{"id":116749,"date":"2026-01-09T14:54:06","date_gmt":"2026-01-09T13:54:06","guid":{"rendered":"https:\/\/www.linseis.com\/unkategorisiert\/laser-flash-analyzer-modern-thermal-characterization-of-insulation-materials-in-the-construction-industry\/"},"modified":"2026-01-09T15:04:28","modified_gmt":"2026-01-09T14:04:28","slug":"laser-flash-analyzer-modern-thermal-characterization-of-insulation-materials-in-the-construction-industry","status":"publish","type":"post","link":"https:\/\/www.linseis.com\/en\/wiki\/laser-flash-analyzer-modern-thermal-characterization-of-insulation-materials-in-the-construction-industry\/","title":{"rendered":"Laser Flash Analyzer: Modern thermal characterization of insulation materials in the construction industry"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"116749\" class=\"elementor elementor-116749 elementor-116716\" data-elementor-post-type=\"post\">\n\t\t\t\t<div class=\"elementor-element elementor-element-b75441f e-flex e-con-boxed e-con e-parent\" data-id=\"b75441f\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t<div class=\"elementor-element elementor-element-35d541b e-con-full e-flex e-con e-child\" data-id=\"35d541b\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-97683da elementor-toc--minimized-on-tablet elementor-widget elementor-widget-table-of-contents\" data-id=\"97683da\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;headings_by_tags&quot;:[&quot;h2&quot;],&quot;exclude_headings_by_selector&quot;:[],&quot;no_headings_message&quot;:&quot;No headings were found on this page.&quot;,&quot;marker_view&quot;:&quot;numbers&quot;,&quot;minimize_box&quot;:&quot;yes&quot;,&quot;minimized_on&quot;:&quot;tablet&quot;,&quot;hierarchical_view&quot;:&quot;yes&quot;,&quot;min_height&quot;:{&quot;unit&quot;:&quot;px&quot;,&quot;size&quot;:&quot;&quot;,&quot;sizes&quot;:[]},&quot;min_height_tablet&quot;:{&quot;unit&quot;:&quot;px&quot;,&quot;size&quot;:&quot;&quot;,&quot;sizes&quot;:[]},&quot;min_height_mobile&quot;:{&quot;unit&quot;:&quot;px&quot;,&quot;size&quot;:&quot;&quot;,&quot;sizes&quot;:[]}}\" data-widget_type=\"table-of-contents.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<div class=\"elementor-toc__header\">\n\t\t\t\t\t\t<h4 class=\"elementor-toc__header-title\">\n\t\t\t\tTable of contents\t\t\t<\/h4>\n\t\t\t\t\t\t\t\t\t\t<div class=\"elementor-toc__toggle-button elementor-toc__toggle-button--expand\" role=\"button\" tabindex=\"0\" aria-controls=\"elementor-toc__97683da\" aria-expanded=\"true\" aria-label=\"Open table of contents\"><svg aria-hidden=\"true\" class=\"e-font-icon-svg e-fas-chevron-down\" viewBox=\"0 0 448 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M207.029 381.476L12.686 187.132c-9.373-9.373-9.373-24.569 0-33.941l22.667-22.667c9.357-9.357 24.522-9.375 33.901-.04L224 284.505l154.745-154.021c9.379-9.335 24.544-9.317 33.901.04l22.667 22.667c9.373 9.373 9.373 24.569 0 33.941L240.971 381.476c-9.373 9.372-24.569 9.372-33.942 0z\"><\/path><\/svg><\/div>\n\t\t\t\t<div class=\"elementor-toc__toggle-button elementor-toc__toggle-button--collapse\" role=\"button\" tabindex=\"0\" aria-controls=\"elementor-toc__97683da\" aria-expanded=\"true\" aria-label=\"Close table of contents\"><svg aria-hidden=\"true\" class=\"e-font-icon-svg e-fas-chevron-up\" viewBox=\"0 0 448 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M240.971 130.524l194.343 194.343c9.373 9.373 9.373 24.569 0 33.941l-22.667 22.667c-9.357 9.357-24.522 9.375-33.901.04L224 227.495 69.255 381.516c-9.379 9.335-24.544 9.317-33.901-.04l-22.667-22.667c-9.373-9.373-9.373-24.569 0-33.941L207.03 130.525c9.372-9.373 24.568-9.373 33.941-.001z\"><\/path><\/svg><\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<div id=\"elementor-toc__97683da\" class=\"elementor-toc__body\">\n\t\t\t<div class=\"elementor-toc__spinner-container\">\n\t\t\t\t<svg class=\"elementor-toc__spinner eicon-animation-spin e-font-icon-svg e-eicon-loading\" aria-hidden=\"true\" viewBox=\"0 0 1000 1000\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M500 975V858C696 858 858 696 858 500S696 142 500 142 142 304 142 500H25C25 237 238 25 500 25S975 237 975 500 763 975 500 975Z\"><\/path><\/svg>\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-6854051 elementor-widget elementor-widget-spacer\" data-id=\"6854051\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"spacer.