{"id":15700,"date":"2026-02-03T13:58:34","date_gmt":"2026-02-03T12:58:34","guid":{"rendered":"https:\/\/www.ptfe-felis.com\/differences-between-ptfe-molding-techniques\/"},"modified":"2026-08-17T16:40:07","modified_gmt":"2026-08-17T14:40:07","slug":"differences-between-ptfe-molding-techniques","status":"publish","type":"page","link":"https:\/\/www.ptfe-felis.com\/en\/differences-between-ptfe-molding-techniques\/","title":{"rendered":"Differences between PTFE molding techniques"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-page\" data-elementor-id=\"15700\" class=\"elementor elementor-15700\">\n\t\t\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-cdd2c37 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"cdd2c37\" data-element_type=\"section\" data-e-type=\"section\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-50 elementor-top-column elementor-element elementor-element-eef8167\" data-id=\"eef8167\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-74502f9 elementor-widget elementor-widget-heading\" data-id=\"74502f9\" data-element_type=\"widget\" data-e-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\">Differences between PTFE molding techniques<\/h1>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-cdcfd39 elementor-widget elementor-widget-text-editor\" data-id=\"cdcfd39\" data-element_type=\"widget\" data-e-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><strong data-start=\"88\" data-end=\"153\" data-is-last-node=\"\">Last update:\u00a0<\/strong>02\/2026<strong data-start=\"88\" data-end=\"153\" data-is-last-node=\"\">\u00a0| Written by:\u00a0<\/strong>Content Team<strong data-start=\"88\" data-end=\"153\" data-is-last-node=\"\">\u00a0| Reviewed by<\/strong><strong>:<\/strong>\u00a0<a style=\"font-weight: bold; color: white;\" href=\"https:\/\/www.ptfe-felis.com\/federico-lipparini\/\">Federico Lipparini<\/a><\/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-349df64 elementor-widget__width-initial elementor-widget-tablet__width-initial elementor-align-left elementor-widget elementor-widget-button\" data-id=\"349df64\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"button.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<div class=\"elementor-button-wrapper\">\n\t\t\t\t\t<a class=\"elementor-button elementor-button-link elementor-size-sm\" href=\"https:\/\/www.ptfe-felis.com\/en\/contatta-ptfe-felis\/\">\n\t\t\t\t\t\t<span class=\"elementor-button-content-wrapper\">\n\t\t\t\t\t\t\t\t\t<span class=\"elementor-button-text\"><b>Contact<\/b><\/span>\n\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/a>\n\t\t\t\t<\/div>\n\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<\/div>\n\t\t\t\t<div class=\"elementor-column elementor-col-50 elementor-top-column elementor-element elementor-element-0f35ebd\" data-id=\"0f35ebd\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-c53c76c elementor-widget__width-initial elementor-widget elementor-widget-image\" data-id=\"c53c76c\" data-element_type=\"widget\" data-e-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=\"233\" height=\"300\" src=\"https:\/\/www.ptfe-felis.com\/wp-content\/uploads\/2026\/02\/Differences-between-PTFE-molding-techniques-233x300.png\" class=\"attachment-medium size-medium wp-image-18385\" alt=\"Differences between PTFE molding techniques\" srcset=\"https:\/\/www.ptfe-felis.com\/wp-content\/uploads\/2026\/02\/Differences-between-PTFE-molding-techniques-233x300.png 233w, https:\/\/www.ptfe-felis.com\/wp-content\/uploads\/2026\/02\/Differences-between-PTFE-molding-techniques-796x1024.png 796w, https:\/\/www.ptfe-felis.com\/wp-content\/uploads\/2026\/02\/Differences-between-PTFE-molding-techniques-768x988.png 768w, https:\/\/www.ptfe-felis.com\/wp-content\/uploads\/2026\/02\/Differences-between-PTFE-molding-techniques-1194x1536.png 1194w, https:\/\/www.ptfe-felis.com\/wp-content\/uploads\/2026\/02\/Differences-between-PTFE-molding-techniques.png 1555w\" sizes=\"(max-width: 233px) 100vw, 