{"id":15395,"date":"2018-01-25T08:31:41","date_gmt":"2018-01-25T07:31:41","guid":{"rendered":"https:\/\/www.rct-online.de\/magazin\/?p=15395"},"modified":"2025-12-10T15:32:10","modified_gmt":"2025-12-10T14:32:10","slug":"plastics-and-their-coefficient-of-friction","status":"publish","type":"post","link":"https:\/\/www.rct-online.de\/magazin\/en\/plastics-and-their-coefficient-of-friction\/","title":{"rendered":"Plastics and Their Coefficient of Friction"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_73 ez-toc-wrap-center counter-hierarchy ez-toc-counter ez-toc-white ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/www.rct-online.de\/magazin\/en\/plastics-and-their-coefficient-of-friction\/#Tribology_%E2%80%93_the_Science_of_Friction_and_Wear\" title=\"Tribology \u2013 the Science of Friction and Wear\">Tribology \u2013 the Science of Friction and Wear<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.rct-online.de\/magazin\/en\/plastics-and-their-coefficient-of-friction\/#Polymer_Materials_in_Tribological_Applications\" title=\"Polymer Materials in Tribological Applications\">Polymer Materials in Tribological Applications<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.rct-online.de\/magazin\/en\/plastics-and-their-coefficient-of-friction\/#The_Right_Material_Combination_%E2%80%93_PlasticMetal_or_PlasticPlastic\" title=\"The Right Material Combination \u2013 Plastic\/Metal or Plastic\/Plastic?\">The Right Material Combination \u2013 Plastic\/Metal or Plastic\/Plastic?<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.rct-online.de\/magazin\/en\/plastics-and-their-coefficient-of-friction\/#PlasticMetal\" title=\"Plastic\/Metal\">Plastic\/Metal<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/www.rct-online.de\/magazin\/en\/plastics-and-their-coefficient-of-friction\/#PlasticPlastic\" title=\"Plastic\/Plastic\">Plastic\/Plastic<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/www.rct-online.de\/magazin\/en\/plastics-and-their-coefficient-of-friction\/#Low-Friction_Sealing_Technology\" title=\"Low-Friction Sealing Technology\">Low-Friction Sealing Technology<\/a><\/li><\/ul><\/nav><\/div>\n<p style=\"text-align: justify;\"><strong>In plant and mechanical engineering, in drive technology, or in precision mechanics, information on the friction behavior of the materials used is essential, with the coefficient of friction being a key criterion. In motors, gear units, compressors, and hydraulic systems, various machine and <\/strong><a href=\"https:\/\/www.rct-online.de\/en\/drive-elements\"><strong>drive elements<\/strong><\/a><strong> such as plain and rolling bearings or gear drives operate with different materials moving against each other. Other areas, such as sealing technology\u2014relevant, for example, for pumps\u2014likewise demand truly frictionless operation. Undesired friction inevitably leads to wear of components, which can ultimately result in loss of functionality of the machinery involved.<\/strong><\/p>\n<figure id=\"attachment_1133\" aria-describedby=\"caption-attachment-1133\" style=\"width: 600px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-1133 size-full\" title=\"Plastic gears\" src=\"https:\/\/www.rct-online.de\/magazin\/wp-content\/uploads\/2018\/01\/Plastik-Zahnraeder.jpg\" alt=\"Plastic gears\" width=\"600\" height=\"400\" srcset=\"https:\/\/www.rct-online.de\/magazin\/wp-content\/uploads\/2018\/01\/Plastik-Zahnraeder.jpg 600w, https:\/\/www.rct-online.de\/magazin\/wp-content\/uploads\/2018\/01\/Plastik-Zahnraeder-300x200.jpg 300w\" sizes=\"(max-width: 600px) 100vw, 600px\" \/><figcaption id=\"caption-attachment-1133\" class=\"wp-caption-text\">\u00a9 Mr Twister \/ Fotolia.com<\/figcaption><\/figure>\n<p style=\"text-align: justify;\"><strong>It is therefore not surprising that this leads to economic losses worth billions every year. Some estimates suggest a macroeconomic impact of five to eight percent of the gross domestic product. This makes it worthwhile to take a closer look at how such losses can be reduced and what role modern polymer materials play today.