{"id":96840,"date":"2025-09-04T08:00:00","date_gmt":"2025-09-04T06:00:00","guid":{"rendered":"https:\/\/www.linseis.com\/?p=96840"},"modified":"2025-12-19T08:56:15","modified_gmt":"2025-12-19T07:56:15","slug":"heat-flow-meter-method-effective-quality-control-of-the-thermal-conductivity-of-insulation-boards-made-of-mineral-wool-and-pu-foam","status":"publish","type":"post","link":"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\/","title":{"rendered":"Heat Flow Meter method: Effective quality control of the thermal conductivity of insulation boards made of mineral wool and PU foam"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"96840\" class=\"elementor elementor-96840 elementor-96780\" data-elementor-post-type=\"post\">\n\t\t\t\t<div class=\"elementor-element elementor-element-b6ac43e e-con-full e-flex e-con e-parent\" data-id=\"b6ac43e\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t<div class=\"elementor-element elementor-element-fef3a69 e-con-full e-flex e-con e-child\" data-id=\"fef3a69\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t<div class=\"elementor-element elementor-element-ae9faca e-con-full e-flex e-con e-child\" data-id=\"ae9faca\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t<div class=\"elementor-element elementor-element-9d32579 e-con-full e-flex e-con e-child\" data-id=\"9d32579\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t<div class=\"elementor-element elementor-element-5751b4c e-con-full e-flex e-con e-child\" data-id=\"5751b4c\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t<div class=\"elementor-element elementor-element-8f2b8e8 e-con-full e-flex e-con e-child\" data-id=\"8f2b8e8\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t<div class=\"elementor-element elementor-element-d272ae1 e-con-full e-flex e-con e-child\" data-id=\"d272ae1\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t<div class=\"elementor-element elementor-element-3631ead e-con-full e-flex e-con e-child\" data-id=\"3631ead\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-a84aac9 elementor-toc--minimized-on-tablet elementor-widget elementor-widget-table-of-contents\" data-id=\"a84aac9\" 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__a84aac9\" 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__a84aac9\" 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__a84aac9\" 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-8288f43 elementor-widget elementor-widget-spacer\" data-id=\"8288f43\" 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-1c5fcc6 elementor-widget elementor-widget-heading\" data-id=\"1c5fcc6\" 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 relevance of the heat flow meter method<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-bcd27c4 elementor-widget elementor-widget-text-editor\" data-id=\"bcd27c4\" 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 <a href=\"https:\/\/www.linseis.com\/en\/instruments\/thermal-conductivity\/hfm-l57\/\"><strong>Heat Flow Meter Method (HFM)<\/strong> <\/a>is based on the fundamental principle of heat transfer through a material. A sample is placed between two plates with defined temperatures &#8211; one with a warm surface and one with a cold surface (1). The resulting temperature difference causes heat to flow through the sample, which is precisely measured using heat flow sensors. The actual measurement takes place under stationary conditions, whereby a constant heat flow is detected.   <\/p><p>The method guarantees high measurement accuracy with typical deviations of less than 2% and is suitable for quality monitoring in the production process of insulation boards. The specific thermal conductivity (\u03bb, measured in W\/(m-K)) is calculated using the Fourier equation: <\/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-c712699 elementor-widget elementor-widget-spacer\" data-id=\"c712699\" 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-df1f95a elementor-widget elementor-widget-text-editor\" data-id=\"df1f95a\" 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>\\(<br \/>\\lambda = \\frac{Q \\cdot d}{A \\cdot \\Delta T}<br \/>\\)<\/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-b448f55 elementor-widget elementor-widget-spacer\" data-id=\"b448f55\" 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-741a45d elementor-widget elementor-widget-text-editor\" data-id=\"741a45d\" 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>Where Q is the heat flow, d is the sample thickness, A is the sample area and \u0394T is the temperature difference.