233px\" title=\"\">\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<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-9b273c6 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"9b273c6\" data-element_type=\"section\" data-e-type=\"section\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-33 elementor-top-column elementor-element elementor-element-0bec486\" data-id=\"0bec486\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-b4495a8 elementor-widget elementor-widget-image\" data-id=\"b4495a8\" data-element_type=\"widget\" data-e-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 decoding=\"async\" width=\"300\" height=\"300\" src=\"https:\/\/www.ptfe-felis.com\/wp-content\/uploads\/2025\/09\/ISO-1-300x300.png\" class=\"attachment-medium size-medium wp-image-8727\" alt=\"ISO\" srcset=\"https:\/\/www.ptfe-felis.com\/wp-content\/uploads\/2025\/09\/ISO-1-300x300.png 300w, https:\/\/www.ptfe-felis.com\/wp-content\/uploads\/2025\/09\/ISO-1-150x150.png 150w, https:\/\/www.ptfe-felis.com\/wp-content\/uploads\/2025\/09\/ISO-1.png 500w\" sizes=\"(max-width: 300px) 100vw, 300px\" title=\"\">\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<div class=\"elementor-element elementor-element-f221873 elementor-widget elementor-widget-heading\" data-id=\"f221873\" data-element_type=\"widget\" data-e-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\"><b>ISO<\/b><\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-f205bc6 elementor-widget elementor-widget-text-editor\" data-id=\"f205bc6\" data-element_type=\"widget\" data-e-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>International Organization for Standardization<\/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<\/div>\n\t\t\t\t<div class=\"elementor-column elementor-col-33 elementor-top-column elementor-element elementor-element-7621c6d\" data-id=\"7621c6d\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-195c10a elementor-widget elementor-widget-image\" data-id=\"195c10a\" data-element_type=\"widget\" data-e-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 decoding=\"async\" width=\"300\" height=\"300\" src=\"https:\/\/www.ptfe-felis.com\/wp-content\/uploads\/2025\/09\/FDA-2-300x300.png\" class=\"attachment-medium size-medium wp-image-8740\" alt=\"FDA\" srcset=\"https:\/\/www.ptfe-felis.com\/wp-content\/uploads\/2025\/09\/FDA-2-300x300.png 300w, https:\/\/www.ptfe-felis.com\/wp-content\/uploads\/2025\/09\/FDA-2-150x150.png 150w, https:\/\/www.ptfe-felis.com\/wp-content\/uploads\/2025\/09\/FDA-2.png 500w\" sizes=\"(max-width: 300px) 100vw, 300px\" title=\"\">\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<div class=\"elementor-element elementor-element-3995914 elementor-widget elementor-widget-heading\" data-id=\"3995914\" data-element_type=\"widget\" data-e-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\"><b>FDA<\/b><\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-fe54923 elementor-widget elementor-widget-text-editor\" data-id=\"fe54923\" data-element_type=\"widget\" data-e-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>Administration for Foods and Drugs<\/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<\/div>\n\t\t\t\t<div class=\"elementor-column elementor-col-33 elementor-top-column elementor-element elementor-element-c2d853f\" data-id=\"c2d853f\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-c323740 elementor-widget elementor-widget-image\" data-id=\"c323740\" data-element_type=\"widget\" data-e-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 loading=\"lazy\" decoding=\"async\" width=\"300\" height=\"300\" src=\"https:\/\/www.ptfe-felis.com\/wp-content\/uploads\/2025\/09\/RoHS-1-300x300.png\" class=\"attachment-medium size-medium wp-image-8748\" alt=\"RoHS\" srcset=\"https:\/\/www.ptfe-felis.com\/wp-content\/uploads\/2025\/09\/RoHS-1-300x300.png 300w, https:\/\/www.ptfe-felis.com\/wp-content\/uploads\/2025\/09\/RoHS-1-150x150.png 150w, https:\/\/www.ptfe-felis.com\/wp-content\/uploads\/2025\/09\/RoHS-1.png 