{"id":12633,"date":"2024-09-13T10:29:10","date_gmt":"2024-09-13T02:29:10","guid":{"rendered":"https:\/\/www.hencolin.com\/news\/%e6%b7%b1%e5%85%a5%e4%ba%86%e8%a7%a3dop%e5%92%8cpao%e6%aa%a2%e6%b8%ac%ef%bc%9a%e7%a9%ba%e6%b0%a3%e9%81%8e%e6%bf%be%e5%99%a8%e6%80%a7%e8%83%bd%e6%b8%ac%e8%a9%a6%e7%9a%84%e6%a0%b8%e5%bf%83%e6%8a%80\/"},"modified":"2026-07-09T16:18:27","modified_gmt":"2026-07-09T08:18:27","slug":"dop-and-pao-testing-guide-for-hepa-ulpa-filters","status":"publish","type":"post","link":"https:\/\/www.hencolin.com\/en\/air-filter-knowledge-installation-guides-hencolin\/dop-and-pao-testing-guide-for-hepa-ulpa-filters\/","title":{"rendered":"Learn more about DOP and PAO testing: the core technology of air filter performance testing"},"content":{"rendered":"\n<p>With the increasing global requirements for air quality standards and clean environments, DOP (Dioctyl Phthalate) and PAO (Polyalphaolefin) testing have become two key methods for performance testing of high-performance air filters (HEPA and ULPA). These inspections play an integral role in ensuring cleanroom environments in industries such as pharmaceutical, electronics manufacturing, and medical. This article will introduce you to the principles, applications, and importance of these two detection methods in industry and commerce.<\/p>\n\n\n\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_85 ez-toc-wrap-left counter-hierarchy ez-toc-counter ez-toc-transparent ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">\u5927\u7db1<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/www.hencolin.com\/en\/air-filter-knowledge-installation-guides-hencolin\/dop-and-pao-testing-guide-for-hepa-ulpa-filters\/#What_are_DOP_and_PAO_tests\" >What are DOP and PAO tests?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.hencolin.com\/en\/air-filter-knowledge-installation-guides-hencolin\/dop-and-pao-testing-guide-for-hepa-ulpa-filters\/#DOP_testing_a_traditional_but_effective_method\" >DOP testing: a traditional but effective method<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.hencolin.com\/en\/air-filter-knowledge-installation-guides-hencolin\/dop-and-pao-testing-guide-for-hepa-ulpa-filters\/#PAO_Testing_A_Modern_Alternative_to_Safer\" >PAO Testing: A Modern Alternative to Safer<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.hencolin.com\/en\/air-filter-knowledge-installation-guides-hencolin\/dop-and-pao-testing-guide-for-hepa-ulpa-filters\/#Advantages_of_our_testing_equipment\" >Advantages of our testing equipment<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/www.hencolin.com\/en\/air-filter-knowledge-installation-guides-hencolin\/dop-and-pao-testing-guide-for-hepa-ulpa-filters\/#Why_choose_our_testing_services\" >Why choose our testing services?<\/a><\/li><\/ul><\/nav><\/div>\n<h4 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"What_are_DOP_and_PAO_tests\"><\/span>What are DOP and PAO tests?<span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<p><strong>Both DOP testing<\/strong> and <strong>PAO testing<\/strong> essentially use specific aerosols to test the efficiency of high-performance air filters. The core principle of both methods is to challenge the filter by generating aerosols of a specific concentration and particle size (0.3 microns is considered the most difficult particle size) and then measure the amount of aerosols before and after the filter to determine the filtration efficiency of the filter.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"DOP_testing_a_traditional_but_effective_method\"><\/span>DOP testing: a traditional but effective method<span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<p><strong>The DOP test<\/strong> is performed using an oily aerosol called dioctyl phthalate. This method has long been used in the nuclear and pharmaceutical industries because of its ability to accurately measure the removal efficiency of high-performance air filters.<\/p>\n\n\n\n<ul>\n<li>How <strong>it works<\/strong>: During DOP detection, the instrument generates a certain concentration of DOP particles and uses a photometer to detect the difference in aerosol concentration before and after the filter. This method is especially tested for particles with a particle size of 0.3 microns, as this is the most difficult particle size to be filtered by air filters.<\/li>\n\n\n\n<li><strong>Advantages and Challenges<\/strong>: DOP assays have been widely used and accepted, with results with a high degree of accuracy and reliability. However, as DOP is a potential carcinogen, it needs to be strictly controlled in use and ensure that the operating environment has a good ventilation system.