<\/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-4ac7744 elementor-widget elementor-widget-text-editor\" data-id=\"4ac7744\" 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><strong>Measuring procedure in detail:<\/strong><\/p><ul><li>The sample is placed in the measuring device and contacted on both sides by the hot and cold plates<\/li><li>The panels generate a defined temperature profile<\/li><li>The temperature difference and the resulting heat flow are recorded by heat flow sensors<\/li><li>The specific thermal conductivity is calculated<\/li><li>The sample thickness is recorded automatically by high-precision sensors<\/li><\/ul>\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-076a26a elementor-widget elementor-widget-spacer\" data-id=\"076a26a\" 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-d3b5186 elementor-widget elementor-widget-heading\" data-id=\"d3b5186\" 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\">Application in the production process of various 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-64352b6 elementor-widget elementor-widget-heading\" data-id=\"64352b6\" 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\">Mineral wool<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-4e3db4f elementor-widget elementor-widget-text-editor\" data-id=\"4e3db4f\" 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>Mineral wool is characterized by its low thermal conductivity and pronounced anisotropy. The fiber orientation has a significant influence on the thermal conductivity, which is why the measurement method must be validated for different installation positions (2). In the Heat Flow Meter, the <strong><a href=\"https:\/\/www.linseis.com\/en\/properties\/thermal-conductivity\/\">thermal conductivity<\/a> <\/strong>is determined perpendicular to the board direction. In production control, the method provides a fast, non-destructive and repeatable measurement.   <\/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-c0ed860 elementor-widget elementor-widget-heading\" data-id=\"c0ed860\" 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\">Special challenges with mineral wool:<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-804fecb elementor-widget elementor-widget-text-editor\" data-id=\"804fecb\" 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<ul><li>Fiber orientation and binders require pre-treatments such as curing <span style=\"text-decoration: line-through;\">to <\/span>obtain reliable values<\/li><li>Sample geometry and boundary conditions must be precisely adhered to<\/li><li>Anisotropy effects must be taken into account in the direction of the heat flow<\/li><\/ul>\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-b47de36 elementor-widget elementor-widget-heading\" data-id=\"b47de36\" 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\">PU foam<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-aeb6793 elementor-widget elementor-widget-text-editor\" data-id=\"aeb6793\" 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>PU foam is a high-performance insulating material whose thermal conductivity is significantly influenced by various parameters such as density, cell gas composition, moisture and ageing. The thermal conductivity increases slightly with age, as gases diffuse within the cell structure (3). <\/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-11be830 elementor-widget elementor-widget-heading\" data-id=\"11be830\" 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\">Critical factors for PU foam:<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-6316e29 elementor-widget elementor-widget-text-editor\" data-id=\"6316e29\" 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<ul><li>Ageing effects due to gas exchange in the cell structure<\/li><li>Density and moisture content significantly influence measurement results<\/li><li>Measurement under standard conditions (e.g. 10\u00b0C average temperature) guarantees comparability<\/li><li>Long-term behavior is recorded using standardized methods in accordance with EN 13165<\/li><\/ul>\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-d4feb54 elementor-widget elementor-widget-spacer\" data-id=\"d4feb54\" 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-9778195 elementor-widget elementor-widget-image\" data-id=\"9778195\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img fetchpriority=\"high\" decoding=\"async\" width=\"800\" height=\"450\" src=\"https:\/\/www.linseis.com\/wp-content\/uploads\/2025\/09\/173-1024x576.png\" class=\"attachment-large size-large wp-image-96795\" alt=\"\" srcset=\"https:\/\/www.linseis.com\/wp-content\/uploads\/2025\/09\/173-1024x576.png 1024w, https:\/\/www.linseis.com\/wp-content\/uploads\/2025\/09\/173-300x169.png 