{"id":561,"date":"2025-07-03T02:03:31","date_gmt":"2025-07-03T02:03:31","guid":{"rendered":"https:\/\/www.coefficientfriction.com\/?p=561"},"modified":"2025-07-04T01:20:17","modified_gmt":"2025-07-04T01:20:17","slug":"astm-d4918-static-friction-test","status":"publish","type":"post","link":"https:\/\/www.coefficientfriction.com\/sk\/astm-d4918-static-friction-test","title":{"rendered":"Static Friction Test Guide Based on ASTM D4918"},"content":{"rendered":"<div data-elementor-type=\"wp-post\" data-elementor-id=\"561\" class=\"elementor elementor-561\" data-elementor-post-type=\"post\">\n\t\t\t\t<div class=\"elementor-element elementor-element-bd29f83 e-flex e-con-boxed e-con e-parent\" data-id=\"bd29f83\" data-element_type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-1b206fa elementor-widget elementor-widget-heading\" data-id=\"1b206fa\" 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\">Static Friction Test and ASTM D4918<\/h1>\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-4d9c25a e-flex e-con-boxed e-con e-parent\" data-id=\"4d9c25a\" data-element_type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-00bf54d elementor-widget__width-inherit elementor-widget elementor-widget-text-editor\" data-id=\"00bf54d\" 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 data-start=\"351\" data-end=\"855\">Understanding the <strong data-start=\"369\" data-end=\"393\">static friction test<\/strong> is crucial for professionals involved in quality control, packaging, paper testing, and related industries. According to <strong data-start=\"515\" data-end=\"529\">ASTM D4918<\/strong>, this method defines how to determine the static coefficient of friction of paper and paperboard materials using an inclined plane. This test is particularly relevant for packaging applications, where sliding resistance between paperboard or box surfaces can significantly affect stacking, transport, and handling efficiency.<\/p>\t\t\t\t\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-fb1009b e-flex e-con-boxed e-con e-parent\" data-id=\"fb1009b\" data-element_type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-53cd760 elementor-widget elementor-widget-heading\" data-id=\"53cd760\" 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\">Importance of Static Friction Testing in Packaging Applications<\/h2>\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-ce48346 e-flex e-con-boxed e-con e-parent\" data-id=\"ce48346\" data-element_type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-ff77a67 elementor-widget elementor-widget-text-editor\" data-id=\"ff77a67\" 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 data-start=\"930\" data-end=\"1306\">Friction behavior between paper surfaces affects material performance in automated packing, shipping stability, and stacking safety. The <strong data-start=\"1067\" data-end=\"1107\">statick\u00fd koeficient trenia (COF)<\/strong> refers to the force needed to initiate sliding between two surfaces, as opposed to kinetic COF, which pertains to continued motion. The <strong data-start=\"1244\" data-end=\"1268\">static friction test<\/strong> focuses on this <em data-start=\"1285\" data-end=\"1305\">initial resistance<\/em>.<\/p><p data-start=\"1308\" data-end=\"1639\"><strong data-start=\"1308\" data-end=\"1322\">ASTM D4918<\/strong> is designed primarily for <strong data-start=\"1349\" data-end=\"1389\">nenatieran\u00e9 papiere na p\u00edsanie a tla\u010d<\/strong>, but it can also be used for other grades like corrugated and solid fiberboards, given proper adjustments for their unique characteristics. It&#8217;s especially useful in determining the handling performance of packaging materials before product loading.