{"id":9653,"date":"2025-09-02T16:07:05","date_gmt":"2025-09-02T14:07:05","guid":{"rendered":"https:\/\/www.adesiviesigillanti.it\/?page_id=9653"},"modified":"2025-09-06T17:12:29","modified_gmt":"2025-09-06T15:12:29","slug":"3-sika","status":"publish","type":"page","link":"https:\/\/www.adesiviesigillanti.it\/en\/archive\/archive-2025\/issue-3-2025\/3-sika\/","title":{"rendered":"3-SIKA"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-page\" data-elementor-id=\"9653\" class=\"elementor elementor-9653 elementor-9345\">\n\t\t\t\t<div class=\"elementor-element elementor-element-6964fe9 e-flex e-con-boxed e-con e-parent\" data-id=\"6964fe9\" data-element_type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t<div class=\"elementor-element elementor-element-34f62b8 e-con-full e-flex e-con e-child\" data-id=\"34f62b8\" data-element_type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-1b22916 elementor-widget elementor-widget-heading\" data-id=\"1b22916\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h1 class=\"elementor-heading-title elementor-size-default\">Overcoming the bonding challenge\nof polypropylene in industrial manufacturing<\/h1>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-3153df1 elementor-widget elementor-widget-text-editor\" data-id=\"3153df1\" data-element_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<h5 style=\"text-align: center\"><span style=\"color: #000000\"><strong>David Tobler<br \/>SIKA<\/strong><\/span><\/h5>\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-3faa00d elementor-widget elementor-widget-image\" data-id=\"3faa00d\" data-element_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=\"768\" height=\"348\" src=\"https:\/\/www.adesiviesigillanti.it\/wp-content\/uploads\/2025\/09\/3_SIKA-FIG-2-768x348.png\" class=\"attachment-medium_large size-medium_large wp-image-9350 no-lazyload\" alt=\"\" srcset=\"https:\/\/www.adesiviesigillanti.it\/wp-content\/uploads\/2025\/09\/3_SIKA-FIG-2-768x348.png 768w, https:\/\/www.adesiviesigillanti.it\/wp-content\/uploads\/2025\/09\/3_SIKA-FIG-2-300x136.png 300w, https:\/\/www.adesiviesigillanti.it\/wp-content\/uploads\/2025\/09\/3_SIKA-FIG-2.png 1024w\" sizes=\"(max-width: 768px) 100vw, 768px\" \/>\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-73b941a elementor-widget elementor-widget-text-editor\" data-id=\"73b941a\" data-element_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 class=\"p1\">As polypropylene becomes increasingly common in commercial vehicle construction\u2014especially in lightweight interior panels\u2014many smaller and mid-sized manufacturers face bonding challenges that large OEMs solve with automated surface treatments. This growing demand has led to the development of a new adhesive\u00a0system specifically tailored for manual processing, providing a practical alternative for those working without\u00a0plasma or flame equipment.<br \/>Polypropylene (PP) is widely appreciated for its low density, chemical resistance, and mechanical properties\u2014qualities that make it an ideal material in automotive, transport, and appliance manufacturing.<br \/>However, these very advantages also pose a unique challenge: polypropylene is notoriously difficult to bond with adhesives due to its low surface energy, typically below 30 dyn\/cm. This makes the surface &#8220;non-stick&#8221; for most conventional adhesives.<\/p><figure id=\"attachment_9347\" aria-describedby=\"caption-attachment-9347\" style=\"width: 961px\" class=\"wp-caption aligncenter\"><img decoding=\"async\" class=\"wp-image-9347 size-full no-lazyload\" src=\"https:\/\/www.adesiviesigillanti.it\/wp-content\/uploads\/2025\/09\/3_SIKA-FIG-1.png\" alt=\"\" width=\"961\" height=\"489\" srcset=\"https:\/\/www.adesiviesigillanti.it\/wp-content\/uploads\/2025\/09\/3_SIKA-FIG-1.png 961w, https:\/\/www.adesiviesigillanti.it\/wp-content\/uploads\/2025\/09\/3_SIKA-FIG-1-300x153.png 300w, https:\/\/www.adesiviesigillanti.it\/wp-content\/uploads\/2025\/09\/3_SIKA-FIG-1-768x391.png 768w\" sizes=\"(max-width: 961px) 100vw, 961px\" \/><figcaption id=\"caption-attachment-9347\" class=\"wp-caption-text\">Plasma and flame treatment as physical surface treatment methods<\/figcaption><\/figure><p><strong><span style=\"color: #f0d30a\">WHY POLYPROPYLENE IS DIFFICULT TO BOND<\/span><\/strong><\/p><p class=\"p1\">At a molecular level, the lack of polar functional groups and the hydrophobic, non-polar nature of PP&#8217;s surface prevent the formation of strong adhesive bonds. As a result, adhesives tend to sit on the surface rather than form lasting chemical or mechanical links. This makes untreated PP a poor candidate for structural bonding applications unless the surface is modified.