500w\" sizes=\"(max-width: 300px) 100vw, 300px\" title=\"\">\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<div class=\"elementor-element elementor-element-1fedbec elementor-widget elementor-widget-heading\" data-id=\"1fedbec\" data-element_type=\"widget\" data-e-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\"><b>RoHS<\/b><\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-548f3e1 elementor-widget elementor-widget-text-editor\" data-id=\"548f3e1\" data-element_type=\"widget\" data-e-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>Restriction of Hazardous Substances<\/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<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-6254e7e elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"6254e7e\" data-element_type=\"section\" data-e-type=\"section\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-5c746c7\" data-id=\"5c746c7\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-fcbc0c0 elementor-widget elementor-widget-hfe-breadcrumbs-widget\" data-id=\"fcbc0c0\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"hfe-breadcrumbs-widget.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<nav aria-label=\"Breadcrumb\"><ul class=\"hfe-breadcrumbs hfe-breadcrumbs-show-home\"><li class=\"hfe-breadcrumbs-item hfe-breadcrumbs-first\"><span class=\"hfe-breadcrumbs-home-icon\"><i aria-hidden=\"true\" class=\"fas fa-home\"><\/i><\/span><a href=\"https:\/\/www.ptfe-felis.com\/en\/\"><span class=\"hfe-breadcrumbs-text\">Initial Page<\/span><\/a><\/li><\/ul><\/nav>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-6a73c91 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"6a73c91\" data-element_type=\"section\" data-e-type=\"section\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-1761aff\" data-id=\"1761aff\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-86bd65c elementor-widget elementor-widget-text-editor\" data-id=\"86bd65c\" data-element_type=\"widget\" data-e-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><span style=\"font-weight: 400;\">Polytetrafluoroethylene (PTFE) is a high-performance <a href=\"https:\/\/www.ptfe-felis.com\/en\/fluoropolymer\/\">fluoropolymer<\/a> widely used in industries ranging from aerospace, chemical processing, medical devices, and electronics to mechanical components. Unlike conventional <a href=\"https:\/\/www.ptfe-felis.com\/en\/thermoplastics\/\">thermoplastics<\/a>, PTFE cannot be processed by simple melting and injection molding due to its <\/span><b>extremely high melt <a href=\"https:\/\/www.ptfe-felis.com\/en\/viscosity\/\">viscosity<\/a><\/b><span style=\"font-weight: 400;\"> and the absence of a true melt flow. This unique behavior requires specialized molding techniques that enable shaping, densification, and subsequent sintering to produce solid, chemically resistant, and mechanically stable components.<\/span><\/p><p><span style=\"font-weight: 400;\">The most commonly used PTFE molding techniques include <\/span><b>compression molding<\/b><span style=\"font-weight: 400;\">, <\/span><b>ram extrusion<\/b><span style=\"font-weight: 400;\">, and <\/span><b>paste extrusion or injection<\/b><span style=\"font-weight: 400;\">. Each method has unique characteristics, advantages, limitations, and suitable applications. Selecting the appropriate technique requires a detailed understanding of geometry, mechanical property requirements, production volume, surface finish, and post-processing needs. This article explores these molding methods in detail, highlighting their differences, practical applications, and design considerations for high-quality PTFE components.<\/span><\/p><div style=\"margin: 40px 0; padding: 30px; background: #2c2cf6; border-radius: 8px; text-align: center;\"><h3 style=\"margin: 0 0 10px 0; font-size: 22px; color: #ffffff;\"><strong>Request Your PTFE Quote<\/strong><\/h3><p style=\"margin: 0 0 20px 0; font-size: 16px; color: #ffffff;\"><strong>Worldwide delivery and certified PTFE products.