<\/p>\t\t\t\t\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-f20f20f e-flex e-con-boxed e-con e-parent\" data-id=\"f20f20f\" data-element_type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-e776f66 elementor-widget elementor-widget-heading\" data-id=\"e776f66\" 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\">Carton COF Test and Coefficient of Friction of Box Materials<\/h2>\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-7345d2d e-flex e-con-boxed e-con e-parent\" data-id=\"7345d2d\" data-element_type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-b08d779 elementor-widget elementor-widget-text-editor\" data-id=\"b08d779\" 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 data-start=\"1711\" data-end=\"2069\">In the packaging sector, understanding the <strong data-start=\"1754\" data-end=\"1773\">carton COF test<\/strong> is vital. This test evaluates how much friction is present between box surfaces, which directly impacts stackability and pallet stability. A high <strong data-start=\"1920\" data-end=\"1954\">coefficient of friction of box<\/strong> material ensures boxes don\u2019t slip during shipping, while a low COF supports easy release during automated packing.<\/p><p data-start=\"2071\" data-end=\"2379\">Using <a href=\"https:\/\/store.astm.org\/d4918-97r07.html\" target=\"_blank\" rel=\"noopener\"><strong data-start=\"2077\" data-end=\"2091\">ASTM D4918<\/strong><\/a>, the inclined plane method simulates real-world conditions, allowing manufacturers to detect whether a paper-based or box material offers sufficient frictional resistance. The initial slip angle is recorded during the test to calculate the <strong data-start=\"2332\" data-end=\"2346\">statick\u00e9 COF<\/strong> using the tangent of that angle.<\/p><p data-start=\"2071\" data-end=\"2379\">For companies that produce or use paper cartons, a reliable COF value ensures operational safety and regulatory compliance.<\/p>\t\t\t\t\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-8aba3a6 e-flex e-con-boxed e-con e-parent\" data-id=\"8aba3a6\" data-element_type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-6179b7e elementor-widget elementor-widget-heading\" data-id=\"6179b7e\" 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\">How to Conduct a Static Friction Test Using ASTM D4918<\/h2>\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-a7c17bb e-flex e-con-boxed e-con e-parent\" data-id=\"a7c17bb\" data-element_type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-98f3925 elementor-widget__width-initial elementor-widget elementor-widget-text-editor\" data-id=\"98f3925\" 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>\u00a0<\/p><p>\u00a0<\/p><p>\u00a0<\/p><p>Here\u2019s a general overview of the <strong data-start=\"2605\" data-end=\"2629\">static friction test<\/strong> process following ASTM D4918 guidelines:<\/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-e3e3781 elementor-widget elementor-widget-video\" data-id=\"e3e3781\" data-element_type=\"widget\" data-settings=\"{&quot;youtube_url&quot;:&quot;https:\\\/\\\/www.youtube.com\\\/watch?v=WhCQu7dJkI8&quot;,&quot;video_type&quot;:&quot;youtube&quot;,&quot;controls&quot;:&quot;yes&quot;}\" data-widget_type=\"video.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-wrapper elementor-open-inline\">\n\t\t\t<div class=\"elementor-video\"><\/div>\t\t<\/div>\n\t\t\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-bbc87ee e-flex e-con-boxed e-con e-parent\" data-id=\"bbc87ee\" data-element_type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-03d6e88 elementor-widget elementor-widget-heading\" data-id=\"03d6e88\" 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\">1. Test Equipment<\/h3>\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-e2de683 e-flex e-con-boxed e-con e-parent\" data-id=\"e2de683\" data-element_type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-a492111 elementor-widget elementor-widget-text-editor\" data-id=\"a492111\" 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>Use a friction tester with an <strong data-start=\"2728\" data-end=\"2756\">inclined plane mechanism<\/strong>, such as the <strong data-start=\"2770\" data-end=\"2797\"><a href=\"https:\/\/www.coefficientfriction.com\/sk\/\">Cell Instruments<\/a> COF-03<\/strong>, which meets ASTM D4918 requirements. It\u2019s designed to provide accurate COF values for paper and packaging materials.