<\/strong><\/p>\n<h2><span class=\"ez-toc-section\" id=\"Tribology_%E2%80%93_the_Science_of_Friction_and_Wear\"><\/span>Tribology \u2013 the Science of Friction and Wear<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p style=\"text-align: justify;\">According to today\u2019s accepted scientific definition, tribology is \u201can interdisciplinary field aimed at optimizing mechanical technologies by reducing friction- and wear-related energy and material losses.\u201d The withdrawn German standard DIN 50320:1979-12 defined it in greater detail as the \u201cscience and technology of interacting surfaces in relative motion,\u201d covering the entire field of friction and wear, including lubrication, and the effects at the interfaces between solids as well as between solids and liquids or gases.<\/p>\n<figure id=\"attachment_1122\" aria-describedby=\"caption-attachment-1122\" style=\"width: 600px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-1122 size-full\" title=\"Inclined plane with friction\" src=\"https:\/\/www.rct-online.de\/magazin\/wp-content\/uploads\/2018\/01\/Schiefe-Ebene-mit-Reibung-e1516871606774.jpg\" alt=\"Inclined plane with friction\" width=\"600\" height=\"370\" srcset=\"https:\/\/www.rct-online.de\/magazin\/wp-content\/uploads\/2018\/01\/Schiefe-Ebene-mit-Reibung-e1516871606774.jpg 600w, https:\/\/www.rct-online.de\/magazin\/wp-content\/uploads\/2018\/01\/Schiefe-Ebene-mit-Reibung-e1516871606774-300x185.jpg 300w\" sizes=\"(max-width: 600px) 100vw, 600px\" \/><figcaption id=\"caption-attachment-1122\" class=\"wp-caption-text\">\u00a9 thingamajiggs \/ Fotolia.com<\/figcaption><\/figure>\n<p style=\"text-align: justify;\">When two bodies are set into motion relative to each other, different forces act on them. Perpendicular to the contact surface acts the normal force, also known as the contact pressure. The force opposing the direction of motion is the frictional force. A distinction is made between static friction, which acts on stationary bodies, and sliding friction, which occurs at the contact surfaces of bodies moving relative to each other. Frictional force arises due to surface irregularities and the cohesive forces between molecules on the interacting surfaces.<\/p>\n<blockquote>\n<p style=\"text-align: justify;\">Friction is therefore not a material property; it is determined by the material pairing, the surface characteristics of the sliding partners, and the normal force acting on them.<\/p>\n<\/blockquote>\n<p style=\"text-align: justify;\">The coefficient of friction\u2014also known as the friction coefficient\u2014defines the ratio of frictional force to normal force. It can be experimentally determined for different material pairings using tribometers. The coefficient of friction, including the friction coefficient of plastics, depends not only on the material pairing and surface roughness but also on the temperature of the sliding surfaces, the sliding speed, and the normal load.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Polymer_Materials_in_Tribological_Applications\"><\/span>Polymer Materials in Tribological Applications<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p style=\"text-align: justify;\">The use of plastics in components subject to friction and wear has grown significantly in recent years, as they offer advantages over purely metallic components in specific cases. In transport systems\u2014such as gears and <a href=\"https:\/\/www.rct-online.de\/en\/drive-elements\/roller-chains-and-sprockets\">sprockets<\/a>\u2014and in plain or ball bearings, plastic bushings often outperform metallic counterparts because they require no lubrication. The same applies to applications where boundary or mixed friction occurs and a fully formed lubrication film cannot be guaranteed.