<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"PAO_Testing_A_Modern_Alternative_to_Safer\"><\/span>PAO Testing: A Modern Alternative to Safer<span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<p>With the improvement of safety standards, <strong>PAO testing<\/strong> is gradually replacing DOP as the mainstream method. PAO (poly \u03b1-olefin) is a synthetic oil with strong particle stability, harmless to humans, and is widely used in applications that require highly clean air environments, such as electronics manufacturing and pharmaceutical industries.<\/p>\n\n\n\n<ul>\n<li><strong>How it works<\/strong>: PAO detection works similarly to DOP and uses a light scattering photometer to detect aerosol concentration differences. PAO aerosols have higher stability and uniformity, providing more accurate and reliable test results. During the test, PAO particles are evenly distributed in the air stream, and the filtration efficiency is evaluated by decreasing the concentration of particulates after the filter.<\/li>\n\n\n\n<li><strong>Advantages and Challenges<\/strong>: The main advantage of AO is its increased safety and test stability. Compared with DOP, PAO is non-volatile and does not pose a carcinogenic risk, and has less health impact on workers and the environment during use. However, the cost of instruments and materials for PAO testing can be higher.<\/li>\n<\/ul>\n\n\n\n<figure class=\"wp-block-gallery has-nested-images columns-default is-cropped wp-block-gallery-1 is-layout-flex wp-block-gallery-is-layout-flex\">\n<figure class=\"wp-block-image size-large\"><a href=\"https:\/\/i0.wp.com\/www.hencolin.com\/wp-content\/uploads\/2024\/09\/2P5A6567-1024x576.jpg?ssl=1\"><img fetchpriority=\"high\" decoding=\"async\" width=\"1024\" height=\"576\" data-id=\"12595\" src=\"https:\/\/i0.wp.com\/www.hencolin.com\/wp-content\/uploads\/2024\/09\/2P5A6567.jpg?resize=1024%2C576&#038;ssl=1\" alt=\"\" class=\"wp-image-12595\" srcset=\"https:\/\/i0.wp.com\/www.hencolin.com\/wp-content\/uploads\/2024\/09\/2P5A6567.jpg?resize=1024%2C576&amp;ssl=1 1024w, https:\/\/i0.wp.com\/www.hencolin.com\/wp-content\/uploads\/2024\/09\/2P5A6567.jpg?resize=300%2C169&amp;ssl=1 300w, https:\/\/i0.wp.com\/www.hencolin.com\/wp-content\/uploads\/2024\/09\/2P5A6567.jpg?resize=768%2C432&amp;ssl=1 768w, https:\/\/i0.wp.com\/www.hencolin.com\/wp-content\/uploads\/2024\/09\/2P5A6567.jpg?resize=600%2C337&amp;ssl=1 600w, https:\/\/i0.wp.com\/www.hencolin.com\/wp-content\/uploads\/2024\/09\/2P5A6567.jpg?w=1417&amp;ssl=1 1417w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" data-recalc-dims=\"1\" \/><\/a><\/figure>\n<\/figure>\n\n\n\n<h4 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Advantages_of_our_testing_equipment\"><\/span>Advantages of our testing equipment<span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<p>In our company, we are equipped with DOP and PAO testing instruments, which can provide accurate and fast high-performance air filter testing services. Our instruments produce stable aerosol particles, and together with precision light scattering photometers, ensure that every test result meets or exceeds international standards such as ISO 14644-3 and EN 1822.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Why_choose_our_testing_services\"><\/span>Why choose our testing services?<span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<ul>\n<li><strong>Comprehensive solutions<\/strong>: Whether it&#8217;s DOP or PAO testing, we have the right solution for your needs. From instrument selection and installation to regular calibration and maintenance, we provide professional support every step of the way.<\/li>\n\n\n\n<li><strong>Safe and reliable operation<\/strong>: Our team strictly adheres to safe operating practices and employs instruments and materials that meet international standards to ensure the accuracy and reliability of every test.<\/li>\n\n\n\n<li><strong>Experienced and professional team<\/strong>: Our technicians have extensive industry experience and expertise to quickly and effectively solve any problem in the inspection process.<\/li>\n<\/ul>\n\n\n\n<figure class=\"wp-block-image size-large\"><a href=\"https:\/\/i0.wp.com\/www.hencolin.com\/wp-content\/uploads\/2024\/09\/2P5A6596-1-1024x633.jpg?ssl=1\"><img decoding=\"async\" width=\"1024\" height=\"633\" src=\"https:\/\/i0.wp.com\/www.hencolin.com\/wp-content\/uploads\/2024\/09\/2P5A6596-1.jpg?resize=1024%2C633&#038;ssl=1\" alt=\"\" class=\"wp-image-12601\" srcset=\"https:\/\/i0.wp.com\/www.hencolin.com\/wp-content\/uploads\/2024\/09\/2P5A6596-1.jpg?resize=1024%2C633&amp;ssl=1 1024w, https:\/\/i0.wp.com\/www.hencolin.com\/wp-content\/uploads\/2024\/09\/2P5A6596-1.jpg?resize=300%2C185&amp;ssl=1 300w, https:\/\/i0.wp.com\/www.hencolin.com\/wp-content\/uploads\/2024\/09\/2P5A6596-1.jpg?resize=768%2C475&amp;ssl=1 768w, https:\/\/i0.wp.com\/www.hencolin.com\/wp-content\/uploads\/2024\/09\/2P5A6596-1.jpg?resize=600%2C371&amp;ssl=1 600w, https:\/\/i0.wp.com\/www.hencolin.com\/wp-content\/uploads\/2024\/09\/2P5A6596-1.jpg?w=1493&amp;ssl=1 1493w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" data-recalc-dims=\"1\" \/><\/a><\/figure>\n\n\n\n<p>DOP and PAO testing plays a very important role in air filter performance testing. We are committed to providing our customers with the highest standards of testing services to ensure that your production environment meets the latest air quality and safety standards. When you choose our high-efficiency HEPA products, you get a testing service to keep your air filter performing at its best.