<\/p>\t\t\t\t\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-f8c46b2 e-flex e-con-boxed e-con e-parent\" data-id=\"f8c46b2\" data-element_type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-817c116 elementor-widget elementor-widget-heading\" data-id=\"817c116\" 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\">2. Sample Preparation<\/h3>\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-ab92f9c e-flex e-con-boxed e-con e-parent\" data-id=\"ab92f9c\" data-element_type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-4e8c8a9 elementor-widget elementor-widget-text-editor\" data-id=\"4e8c8a9\" 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<ul><li data-start=\"2949\" data-end=\"2994\">Cut two test specimens from the sample sheet.<\/li><li data-start=\"2997\" data-end=\"3084\">Ensure both pieces are flat, free from creases, and within the standard size tolerance.<\/li><li data-start=\"3087\" data-end=\"3163\">Condition the samples in a standardized atmosphere (typically 23\u00b0C, 50% RH).<\/li><\/ul>\t\t\t\t\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-63cf402 e-flex e-con-boxed e-con e-parent\" data-id=\"63cf402\" data-element_type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-b8be051 elementor-widget elementor-widget-heading\" data-id=\"b8be051\" 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\">3. Test Procedure<\/h3>\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-117ac1f e-flex e-con-boxed e-con e-parent\" data-id=\"117ac1f\" data-element_type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-8a7456d elementor-widget elementor-widget-text-editor\" data-id=\"8a7456d\" 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<ul><li data-start=\"3193\" data-end=\"3276\">Place one specimen on the inclined plane (fixed) and another on top (movable sled).<\/li><li data-start=\"3279\" data-end=\"3340\">Slowly tilt the plane until the top specimen begins to slide.<\/li><li data-start=\"3343\" data-end=\"3387\">Record the angle at which movement starts.<\/li><li data-start=\"3390\" data-end=\"3448\">Str\u00e1nka <strong data-start=\"3394\" data-end=\"3428\">statick\u00fd koeficient trenia<\/strong> is calculated as:<\/li><li><span class=\"katex-display\"><span class=\"katex\"><span class=\"katex-mathml\">\u03bcs=tan\u2061(\u03b8)\\mu_s = \\tan(\\theta)<\/span><span class=\"katex-html\" aria-hidden=\"true\"><span class=\"base\"><span class=\"mord\"><span class=\"mord mathnormal\">\u03bc<\/span><span class=\"msupsub\"><span class=\"vlist-t vlist-t2\"><span class=\"vlist-r\"><span class=\"vlist\"><span class=\"sizing reset-size6 size3 mtight\"><span class=\"mord mathnormal mtight\">s<\/span><\/span><\/span><span class=\"vlist-s\">\u200b<\/span><\/span><\/span><\/span><\/span><span class=\"mrel\">=<\/span><\/span><span class=\"base\"><span class=\"mop\">tan<\/span><span class=\"mopen\">(<\/span><span class=\"mord mathnormal\">\u03b8<\/span><span class=\"mclose\">)<\/span><\/span><\/span><\/span><\/span><\/li><li data-start=\"3486\" data-end=\"3534\">kde <span class=\"katex\"><span class=\"katex-mathml\">\u03b8\\theta<\/span><span class=\"katex-html\" aria-hidden=\"true\"><span class=\"base\"><span class=\"mord mathnormal\">\u03b8<\/span><\/span><\/span><\/span> is the angle of initial slip.<\/li><\/ul>\t\t\t\t\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-62ec983 e-flex e-con-boxed e-con e-parent\" data-id=\"62ec983\" data-element_type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-9c5c413 elementor-widget elementor-widget-heading\" data-id=\"9c5c413\" 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\">4. Result Interpretation<\/h3>\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-2c7d41a e-flex e-con-boxed e-con e-parent\" data-id=\"2c7d41a\" data-element_type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-a138184 elementor-widget elementor-widget-text-editor\" data-id=\"a138184\" 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 data-start=\"3569\" data-end=\"3735\">Compare measured values against your product\u2019s performance requirements. High COF is desirable for stability in stacking, while low COF supports automation processes.