<\/p><p><strong><span style=\"color: #f0d30a\">PHYSICAL SURFACE TREATMENT: THE STANDARD APPROACH<\/span><\/strong><\/p><p class=\"p1\">To enable adhesive bonding, PP surfaces are traditionally modified through physical surface treatments. The most commonly used techniques are:<\/p><p class=\"p1\">&#8211; flame treatment: An oxidizing flame is applied to the surface, increasing surface energy and introducing polar groups. This is widely used in high-through put production.<\/p><p class=\"p1\">&#8211; Plasma treatment: Plasma ionizes the gas near the surface, creating free radicals that react with the polymer and alter its chemical composition. It offers more control and is effective on complex geometries.<br \/>These methods significantly enhance adhesion performance but require capital investment, process control, and in most cases, are limited to automated, high-volume manufacturing environments (e.g., automotive OEMs, appliance manufacturers).<\/p><p><img decoding=\"async\" class=\"wp-image-9351 size-full no-lazyload\" style=\"font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, 'Noto Sans', sans-serif, 'Apple Color Emoji', 'Segoe UI Emoji', 'Segoe UI Symbol', 'Noto Color Emoji'\" src=\"https:\/\/www.adesiviesigillanti.it\/wp-content\/uploads\/2025\/09\/3_SIKA-FIG-3.png\" alt=\"\" width=\"1024\" height=\"483\" srcset=\"https:\/\/www.adesiviesigillanti.it\/wp-content\/uploads\/2025\/09\/3_SIKA-FIG-3.png 1024w, https:\/\/www.adesiviesigillanti.it\/wp-content\/uploads\/2025\/09\/3_SIKA-FIG-3-300x142.png 300w, https:\/\/www.adesiviesigillanti.it\/wp-content\/uploads\/2025\/09\/3_SIKA-FIG-3-768x362.png 768w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/p>Test results on Monopan PP \/ T0.7 O\/O<p><strong><span style=\"color: #f0d30a\">CHALLENGES FOR LOW-VOLUME AND MANUAL MANUFACTURING<\/span><\/strong><\/p><p class=\"p1\">Small- to mid-size manufacturers &#8211; such as RV builders, last-mile vehicle upfitters, and specialty cargo van producers &#8211; often work in lower volumes and rely on manual or semi-automated processes. For them, implementing flame or plasma treatment is frequently not viable due to:<\/p><p class=\"p1\">&#8211; high equipment cost.<\/p><p class=\"p1\">&#8211; Need for operator training.<\/p><p class=\"p1\">&#8211; Process variability in non-controlled environments.<\/p><p class=\"p1\">&#8211; Safety and environmental concerns.<\/p><p class=\"p1\">As a result, these manufacturers face a &#8216;bottleneck&#8217; when it comes to reliably bonding PP panels without investing in costly pre-treatment infrastructure.<\/p><p style=\"text-align: left\"><strong><span style=\"color: #f0d30a\">CHEMICAL PRIMING AS A PRACTICAL ALTERNATIVE<\/span><\/strong><\/p><p class=\"p1\">For these more flexible production environments, chemical adhesion promoters offer a viable alternative to physical surface activation. In particular, recent developments have focused on solvent-based primers designed for use on glass fiber reinforced PP substrates, which are commonly found in lightweight honeycomb panels used for transport interiors and the construction of cargo vans.