Epoxy Adhesive for Extreme Conditions: Incure Epo-Weld\u2122 TC-9042 - INCURE INC.\" \/>\n<meta property=\"og:description\" content=\"A heat sink only works if heat can actually reach it. 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