<\/p>\t\t\t\t\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-94536be e-flex e-con-boxed e-con e-parent\" data-id=\"94536be\" data-element_type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-a095661 elementor-widget elementor-widget-heading\" data-id=\"a095661\" 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\">Why Choose the Cell Instruments COF-03 Tester?<\/h2>\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-5284a6c e-flex e-con-boxed e-con e-parent\" data-id=\"5284a6c\" data-element_type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-f569e84 elementor-widget__width-initial elementor-widget elementor-widget-text-editor\" data-id=\"f569e84\" 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 data-start=\"3793\" data-end=\"3973\">For laboratories and packaging companies looking to implement accurate COF analysis, we recommend the <strong data-start=\"3895\" data-end=\"3959\">Cell Instruments Coefficient of Friction Tester Model <a href=\"https:\/\/www.coefficientfriction.com\/sk\/inclined-plane-coefficient-of-friction-tester\/\">COF-03<\/a><\/strong>. This device:<\/p><ul><li data-start=\"3977\" data-end=\"4024\">Complies with <strong data-start=\"3991\" data-end=\"4005\">ASTM D4918<\/strong> and ISO standards.<\/li><li data-start=\"4027\" data-end=\"4081\">Supports both <strong data-start=\"4041\" data-end=\"4067\">statick\u00e1 a kinetick\u00e1 COF<\/strong> measurements.<\/li><li data-start=\"4084\" data-end=\"4156\">Offers high repeatability with advanced digital control and data output.<\/li><li data-start=\"4159\" data-end=\"4267\">Features a durable inclined plane mechanism ideal for testing various paper grades and corrugated materials.<\/li><\/ul><p data-start=\"4269\" data-end=\"4424\">By using the COF-03, users can gain reliable, standardized data essential for packaging design optimization and compliance with logistics safety standards.<\/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-ca5dd74 elementor-widget elementor-widget-image\" data-id=\"ca5dd74\" 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=\"750\" height=\"750\" src=\"https:\/\/www.coefficientfriction.com\/wp-content\/uploads\/2025\/07\/COF-03-Inclined-Plane-Coefficient-of-Friction-Tester-5_\u526f\u672c.webp\" class=\"attachment-large size-large wp-image-566\" alt=\"ASTM D4918-static friction test\" srcset=\"https:\/\/www.coefficientfriction.com\/wp-content\/uploads\/2025\/07\/COF-03-Inclined-Plane-Coefficient-of-Friction-Tester-5_\u526f\u672c.webp 750w, https:\/\/www.coefficientfriction.com\/wp-content\/uploads\/2025\/07\/COF-03-Inclined-Plane-Coefficient-of-Friction-Tester-5_\u526f\u672c-300x300.webp 300w, https:\/\/www.coefficientfriction.com\/wp-content\/uploads\/2025\/07\/COF-03-Inclined-Plane-Coefficient-of-Friction-Tester-5_\u526f\u672c-150x150.webp 150w, https:\/\/www.coefficientfriction.com\/wp-content\/uploads\/2025\/07\/COF-03-Inclined-Plane-Coefficient-of-Friction-Tester-5_\u526f\u672c-12x12.webp 12w\" sizes=\"(max-width: 750px) 100vw, 750px\" \/>\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\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-389c3b7 e-flex e-con-boxed e-con e-parent\" data-id=\"389c3b7\" data-element_type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-7c219f3 elementor-widget elementor-widget-heading\" data-id=\"7c219f3\" 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\">Applications Beyond Paper Testing<\/h2>\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-b419682 e-flex e-con-boxed e-con e-parent\" data-id=\"b419682\" data-element_type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-81535ce elementor-widget elementor-widget-text-editor\" data-id=\"81535ce\" 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 data-start=\"4469\" data-end=\"4565\">Str\u00e1nka <strong data-start=\"4473\" data-end=\"4497\">static friction test<\/strong> method extends beyond