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-spacer\">\n\t\t\t<div class=\"elementor-spacer-inner\"><\/div>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-f563fb9 elementor-widget elementor-widget-text-editor\" data-id=\"f563fb9\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>With increasing demands on energy efficiency and sustainability, the precise characterization of the thermal properties of insulation materials is coming to the fore. The <a href=\"https:\/\/www.linseis.com\/en\/properties\/thermal-diffusivity\/\"><strong>thermal conductivity (\u03bb)<\/strong><\/a> is the key parameter for evaluating the insulation performance &#8211; both when new and over the entire life cycle of a building material. But how reliably can these values be measured and evaluated, especially for modern materials such as polyurethane foams, aerogels or fiber-based insulation materials? The <a href=\"https:\/\/www.linseis.com\/en\/instruments\/thermal-conductivity\/lfa-laser-flash-analyzer\/\"><strong>Laser Flash Method (LFA)<\/strong> <\/a>has established itself as a highly precise and dynamic solution in this field.   <\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-89c0869 elementor-widget elementor-widget-spacer\" data-id=\"89c0869\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"spacer.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-spacer\">\n\t\t\t<div class=\"elementor-spacer-inner\"><\/div>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-f89eb30 elementor-widget elementor-widget-heading\" data-id=\"f89eb30\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Principle and advantages of the Laser Flash Analyzer method<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-36f5a88 elementor-widget elementor-widget-spacer\" data-id=\"36f5a88\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"spacer.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-spacer\">\n\t\t\t<div class=\"elementor-spacer-inner\"><\/div>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-035f339 elementor-widget elementor-widget-text-editor\" data-id=\"035f339\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\tLFA is applied in accordance with international standards such as <a href=\"https:\/\/store.astm.org\/e1461-13r22.html\" target=\"_blank\" rel=\"noopener\"><strong>ASTM E-1461<\/strong><\/a> and <a href=\"https:\/\/www.dinmedia.de\/de\/norm\/din-en-821-2\/3023563\" target=\"_blank\" rel=\"noopener\"><strong>DIN EN 821<\/strong><\/a>. The laser flash method measures the <strong>thermal diffusivity (a)<\/strong> of a mostly disk-shaped sample. A short, intense pulse of energy strikes a sample surface. The temperature increase over time on the opposite side is registered with high precision using an infrared detector (ASTM E1461). The thermal diffusivity can be determined via the temporal temperature profile. With knowledge of <a href=\"https:\/\/www.linseis.com\/en\/wiki\/determination-of-the-cte-density\/\"><strong>density (\u03c1)<\/strong> <\/a>and <a href=\"https:\/\/www.linseis.com\/en\/properties\/specific-heat-capacity\/\"><strong>specific heat capacity (cp)<\/strong><\/a> the conversion to the <a href=\"https:\/\/www.linseis.com\/en\/properties\/thermal-conductivity\/\"><strong>thermal conductivity<\/strong><\/a>:     \n\n$$\n\\lambda(T) = a(T) \\cdot c_p(T) \\cdot \\rho(T)\n$$\n\n\nThe advantages compared to stationary methods such as <a href=\"https:\/\/www.linseis.com\/en\/methods\/guarded-hot-plate-ghp\/\"><strong>Guarded Hot Plate<\/strong><\/a> or <a href=\"https:\/\/www.linseis.com\/en\/methods\/heat-flow-meter-method-hfm\/\"><strong>Heat Flow Meter<\/strong><\/a> are manifold:\n<ul>\n \t<li><strong>Fast, non-destructive measurement<\/strong> with high precision<\/li>\n \t<li><strong>Wide range of materials<\/strong>: <a href=\"https:\/\/www.linseis.com\/en\/applications\/metals-alloys-industry\/\"><strong>Metals<\/strong><\/a>, <a href=\"https:\/\/www.linseis.com\/en\/applications\/polymers\/\"><strong>polymers<\/strong><\/a>, fibers, aerogels<\/li>\n \t<li><strong>Wide temperature range<\/strong>: Modern LFA systems typically cover -100\u00b0C to well over 1,000\u00b0C<\/li>\n \t<li><strong>Small sample quantities<\/strong> and high sample throughputs<\/li>\n<\/ul>\nThe short measurement times minimize unwanted heat losses (radiation, convection), so that precise data is available, especially for thin, lightweight and anisotropic insulation materials such as aerogels and fibrous materials.\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-ac9afd3 elementor-widget elementor-widget-spacer\" data-id=\"ac9afd3\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"spacer.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-spacer\">\n\t\t\t<div class=\"elementor-spacer-inner\"><\/div>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-1b982d6 elementor-widget elementor-widget-heading\" data-id=\"1b982d6\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Focus on materials: polyurethane, aerogels, fibers<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-d51d346 elementor-widget elementor-widget-heading\" data-id=\"d51d346\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">Polyurethane<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-a4a32ba elementor-widget elementor-widget-spacer\" data-id=\"a4a32ba\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"spacer.