{"id":3978,"date":"2026-05-06T06:41:03","date_gmt":"2026-05-06T06:41:03","guid":{"rendered":"https:\/\/www.symachining.com\/?p=3978"},"modified":"2026-05-06T06:52:40","modified_gmt":"2026-05-06T06:52:40","slug":"peek-vs-delrin-for-cnc-machining","status":"publish","type":"post","link":"https:\/\/www.symachining.com\/fr\/peek-vs-delrin-for-cnc-machining\/","title":{"rendered":"PEEK vs. Delrin for CNC Machining"},"content":{"rendered":"

Welcome back! In\u00a0Part 1<\/a><\/strong>, we covered the chemistry, thermal performance, chemical resistance, and raw material sourcing for\u00a0PEEK machined parts<\/strong>\u00a0et\u00a0Delrin machined parts<\/strong>. You learned about rod sizes, sheet dimensions, tube availability, colors, and the significant price difference between these two engineering plastics.<\/p>\n

Now, in\u00a0Part 2<\/strong>, we will focus on what happens when the raw material meets the cutting tool. We will compare mechanical properties, provide specific machining guidelines, explore real-world applications, and help you make a final selection based on your industry\u2014whether you work in\u00a0medical device manufacturing<\/strong>,\u00a0aerospace components<\/strong>, or general industrial automation.<\/p>\n

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Mechanical Properties: Strength, Stiffness, and Wear<\/h2>\n

When comparing\u00a0PEEK machined parts<\/strong>\u00a0versus\u00a0Delrin machined parts<\/strong>, the mechanical requirements of the application dictate the choice.<\/p>\n

Tensile Strength and Stiffness<\/h3>\n

PEEK is the clear winner in high-stress environments. Unfilled PEEK typically offers a tensile strength of around 14,000 psi, while glass- or carbon-filled variants can exceed 30,000 psi. Delrin offers respectable tensile strength\u2014approximately 10,000 psi\u2014but it softens and loses stiffness at elevated temperatures far sooner than PEEK.<\/p>\n

For components that must maintain structural integrity under continuous load at room temperature, Delrin is often sufficient. However, for applications involving sustained stress, high impact, or elevated temperatures, PEEK is the superior choice.<\/p>\n

Friction and Wear<\/h3>\n

Both materials are favored for bearing and wear applications, but they behave differently.<\/p>\n

Delrin has a very low dynamic coefficient of friction (around 0.2 against steel), and we often use it for gears, bushings, and conveyor components. It runs quietly against metal counterparts and requires minimal lubrication.<\/p>\n

PEEK, particularly when reinforced with carbon fiber, offers exceptional wear resistance and a lower coefficient of friction than Delrin in high-load or high-temperature scenarios. While Delrin may perform better in clean, room-temperature environments, PEEK excels in dirty, abrasive, or high-PV (pressure-velocity) applications.<\/p>\n

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Precision Engineering and Machinability<\/h2>\n

Both materials are considered excellent candidates for\u00a0ing\u00e9nierie de pr\u00e9cision<\/strong>, but their machining behaviors differ significantly.<\/p>\n

Machining Delrin<\/h3>\n

Delrin is often described as one of the most machinable plastics. It produces long, continuous chips that are easily evacuated from the cutting zone. It maintains tight tolerances (\u00b10.001 inches or better) without requiring extensive post-machining stress relief. However, because Delrin has a relatively low melting point, machinists must avoid excessive heat buildup, which can cause localized melting or burr formation.<\/p>\n

Key considerations for Delrin machining:<\/strong><\/p>\n