<\/strong><\/p><p><a style=\"display: inline-block; padding: 14px 28px; background: white; color: #000000; text-decoration: none; font-size: 16px; font-weight: 600; border-radius: 6px;\" href=\"https:\/\/www.ptfe-felis.com\/en\/contact-ptfe-felis\/\" target=\"_blank\" rel=\"follow noopener\">Get a Free Quote<br \/><\/a><\/p><\/div><h2><b>1. Compression Molding<\/b><\/h2><h3><b>Process Overview<\/b><\/h3><p><span style=\"font-weight: 400;\"><a href=\"https:\/\/www.ptfe-felis.com\/en\/compression-molding\/\">Compression molding<\/a> is the <\/span><b>traditional and most widely used <a href=\"https:\/\/www.ptfe-felis.com\/en\/what-is-ptfe\/\">PTFE<\/a> molding technique<\/b><span style=\"font-weight: 400;\">. It involves placing PTFE powder either virgin or filled into a mold cavity. High pressure, typically ranging from <\/span><b>20 to 70 MPa<\/b><span style=\"font-weight: 400;\">, is applied to compact the powder into a cohesive \u201cgreen\u201d part. After compaction, the part undergoes <\/span><b>sintering in a high-temperature oven<\/b><span style=\"font-weight: 400;\">, where particles fuse together to form a dense, solid component.<\/span><\/p><h3><b>Characteristics<\/b><\/h3><ul><li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Produces <\/span><b>dense, high-strength components<\/b><span style=\"font-weight: 400;\"> with excellent mechanical properties.<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Works best for <\/span><b>simple geometries<\/b><span style=\"font-weight: 400;\">, including sheets, rods, bushings, and seals.<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Exhibits <\/span><b>minimal shrinkage<\/b><span style=\"font-weight: 400;\"> compared to extrusion techniques due to uniform compaction.<\/span><\/li><\/ul><h3><b>Advantages<\/b><\/h3><ol><li style=\"font-weight: 400;\" aria-level=\"1\"><b>High dimensional accuracy<\/b><span style=\"font-weight: 400;\">: The dense packing of powder reduces post-sintering distortions.<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><b>Excellent mechanical strength<\/b><span style=\"font-weight: 400;\">: Sintered parts exhibit maximum tensile strength and <a href=\"https:\/\/www.ptfe-felis.com\/en\/creep\/\">creep<\/a> resistance.<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><b>Chemical resistance<\/b><span style=\"font-weight: 400;\">: Fully maintains PTFE\u2019s inertness.<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><b>Compatibility with filled PTFE<\/b><span style=\"font-weight: 400;\">: Glass, <a href=\"https:\/\/www.ptfe-felis.com\/en\/carbon\/\">carbon<\/a>, and bronze-filled grades can be compressed without compromising density.<\/span><\/li><\/ol><h3><b>Limitations<\/b><\/h3><ul><li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Not suitable for <\/span><b>complex or intricate geometries<\/b><span style=\"font-weight: 400;\"> due to mold accessibility limitations.<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><b>Slower process for high-volume production<\/b><span style=\"font-weight: 400;\">, as each part requires separate molding and sintering cycles.<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Requires <\/span><b>post-sintering machining<\/b><span style=\"font-weight: 400;\"> for precision features in some cases.<\/span><\/li><\/ul><p><b>Applications:<\/b><span style=\"font-weight: 400;\"> Compression molding is ideal for components requiring <\/span><b>high strength and chemical resistance<\/b><span style=\"font-weight: 400;\">, such as <\/span><b>flat sheets, bushings, seals, washers, and simple rods<\/b><span style=\"font-weight: 400;\">.