paper and carton testing. It\u2019s applicable to:<\/p><ul><li data-start=\"4568\" data-end=\"4599\"><strong data-start=\"4568\" data-end=\"4599\">Textile interlayer behavior<\/strong><\/li><li data-start=\"4602\" data-end=\"4635\"><strong data-start=\"4602\" data-end=\"4635\">Laminated packaging materials<\/strong><\/li><li data-start=\"4638\" data-end=\"4694\"><strong data-start=\"4638\" data-end=\"4694\">Paperboard slip characteristics in beverage carriers<\/strong><\/li><li data-start=\"4697\" data-end=\"4742\"><strong data-start=\"4697\" data-end=\"4742\">Pharmaceutical blister packaging friction<\/strong><\/li><\/ul><p data-start=\"4744\" data-end=\"4888\">These insights help manufacturers design safer, more efficient packaging systems that minimize product damage and improve machine compatibility.<\/p>\t\t\t\t\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-8ae1d49 e-flex e-con-boxed e-con e-parent\" data-id=\"8ae1d49\" data-element_type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-5aa1670 elementor-widget elementor-widget-heading\" data-id=\"5aa1670\" 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\">Final Thoughts<\/h2>\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-607e70d e-flex e-con-boxed e-con e-parent\" data-id=\"607e70d\" data-element_type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-1874455 elementor-widget elementor-widget-text-editor\" data-id=\"1874455\" 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 data-start=\"4914\" data-end=\"5277\">A properly executed <strong data-start=\"4934\" data-end=\"4958\">static friction test<\/strong> following ASTM D4918 enables packaging engineers, material developers, and quality control experts to ensure that paper and board-based packaging performs as expected under real-use conditions. Whether preventing box slippage in shipping or optimizing automatic packaging lines, COF testing delivers critical insights.<\/p><p data-start=\"5279\" data-end=\"5550\">Investing in reliable test equipment like <strong data-start=\"5321\" data-end=\"5349\">Cell Instruments\u2019 COF-03<\/strong> ensures consistent, accurate results across a range of materials. For packaging professionals aiming to meet quality standards and improve product performance, mastering this test method is essential.<\/p>\t\t\t\t\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-d822f74 e-flex e-con-boxed e-con e-parent\" data-id=\"d822f74\" data-element_type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-0d08481 elementor-widget elementor-widget-heading\" data-id=\"0d08481\" 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\">\u010casto kladen\u00e9 ot\u00e1zky<\/h3>\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-db120a1 e-flex e-con-boxed e-con e-parent\" data-id=\"db120a1\" data-element_type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-2e5d76a elementor-widget elementor-widget-text-editor\" data-id=\"2e5d76a\" 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 data-start=\"5567\" data-end=\"5814\"><strong data-start=\"5567\" data-end=\"5644\">Q1: What\u2019s the main difference between static and kinetic friction tests?<\/strong><br data-start=\"5644\" data-end=\"5647\" \/>A: Static friction measures the force to initiate movement, while kinetic friction measures the force to continue movement. ASTM D4918 focuses only on static friction.<\/p><p data-start=\"5816\" data-end=\"6012\"><strong data-start=\"5816\" data-end=\"5864\">Q2: Can ASTM D4918 be used for coated paper?<\/strong><br data-start=\"5864\" data-end=\"5867\" \/>A: While primarily developed for uncoated paper, it can be applied to other papers if tested with caution and understanding of reduced precision.<\/p><p data-start=\"6014\" data-end=\"6210\"><strong data-start=\"6014\" data-end=\"6079\">Q3: What is the acceptable range for static COF in packaging?<\/strong><br data-start=\"6079\" data-end=\"6082\" \/>A: The acceptable range varies by industry. For example, box materials may require a COF above 0.4 to ensure stacking stability.