300w, https:\/\/www.linseis.com\/wp-content\/uploads\/2025\/09\/173-768x432.png 768w, https:\/\/www.linseis.com\/wp-content\/uploads\/2025\/09\/173.png 1140w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/>\t\t\t\t\t\t\t\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-eda5d3c elementor-widget elementor-widget-heading\" data-id=\"eda5d3c\" 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\">Significance for the construction industry and energy efficiency<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-e5a29b8 elementor-widget elementor-widget-text-editor\" data-id=\"e5a29b8\" 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 Heat Flow Meter method offers decisive advantages for the modern construction industry in the quality assurance of insulation materials. An in-process application enables improved production control. This contributes significantly to the quality assurance of insulation materials and the minimization of energy losses in buildings.  <\/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-45f0a2d elementor-widget elementor-widget-heading\" data-id=\"45f0a2d\" 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\">Advantages for the industry:<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-d17d398 elementor-widget elementor-widget-text-editor\" data-id=\"d17d398\" 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 <a href=\"https:\/\/www.linseis.com\/en\/instruments\/thermal-conductivity\/hfm-l57\/\"><strong>HFM method<\/strong><\/a> works in accordance with recognized standards such as EN 12667, EN 13165, ASTM C518 and ISO 8301. The system represents a cost-efficient alternative to more complex measuring methods and is characterized by high precision with low-maintenance operation and short downtimes. The certification conformity supports market access and serves as reliable proof of quality.  <\/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-fa3a4ef elementor-widget elementor-widget-heading\" data-id=\"fa3a4ef\" 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\">Method-specific challenges and their control<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-6b9b644 elementor-widget elementor-widget-text-editor\" data-id=\"6b9b644\" 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 precision of the <a href=\"https:\/\/www.linseis.com\/en\/instruments\/thermal-conductivity\/hfm-l57\/\"><strong>Heat Flow Meter Method<\/strong><\/a>e depends largely on correct sample preparation and execution. Uniform sample surfaces and correct thickness measurement are crucial, as measurement errors in the sample thickness have a direct effect on the measured thermal conductivity (see above: Fourier equation) <\/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-63238e6 elementor-widget elementor-widget-spacer\" data-id=\"63238e6\" 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-bf0616c elementor-widget elementor-widget-text-editor\" data-id=\"bf0616c\" 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><strong>Critical control points:<\/strong><\/p><ul><li>Sample preparation with plane parallelism and homogeneous density<\/li><li>Minimize edge effects by carefully adhering to the sample size<\/li><li>Steady-state equilibrium must be reached before reading the measurement results<\/li><li>Reduce contact resistance between sample and measuring plates<\/li><li>Ensure temperature field homogeneity over the entire sample area<\/li><\/ul><p>Modern HFM systems use Peltier heating and cooling technology, which ensures low downtimes and minimal maintenance. This reduces downtime. <\/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-13b00e8 elementor-widget elementor-widget-heading\" data-id=\"13b00e8\" 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\">Scientific validation and comparability<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-2cab0f9 elementor-widget elementor-widget-text-editor\" data-id=\"2cab0f9\" 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 reliability and precision of the Heat Flow Meter method has been proven by numerous scientific studies. Comparative measurements in the form of round robin tests show deviations of less than 2 % between different laboratories and measuring devices, which underlines the high reproducibility and comparability of the method. Tests on anisotropic and moist samples prove the flexibility of the method, and comparative studies with other measuring methods such as the <a href=\"https:\/\/www.linseis.com\/en\/methods\/guarded-hot-plate-ghp\/\"><strong>Guarded Hot Plate<\/strong><\/a> show a good correlation. In addition, long-term studies document the stability and repeatability of the results. The scientific basis of the HFM method is continuously being expanded through research work that deals with specific material challenges and optimization of the measurement technology. The method has proven to be a reliable tool, particularly when investigating the effects of moisture and ageing.     <\/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-12a1b82 elementor-widget elementor-widget-heading\" data-id=\"12a1b82\" 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<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-9c2458a elementor-widget elementor-widget-text-editor\" data-id=\"9c2458a\" 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 Heat Flow Meter method is an indispensable method for modern quality control of insulation materials. The combination of short measurement time of typically 15 minutes, high accuracy with less than 2% deviation and non-destructive testing makes it the ideal tool for production monitoring of mineral wool and PU foam insulation boards, enabling standard-compliant measurements for certification and proof of quality and providing scientifically validated and reproducible results. At the same time, it offers a cost-effective alternative to more complex testing methods and is versatile for different insulation types and thicknesses. At a time when energy efficiency and sustainable <a href=\"https:\/\/www.linseis.com\/en\/applications\/building-materials\/\"><strong>building materials<\/strong> <\/a>are becoming increasingly important, the Heat Flow Meter method is an essential tool for ensuring material quality. It enables manufacturers to produce high-quality insulation materials and check their thermal conductivity, thereby making an important contribution to reducing energy consumption in buildings.    <\/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-39847ce elementor-widget elementor-widget-spacer\" data-id=\"39847ce\" 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-ca04d0f elementor-widget elementor-widget-text-editor\" data-id=\"ca04d0f\" 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><strong>List of sources<\/strong><\/p><p><span style=\"background-color: transparent;\">(1) TEC-Science: Heat-Flow-Meter Method for the determination of thermal conductivity <\/span><a href=\"https:\/\/www.tec-science.com\/de\/thermodynamik-waermelehre\/waerme\/heat-flow-meter-verfahren-zur-bestimmung-der-warmeleitfahigkeit-hfm\/\" data-auto-event-observed=\"true\" target=\"_blank\" rel=\"noopener\">https:\/\/www.tec-science.com\/de\/thermodynamik-waermelehre\/waerme\/heat-flow-meter-verfahren-zur-bestimmung-der-warmeleitfahigkeit-hfm\/<\/a><\/p><p>(2) PMC: Determination of Thermal Properties of Mineral Wool Required for Fire Behavior Modeling and Structural Applications<\/p><p><a href=\"https:\/\/pmc.ncbi.nlm.nih.gov\/articles\/PMC10488771\/\" data-auto-event-observed=\"true\" target=\"_blank\" rel=\"noopener\">https:\/\/pmc.ncbi.nlm.nih.gov\/articles\/PMC10488771\/<\/a><\/p><p>(3) High Performance Insulation: Thermal insulation materials made of rigid polyurethane foam <a href=\"https:\/\/highperformanceinsulation.eu\/wp-content\/uploads\/2016\/08\/Thermal_insulation_materials_made_of_rigid_polyurethane_foam.pdf\" data-auto-event-observed=\"true\" target=\"_blank\" rel=\"noopener\">https:\/\/highperformanceinsulation.eu\/wp-content\/uploads\/2016\/08\/Thermal_insulation_materials_made_of_rigid_polyurethane_foam.pdf<\/a><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\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>The Heat Flow Meter method (HFM) is based on the fundamental principle of heat transfer through a material. A sample is placed between two plates with defined temperatures &#8211; one with a warm surface and one with a cold surface   <\/p>\n","protected":false},"author":15,"featured_media":96784,"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-96840","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\/96840","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\/15"}],"replies":[{"embeddable":true,"href":"https:\/\/www.linseis.com\/en\/wp-json\/wp\/v2\/comments?post=96840"}],"version-history":[{"count":0,"href":"https:\/\/www.linseis.com\/en\/wp-json\/wp\/v2\/posts\/96840\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.linseis.com\/en\/wp-json\/wp\/v2\/media\/96784"}],"wp:attachment":[{"href":"https:\/\/www.linseis.com\/en\/wp-json\/wp\/v2\/media?parent=96840"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.linseis.com\/en\/wp-json\/wp\/v2\/categories?post=96840"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.linseis.com\/en\/wp-json\/wp\/v2\/tags?post=96840"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}