{"id":24062,"date":"2021-09-16T08:24:04","date_gmt":"2021-09-16T06:24:04","guid":{"rendered":"https:\/\/nh-oring.de\/decompression-o-ring-lexicon\/"},"modified":"2025-05-07T12:25:12","modified_gmt":"2025-05-07T10:25:12","slug":"decompression-o-ring-lexicon","status":"publish","type":"page","link":"https:\/\/nh-oring.de\/en\/decompression-o-ring-lexicon\/","title":{"rendered":"Decompression | O-Ring Lexicon"},"content":{"rendered":"\t\t
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Decompression<\/h1>\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
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#1<\/span> What is decompression?<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Explosive decompression occurs when the pressure in a system drops suddenly and the gas in an O-ring wants to escape faster than the gas permeability of the O-ring allows.<\/p>

In principle, every O-ring is permeable to gases or liquids to a certain degree (technical term: permeability). How high the permeability is depends on the composition of the O-ring material.<\/p>

Low gas permeability:<\/strong> NBR, FKM and FFKM<\/p>

High gas permeability:<\/strong> SILICON<\/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

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#2<\/span> How does decompression occur?<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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1. Initial situation: A compressed elastic O-ring in a system with a pressure of 50 bar and a gas as medium.<\/p>

2 Due to the gas permeability, the O-ring contains compressed gas under a pressure of 50 bar.<\/p>

3. The system pressure drops abruptly from 50 bar to ambient pressure (approx. 1 bar).<\/p>

4. The gas is now still under 1 bar pressure and therefore wants to expand again.<\/p>

5. The gas in the O-ring suddenly wants to escape because there is no longer enough space.<\/p>

6. The gas permeability of the O-ring is too low, so that the gas makes its own way through the structure of the O-ring.\u00a0<\/p>

7. Cracks appear and bubbles form on the surface from which the gas escapes.<\/p>

8. The O-ring can be damaged so severely that it loses its sealing effect.<\/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

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#3<\/span> Rule of thumb for avoiding decompression<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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\n\t\t\t\n\t\t\t\t\t\t<\/span>\n\t\t<\/div>\n\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
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The higher the system pressure, the harder the O-ring must be. Ideally, the O-ring should have a Shore hardness of 90 Shore A.<\/p>\n

If it is known that the system pressure fluctuates greatly and can change abruptly, then a material mixture developed for use with decompression should also be used. These materials all have 90 Shore A and the addition “Resistant to explosive decompression” or “Approval: Norsok M710”.<\/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<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"

Decompression #1 What is decompression? Explosive decompression occurs when the pressure in a system drops suddenly and the gas in an O-ring wants to escape faster than the gas permeability of the O-ring allows. In principle, every O-ring is permeable to gases or liquids to a certain degree (technical term: permeability). How high the permeability … Read more<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-24062","page","type-page","status-publish"],"yoast_head":"\nDecompression for O-rings | The O-ring encyclopedia<\/title>\n<meta name=\"description\" content=\"What is meant by decompression in O-rings \u2705 O-ring lexicon \u2705 O-ring technical terms \u2705 Click here!\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/nh-oring.de\/en\/decompression-o-ring-lexicon\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Decompression for O-rings | The O-ring encyclopedia\" \/>\n<meta property=\"og:description\" content=\"What is meant by decompression in O-rings \u2705 O-ring lexicon \u2705 O-ring technical terms \u2705 Click here!\" \/>\n<meta property=\"og:url\" content=\"https:\/\/nh-oring.de\/en\/decompression-o-ring-lexicon\/\" \/>\n<meta property=\"og:site_name\" content=\"NH O-RING - 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