<\/p>\n<p><a href=\"https:\/\/www.rct-online.de\/en\/drive-elements\/bushes\/30991\/plain-bearing-bush-made-of-polyamide-with-flange\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-1101 size-full\" title=\"Plain Bearing Bush made of Polyamide - with flange\" src=\"https:\/\/www.rct-online.de\/magazin\/wp-content\/uploads\/2018\/01\/Gleitlagerbuchse-aus-Polyamid-mit-Bund-einbaufertig.jpg\" alt=\"Plain Bearing Bush made of Polyamide - with flange\" width=\"600\" height=\"300\" srcset=\"https:\/\/www.rct-online.de\/magazin\/wp-content\/uploads\/2018\/01\/Gleitlagerbuchse-aus-Polyamid-mit-Bund-einbaufertig.jpg 600w, https:\/\/www.rct-online.de\/magazin\/wp-content\/uploads\/2018\/01\/Gleitlagerbuchse-aus-Polyamid-mit-Bund-einbaufertig-300x150.jpg 300w\" sizes=\"(max-width: 600px) 100vw, 600px\" \/><\/a><\/p>\n<p style=\"text-align: justify;\">This effect is observed, for example, in bearings with fluctuating rotational speeds. Depending on the application, additional material properties may be required\u2014such as chemical and mechanical resistance, abrasion resistance, electrical insulation, or damping behavior. Plastics also offer economic advantages, as many components can be produced more cost-effectively than metal parts.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"The_Right_Material_Combination_%E2%80%93_PlasticMetal_or_PlasticPlastic\"><\/span>The Right Material Combination \u2013 Plastic\/Metal or Plastic\/Plastic?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p style=\"text-align: justify;\">In practice, numerous drive or <a href=\"https:\/\/www.rct-online.de\/en\/seals-and-gaskets\">sealing elements<\/a> are made from combinations such as metal\/metal, plastic\/metal, or plastic\/plastic. The focus here is on the latter two. Which combination is best for a given application? The coefficient of friction of plastics is an essential parameter, and additional reference values include the maximum allowable surface temperature and, for dynamically loaded bearings, the pv value (the product of surface pressure and average sliding speed). These values are not inherent material properties and must be determined for each pairing. For many combinations, experimentally determined data is already available in reference tables.<\/p>\n<p><center><a href=\"https:\/\/www.rct-online.de\/en\/drive-elements\/bevel-gears\/30952\/bevel-gear-made-of-plastic-die-cast\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-1095 size-full\" title=\"Bevel Gear made of Plastic - die-cast\" src=\"https:\/\/www.rct-online.de\/magazin\/wp-content\/uploads\/2018\/01\/Kegelrad-aus-Kunststoff-gespritzt-1.jpg\" alt=\"Bevel Gear made of Plastic - die-cast\" width=\"300\" height=\"300\" srcset=\"https:\/\/www.rct-online.de\/magazin\/wp-content\/uploads\/2018\/01\/Kegelrad-aus-Kunststoff-gespritzt-1.jpg 300w, https:\/\/www.rct-online.de\/magazin\/wp-content\/uploads\/2018\/01\/Kegelrad-aus-Kunststoff-gespritzt-1-150x150.jpg 150w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/a> <a href=\"https:\/\/www.rct-online.de\/en\/drive-elements\/gears-and-gear-racks\/30940\/spur-gear-made-of-plastic-milled-module-0.5-2.0\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-1096 size-full\" title=\"Spur Gear made of plastic (milled) | Module 0.5-2.0\" src=\"https:\/\/www.rct-online.de\/magazin\/wp-content\/uploads\/2018\/01\/Stirnzahnrad-aus-Kunststoff-gefraest-Modul-05-20-1.jpg\" alt=\"Spur Gear made of plastic (milled) | Module 0.5-2.0\" width=\"300\" height=\"300\" srcset=\"https:\/\/www.rct-online.de\/magazin\/wp-content\/uploads\/2018\/01\/Stirnzahnrad-aus-Kunststoff-gefraest-Modul-05-20-1.jpg 300w, https:\/\/www.rct-online.de\/magazin\/wp-content\/uploads\/2018\/01\/Stirnzahnrad-aus-Kunststoff-gefraest-Modul-05-20-1-150x150.jpg 150w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/a><\/center><\/p>\n<p style=\"text-align: justify;\">This allows an initial assessment of suitable materials\u2014such as PTFE, POM, or PET\u2014once operating conditions like sliding speed, temperature, and load are known.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"PlasticMetal\"><\/span>Plastic\/Metal<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p style=\"text-align: justify;\">Plastic\/metal pairings are widely used because heat can be dissipated efficiently through the metallic partner while the plastic component can be tailored to the application. Plastics such as PTFE or POM are suitable for high sliding speeds, as sliding surface temperature is a key wear factor and these materials tolerate the heat generated during operation. On the metal side, hardness and surface quality must match the plastic. Generally, high hardness (HRc &gt; 50) is advantageous to avoid early wear. With softer metals, surface asperities may break off and embed into the plastic, acting like abrasives.