{"id":162,"date":"2026-07-13T16:46:45","date_gmt":"2026-07-13T08:46:45","guid":{"rendered":"https:\/\/themebb.com\/en\/archives\/162"},"modified":"2026-07-13T16:46:45","modified_gmt":"2026-07-13T08:46:45","slug":"compressed-air-oil-content-understand-iso-8573-1-standard-and-oil-free-cleanliness-level","status":"publish","type":"post","link":"https:\/\/themebb.com\/en\/archives\/162","title":{"rendered":"Compressed Air Oil Content: Understand ISO 8573-1 Standard and Oil-Free Cleanliness Level"},"content":{"rendered":"<h2>What is the oil content of compressed air?<\/h2>\n<p>Compressed air oil content refers to the total oil content in the form of aerosol (oil mist), liquid oil and oil vapor in compressed air, usually in mg\/ m\u00b3. It is one of the key indicators to measure the quality of compressed air, directly affecting industries with strict cleanliness requirements such as precision manufacturing, food packaging, pharmaceutical production, etc.<\/p>\n<h2>ISO 8571-1: internationally recognized cleanliness classification standard<\/h2>\n<p>ISO 8571-1 divides compressed air quality into three levels of pollutants: solid particles, water and oil. Among them, the oil content level ranges from 0 (the most strict) to 5 (the highest allowable value),<strong>level 0 represents &#8216;technically accessible oil-free&#8217;<\/strong>, not absolute zero oil, but the verified oil content &le; 0.01 mg\/ m\u00b3, and there is no oil vapor and oil mist residue.<\/p>\n<h2>How to achieve low oil\/oil-free compressed air?<\/h2>\n<ul>\n<li><strong>SOURCE control<\/strong>: use oil-free air compressor (such as scroll and screw oil-free model);<\/li>\n<li><strong>end purification<\/strong>: equipped with high-efficiency oil mist filter (such as condensed or activated carbon composite), the oil content can be reduced to less than 0.003 mg\/m\u00b3;<\/li>\n<li><strong>periodic Verification<\/strong>: conduct third-party oil content testing according to ISO 8573-1 to ensure continuous compliance with the target cleanliness level.<\/li>\n<\/ul>\n<h2>Cleanliness level selection needs to match application scenarios<\/h2>\n<p>for example, Class 1 is often required for electronic assembly (oil &le; 0.01 mg\/ m\u00b3), and general pneumatic tools may be applicable to Class 4 (oil &le; 5 mg\/ m\u00b3). Incorrect selection not only increases energy consumption and maintenance costs, but also may lead to product pollution or equipment failure.<\/p>\n<p> Class 0 <\/p>\n<p> Class 1 <\/p>\n<p> Class 3<br \/>\n oil content grade (ISO 8573-1)<br \/>\n\u2192 increasing oil content and decreasing cleanliness<\/p>\n","protected":false},"excerpt":{"rendered":"<p>The oil content of compressed air is the core parameter that affects the industrial cleanliness. This paper analyzes the classification of oil content in ISO 8571-1 standard, clarifies the actual meaning of Class 0 oil-free standard, and introduces the key role of oil mist filter in achieving compliance cleanliness.<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","zob_sync_key":"zsync_a20d4f951bc7f8ae5e40ca07","zob_sync_source_post_type":"post","zob_sync_lang":"en-US","zob_sync_source_url":"https:\/\/themebb.com\/blog\/archives\/231.html","zob_sync_key_version":"v1","zob_sync_source_blog_id":"1","zob_sync_source_post_id":"231"},"categories":[23],"tags":[],"class_list":["post-162","post","type-post","status-publish","format-standard","hentry","category-haha"],"_links":{"self":[{"href":"https:\/\/themebb.com\/en\/wp-json\/wp\/v2\/posts\/162","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/themebb.com\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/themebb.com\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/themebb.com\/en\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/themebb.com\/en\/wp-json\/wp\/v2\/comments?post=162"}],"version-history":[{"count":0,"href":"https:\/\/themebb.com\/en\/wp-json\/wp\/v2\/posts\/162\/revisions"}],"wp:attachment":[{"href":"https:\/\/themebb.com\/en\/wp-json\/wp\/v2\/media?parent=162"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/themebb.com\/en\/wp-json\/wp\/v2\/categories?post=162"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/themebb.com\/en\/wp-json\/wp\/v2\/tags?post=162"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}