<\/p><figure id=\"attachment_9353\" aria-describedby=\"caption-attachment-9353\" style=\"width: 1069px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-9353 size-full no-lazyload\" src=\"https:\/\/www.adesiviesigillanti.it\/wp-content\/uploads\/2025\/09\/3_SIKA-FIG-4.png\" alt=\"\" width=\"1069\" height=\"489\" srcset=\"https:\/\/www.adesiviesigillanti.it\/wp-content\/uploads\/2025\/09\/3_SIKA-FIG-4.png 1069w, https:\/\/www.adesiviesigillanti.it\/wp-content\/uploads\/2025\/09\/3_SIKA-FIG-4-300x137.png 300w, https:\/\/www.adesiviesigillanti.it\/wp-content\/uploads\/2025\/09\/3_SIKA-FIG-4-1024x468.png 1024w, https:\/\/www.adesiviesigillanti.it\/wp-content\/uploads\/2025\/09\/3_SIKA-FIG-4-768x351.png 768w\" sizes=\"(max-width: 1069px) 100vw, 1069px\" \/><figcaption id=\"caption-attachment-9353\" class=\"wp-caption-text\">Adhesion peel test results on different PP materials with different adhesives after treatment<br \/>with Sika<span class=\"s1\">\u00ae <\/span>Primer-518 PP<\/figcaption><\/figure><p class=\"p1\">One such system combines Sika<span class=\"s1\">\u00ae <\/span>Primer-518 PP with Sikaflex<span class=\"s1\">\u00ae<\/span>-500 Series, STP (Silane-Terminated Polymer) adhesives.<br \/>This combination has demonstrated reliable adhesion on untreated PP-GF panels without the need for flame or plasma treatment. It is designed for manual application, with short flash-off times and the option for process control via UV detection, enabling repeatability in workshop conditions.<br \/>Mechanical testing\u2014such as lap shear and torsional strength\u2014indicates that the bond performance achieved with this primer-adhesive system is sufficient for many noncritical and semi-structural applications in transportation manufacturing.<br \/>The picture in Figure 4 shows consistently good results of adhesion peel tests on various polypropylene substrates throughout the aging cycle.<\/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-f66b61a elementor-widget-divider--view-line elementor-widget elementor-widget-divider\" data-id=\"f66b61a\" data-element_type=\"widget\" data-widget_type=\"divider.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-divider\">\n\t\t\t<span class=\"elementor-divider-separator\">\n\t\t\t\t\t\t<\/span>\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-6dc7001 elementor-widget elementor-widget-text-editor\" data-id=\"6dc7001\" data-element_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<h5 style=\"text-align: center\"><a href=\"https:\/\/www.adesiviesigillanti.it\/wp-content\/uploads\/2025\/09\/Sika-3-25.pdf\"><strong><span style=\"color: #f0d30a\">DOWNLOAD THE PDF FILE<\/span><\/strong><\/a><\/h5>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-454ecf82 e-con-full e-flex e-con e-child\" data-id=\"454ecf82\" data-element_type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-600e3aaf elementor-widget__width-inherit elementor-widget elementor-widget-heading\" data-id=\"600e3aaf\" data-element_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\">Other contents<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-7613a022 elementor-widget-divider--view-line elementor-widget elementor-widget-divider\" data-id=\"7613a022\" data-element_type=\"widget\" data-widget_type=\"divider.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-divider\">\n\t\t\t<span class=\"elementor-divider-separator\">\n\t\t\t\t\t\t<\/span>\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-1060b7db elementor-widget elementor-widget-heading\" data-id=\"1060b7db\" data-element_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\"><a href=\"https:\/\/www.adesiviesigillanti.it\/en\/archive\/archive-2025\/issue-3-2025\/1-kaneka\/\">KANEKA BELGIUM NV<\/a><\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-63cd6637 elementor-widget elementor-widget-heading\" data-id=\"63cd6637\" data-element_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\"><a href=\"https:\/\/www.adesiviesigillanti.it\/en\/archive\/archive-2025\/issue-3-2025\/1-kaneka\/\">The use of Kaneka polymer technology in waterproofing applications<\/a><\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-1e3399df elementor-widget-divider--view-line elementor-widget elementor-widget-divider\" data-id=\"1e3399df\" data-element_type=\"widget\" data-widget_type=\"divider.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-divider\">\n\t\t\t<span class=\"elementor-divider-separator\">\n\t\t\t\t\t\t<\/span>\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-2ba07c7 elementor-widget elementor-widget-heading\" data-id=\"2ba07c7\" data-element_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\"><a href=\"https:\/\/www.adesiviesigillanti.it\/en\/archive\/archive-2025\/issue-3-2025\/2-elementis\/\">ELEMENTIS<\/a><\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-4c7dce98 elementor-widget elementor-widget-heading\" data-id=\"4c7dce98\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div 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data-element_type=\"widget\" data-widget_type=\"divider.