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-spacer\">\n\t\t\t<div class=\"elementor-spacer-inner\"><\/div>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-5df331d elementor-widget elementor-widget-text-editor\" data-id=\"5df331d\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><a href=\"https:\/\/www.linseis.com\/en\/wiki\/heat-flow-meter-method-effective-quality-control-of-the-thermal-conductivity-of-insulation-boards-made-of-mineral-wool-and-pu-foam\/\"><strong>Polyurethane (PU) foams<\/strong><\/a> show excellent insulation performance with typical \u03bb-values below 0.026 W\/(m-K). Their advantage lies in their fine pore structure, which suppresses gas phase conduction. However, scientific studies by Wagner (University of Stuttgart) show that the thermal conductivity increases slowly over the service life, as the propellant gas in the cells is gradually replaced by air. Laboratory measurements provide reliable temperature dependencies, particularly in the case of moisture absorption or ageing, which is essential for long-term assessment (Wagner, 2010).   <\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-636a704 elementor-widget elementor-widget-spacer\" data-id=\"636a704\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"spacer.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-spacer\">\n\t\t\t<div class=\"elementor-spacer-inner\"><\/div>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-3122b84 elementor-widget elementor-widget-heading\" data-id=\"3122b84\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">Aerogels<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-bead9d0 elementor-widget elementor-widget-spacer\" data-id=\"bead9d0\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"spacer.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-spacer\">\n\t\t\t<div class=\"elementor-spacer-inner\"><\/div>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-e7813c8 elementor-widget elementor-widget-text-editor\" data-id=\"e7813c8\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Aerogels, especially silica and carbon aerogels, are setting new standards in insulation with values of less than 0.015 W\/(m-K), but are also challenging in terms of measurement technology. Porosity, anisotropic structures and high scattering of particle sizes require methods with high spatial and temporal resolution. <\/p><p>In the case of aerogel-based materials, it has been shown that the combination of tests with dried samples and samples exposed to moisture enables a reliable statement to be made about the influence of ageing and moisture input on thermal conductivity. Studies by Lakatos et al. (2025) show that the thermal conductivity of aerogel can initially increase after short-term temperature exposure, but remains remarkably stable under real building conditions (Lakatos et al., 2025).  <\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-b097936 elementor-widget elementor-widget-spacer\" data-id=\"b097936\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"spacer.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-spacer\">\n\t\t\t<div class=\"elementor-spacer-inner\"><\/div>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-95aac46 elementor-widget elementor-widget-heading\" data-id=\"95aac46\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">Fibers<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-6dd2e47 elementor-widget elementor-widget-spacer\" data-id=\"6dd2e47\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"spacer.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-spacer\">\n\t\t\t<div class=\"elementor-spacer-inner\"><\/div>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-a18f69c elementor-widget elementor-widget-text-editor\" data-id=\"a18f69c\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Fiber-based insulation materials (e.g. glass, rock wool-based or natural fibers) benefit from the flexibility typical of LFA. The ability to measure both in-plane and out-of-plane thermal conductivities means that anisotropy (preferential heat flow along the fiber orientation) can also be quantified &#8211; crucial for realistic component evaluations. <\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-a6b66bf elementor-widget elementor-widget-spacer\" data-id=\"a6b66bf\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"spacer.