--- title: Brake Pads and the Coefficient of Friction [VIDEO] description: W.C. Branham VP of Engineering and General Manager, Chad Randleman, explains the coefficient of friction in this edition of Solutions in Motion. image: https://blog.wcbranham.com/hubfs/Screenshot%202023-12-22%201.29.25%20PM.png --- [UPDATE !!! New Product Warranty Was 12-, Now 24-Months for Branham Trademark Manufactured Products. See Details... →](https://www.wcbranham.com/terms-and-conditions) [![W.C. Branham Logo](https://blog.wcbranham.com/hubfs/raw_assets/public/Wcbranham_April2024/images/wcb-logo.svg "W.C. Branham Logo")](https://www.wcbranham.com/) [Questions? 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The main three attributes to consider are the material's wear rate, the coefficient of friction (COF), and its energy capacity. W.C. Branham VP of Engineering and General Manager, Chad Randleman, explains the COF in this edition of Solutions in Motion. ## Coefficient Calculation The coefficient of friction (𝛍) is a number that is the ratio of the resistive force of friction (Fr) divided by the normal or perpendicular force (N) pushing the objects together. It is represented by the equation: 𝛍= Fr/N. Read more: [Caliper Disc Brakes in Linear Applications](https://blog.wcbranham.com/linear-brakes-caliper-disc) Basically, the coefficient of friction tells you how two surfaces will interact with each other when one is moving and a second surface is pressed against it. Here is a working example: if a block of ice were to be placed on steel, the ice would slide around freely as there is very little friction between the two materials. On the other end of the spectrum, rubber on pavement will not slide easily due to the resistance met by the two materials. The ice on steel is an example of a low COF, while the rubber on pavement is an example of a high COF. [Try Our 3D Product Configurator ►](https://cta-service-cms2.hubspot.com/web-interactives/public/v1/track/click?encryptedPayload=AVxigLJv6BpiWoV9yHKY3XP7LVgYpv5nJM6fgDyrIYnH0RCx3vKuhcQr3mxaKSTtB32xaxi%2BSt5DlqPn5UoHf6oXuD28HSBr3zsrkj9K%2BV5T%2Bs9yfEOcfqWNOGhwpDIHb2ZFgDNHpZm5xRb2QB%2BnFt4s8%2BGigaR3zoNy2H3MPmyQNa4sLg9D3cDFV2%2FEb%2BeqHHpep9c%3D&portalId=2024592) ## Range of Coefficients of Friction Before diving into numbers, it should be noted that materials react differently with lubrication. Most materials in dry conditions have COF that range between .21 and.55. There are instances where certain values go outside this range, but it’s pretty rare. A COF of .21 (on the low end) is suitable for tensioning and constant drag applications, where a low tangential force is required. High-coefficient materials are often suitable for static holding applications where you want to maximize the braking force. The different materials available to use for [brake pads](https://blog.wcbranham.com/replace-friction-pads) include organic, semi-metallic, or sintered metal. All have different energy capacity limits. Organic metal comes in at the lowest, semi-metallic in the middle, and sintered metal in the highest range. You always want to consider the energy dissipation required for your application before purchasing materials. Download our guide or speak with a representative to see what materials are right for your project. 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Branham](https://blog.wcbranham.com/author/w-c-branham) 09/27/2024 [Right Angle Gearboxes](https://blog.wcbranham.com/topic/right-angle-gearboxes) [Understanding Right-Angle Gearboxes: Different Types and Selection Tips](https://blog.wcbranham.com/selecting-a-right-angle-gearbox) --- ## Related Posts It is a long established fact that a reader will be distracted by the readable content of a page when looking at its layout. [Videos](https://blog.wcbranham.com/topic/videos), [Right Angle Gearboxes](https://blog.wcbranham.com/topic/right-angle-gearboxes) [Troy Branham](https://blog.wcbranham.com/author/troy-branham) 24 May, 2022 #### [\[VIDEO\] Right Angle Gearboxes: Answers to Common Questions](https://blog.wcbranham.com/right-angle-gearboxes) Right angle gearboxes are used in all sorts of industrial applications. This video answers some of… [Read More](https://blog.wcbranham.com/right-angle-gearboxes) [Pneumatic Actuators](https://blog.wcbranham.com/topic/pneumatic-actuators), [Videos](https://blog.wcbranham.com/topic/videos) [Troy Branham](https://blog.wcbranham.com/author/troy-branham) 01 August, 2018 #### [\[VIDEO\] How to Properly Size and Select an OVLPRO Rod Cylinder](https://blog.wcbranham.com/rod-cylinder-sizing) When looking for a cost-effective and efficient solution for your rod cylinder application, you may… [Read More](https://blog.wcbranham.com/rod-cylinder-sizing) [Pneumatic Actuators](https://blog.wcbranham.com/topic/pneumatic-actuators), [Videos](https://blog.wcbranham.com/topic/videos) [Troy Branham](https://blog.wcbranham.com/author/troy-branham) 25 April, 2018 #### [\[VIDEO\] Actuator Sizing: Cable Cylinder](https://blog.wcbranham.com/cable-cylinder-sizing) When picking the right sized cable cylinder for your pneumatic rodless cylinder application, the… [Read More](https://blog.wcbranham.com/cable-cylinder-sizing) ![W.C. 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