{"id":23104,"date":"2023-11-28T05:29:33","date_gmt":"2023-11-28T11:29:33","guid":{"rendered":"https:\/\/www.polywater.com\/?p=23104"},"modified":"2025-04-17T11:59:47","modified_gmt":"2025-04-17T16:59:47","slug":"coefficient-of-friction-cof-explained","status":"publish","type":"post","link":"https:\/\/www.polywater.com\/en\/knowledge-hub\/coefficient-of-friction-cof-explained\/","title":{"rendered":"Coefficient of Friction (COF) Explained"},"content":{"rendered":"<div id=\"vyLightbox\"><\/div>\n<h2>What is Coefficient of Friction or COF?<\/h2>\n<p>Coefficient of Friction (COF) is surface resistance to movement. It is a measure of how sticky or slippery two surfaces are when rubbed together. COF is used to predict force or tension on cable.<\/p>\n<p>When pulling wire or cable through a conduit, COF directly influences the pulling force applied to the cable to overcome the frictional resistance between the cable and conduit surfaces.<\/p>\n<p>COF formula: \u03bc = F\/N<\/p>\n<p>Where:<\/p>\n<p>\u00b5 = Coefficient of Friction<br \/>\nF = Pulling (horizontal) force<br \/>\nN = Normal or sidewall force<\/p>\n<p><!-- Put this wherever you would like your player to appear --><img decoding=\"async\" class=\"vidyard-player-embed alignnone\" style=\"width: 100%; margin: auto; display: block; max-width: 900px;\" src=\"https:\/\/play.vidyard.com\/FobvSFJHjp5oPSENDr8q83.jpg\" data-uuid=\"FobvSFJHjp5oPSENDr8q83\" data-v=\"4\" data-type=\"lightbox\" data-width=\"900\" \/><\/p>\n<h2>What is Static COF (\u00b5<sub>s<\/sub>)?<\/h2>\n<p>Static Coefficient of Friction represents the force required to initiate relative motion between two surfaces that are in contact with each other, but not moving. It describes the force required to put a body in motion.<br \/>\nStatic COF can be measured using an inclined plane method. \u00b5S is derived using the angle at which the object starts to move as well as the gravitational weight of the object.<\/p>\n<h2>What is Kinetic COF(\u00b5<sub>k<\/sub>)?<\/h2>\n<p>Kinetic Coefficient of Friction or Kinetic COF represents the resistance to movement once the object or surfaces are in motion.<br \/>\nKinetic COF is lower than static COF. It is better to keep an object in motion to conserve the additional force required to start moving it. In best practice cable installation, do not stop the pull. Keep the cable moving until it reaches the end of the duct.<\/p>\n<h2>How do you calculate Coefficient of Friction, or COF, for cable pulling?<\/h2>\n<p>There are several ways to measure the cable forces to calculate Coefficient of Friction, or COF, based on the pull\u2019s geometry. Polywater uses a variety of test methods to study COF between cable and conduit. We have created a very specific testing device, <a href=\"https:\/\/www.polywater.com\/en\/knowledge-hub\/measuring-friction-on-polywaters-friction-table\/\" target=\"_blank\" rel=\"noopener\">The Polywater Friction Table<\/a>, to measure the friction between different lubricant, cable, and conduit material combinations. The data collected includes multiple manufacturers\/suppliers for each material type. These data have been compiled over years of testing.<br \/>\nEngineers can access this database using the <a href=\"https:\/\/videos.polywater.com\/watch\/hxvBSq3N2RcC4V58F4MpMu?\" target=\"_blank\" rel=\"noopener\">Polywater\u00ae Pull-Planner\u2122 software<\/a>. This tool offers the capability to predict cable tension based on different cable, conduit, and lubricant combinations. The software guides the planning process for the cable installation.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-23110\" src=\"https:\/\/www.polywater.com\/wp-content\/uploads\/2023\/10\/Friction-Table-Test-1.png\" alt=\"A young scientist wearing glasses and a blue lab coat looks Polywater's friction testing table. A curved piece of conduit has a short cut section of High-Voltage electrical cable. A mechanism is applying pressure to the cable as it is slid through the conduit.\" width=\"900\" height=\"400\" srcset=\"https:\/\/www.polywater.com\/wp-content\/uploads\/2023\/10\/Friction-Table-Test-1.png 900w, https:\/\/www.polywater.com\/wp-content\/uploads\/2023\/10\/Friction-Table-Test-1-300x133.png 300w, https:\/\/www.polywater.com\/wp-content\/uploads\/2023\/10\/Friction-Table-Test-1-768x341.png 768w\" sizes=\"auto, (max-width: 900px) 100vw, 900px\" \/><\/p>\n<table style=\"width: 100%; border: 3px solid #273A80; background-color: #69c3e8; margin: 15px 0px 15px 0px;\">\n<tbody>\n<tr>\n<td style=\"padding: 20px; text-align: center;\"><a href=\"https:\/\/www.polywater.com\/en\/solution-story\/data-from-polywater-helps-predict-coefficient-of-friction-in-a-cable-pull\/\" target=\"_blank\" rel=\"noopener\">Learn more about how <strong>data from Polywater helps predict COF in a cable pull<\/strong><\/a><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2>What factors determine Coefficient of Friction, or COF, in a cable installation?