<\/p>\t\t\t\t\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>","protected":false},"excerpt":{"rendered":"<p>Static Friction Test and ASTM D4918 Understanding the static friction test is crucial for professionals involved in quality control, packaging, paper testing, and related industries. According to ASTM D4918, this method defines how to determine the static coefficient of friction of paper and paperboard materials using an inclined plane. This test is particularly relevant for [&hellip;]<\/p>","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-561","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.7 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Static friction test based on ASTM D4918 - Coefficient of Friction Tester<\/title>\n<meta name=\"description\" content=\"Learn how to static friction test according to ASTM D4918. Discover the benefits of Cell Instruments\u2019 COF-03 tester.\" \/>\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.coefficientfriction.com\/sk\/astm-d4918-static-friction-test\" \/>\n<meta property=\"og:locale\" content=\"sk_SK\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Static friction test based on ASTM D4918 - Coefficient of Friction Tester\" \/>\n<meta property=\"og:description\" content=\"Learn how to static friction test according to ASTM D4918. Discover the benefits of Cell Instruments\u2019 COF-03 tester.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.coefficientfriction.com\/sk\/astm-d4918-static-friction-test\" \/>\n<meta property=\"og:site_name\" content=\"Coefficient of Friction Tester\" \/>\n<meta property=\"article:published_time\" content=\"2025-07-03T02:03:31+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2025-07-04T01:20:17+00:00\" \/>\n<meta name=\"author\" content=\"admin\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Autor\" \/>\n\t<meta name=\"twitter:data1\" content=\"admin\" \/>\n\t<meta name=\"twitter:label2\" content=\"Predpokladan\u00fd \u010das \u010d\u00edtania\" \/>\n\t<meta name=\"twitter:data2\" content=\"4 min\u00faty\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/www.coefficientfriction.com\/astm-d4918-static-friction-test#article\",\"isPartOf\":{\"@id\":\"https:\/\/www.coefficientfriction.com\/astm-d4918-static-friction-test\"},\"author\":{\"name\":\"admin\",\"@id\":\"https:\/\/www.coefficientfriction.com\/#\/schema\/person\/fe1c1f30f9ae75dea13524ea144d6d7d\"},\"headline\":\"Static Friction Test Guide Based on ASTM D4918\",\"datePublished\":\"2025-07-03T02:03:31+00:00\",\"dateModified\":\"2025-07-04T01:20:17+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/www.coefficientfriction.com\/astm-d4918-static-friction-test\"},\"wordCount\":829,\"commentCount\":0,\"publisher\":{\"@id\":\"https:\/\/www.coefficientfriction.com\/#organization\"},\"articleSection\":[\"Uncategorized\"],\"inLanguage\":\"sk-SK\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\/\/www.coefficientfriction.com\/astm-d4918-static-friction-test#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.coefficientfriction.com\/astm-d4918-static-friction-test\",\"url\":\"https:\/\/www.coefficientfriction.com\/astm-d4918-static-friction-test\",\"name\":\"Static friction test based on ASTM D4918 - Coefficient of Friction Tester\",\"isPartOf\":{\"@id\":\"https:\/\/www.coefficientfriction.com\/#website\"},\"datePublished\":\"2025-07-03T02:03:31+00:00\",\"dateModified\":\"2025-07-04T01:20:17+00:00\",\"description\":\"Learn how to static friction test according to ASTM D4918. Discover the benefits of Cell Instruments\u2019 COF-03 tester.