<\/span><\/p><h2><b>2. Ram (Paste) Extrusion<\/b><\/h2><h3><b>Process Overview<\/b><\/h3><p><span style=\"font-weight: 400;\">Ram extrusion, often called <\/span><b>paste extrusion<\/b><span style=\"font-weight: 400;\">, is used to produce <\/span><b>continuous shapes<\/b><span style=\"font-weight: 400;\"> like rods, tubes, and sheets. In this method, PTFE powder is mixed with a <\/span><b>temporary lubricant<\/b><span style=\"font-weight: 400;\"> to form a paste. This paste is forced through a <\/span><b>die<\/b><span style=\"font-weight: 400;\"> using hydraulic or mechanical pressure to achieve the desired cross-sectional shape. After extrusion, the <a href=\"https:\/\/www.ptfe-felis.com\/en\/lubricant\/\">lubricant<\/a> is removed, and the part is sintered to achieve full density and mechanical integrity.<\/span><\/p><h3><b>Characteristics<\/b><\/h3><ul><li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Produces <\/span><b>long, continuous components<\/b><span style=\"font-weight: 400;\">.<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Can accommodate <\/span><b>moderately complex cross-sectional profiles<\/b><span style=\"font-weight: 400;\">, including non-circular shapes.<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">The resulting part generally has <\/span><b>uniform density and consistent mechanical properties<\/b><span style=\"font-weight: 400;\"> along its length.<\/span><\/li><\/ul><h3><b>Advantages<\/b><\/h3><ol><li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Suitable for <\/span><b>continuous production<\/b><span style=\"font-weight: 400;\"> of rods, tubes, and profiles.<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><b>Uniform cross-section and density<\/b><span style=\"font-weight: 400;\"> reduce the need for extensive post-processing.<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><b>Compatible with filled PTFE<\/b><span style=\"font-weight: 400;\">, including glass, carbon, and bronze reinforcements.<\/span><\/li><\/ol><h3><b>Limitations<\/b><\/h3><ul><li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Requires a <\/span><b>lubricant removal step<\/b><span style=\"font-weight: 400;\">, which adds time and complexity.<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><b>Post-sintering machining<\/b><span style=\"font-weight: 400;\"> may still be necessary for tight tolerances or precision features.<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Not ideal for <\/span><b>highly intricate 3D shapes<\/b><span style=\"font-weight: 400;\"> or thin-walled components.<\/span><\/li><\/ul><p><b>Applications:<\/b><span style=\"font-weight: 400;\"> Ram extrusion is widely used for <\/span><b>tubing, cylindrical rods, profiles, and sheets<\/b><span style=\"font-weight: 400;\"> that require <\/span><b>moderate complexity and continuous lengths<\/b><span style=\"font-weight: 400;\">. It is especially useful for applications where <\/span><b>mechanical consistency over long runs<\/b><span style=\"font-weight: 400;\"> is critical, such as chemical processing lines, <a href=\"https:\/\/www.ptfe-felis.com\/en\/electrical-insulation\/\">electrical insulation<\/a> tubes, or guide rods.<\/span><\/p><h2><b>3. Paste Extrusion \/ Injection (for Fine or Complex Shapes)<\/b><\/h2><h3><b>Process Overview<\/b><\/h3><p><span style=\"font-weight: 400;\">Paste extrusion or injection molding is a specialized PTFE process for producing <\/span><b>complex, thin-walled, or delicate components<\/b><span style=\"font-weight: 400;\">. PTFE powder is blended with a <\/span><b>liquid lubricant<\/b><span style=\"font-weight: 400;\"> to form a paste, which can be injected or extruded into <\/span><b>intricate molds<\/b><span style=\"font-weight: 400;\">. After forming, the lubricant is removed, and the part undergoes sintering to consolidate the material.<\/span><\/p><h3><b>Characteristics<\/b><\/h3><ul><li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Similar to ram extrusion but allows <\/span><b>higher geometric complexity<\/b><span style=\"font-weight: 400;\">, including <\/span><b>thin walls and intricate cavities<\/b><span style=\"font-weight: 400;\">.<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Particularly useful for <\/span><b>delicate, small, or precision-engineered components<\/b><span style=\"font-weight: 400;\">.