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-divider\">\n\t\t\t<span class=\"elementor-divider-separator\">\n\t\t\t\t\t\t<\/span>\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-60c53dcf elementor-widget elementor-widget-heading\" data-id=\"60c53dcf\" data-element_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\"><a href=\"https:\/\/www.adesiviesigillanti.it\/en\/archive\/archive-2025\/issue-3-2025\/5-henkel-3-25\/\">HENKEL<\/a><\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-779992b8 elementor-widget elementor-widget-heading\" data-id=\"779992b8\" data-element_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\"><a href=\"https:\/\/www.adesiviesigillanti.it\/en\/archive\/archive-2025\/issue-3-2025\/5-henkel-3-25\/\">Henkel and Synthomer partner to cut carbon emissions in adhesives<\/a><\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-590782a elementor-widget-divider--view-line elementor-widget elementor-widget-divider\" data-id=\"590782a\" data-element_type=\"widget\" data-widget_type=\"divider.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-divider\">\n\t\t\t<span class=\"elementor-divider-separator\">\n\t\t\t\t\t\t<\/span>\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-288aae58 elementor-widget elementor-widget-heading\" data-id=\"288aae58\" data-element_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\"><a href=\"https:\/\/www.adesiviesigillanti.it\/en\/archive\/archive-2025\/issue-3-2025\/6-universidad\/\">UNIVERSIDAD DE BURGOS<\/a><\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-51ad11fd elementor-widget elementor-widget-heading\" data-id=\"51ad11fd\" data-element_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\"><a href=\"https:\/\/www.adesiviesigillanti.it\/en\/archive\/archive-2025\/issue-3-2025\/6-universidad\/\">Customized polyurethane adhesives for sustainable facade cladding and thermal insulation<\/a><\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-3e06317e elementor-widget-divider--view-line elementor-widget elementor-widget-divider\" data-id=\"3e06317e\" data-element_type=\"widget\" data-widget_type=\"divider.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-divider\">\n\t\t\t<span class=\"elementor-divider-separator\">\n\t\t\t\t\t\t<\/span>\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<div class=\"elementor-element elementor-element-26ff89f8 e-flex e-con-boxed e-con e-parent\" data-id=\"26ff89f8\" data-element_type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\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>Overcoming the bonding challenge of polypropylene in industrial manufacturing David ToblerSIKA As polypropylene becomes increasingly common in commercial vehicle construction\u2014especially in lightweight interior panels\u2014many smaller and mid-sized manufacturers face bonding challenges that large OEMs solve with automated surface treatments. This growing demand has led to the development of a new adhesive\u00a0system specifically tailored for manual [&hellip;]<\/p>\n","protected":false},"author":8,"featured_media":0,"parent":9583,"menu_order":3,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-9653","page","type-page","status-publish","hentry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>3-SIKA - Adesivi &amp; Sigillanti<\/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:\/\/www.adesiviesigillanti.it\/en\/archive\/archive-2025\/issue-3-2025\/3-sika\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"3-SIKA - Adesivi &amp; Sigillanti\" \/>\n<meta property=\"og:description\" content=\"Overcoming the bonding challenge of polypropylene in industrial manufacturing David ToblerSIKA As polypropylene becomes increasingly common in commercial vehicle construction\u2014especially in lightweight interior panels\u2014many smaller and mid-sized manufacturers face bonding challenges that large OEMs solve with automated surface treatments. 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