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>With the increasing global requirements for air quality standards and clean environments, DOP (Dioctyl Phthalate) and PAO (Polyalphaolefin) testing have become two key methods for performance testing of high-performance air filters (HEPA and ULPA). These inspections play an integral role in ensuring cleanroom environments in industries such as pharmaceutical, electronics manufacturing, and medical. This article [&hellip;]<\/p>\n","protected":false},"author":9,"featured_media":12604,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_jetpack_memberships_contains_paid_content":false},"categories":[141,381,26],"tags":[],"blocksy_meta":[],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v22.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Learn more about DOP and PAO testing: the core technology of air filter performance testing - Hencolin International |Industrial Air Filter Manufacturer<\/title>\n<meta name=\"description\" content=\"Learn how DOP and PAO testing verify HEPA and ULPA filter performance using aerosol challenge tests, photometers, ISO 14644-3 and EN 1822 standards.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.hencolin.com\/en\/air-filter-knowledge-installation-guides-hencolin\/dop-and-pao-testing-guide-for-hepa-ulpa-filters\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Learn more about DOP and PAO testing: the core technology of air filter performance testing - Hencolin International |Industrial Air Filter Manufacturer\" \/>\n<meta property=\"og:description\" content=\"Learn how DOP and PAO testing verify HEPA and ULPA filter performance using aerosol challenge tests, photometers, ISO 14644-3 and EN 1822 standards.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.hencolin.com\/en\/air-filter-knowledge-installation-guides-hencolin\/dop-and-pao-testing-guide-for-hepa-ulpa-filters\/\" \/>\n<meta property=\"og:site_name\" content=\"Hencolin International\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/hencolin.1990\/\" \/>\n<meta property=\"article:published_time\" content=\"2024-09-13T02:29:10+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2026-07-09T08:18:27+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.hencolin.com\/wp-content\/uploads\/2024\/09\/2P5A6576.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1417\" \/>\n\t<meta property=\"og:image:height\" content=\"797\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"yousyuan\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"yousyuan\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"3 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/www.hencolin.com\/en\/air-filter-knowledge-installation-guides-hencolin\/dop-and-pao-testing-guide-for-hepa-ulpa-filters\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/www.hencolin.com\/en\/air-filter-knowledge-installation-guides-hencolin\/dop-and-pao-testing-guide-for-hepa-ulpa-filters\/\"},\"author\":{\"name\":\"yousyuan\",\"@id\":\"https:\/\/www.hencolin.com\/en\/#\/schema\/person\/f2a822d2be40c1afccfc150c3d0e5e0e\"},\"headline\":\"Learn more about DOP and PAO testing: the core technology of air filter performance testing\",\"datePublished\":\"2024-09-13T02:29:10+00:00\",\"dateModified\":\"2026-07-09T08:18:27+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/www.hencolin.com\/en\/air-filter-knowledge-installation-guides-hencolin\/dop-and-pao-testing-guide-for-hepa-ulpa-filters\/\"},\"wordCount\":694,\"commentCount\":0,\"publisher\":{\"@id\":\"https:\/\/www.hencolin.com\/en\/#organization\"},\"articleSection\":[\"Air Filter Articles In Focus\",\"Air Filter Knowledge\",\"\u6ffe\u7db2\u77e5\u8b58\"],\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\/\/www.hencolin.com\/en\/air-filter-knowledge-installation-guides-hencolin\/dop-and-pao-testing-guide-for-hepa-ulpa-filters\/#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.hencolin.com\/en\/air-filter-knowledge-installation-guides-hencolin\/dop-and-pao-testing-guide-for-hepa-ulpa-filters\/\",\"url\":\"https:\/\/www.hencolin.com\/en\/air-filter-knowledge-installation-guides-hencolin\/dop-and-pao-testing-guide-for-hepa-ulpa-filters\/\",\"name\":\"Learn more about DOP and PAO testing: the core technology of air filter performance testing - 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