<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Can produce parts with <\/span><b>high surface finish quality<\/b><span style=\"font-weight: 400;\"> after sintering.<\/span><\/li><\/ul><h3><b>Advantages<\/b><\/h3><ol><li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Enables <\/span><b>complex shapes<\/b><span style=\"font-weight: 400;\"> that are impossible with compression molding.<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Produces <\/span><b>thin-walled components<\/b><span style=\"font-weight: 400;\"> for applications with tight spatial constraints.<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Can incorporate <\/span><b>filled PTFE grades<\/b><span style=\"font-weight: 400;\"> to enhance mechanical properties or wear resistance.<\/span><\/li><\/ol><h3><b>Limitations<\/b><\/h3><ul><li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Lubricant removal and sintering are <\/span><b>time-consuming and require precise control<\/b><span style=\"font-weight: 400;\">.<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Mechanical properties may be <\/span><b>slightly lower than compression-molded parts<\/b><span style=\"font-weight: 400;\"> due to paste processing.<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Limited efficiency for <\/span><b>high-volume large-scale production<\/b><span style=\"font-weight: 400;\">.<\/span><\/li><\/ul><p><b>Applications:<\/b><span style=\"font-weight: 400;\"> Paste extrusion or injection is suitable for <\/span><b>thin-walled seals, complex electrical insulators, intricate laboratory fittings, and precision components<\/b><span style=\"font-weight: 400;\"> in medical or aerospace applications.<\/span><\/p><h2><b>4. Comparison Table of PTFE Molding Techniques<\/b><\/h2><table><tbody><tr><td><b>Feature<\/b><\/td><td><b>Compression Molding<\/b><\/td><td><b>Ram Extrusion<\/b><\/td><td><b>Paste Extrusion \/ Injection<\/b><\/td><\/tr><tr><td><span style=\"font-weight: 400;\">Shape Complexity<\/span><\/td><td><span style=\"font-weight: 400;\">Simple<\/span><\/td><td><span style=\"font-weight: 400;\">Moderate<\/span><\/td><td><span style=\"font-weight: 400;\">Complex<\/span><\/td><\/tr><tr><td><span style=\"font-weight: 400;\">Typical Products<\/span><\/td><td><span style=\"font-weight: 400;\">Sheets, rods, bushings, seals<\/span><\/td><td><span style=\"font-weight: 400;\">Rods, tubes, profiles<\/span><\/td><td><span style=\"font-weight: 400;\">Thin-walled, intricate components<\/span><\/td><\/tr><tr><td><span style=\"font-weight: 400;\">Mechanical Properties<\/span><\/td><td><span style=\"font-weight: 400;\">Excellent<\/span><\/td><td><span style=\"font-weight: 400;\">Good<\/span><\/td><td><span style=\"font-weight: 400;\">Moderate<\/span><\/td><\/tr><tr><td><span style=\"font-weight: 400;\">Fillers Compatible<\/span><\/td><td><span style=\"font-weight: 400;\">Yes<\/span><\/td><td><span style=\"font-weight: 400;\">Yes<\/span><\/td><td><span style=\"font-weight: 400;\">Yes<\/span><\/td><\/tr><tr><td><span style=\"font-weight: 400;\">Production Volume<\/span><\/td><td><span style=\"font-weight: 400;\">Low-Medium<\/span><\/td><td><span style=\"font-weight: 400;\">Medium-High<\/span><\/td><td><span style=\"font-weight: 400;\">Low-Medium<\/span><\/td><\/tr><tr><td><span style=\"font-weight: 400;\">Post-Machining Required<\/span><\/td><td><span style=\"font-weight: 400;\">Sometimes<\/span><\/td><td><span style=\"font-weight: 400;\">Often<\/span><\/td><td><span style=\"font-weight: 400;\">Often<\/span><\/td><\/tr><tr><td><span style=\"font-weight: 400;\">Shrinkage<\/span><\/td><td><span style=\"font-weight: 400;\">Minimal<\/span><\/td><td><span style=\"font-weight: 400;\">Moderate<\/span><\/td><td><span style=\"font-weight: 400;\">Moderate<\/span><\/td><\/tr><tr><td><span style=\"font-weight: 400;\">Surface Finish<\/span><\/td><td><span style=\"font-weight: 400;\">Good<\/span><\/td><td><span style=\"font-weight: 400;\">Good<\/span><\/td><td><span style=\"font-weight: 400;\">Excellent<\/span><\/td><\/tr><\/tbody><\/table><h2><b>5. Design Considerations Based on Molding Technique<\/b><\/h2><h3><b>Compression Molding<\/b><\/h3><ul><li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Best for <\/span><b>high-strength, dense parts<\/b><span style=\"font-weight: 400;\"> with <\/span><b>simple geometry<\/b><span style=\"font-weight: 400;\">.