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-spacer\">\n\t\t\t<div class=\"elementor-spacer-inner\"><\/div>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-1443f70 elementor-widget elementor-widget-heading\" data-id=\"1443f70\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">LFA method comparison: When is which measurement method optimal?<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-ac47d19 elementor-widget elementor-widget-spacer\" data-id=\"ac47d19\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"spacer.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-spacer\">\n\t\t\t<div class=\"elementor-spacer-inner\"><\/div>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-7a2ebce elementor-widget elementor-widget-text-editor\" data-id=\"7a2ebce\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>The choice of a suitable measurement method for thermal properties depends heavily on the material, the desired accuracy and the boundary conditions. While stationary methods such as the Guarded Hot Plate (GHP) or Heat Flow Meter (HFM) according to <a href=\"https:\/\/www.dinmedia.de\/de\/norm\/din-en-12664\/33692102\" data-auto-event-observed=\"true\" target=\"_blank\" rel=\"noopener\"><strong>DIN EN 12664<\/strong><\/a> and <a href=\"https:\/\/www.dinmedia.de\/de\/norm\/din-en-12667\/33692201\" data-auto-event-observed=\"true\" target=\"_blank\" rel=\"noopener\"><strong>DIN EN 12667<\/strong><\/a> have their established role in standardized testing, the LFA method shows clear advantages in specific areas of application. <\/p><p><strong>Stationary methods (GHP\/HFM)<\/strong> are particularly suitable for:<\/p><ul><li>Large, homogeneous samples at room temperature<\/li><li>Direct determination of thermal conductivity without additional material parameters<\/li><li>Standard-compliant quality testing for certifications<\/li><li>Materials with very low thermal conductivity (&lt;0.1 W\/(m-K))<\/li><\/ul><p><br><strong>Laser flash analysis<\/strong>, on the other hand, offers decisive advantages:<\/p><ul><li><b>Temperature-dependent measurements:<\/b> LFA covers ranges from -100\u00b0C to over 1000\u00b0C, while GHP\/HFM are mostly limited to 10-70\u00b0C<\/li><li><b>Small sample volumes:<\/b> LFA requires only a few cm\u00b2 of material, ideal for expensive developing materials such as aerogels<\/li><li><b>Fast measurement cycles:<\/b> An LFA measurement takes minutes instead of hours with stationary methods<\/li><li><b>Inhomogeneous or anisotropic materials:<\/b> The ability to measure small samples allows local differences to be detected and directional differences to be tested<\/li><li><b>Ageing studies:<\/b> the high reproducibility enables precise tracking of material changes<\/li><\/ul><p><br>The superiority of the LFA is particularly evident in the characterization of modern insulation materials: while a GHP measurement on an aerogel panel takes several hours and requires large sample areas, the LFA delivers highly precise data in just a few minutes, even from small material samples.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-1dcd72b elementor-widget elementor-widget-spacer\" data-id=\"1dcd72b\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"spacer.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-spacer\">\n\t\t\t<div class=\"elementor-spacer-inner\"><\/div>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-2c36fea elementor-widget elementor-widget-heading\" data-id=\"2c36fea\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Applications in the insulation industry<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-5093464 elementor-widget elementor-widget-spacer\" data-id=\"5093464\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"spacer.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-spacer\">\n\t\t\t<div class=\"elementor-spacer-inner\"><\/div>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-2b2fdfa elementor-widget elementor-widget-text-editor\" data-id=\"2b2fdfa\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>The LFA method is used in many different ways in the insulation industry:<\/p><p><b>Quality control <\/b><strong>in production<\/strong><b>:<\/b> In the industrial production of insulation materials, the LFA method enables a significantly higher test frequency than conventional methods thanks to short measurement times. The rapid feedback on thermal properties allows process fluctuations to be detected and counteracted at an early stage, for example in the event of variations in the blowing agent content of foams. <\/p><p><b>Material development for extreme conditions:<\/b> In the development of high-temperature insulating materials for industrial applications, the advantage of the wide temperature range of LFA becomes apparent. Continuous temperature ramps can reveal critical phase transitions and structural changes that would not be visible with point measurements. This information is essential for the optimization of material formulations.  <\/p><p> <\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-9a9a970 elementor-widget elementor-widget-spacer\" data-id=\"9a9a970\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"spacer.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-spacer\">\n\t\t\t<div class=\"elementor-spacer-inner\"><\/div>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-d9a9969 elementor-widget elementor-widget-heading\" data-id=\"d9a9969\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Reliability of thermal conductivity values over the life cycle<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-559cc27 elementor-widget elementor-widget-spacer\" data-id=\"559cc27\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"spacer.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-spacer\">\n\t\t\t<div class=\"elementor-spacer-inner\"><\/div>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-4f7136e elementor-widget elementor-widget-text-editor\" data-id=\"4f7136e\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>The realistic assessment of insulation performance over decades remains a key challenge. Moisture and ageing in particular can have a significant impact on \u03bb in some cases. The LFA method is sensitive enough to detect even small effects caused by gas diffusion, embrittlement or long-term ageing and thus creates the basis for reliable ageing forecasts:  <\/p><p><b>Moisture load<\/b><\/p><p>Water significantly increases the thermal conductivity, as the pore structure is now filled with a more conductive medium. LFA measurements on material samples under defined climatic conditions make it possible to quantify these effects and thus make a model-based forecast of the long-term insulating effect. <\/p><p><b>Structural changes<\/b><\/p><p>In the case of aerogels, shrinkage after drying, pore enlargement or different proportions of different pore sizes can lead to altered heat conduction properties. The combination of spatially resolved measurement and parallel structural analysis (e.g. SAXS, SEM) sets LFA apart from conventional methods. <\/p><p> <\/p><p> <\/p><p><b>Ageing effects<\/b><\/p><p>Polyurethane can lose its diffusion density over time, which manifests itself in increasing thermal conductivity values. LFA analyses of batches and load series provide robust data for quality assurance purposes. <\/p><p><b>Measurement precision and influencing factors<\/b><\/p><p>The accuracy of the laser flash measurement is determined by various factors:<\/p><ul><li><strong>Specimen thickness and geometry<\/strong>: The exact determination of the specimen thickness is critical, as errors here have a quadratic effect on the result<\/li><li><strong>Surface treatment<\/strong>: Different absorption properties influence the temperature increase and thus the measuring accuracy<\/li><li><strong>Temperature stability<\/strong>: Fluctuations in the sample ambient temperature can lead to measurement uncertainties<\/li><li><strong>Material changes<\/strong>: Ageing effects influence both the actual material values and the reproducibility of the measurements<\/li><\/ul><p><br>By controlling and documenting these factors, the laser flash method can also guarantee the highest accuracy and reliability for life cycle analyses of insulation materials.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-08989f3 elementor-widget elementor-widget-spacer\" data-id=\"08989f3\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"spacer.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-spacer\">\n\t\t\t<div class=\"elementor-spacer-inner\"><\/div>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-efdf12b elementor-widget elementor-widget-heading\" data-id=\"efdf12b\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Conclusion: LFA as the key to life cycle assessment of modern insulation materials<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-88cbda8 elementor-widget elementor-widget-spacer\" data-id=\"88cbda8\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"spacer.