\",\"breadcrumb\":{\"@id\":\"https:\/\/www.coefficientfriction.com\/astm-d4918-static-friction-test#breadcrumb\"},\"inLanguage\":\"sk-SK\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/www.coefficientfriction.com\/astm-d4918-static-friction-test\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/www.coefficientfriction.com\/astm-d4918-static-friction-test#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\/\/www.coefficientfriction.com\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Static Friction Test Guide Based on ASTM D4918\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/www.coefficientfriction.com\/#website\",\"url\":\"https:\/\/www.coefficientfriction.com\/\",\"name\":\"Coefficient of Friction Tester\",\"description\":\"Material COF Test Solutoins\",\"publisher\":{\"@id\":\"https:\/\/www.coefficientfriction.com\/#organization\"},\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\/\/www.coefficientfriction.com\/?s={search_term_string}\"},\"query-input\":{\"@type\":\"PropertyValueSpecification\",\"valueRequired\":true,\"valueName\":\"search_term_string\"}}],\"inLanguage\":\"sk-SK\"},{\"@type\":\"Organization\",\"@id\":\"https:\/\/www.coefficientfriction.com\/#organization\",\"name\":\"Coefficient of Friction Tester\",\"url\":\"https:\/\/www.coefficientfriction.com\/\",\"logo\":{\"@type\":\"ImageObject\",\"inLanguage\":\"sk-SK\",\"@id\":\"https:\/\/www.coefficientfriction.com\/#\/schema\/logo\/image\/\",\"url\":\"https:\/\/www.coefficientfriction.com\/wp-content\/uploads\/2025\/03\/Coefficient-of-Friction-Tester-site.webp\",\"contentUrl\":\"https:\/\/www.coefficientfriction.com\/wp-content\/uploads\/2025\/03\/Coefficient-of-Friction-Tester-site.webp\",\"width\":836,\"height\":238,\"caption\":\"Coefficient of Friction Tester\"},\"image\":{\"@id\":\"https:\/\/www.coefficientfriction.com\/#\/schema\/logo\/image\/\"}},{\"@type\":\"Person\",\"@id\":\"https:\/\/www.coefficientfriction.com\/#\/schema\/person\/fe1c1f30f9ae75dea13524ea144d6d7d\",\"name\":\"admin\",\"image\":{\"@type\":\"ImageObject\",\"inLanguage\":\"sk-SK\",\"@id\":\"https:\/\/www.coefficientfriction.com\/#\/schema\/person\/image\/\",\"url\":\"https:\/\/secure.gravatar.com\/avatar\/d3f8e85c3fec7fb8735942e6bc233d5c91b156505ef9cb87f4fd670fe1bb9008?s=96&d=mm&r=g\",\"contentUrl\":\"https:\/\/secure.gravatar.com\/avatar\/d3f8e85c3fec7fb8735942e6bc233d5c91b156505ef9cb87f4fd670fe1bb9008?s=96&d=mm&r=g\",\"caption\":\"admin\"},\"sameAs\":[\"https:\/\/www.coefficientfriction.com\"],\"url\":\"https:\/\/www.coefficientfriction.com\/sk\/author\/admin\"}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"Static friction test based on ASTM D4918 - Coefficient of Friction Tester","description":"Learn how to static friction test according to ASTM D4918. Discover the benefits of Cell Instruments\u2019 COF-03 tester.","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/www.coefficientfriction.com\/sk\/astm-d4918-static-friction-test","og_locale":"sk_SK","og_type":"article","og_title":"Static friction test based on ASTM D4918 - Coefficient of Friction Tester","og_description":"Learn how to static friction test according to ASTM D4918. Discover the benefits of Cell Instruments\u2019 COF-03 tester.","og_url":"https:\/\/www.coefficientfriction.com\/sk\/astm-d4918-static-friction-test","og_site_name":"Coefficient of Friction Tester","article_published_time":"2025-07-03T02:03:31+00:00","article_modified_time":"2025-07-04T01:20:17+00:00","author":"admin","twitter_card":"summary_large_image","twitter_misc":{"Autor":"admin","Predpokladan\u00fd \u010das \u010d\u00edtania":"4 min\u00faty"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"Article","@id":"https:\/\/www.coefficientfriction.com\/astm-d4918-static-friction-test#article","isPartOf":{"@id":"https:\/\/www.coefficientfriction.com\/astm-d4918-static-friction-test"},"author":{"name":"admin","@id":"https:\/\/www.coefficientfriction.com\/#\/schema\/person\/fe1c1f30f9ae75dea13524ea144d6d7d"},"headline":"Static Friction Test Guide Based on ASTM D4918","datePublished":"2025-07-03T02:03:31+00:00","dateModified":"2025-07-04T01:20:17+00:00","mainEntityOfPage":{"@id":"https:\/\/www.coefficientfriction.com\/astm-d4918-static-friction-test"},"wordCount":829,"commentCount":0,"publisher":{"@id":"https:\/\/www.coefficientfriction.com\/#organization"},"articleSection":["Uncategorized"],"inLanguage":"sk-SK","potentialAction":[{"@type":"CommentAction","name":"Comment","target":["https:\/\/www.coefficientfriction.com\/astm-d4918-static-friction-test#respond"]}]},{"@type":"WebPage","@id":"https:\/\/www.coefficientfriction.com\/astm-d4918-static-friction-test","url":"https:\/\/www.coefficientfriction.com\/astm-d4918-static-friction-test","name":"Static