<\/h2>\n<p>While materials like the cable jacket, conduit material, and lubricant type drive the laboratory Coefficient of Friction (COF) measurement, field conditions further influence this performance during cable installation. The factors that determine Coefficient of Friction, or COF, values are:<\/p>\n<ul>\n<li>Movement \u2013 The energy to initiate motion (static COF) is higher than that required to keep the object moving (kinetic COF).<\/li>\n<li>Normal Force &#8212; Higher pressure will change the surface properties as well. In cable pulling science this is seen as lower COF in bends, under high sidewall force.<\/li>\n<li>Material Condition \u2013 This can include surface oxidation, smoothness of surface finish, cleanliness, etc.<\/li>\n<li>Temperature \u2013 Extreme temperatures will increase COF.<\/li>\n<li>Lubricant Application \u2013 Lubricants respond to surfaces differently. The lubricant must fully coat the two surfaces for optimum performance. Some surfaces are more difficult to lubricate than others.<\/li>\n<\/ul>\n<p>In the context of cable or wire pulling, the calculation of a meaningful or effective COF considers these factors, as well as knowledge of the materials involved. In other words, the effective COF builds a safety factor into the tension prediction.<\/p>\n<table style=\"width: 100%; border: 3px solid #273A80; background-color: #69c3e8; margin: 15px 0px 15px 0px;\">\n<tbody>\n<tr>\n<td style=\"padding: 20px; text-align: center;\"><a href=\"https:\/\/www.polywater.com\/en\/knowledge-hub\/frequently-asked-questions-cable-pulling-lubrication-and-tension\/\" target=\"_blank\" rel=\"noopener\">For more information on measuring COF in cable pulling, visit our page on the most <strong>frequently asked questions regarding cable pulling, lubrication, and tension<\/strong><\/a><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2>Why is Coefficient of Friction, or COF, important in cable pulling, cable hauling, or wire pulling?<\/h2>\n<p>During an installation, cable or wire is subjected to both pulling tension and sidewall force. These forces should not exceed the limits set by the manufacturer. If these limits are exceeded, the damage to the cable may not be immediately visible. The longevity of the cable can be impacted, lowering its design life by years.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-23122\" src=\"https:\/\/www.polywater.com\/wp-content\/uploads\/2023\/10\/Underground-Cable-Install_2.png\" alt=\"A view of multiple high-voltage cables running through an underground, grey concrete vault. A red bucket with worker's tools can be seen in the corner.\" width=\"900\" height=\"400\" srcset=\"https:\/\/www.polywater.com\/wp-content\/uploads\/2023\/10\/Underground-Cable-Install_2.png 900w, https:\/\/www.polywater.com\/wp-content\/uploads\/2023\/10\/Underground-Cable-Install_2-300x133.png 300w, https:\/\/www.polywater.com\/wp-content\/uploads\/2023\/10\/Underground-Cable-Install_2-768x341.png 768w\" sizes=\"auto, (max-width: 900px) 100vw, 900px\" \/><\/p>\n<p>Reducing Coefficient of Friction (COF) is important in cable pulling, cable hauling, or wire pulling because it lowers tension. This is important for several reasons as it allows you to prevent damage to the cable and other assets, keep the installation safe for workers and equipment, make the installation as efficient as possible, and potentially install greater lengths of cable to minimize the number of splices, junction boxes, and vaults.<\/p>\n<table style=\"width: 100%; border: 3px solid #273A80; background-color: #69c3e8; margin: 15px 0px 15px 0px;\">\n<tbody>\n<tr>\n<td style=\"padding: 20px; text-align: center;\"><a href=\"https:\/\/www.polywater.com\/en\/knowledge-hub\/coefficient-of-friction-in-cable-pulling-part-1\/\" target=\"_blank\" rel=\"noopener\">For more information on understanding COF in cable pulling, read our article on <strong>Coefficient of Friction in Cable Pulling<\/strong><\/a><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2>How do you reduce Coefficient of Friction, or COF, in cable pulling, cable hauling, or wire pulling?