{"id":1545,"date":"2026-04-07T10:59:58","date_gmt":"2026-04-07T02:59:58","guid":{"rendered":"https:\/\/www.bosssealing.com\/?post_type=product&#038;p=1545"},"modified":"2026-04-07T11:08:01","modified_gmt":"2026-04-07T03:08:01","slug":"spring-energized-seal-for-vacuum-applications","status":"publish","type":"product","link":"https:\/\/www.bosssealing.com\/zh\/product\/spring-energized-seal-for-vacuum-applications\/","title":{"rendered":"Spring Energized Seal for Vacuum Applications"},"content":{"rendered":"<p><strong><img decoding=\"async\" class=\"alignright wp-image-1546 size-thumbnail\" src=\"https:\/\/www.bosssealing.com\/wp-content\/uploads\/2026\/04\/Spring-Energized-Seal-\u2013-Product-Overview-for-Vacuum-Service-150x150.png\" alt=\"\" width=\"150\" height=\"150\" srcset=\"https:\/\/www.bosssealing.com\/wp-content\/uploads\/2026\/04\/Spring-Energized-Seal-\u2013-Product-Overview-for-Vacuum-Service-150x150.png 150w, https:\/\/www.bosssealing.com\/wp-content\/uploads\/2026\/04\/Spring-Energized-Seal-\u2013-Product-Overview-for-Vacuum-Service-300x300.png 300w, https:\/\/www.bosssealing.com\/wp-content\/uploads\/2026\/04\/Spring-Energized-Seal-\u2013-Product-Overview-for-Vacuum-Service-12x12.png 12w, https:\/\/www.bosssealing.com\/wp-content\/uploads\/2026\/04\/Spring-Energized-Seal-\u2013-Product-Overview-for-Vacuum-Service-100x100.png 100w, https:\/\/www.bosssealing.com\/wp-content\/uploads\/2026\/04\/Spring-Energized-Seal-\u2013-Product-Overview-for-Vacuum-Service.png 600w\" sizes=\"(max-width: 150px) 100vw, 150px\" \/><\/strong><\/p>\n<p class=\"ds-markdown-paragraph\" style=\"text-align: left;\"><strong>Introduction<\/strong><strong>\u00a0<\/strong><br \/>\nA spring energized seal, also known as a spring-energized PTFE seal or spring-energized O-ring substitute, is a high-performance sealing device designed for extreme conditions where conventional rubber seals fail. It is particularly suitable for vacuum applications, including high and ultra-high vacuum systems.<\/p>\n<p class=\"ds-markdown-paragraph\"><strong>Core Structure and Working Principle<\/strong><br \/>\nThe seal consists of two main parts: a metal spring and a polymer jacket, typically made of PTFE or other high-performance plastics. The jacket is shaped like a &#8220;U&#8221; or &#8220;C&#8221;, and the spring is inserted inside.<\/p>\n<ul>\n<li>\n<p class=\"ds-markdown-paragraph\">In static vacuum service, the spring provides an initial preload force that pushes the sealing lips against the metal gland surfaces, creating a reliable seal even under negative pressure or full vacuum.<\/p>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\">When system pressure rises, the pressurized fluid enters the cavity behind the spring and adds to the spring force, further energizing the seal \u2013 the higher the pressure, the tighter the seal.<\/p>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\">Over time, the spring continuously compensates for wear of the <a href=\"https:\/\/www.trelleborg.com\/en\/offerings\">polymer<\/a> jacket, ensuring a long service life.<\/p>\n<\/li>\n<\/ul>\n<p class=\"ds-markdown-paragraph\"><strong>Key Advantages for Vacuum Applications<\/strong><\/p>\n<ol start=\"1\">\n<li>\n<p class=\"ds-markdown-paragraph\"><strong>Extremely low outgassing<\/strong>\u00a0\u2013 PTFE and other engineering plastics have inherently low outgassing rates, making them ideal for ultra-high vacuum systems and avoiding contamination issues common with elastomers.<\/p>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong>Excellent chemical resistance<\/strong>\u00a0\u2013 PTFE is inert to almost all chemicals except molten alkali metals and high-temperature fluorine gas.<\/p>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong>Wide temperature range<\/strong>\u00a0\u2013 PTFE-based seals operate from -200\u00b0C up to +260\u00b0C. Special materials like PEEK can extend the range to -270\u00b0C to +315\u00b0C.<\/p>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong>Low friction and stick-slip free<\/strong>\u00a0\u2013 PTFE has a very low coefficient of friction (0.02-0.1). Combined with a constant spring force, the seal moves smoothly even at very low speeds without stick-slip.<\/p>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong>Superior sealing performance<\/strong>\u00a0\u2013 Helium leak rates below 1\u00d710\u207b\u2079 Pa\u00b7m\u00b3\/s are achievable in static vacuum conditions.<\/p>\n<\/li>\n<\/ol>\n<p class=\"ds-markdown-paragraph\"><strong>Materials and Spring Types<\/strong><\/p>\n<p class=\"ds-markdown-paragraph\"><em>Polymer Jacket Materials:<\/em><\/p>\n<ul>\n<li>\n<p class=\"ds-markdown-paragraph\">Virgin PTFE \u2013 basic material, good chemical resistance, low friction.<\/p>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\">Filled PTFE (with carbon, glass fiber, graphite, etc.) \u2013 improved wear resistance, compressive strength, and thermal conductivity.<\/p>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\">PEEK \u2013 higher temperature capability (above 300\u00b0C), high mechanical strength, suitable for extreme high temperature and pressure.<\/p>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\">Other special plastics \u2013 PCTFE, UHMW-PE, Polyimide, etc. for specific requirements.<\/p>\n<\/li>\n<\/ul>\n<p class=\"ds-markdown-paragraph\"><em>Spring Materials:<\/em><\/p>\n<ul>\n<li>\n<p class=\"ds-markdown-paragraph\">Stainless steel (301, 304, 316L) \u2013 common choice, good elasticity and corrosion resistance.