friction test based on ASTM D4918 - Coefficient of Friction Tester","isPartOf":{"@id":"https:\/\/www.coefficientfriction.com\/#website"},"datePublished":"2025-07-03T02:03:31+00:00","dateModified":"2025-07-04T01:20:17+00:00","description":"Learn how to static friction test according to ASTM D4918. Discover the benefits of Cell Instruments\u2019 COF-03 tester.","breadcrumb":{"@id":"https:\/\/www.coefficientfriction.com\/astm-d4918-static-friction-test#breadcrumb"},"inLanguage":"sk-SK","potentialAction":[{"@type":"ReadAction","target":["https:\/\/www.coefficientfriction.com\/astm-d4918-static-friction-test"]}]},{"@type":"BreadcrumbList","@id":"https:\/\/www.coefficientfriction.com\/astm-d4918-static-friction-test#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https:\/\/www.coefficientfriction.com\/"},{"@type":"ListItem","position":2,"name":"Static Friction Test Guide Based on ASTM D4918"}]},{"@type":"WebSite","@id":"https:\/\/www.coefficientfriction.com\/#website","url":"https:\/\/www.coefficientfriction.com\/","name":"Tester koeficientu trenia","description":"Materi\u00e1l COF Testovacie rie\u0161enia","publisher":{"@id":"https:\/\/www.coefficientfriction.com\/#organization"},"potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/www.coefficientfriction.com\/?s={search_term_string}"},"query-input":{"@type":"PropertyValueSpecification","valueRequired":true,"valueName":"search_term_string"}}],"inLanguage":"sk-SK"},{"@type":"Organization","@id":"https:\/\/www.coefficientfriction.com\/#organization","name":"Tester koeficientu trenia","url":"https:\/\/www.coefficientfriction.com\/","logo":{"@type":"ImageObject","inLanguage":"sk-SK","@id":"https:\/\/www.coefficientfriction.com\/#\/schema\/logo\/image\/","url":"https:\/\/www.coefficientfriction.com\/wp-content\/uploads\/2025\/03\/Coefficient-of-Friction-Tester-site.webp","contentUrl":"https:\/\/www.coefficientfriction.com\/wp-content\/uploads\/2025\/03\/Coefficient-of-Friction-Tester-site.webp","width":836,"height":238,"caption":"Coefficient of Friction Tester"},"image":{"@id":"https:\/\/www.coefficientfriction.com\/#\/schema\/logo\/image\/"}},{"@type":"Person","@id":"https:\/\/www.coefficientfriction.com\/#\/schema\/person\/fe1c1f30f9ae75dea13524ea144d6d7d","name":"administr\u00e1tor","image":{"@type":"ImageObject","inLanguage":"sk-SK","@id":"https:\/\/www.coefficientfriction.com\/#\/schema\/person\/image\/","url":"https:\/\/secure.gravatar.com\/avatar\/d3f8e85c3fec7fb8735942e6bc233d5c91b156505ef9cb87f4fd670fe1bb9008?s=96&d=mm&r=g","contentUrl":"https:\/\/secure.gravatar.com\/avatar\/d3f8e85c3fec7fb8735942e6bc233d5c91b156505ef9cb87f4fd670fe1bb9008?s=96&d=mm&r=g","caption":"admin"},"sameAs":["https:\/\/www.coefficientfriction.com"],"url":"https:\/\/www.coefficientfriction.com\/sk\/author\/admin"}]}},"_links":{"self":[{"href":"https:\/\/www.coefficientfriction.com\/sk\/wp-json\/wp\/v2\/posts\/561","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.coefficientfriction.com\/sk\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.coefficientfriction.com\/sk\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.coefficientfriction.com\/sk\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.coefficientfriction.com\/sk\/wp-json\/wp\/v2\/comments?post=561"}],"version-history":[{"count":5,"href":"https:\/\/www.coefficientfriction.com\/sk\/wp-json\/wp\/v2\/posts\/561\/revisions"}],"predecessor-version":[{"id":591,"href":"https:\/\/www.coefficientfriction.com\/sk\/wp-json\/wp\/v2\/posts\/561\/revisions\/591"}],"wp:attachment":[{"href":"https:\/\/www.coefficientfriction.com\/sk\/wp-json\/wp\/v2\/media?parent=561"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.coefficientfriction.com\/sk\/wp-json\/wp\/v2\/categories?post=561"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.coefficientfriction.com\/sk\/wp-json\/wp\/v2\/tags?post=561"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}