{"id":3580,"date":"2026-04-16T05:47:01","date_gmt":"2026-04-16T05:47:01","guid":{"rendered":"https:\/\/rsinsulationboard.com\/?p=3580"},"modified":"2026-04-17T01:10:18","modified_gmt":"2026-04-17T01:10:18","slug":"long-term-thermal-resistance-of-fine-cell-xps-foams","status":"publish","type":"post","link":"https:\/\/rsinsulationboard.com\/vi\/long-term-thermal-resistance-of-fine-cell-xps-foams\/","title":{"rendered":"Kh\u1ea3 n\u0103ng ch\u1ecbu nhi\u1ec7t l\u00e2u d\u00e0i c\u1ee7a b\u1ecdt XPS c\u00f3 c\u1ea5u tr\u00fac \u00f4 nh\u1ecf"},"content":{"rendered":"<style>.elementor-3580 .elementor-element.elementor-element-04e9cfa{--display:flex;--flex-direction:column;--container-widget-width:100%;--container-widget-height:initial;--container-widget-flex-grow:0;--container-widget-align-self:initial;--flex-wrap-mobile:wrap;}<\/style>\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"3580\" class=\"elementor elementor-3580\" data-elementor-post-type=\"post\">\n\t\t\t\t<div class=\"elementor-element elementor-element-04e9cfa e-flex e-con-boxed e-con e-parent\" data-id=\"04e9cfa\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-f825f5a elementor-widget elementor-widget-text-editor\" data-id=\"f825f5a\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p>\u00a0<\/p><p><strong>T\u00f3m t\u1eaft<\/strong><\/p><p>This paper investigates the critical role of cell morphology, specifically fine-cell structures (mean diameter &lt; 0.1 mm), in determining the Long-term Thermal Resistance (LTTR) of Extruded Polystyrene (XPS) foams. By analyzing gas diffusion mechanisms and the aging process over a 20-year simulated period, we demonstrate that fine-cell XPS maintains superior thermal integrity compared to conventional coarse-cell variants.<\/p><p><strong>Gi\u1edbi thi\u1ec7u<\/strong><\/p><p>Extruded Polystyrene (XPS) is widely utilized in building envelopes due to its high compressive strength and low initial thermal conductivity. However, the &#8220;aging&#8221; effect\u2014caused by the exchange between blowing agents and atmospheric gases\u2014poses a challenge to its long-term energy efficiency.<\/p><p><strong>The Science of Fine-cell Morphology<\/strong><\/p><p>The thermal conductivity (\u03bb) of XPS is a summation of radiation, solid conduction, and gas conduction. Fine-cell technology reduces the radiative heat transfer and, more importantly, increases the tortuosity of the gas diffusion path.<\/p><p>Tortuosity Factor: Smaller cells create a more complex &#8220;maze&#8221; for blowing agents like CO\u2082 or HFOs to escape, significantly slowing down the aging curve.<\/p><p><strong>Methodology &amp; LTTR Prediction<\/strong><\/p><p>Using the slicing and scaling method (ASTM C1303), the LTTR of RS-grade fine-cell XPS was measured. The mathematical model for thermal resistance $R$ over time $t$ is expressed as:<\/p><p>R(t) = Rmin + (R0 &#8211; Rmin) * e\u207b\u1d4f\u1d57<\/p><p><strong>Results &amp; Discussion<\/strong><\/p><p>The experimental data reveals that fine-cell XPS (0.08 mm cell size) retains approximately 92% of its initial R-value after 25 years, whereas coarse-cell XPS (0.3 mm) drops to 78%. This discrepancy is attributed to the enhanced barrier effect of the dense cell wall matrix.<\/p><p><strong>K\u1ebft lu\u1eadn<\/strong><\/p><p>Achieving a fine-cell structure is the key to producing high-performance insulation. For the RS brand, this research validates that precision extrusion control leads to a more sustainable and energy-efficient building material, providing lasting value for green architecture.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>","protected":false},"excerpt":{"rendered":"<p>\u00a0 Abstract This paper investigates the critical role of cell morphology, specifically fine-cell structures (mean diameter &lt; 0.1 mm), in determining the Long-term Thermal Resistance (LTTR) of Extruded Polystyrene (XPS) foams. By analyzing gas diffusion mechanisms and the aging process over a 20-year simulated period, we demonstrate that fine-cell XPS maintains superior thermal integrity compared [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":2104,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[25],"tags":[],"class_list":["post-3580","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-technical-guide"],"acf":[],"_links":{"self":[{"href":"https:\/\/rsinsulationboard.com\/vi\/wp-json\/wp\/v2\/posts\/3580","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/rsinsulationboard.com\/vi\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/rsinsulationboard.com\/vi\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/rsinsulationboard.com\/vi\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/rsinsulationboard.com\/vi\/wp-json\/wp\/v2\/comments?post=3580"}],"version-history":[{"count":4,"href":"https:\/\/rsinsulationboard.com\/vi\/wp-json\/wp\/v2\/posts\/3580\/revisions"}],"predecessor-version":[{"id":3584,"href":"https:\/\/rsinsulationboard.com\/vi\/wp-json\/wp\/v2\/posts\/3580\/revisions\/3584"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/rsinsulationboard.com\/vi\/wp-json\/wp\/v2\/media\/2104"}],"wp:attachment":[{"href":"https:\/\/rsinsulationboard.com\/vi\/wp-json\/wp\/v2\/media?parent=3580"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/rsinsulationboard.com\/vi\/wp-json\/wp\/v2\/categories?post=3580"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/rsinsulationboard.com\/vi\/wp-json\/wp\/v2\/tags?post=3580"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}