<\/p>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\">Nickel alloys (Inconel, Hastelloy) \u2013 excellent high-temperature and corrosion resistance.<\/p>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\">Cobalt alloys (Elgiloy) \u2013 superior elasticity, corrosion resistance, and fatigue strength.<\/p>\n<\/li>\n<\/ul>\n<p class=\"ds-markdown-paragraph\"><em>Spring Configurations:<\/em><\/p>\n<ul>\n<li>\n<p class=\"ds-markdown-paragraph\">V\u2011spring \u2013 cantilever design, medium to high load, for reciprocating motion.<\/p>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\">U\u2011spring \u2013 higher initial load, for face seals or static\/low speed applications.<\/p>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\">Helical spring \u2013 large deflection range, for large diameters or low pressure.<\/p>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\">Slant coil spring (C\u2011type) \u2013 constant load in both axial and radial directions, for multi-directional sealing.<\/p>\n<\/li>\n<\/ul>\n<p class=\"ds-markdown-paragraph\"><strong>Typical Technical Specifications for Vacuum<\/strong><\/p>\n<ul>\n<li>\n<p class=\"ds-markdown-paragraph\">Achievable vacuum level: High vacuum (10\u207b\u2075 Pa) to ultra-high vacuum (10\u207b\u2077 Pa).<\/p>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\">Temperature range: -200\u00b0C to +260\u00b0C (PTFE) \/ up to +315\u00b0C (PEEK).<\/p>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\">Pressure range: Vacuum to 80 MPa (spring provides initial seal at zero pressure).<\/p>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\">Speed capability: Reciprocating up to 2 m\/s; rotary up to 20 m\/s.<\/p>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\">Standard groove: Can be designed to AS 568A O-ring gland dimensions for easy retrofit.<\/p>\n<\/li>\n<\/ul>\n<p class=\"ds-markdown-paragraph\"><strong>Typical Applications<\/strong><\/p>\n<ul>\n<li>\n<p class=\"ds-markdown-paragraph\">Semiconductor manufacturing \u2013 PVD, CVD, etching chambers requiring high cleanliness and plasma resistance.<\/p>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\">Research equipment \u2013 SEM, TEM, mass spectrometers, surface analysis instruments.<\/p>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\">Aerospace \u2013 hydraulic systems, fuel systems, valves in space environments.<\/p>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\">Food and medical \u2013 PTFE is biocompatible and FDA compliant.<\/p>\n<\/li>\n<\/ul>\n<p class=\"ds-markdown-paragraph\"><strong>Installation Notes for Vacuum Service<\/strong><\/p>\n<ul>\n<li>\n<p class=\"ds-markdown-paragraph\">The sealing groove surface should have a fine finish, recommended Ra \u2264 0.4 \u03bcm.<\/p>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\">For ultra-high vacuum, no grease or oil should be used; the PTFE jacket is self-lubricating.<\/p>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\">Ensure no burrs or scratches on the gland or the seal before installation.<\/p>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\">The open side of the U\u2011shaped jacket must face the pressure source or the fluid side.<\/p>\n<\/li>\n<\/ul>\n<p class=\"ds-markdown-paragraph\"><strong>Summary<\/strong><br \/>\nThe spring energized seal offers a unique combination of low outgassing, wide temperature capability, chemical inertness, and long life. It is the preferred sealing solution for demanding vacuum systems where traditional elastomer seals are not adequate.<\/p>\n<p>Any request for your machine, please contact us:<\/p>\n<p>\u96fb\u5b50\u90f5\u4ef6\uff1a <a href=\"https:\/\/www.bosssealing.com\/zh\/contact-us\/\">sales@bosssealing.com<\/a><\/p>\n<p>WhatsApp:+86 13392768056<\/p>","protected":false},"excerpt":{"rendered":"<p>Introduction\u00a0 A spring energized seal, also known as a spring-energized PTFE seal or spring-energized O-ring substitute, is a high-performance sealing device designed for extreme conditions where conventional rubber seals fail. It is particularly suitable for vacuum applications, including high and ultra-high vacuum systems. Core Structure and Working Principle The seal consists of two main parts: [&hellip;]<\/p>\n","protected":false},"featured_media":1547,"template":"","meta":{"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0},"product_brand":[],"product_cat":[31],"product_tag":[],"class_list":{"0":"post-1545","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_cat-spring-energized-seals-vari-seal","8":"first","9":"instock","10":"shipping-taxable","11":"product-type-simple"},"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/www.bosssealing.com\/zh\/wp-json\/wp\/v2\/product\/1545","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.bosssealing.com\/zh\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/www.bosssealing.com\/zh\/wp-json\/wp\/v2\/types\/product"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.bosssealing.com\/zh\/wp-json\/wp\/v2\/media\/1547"}],"wp:attachment":[{"href":"https:\/\/www.bosssealing.com\/zh\/wp-json\/wp\/v2\/media?parent=1545"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/www.bosssealing.com\/zh\/wp-json\/wp\/v2\/product_brand?post=1545"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/www.bosssealing.com\/zh\/wp-json\/wp\/v2\/product_cat?post=1545"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/www.bosssealing.com\/zh\/wp-json\/wp\/v2\/product_tag?post=1545"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}