<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Ideal for <\/span><b>seals, bushings, washers, and flat sheets<\/b><span style=\"font-weight: 400;\">.<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Minimize post-machining requirements where possible.<\/span><\/li><\/ul><h3><b>Ram Extrusion<\/b><\/h3><ul><li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Suitable for <\/span><b>long, continuous profiles<\/b><span style=\"font-weight: 400;\"> such as <\/span><b>tubing, rods, and sheets<\/b><span style=\"font-weight: 400;\">.<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Design components with allowance for <\/span><b>post-sintering machining<\/b><span style=\"font-weight: 400;\"> if tight tolerances are needed.<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Consider die design to maintain uniform density and wall thickness.<\/span><\/li><\/ul><h3><b>Paste Extrusion \/ Injection<\/b><\/h3><ul><li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Best for <\/span><b>complex, thin-walled, or delicate components<\/b><span style=\"font-weight: 400;\">.<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Requires <\/span><b>careful lubricant removal and controlled sintering<\/b><span style=\"font-weight: 400;\"> to prevent voids or distortion.<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Suitable for parts requiring <\/span><b>precision surface finish and intricate geometry<\/b><span style=\"font-weight: 400;\">.<\/span><\/li><\/ul><h2><b>6. Conclusion<\/b><\/h2><p><span style=\"font-weight: 400;\">Selecting the <\/span><b>right PTFE molding technique<\/b><span style=\"font-weight: 400;\"> is critical for achieving <\/span><b>mechanical performance, chemical resistance, and dimensional stability<\/b><span style=\"font-weight: 400;\">. Key considerations include:<\/span><\/p><ul><li style=\"font-weight: 400;\" aria-level=\"1\"><b>Compression molding<\/b><span style=\"font-weight: 400;\">: Best for <\/span><b>high-strength, simple shapes<\/b><span style=\"font-weight: 400;\"> with minimal shrinkage.<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><b>Ram extrusion<\/b><span style=\"font-weight: 400;\">: Ideal for <\/span><b>continuous profiles<\/b><span style=\"font-weight: 400;\"> and moderate complexity, such as rods, tubes, and sheets.<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><b>Paste extrusion\/injection<\/b><span style=\"font-weight: 400;\">: Suitable for <\/span><b>intricate, thin-walled, or delicate parts<\/b><span style=\"font-weight: 400;\"> that cannot be produced with other methods.<\/span><\/li><\/ul><p><span style=\"font-weight: 400;\">Understanding the differences in <\/span><b>shrinkage, mechanical properties, surface finish, post-processing needs, and production efficiency<\/b><span style=\"font-weight: 400;\"> ensures optimal component performance and cost-effective manufacturing.<\/span><\/p><h2><b>Frequently Asked Questions (FAQs)<\/b><\/h2><p><b>Q1: Can PTFE be injection molded like other plastics?<\/b><b><br \/><\/b> <b>A1:<\/b><span style=\"font-weight: 400;\"> No. PTFE cannot flow in the melt state. It must be shaped as <\/span><b>powder or paste<\/b><span style=\"font-weight: 400;\"> and then sintered to form a solid, cohesive component.<\/span><\/p><p><b>Q2: Which molding method provides the highest mechanical strength?<\/b><b><br \/><\/b> <b>A2:<\/b> <b>Compression molding<\/b><span style=\"font-weight: 400;\"> produces the densest and strongest PTFE parts due to uniform particle compaction and minimal voids.<\/span><\/p><p><b>Q3: Can filled PTFE be molded by all techniques?