<\/p>\n<p><a href=\"https:\/\/www.rct-online.de\/en\/drive-elements\/roller-chains-and-sprockets\/30906\/single-strand-roller-chains-made-of-plastic-with-stainless-steel-outer-links\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-1115 size-full\" title=\"Single-Strand Roller Chains made of plastic - with stainless steel outer links\" src=\"https:\/\/www.rct-online.de\/magazin\/wp-content\/uploads\/2018\/01\/Einfach-Rollenkette-aus-Kunststoff-mit-Edelstahl-Aussengliedern-1.jpg\" alt=\"Single-Strand Roller Chains made of plastic - with stainless steel outer links\" width=\"600\" height=\"400\" srcset=\"https:\/\/www.rct-online.de\/magazin\/wp-content\/uploads\/2018\/01\/Einfach-Rollenkette-aus-Kunststoff-mit-Edelstahl-Aussengliedern-1.jpg 600w, https:\/\/www.rct-online.de\/magazin\/wp-content\/uploads\/2018\/01\/Einfach-Rollenkette-aus-Kunststoff-mit-Edelstahl-Aussengliedern-1-300x200.jpg 300w\" sizes=\"(max-width: 600px) 100vw, 600px\" \/><\/a><\/p>\n<p style=\"text-align: justify;\">The influence of metal surface roughness on the coefficient of friction depends on the polymer material: smooth surfaces are ideal for non-polar plastics such as PTFE or PET. For polar materials like polyoxymethylene (POM), very smooth metal surfaces promote adhesion and the formation of bonding bridges, increasing friction and potentially causing wear. A friction coefficient that may be ideal under other conditions becomes less favorable. Reference values for the surface roughness of metal sliding partners in combination with different plastics should therefore be considered. The load applied also affects wear, meaning the pv value must be taken into account as well.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"PlasticPlastic\"><\/span>Plastic\/Plastic<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p style=\"text-align: justify;\">In plastic\/plastic systems, adhesion forces between the surfaces are the dominant factor. Sliding surface temperature and the associated frictional heat tend to be higher than in other pairings. Although their load capacity is lower, these systems offer advantages when chemical inertness, electrical insulation, or good damping characteristics are required.<\/p>\n<p><a href=\"https:\/\/www.rct-online.de\/en\/drive-elements\/gears-and-gear-racks\/30946\/gear-rack-made-of-plastic-milled\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-1113 size-full\" title=\"Gear Rack made of plastic - milled\" src=\"https:\/\/www.rct-online.de\/magazin\/wp-content\/uploads\/2018\/01\/Zahnstange-aus-Kunststoff-gefraest-1.jpg\" alt=\"Gear Rack made of plastic - milled\" width=\"600\" height=\"300\" srcset=\"https:\/\/www.rct-online.de\/magazin\/wp-content\/uploads\/2018\/01\/Zahnstange-aus-Kunststoff-gefraest-1.jpg 600w, https:\/\/www.rct-online.de\/magazin\/wp-content\/uploads\/2018\/01\/Zahnstange-aus-Kunststoff-gefraest-1-300x150.jpg 300w\" sizes=\"(max-width: 600px) 100vw, 600px\" \/><\/a><\/p>\n<p style=\"text-align: justify;\">Lubricants remain an important measure for optimizing friction coefficients and friction behavior in all material pairings. A lubrication film reduces friction; however, surface changes may occur due to chemical or physical reactions with the lubricant and its additives. Self-lubricating plastics, which require no lubrication, offer economic and environmental benefits.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Low-Friction_Sealing_Technology\"><\/span>Low-Friction Sealing Technology<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p style=\"text-align: justify;\">Another area in which both the coefficient of friction and the friction behavior of materials play a central role is sealing technology. Different sealing materials\u2014such as FFKM, PVC, or silicone rubber\u2014must meet specific requirements depending on the application.