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-spacer\">\n\t\t\t<div class=\"elementor-spacer-inner\"><\/div>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-ad8a5ed elementor-widget elementor-widget-text-editor\" data-id=\"ad8a5ed\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>The Laser Flash Analyzer method provides fast, high-resolution and precise experimental data on the thermal conductivity of a wide range of insulation materials, making it the ideal tool not only for material development, but also for predicting service life in the construction industry. <a href=\"https:\/\/www.linseis.com\/en\/applications\/building-materials\/\"><strong>construction industry<\/strong><\/a>. In combination with structural analysis methods and cyclical ageing tests, LFA-supported measurement technology opens up new possibilities for quality assurance and optimization of energy-efficient building products in laboratory and research practice. <\/p><p>Scientific evidence shows that the long-term stability of the different material classes varies: While polyurethane shows a slight but predictable increase in thermal conductivity over decades, high-quality aerogels exhibit extreme long-term stability under normal conditions of use. The LFA method makes it possible to precisely quantify these ageing processes and thus create a reliable basis for sustainable construction planning. <\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-0a09b8b elementor-widget elementor-widget-spacer\" data-id=\"0a09b8b\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"spacer.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-spacer\">\n\t\t\t<div class=\"elementor-spacer-inner\"><\/div>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-d311197 elementor-widget elementor-widget-heading\" data-id=\"d311197\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">References<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-bc5a2c1 elementor-widget elementor-widget-spacer\" data-id=\"bc5a2c1\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"spacer.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-spacer\">\n\t\t\t<div class=\"elementor-spacer-inner\"><\/div>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-7ec0ae5 elementor-widget elementor-widget-text-editor\" data-id=\"7ec0ae5\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<ol><li>ASTM E1461: Standard Test Method for Thermal Diffusivity by the Flash Method. ASTM International. <\/li><li>Wagner, K. (2010): Simulation and optimization of the thermal insulation capacity of closed-cell PUR rigid foams. Dissertation, University of Stuttgart. Online: <a href=\"https:\/\/elib.uni-stuttgart.de\" target=\"_blank\" rel=\"noopener\">https:\/\/elib.uni-stuttgart.de<\/a>  <\/li><li>Heinemann, U. et al. (2020): Long-Term Performance of Super-Insulating Materials in Building Applications. IEA-EBC Annex 65, Subtask I State-of-the-Art Report.  <\/li><li>Lakatos, \u00c1. et al. (2025): Identifying the alteration in the thermal properties of aerogel materials. ScienceDirect. Online: <a href=\"https:\/\/www.sciencedirect.com\" target=\"_blank\" rel=\"noopener\">https:\/\/www.sciencedirect.com<\/a>    <\/li><\/ol>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-cec7d2c elementor-widget elementor-widget-spacer\" data-id=\"cec7d2c\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"spacer.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-spacer\">\n\t\t\t<div class=\"elementor-spacer-inner\"><\/div>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>With increasing requirements for energy efficiency and sustainability, the precise characterization of thermal parameters of insulation materials is coming to the fore. Thermal conductivity (\u03bb) is the key parameter for evaluating the insulation performance &#8211; both when new and over the entire life cycle of a building material.   <\/p>\n","protected":false},"author":3,"featured_media":116720,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"inline_featured_image":false,"footnotes":""},"categories":[106],"tags":[],"class_list":["post-116749","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-wiki"],"acf":[],"_links":{"self":[{"href":"https:\/\/www.linseis.com\/en\/wp-json\/wp\/v2\/posts\/116749","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.linseis.com\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.linseis.com\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.linseis.com\/en\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/www.linseis.com\/en\/wp-json\/wp\/v2\/comments?post=116749"}],"version-history":[{"count":0,"href":"https:\/\/www.linseis.com\/en\/wp-json\/wp\/v2\/posts\/116749\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.linseis.com\/en\/wp-json\/wp\/v2\/media\/116720"}],"wp:attachment":[{"href":"https:\/\/www.linseis.com\/en\/wp-json\/wp\/v2\/media?parent=116749"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.linseis.com\/en\/wp-json\/wp\/v2\/categories?post=116749"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.linseis.com\/en\/wp-json\/wp\/v2\/tags?post=116749"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}