<\/b><b><br \/><\/b> <b>A3:<\/b><span style=\"font-weight: 400;\"> Yes. PTFE filled with <\/span><b>glass, carbon, or bronze<\/b><span style=\"font-weight: 400;\"> is compatible with <\/span><b>compression molding, ram extrusion, and paste extrusion\/injection<\/b><span style=\"font-weight: 400;\">.<\/span><\/p><p><b>Q4: Why is post-machining often required?<\/b><b><br \/><\/b> <b>A4:<\/b><span style=\"font-weight: 400;\"> Sintered PTFE parts may experience <\/span><b>slight shrinkage or dimensional variations<\/b><span style=\"font-weight: 400;\">, necessitating <\/span><b>precision machining<\/b><span style=\"font-weight: 400;\"> for tight-tolerance applications.<\/span><\/p><p><b>Q5: Which method is best for complex, thin-walled parts?<\/b><b><br \/><\/b> <b>A5:<\/b> <b>Paste extrusion or injection molding<\/b><span style=\"font-weight: 400;\"> allows production of <\/span><b>intricate shapes<\/b><span style=\"font-weight: 400;\"> that cannot be made using compression molding.<\/span><\/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<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-8d6bbdb elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"8d6bbdb\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-854c6bf\" data-id=\"854c6bf\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-26f3ffd elementor-widget elementor-widget-heading\" data-id=\"26f3ffd\" data-element_type=\"widget\" data-e-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\">Related Post<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-60aa287 elementor-widget elementor-widget-text-editor\" data-id=\"60aa287\" data-element_type=\"widget\" data-e-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<ol><li><a href=\"https:\/\/www.ptfe-felis.com\/en\/compression-molding\/\"><span data-sheets-root=\"1\">compression molding?<\/span><\/a><\/li><li><a href=\"https:\/\/www.ptfe-felis.com\/en\/ptfe-extrusion-vs-compression-molding\/\"><span data-sheets-root=\"1\">PTFE extrusion vs compression molding?<\/span><\/a><\/li><li><a href=\"https:\/\/www.ptfe-felis.com\/en\/designing-components-with-ptfe\/\"><span data-sheets-root=\"1\">Designing components with PTFE?<\/span><\/a><\/li><li><a href=\"https:\/\/www.ptfe-felis.com\/en\/top-ptfe-manufacturers-in-germany\/\"><span data-sheets-root=\"1\">Top PTFE Manufacturers in Germany<\/span><\/a><\/li><\/ol>\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<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>Differences between PTFE molding techniques Last update:\u00a002\/2026\u00a0| Written by:\u00a0Content Team\u00a0| Reviewed by:\u00a0Federico Lipparini Contact ISO International Organization for Standardization FDA Administration for Foods and Drugs RoHS Restriction of Hazardous Substances Initial Page Polytetrafluoroethylene (PTFE) is a high-performance fluoropolymer widely used in industries ranging from aerospace, chemical processing, medical devices, and electronics to mechanical components. Unlike [&hellip;]<\/p>\n","protected":false},"author":8,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-15700","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.ptfe-felis.com\/en\/wp-json\/wp\/v2\/pages\/15700","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.ptfe-felis.com\/en\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/www.ptfe-felis.com\/en\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/www.ptfe-felis.com\/en\/wp-json\/wp\/v2\/users\/8"}],"replies":[{"embeddable":true,"href":"https:\/\/www.ptfe-felis.com\/en\/wp-json\/wp\/v2\/comments?post=15700"}],"version-history":[{"count":48,"href":"https:\/\/www.ptfe-felis.com\/en\/wp-json\/wp\/v2\/pages\/15700\/revisions"}],"predecessor-version":[{"id":45726,"href":"https:\/\/www.ptfe-felis.com\/en\/wp-json\/wp\/v2\/pages\/15700\/revisions\/45726"}],"wp:attachment":[{"href":"https:\/\/www.ptfe-felis.com\/en\/wp-json\/wp\/v2\/media?parent=15700"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}