<\/p>\n<p><center><a href=\"https:\/\/www.rct-online.de\/en\/seals-and-gaskets\/o-rings\/ffkm-o-rings\/30634\/high-performance-ffkm-o-rings\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-1107 size-full\" title=\"High-Performance FFKM O-Rings\" src=\"https:\/\/www.rct-online.de\/magazin\/wp-content\/uploads\/2018\/01\/FFKM-O-Ringe.jpg\" alt=\"High-Performance FFKM O-Rings\" width=\"300\" height=\"300\" srcset=\"https:\/\/www.rct-online.de\/magazin\/wp-content\/uploads\/2018\/01\/FFKM-O-Ringe.jpg 300w, https:\/\/www.rct-online.de\/magazin\/wp-content\/uploads\/2018\/01\/FFKM-O-Ringe-150x150.jpg 150w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/a> <a href=\"https:\/\/www.rct-online.de\/en\/seals-and-gaskets\/flat-gaskets\/30652\/high-performance-fpm-flat-seals\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-1108 size-full\" title=\"High-Performance FPM Flat Seals\" src=\"https:\/\/www.rct-online.de\/magazin\/wp-content\/uploads\/2018\/01\/FPM-Flachdichtungen.jpg\" alt=\"High-Performance FPM Flat Seals\" width=\"300\" height=\"300\" srcset=\"https:\/\/www.rct-online.de\/magazin\/wp-content\/uploads\/2018\/01\/FPM-Flachdichtungen.jpg 300w, https:\/\/www.rct-online.de\/magazin\/wp-content\/uploads\/2018\/01\/FPM-Flachdichtungen-150x150.jpg 150w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/a><\/center><\/p>\n<p style=\"text-align: justify;\">In static seals, such as <a href=\"https:\/\/www.rct-online.de\/en\/seals-and-gaskets\/flat-gaskets\">flat gaskets<\/a> made from PVC or <a href=\"https:\/\/www.rct-online.de\/en\/seals-and-gaskets\/o-rings\">O-rings<\/a> made from FFKM, friction is less critical; contact pressure and material resistance are more important. In dynamic sealing, however\u2014when flat gaskets or O-rings are used for axial, rotating, or oscillating movements\u2014the frictional behavior of the plastic again becomes crucial.<\/p>\n<p style=\"text-align: justify;\"><a href=\"https:\/\/www.rct-online.de\/en\/seals-and-gaskets\/o-rings\/silicone-o-rings\/30644\/silicone-o-rings-metric\"><img loading=\"lazy\" decoding=\"async\" class=\"alignright wp-image-1103 size-full\" title=\"Silicone O-Rings - metric\" src=\"https:\/\/www.rct-online.de\/magazin\/wp-content\/uploads\/2018\/01\/Silikon-O-Ringe-metrisch.jpg\" alt=\"Silicone O-Rings - metric\" width=\"300\" height=\"300\" srcset=\"https:\/\/www.rct-online.de\/magazin\/wp-content\/uploads\/2018\/01\/Silikon-O-Ringe-metrisch.jpg 300w, https:\/\/www.rct-online.de\/magazin\/wp-content\/uploads\/2018\/01\/Silikon-O-Ringe-metrisch-150x150.jpg 150w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/a>A low coefficient of static friction is also desirable to prevent the so-called stick-slip effect\u2014jerky sliding that can occur during frequent restarts. Material resistance to the lubricants used must also be considered. Suitable choices include <a href=\"https:\/\/www.rct-online.de\/en\/seals-and-gaskets\/o-rings\/ptfe-o-rings\">PTFE O-rings<\/a> or FFKM O-rings due to their broad chemical resistance, as well as <a href=\"https:\/\/www.rct-online.de\/en\/seals-and-gaskets\/o-rings\/silicone-o-rings\">silicone rubber O-rings<\/a> when physiological safety is required, for example in pharmaceutical or food-processing environments.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>In plant and mechanical engineering, in drive technology, or in precision mechanics, information on the friction behavior of the materials used is essential, with the coefficient of friction being a key criterion. In motors, gear units, compressors, and hydraulic systems, various machine and drive elements such as plain and rolling bearings or gear drives operate &hellip;<\/p>\n","protected":false},"author":7,"featured_media":15398,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1,2748],"tags":[3040],"class_list":["post-15395","post","type-post","status-publish","format-standard","has-post-thumbnail","","category-all-articles","category-materials-in-chemistry","tag-o-ringe-en"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v23.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Plastics and Their Coefficient of Friction - Reichelt Chemietechnik Magazine<\/title>\n<meta name=\"description\" content=\"The Reichelt Chemietechnik Magazine provides useful insights into the coefficient of friction of plastics \u2714 and material pairings \u2714\" \/>\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.rct-online.de\/magazin\/en\/plastics-and-their-coefficient-of-friction\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Plastics and Their Coefficient of Friction - 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