<\/h2>\n<p><a href=\"https:\/\/www.polywater.com\/en\/products\/lubricants\/?industry=lubricants\" target=\"_blank\" rel=\"noopener\">Engineered cable lubricants<\/a> play a critical role in reducing Coefficient of Friction (COF) in cable or wire pulling operations. The cable and conduit materials, the condition of the conduit&#8217;s interior surface, and the system design all have an impact on COF. Proper planning and installation practices can help ensure the success and safety of cable pulling operations.<\/p>\n<table style=\"width: 100%; border: 3px solid #273A80; background-color: #69c3e8; margin: 15px 0px 15px 0px;\">\n<tbody>\n<tr>\n<td style=\"padding: 20px; text-align: center;\"><a href=\"https:\/\/videos.polywater.com\/watch\/hxvBSq3N2RcC4V58F4MpMu?\" target=\"_blank\" rel=\"noopener\">If you would like to know more about proper planning practices to reduce COF in cable installation, learn about the <strong>Polywater\u00ae Pull-Planner\u2122 software<\/strong><\/a><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2>Have any questions?<\/h2>\n<p><button class=\"button button--primary\" data-micromodal-trigger=\"polywater-modal--email-us-form\">Email Us <\/button><\/p>\n<div class=\"modal micromodal-slide\" id=\"polywater-modal--email-us-form\" aria-hidden=\"true\"><div class=\"modal__overlay\" tabindex=\"-1\" data-micromodal-close><div class=\"modal__container\" role=\"dialog\" aria-modal=\"true\" aria-labelledby=\"polywater-modal--email-us-form-title\"><header class=\"modal__header\"><h2 id=\"polywater-modal--email-us-form-title\">Email Us Form<\/h2><button class=\"button--secondary modal__close\" aria-label=\"Close modal\" data-micromodal-close><\/button><\/header><div id=\"polywater-modal--email-us-form-content\"><!-- [if lte IE 8]>\r\n<script charset=\"utf-8\" type=\"text\/javascript\" src=\"\/\/js.hsforms.net\/forms\/v2-legacy.js\"><\/script>\r\n<![endif]-->\r\n<script charset=\"utf-8\" type=\"text\/javascript\" src=\"\/\/js.hsforms.net\/forms\/v2.js\"><\/script>\r\n<script>\r\nhbspt.forms.create({\r\n  region: \"na1\",\r\n  portalId: \"6060295\",\r\n  formId: \"7658eeb9-0cf9-469d-a7f1-0f033127bb9d\",\r\n  onFormReady: function (a) {\r\n    a.on('change', function(){\r\n      var zip = a.find('input[name=\"zip\"]');\r\n      if( zip ) {\r\n        if( zip.val() && zip.val().length > 4 ) {\r\n          var url = \"https:\/\/api.zippopotam.us\/us\/\" + zip.val();\r\n          var client = new XMLHttpRequest();\r\n          client.open(\"GET\", url, true);\r\n          client.onreadystatechange = function() {\r\n            if(client.readyState == 4) {\r\n              var resp = JSON.parse(client.responseText);\r\n              var city = resp.places[0]['place name'];\r\n              var state = resp.places[0]['state'];\r\n              a.find('input[name=\"city\"]').val(city);\r\n              a.find('input[name=\"state\"]').val(state);\r\n            };\r\n          };\r\n          client.send();\r\n        }\r\n      }\r\n    });\r\n  },\r\n});\r\n<\/script><\/div><\/div><\/div><\/div>","protected":false},"excerpt":{"rendered":"<p>What is Coefficient of Friction or COF? Coefficient of Friction (COF) is surface resistance to movement. It is a measure&#8230;<\/p>\n","protected":false},"author":8,"featured_media":23114,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"content-type":"","_relevanssi_hide_post":"","_relevanssi_hide_content":"","_relevanssi_pin_for_all":"","_relevanssi_pin_keywords":"","_relevanssi_unpin_keywords":"","_relevanssi_related_keywords":"","_relevanssi_related_include_ids":"","_relevanssi_related_exclude_ids":"","_relevanssi_related_no_append":"","_relevanssi_related_not_related":"","_relevanssi_related_posts":"","_relevanssi_noindex_reason":"","footnotes":""},"categories":[2992,2982,2984,3013,2987,2989,3004,3006,3007,3010],"tags":[],"industry-type":[2980,2981],"writer":[2965],"class_list":["post-23104","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-underground-cabling","category-cable-in-duct-installation","category-cable-pulling","category-cable-blowing","category-friction-management","category-pull-planning","category-content-type","category-education","category-faq","category-technical-paper","industry-type-telecommunications","industry-type-electrical-infrastructure","writer-polywater-de-2"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.9 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Coefficient of Friction (COF) Explained - Polywater<\/title>\n<meta name=\"description\" content=\"Unlock Cable Pulling Efficiency: Understand Coefficient of Friction (COF). 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