{"id":233,"date":"2018-01-11T09:51:30","date_gmt":"2018-01-11T09:51:30","guid":{"rendered":"https:\/\/www.orslabs.fr\/?page_id=233"},"modified":"2025-06-22T11:52:35","modified_gmt":"2025-06-22T09:52:35","slug":"gas-evolution-in-leaking-package","status":"publish","type":"page","link":"https:\/\/www.orslabs.fr\/en\/tools\/gas-evolution-in-leaking-package\/","title":{"rendered":"Gas Evolution in Leaking Package"},"content":{"rendered":"\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-fi4rt-9dae9309b56be7d51ecd416069dc37cf\">\n.flex_column.av-fi4rt-9dae9309b56be7d51ecd416069dc37cf{\nborder-radius:0px 0px 0px 0px;\npadding:0px 0px 0px 0px;\n}\n<\/style>\n<div  class='flex_column av-fi4rt-9dae9309b56be7d51ecd416069dc37cf av_one_full  avia-builder-el-0  el_before_av_textblock  avia-builder-el-first  first flex_column_div av-zero-column-padding  '     ><style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-kkmy19fy-35ca873dff4b6845be88f0ab69aec8fe\">\n#top .av-special-heading.av-kkmy19fy-35ca873dff4b6845be88f0ab69aec8fe{\npadding-bottom:10px;\n}\nbody .av-special-heading.av-kkmy19fy-35ca873dff4b6845be88f0ab69aec8fe .av-special-heading-tag .heading-char{\nfont-size:25px;\n}\n.av-special-heading.av-kkmy19fy-35ca873dff4b6845be88f0ab69aec8fe .av-subheading{\nfont-size:15px;\n}\n<\/style>\n<div  class='av-special-heading av-kkmy19fy-35ca873dff4b6845be88f0ab69aec8fe av-special-heading-h1 blockquote modern-quote modern-centered  avia-builder-el-1  avia-builder-el-no-sibling  av-linked-heading'><h1 class='av-special-heading-tag'  itemprop=\"headline\"  >Gas Evolution in Leaking Package<\/h1><div class=\"special-heading-border\"><div class=\"special-heading-inner-border\"><\/div><\/div><\/div><\/div><section  class='av_textblock_section av-jn619oj4-d36442229a53b43e8e00e674989a7e21 '   itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/CreativeWork\" ><div class='avia_textblock'  itemprop=\"text\" ><div>\n<p>Very often, we try to explain the Gas Analysis results with gas exchanges, but the math computations are not intuitive. Our online tool is meant to visualize the gas content of a sealed package, taking into account a leak with the exterior atmosphere.<\/p>\n<p><strong>The equations currently used in this tool are based on the Molecular Conductance of Gases<\/strong> for a Long Cylindrical Leak Path of Uniform Cross-Section. This is a first approach computation, with limitations, especially for large leak rates.<\/p>\n<\/div>\n<div>\n<h2>Graph display options<\/h2>\n<ul>\n<li>The graph displays the various gases concentrations or partial pressures as a function of time. Each gas corresponds to a color. Total pressure is displayed in Black.<\/li>\n<li>Y scale can display either concentrations (Total always 100%, as in Gas Analyses) or partial pressures (in atmosphere). Toggle display mode with \u201cPartial Pressure\/Concentration\u201d button.<\/li>\n<li>ATTENTION : make sure to be in \u201cconcentration\u201d mode when you enter the individual gas values in the form.<\/li>\n<li>Y scale can be linear or LOG. Toggle display mode with \u201cGraph Scale\u201d button<\/li>\n<\/ul>\n<h2>Information you can change<\/h2>\n<ul>\n<li>Package characteristics (cavity volume in cc, total air leak rate in atm\u00b7cc\/s)<\/li>\n<li>1st line : Sealing conditions (temperature in \u00b0C, total pressure, gas content as ppm). REMINDER : There is an amount of Moisture at sealing time, which can be determined by gas analysis. Depending on package type, presence of polymerics, pre-seal bakes, and who knows what else, time zero internal moisture can be a lot higher than expected. Performing gas analysis on representative sample packages as soon as possible after seal gives a &#8220;time zero&#8221; moisture concentration to start modeling calculations.<\/li>\n<li>Other lines : Successive outside gaseous environments which the package will see. (temperature in \u00b0C, total pressure, gas content as ppm)<\/li>\n<li>Steps of outside environment can be added or removed. \u201c-\u201c removes the current line ; \u201c+\u201d adds a step after the current line.<\/li>\n<li>ATTENTION : For a step to be taken into account, you need to specify the Duration, a total pressure (default is 1 atm) and gas concentrations which sum up to 1 000 000 ppm<\/li>\n<\/ul>\n<h2>Hints on form input<\/h2>\n<ul>\n<li>When entering a value, validate with the Enter key or change cell with the Tab key.<\/li>\n<li>Durations are presented in days + hours. For example, you can type 1.5 in the \u201cday\u201d column or 36 in the \u201chours\u201d column, and you will get \u201c1d 12h\u201d.<\/li>\n<li>Gas concentrations are displayed in ppm (10 000 ppm = 1%). You can input values in ppm directly (i.e. 15000) or type them as % with the \u201c%\u201d character at the end (i.e. 1.5%).<\/li>\n<li>Balance gas : The computation of the remaining concentration can be automated. Just enter an empty value in a gas cell and the complement to 100% will be computed. For example, for dry air, you can enter \u201c20.95%\u201d as Oxygen concentration, \u201c9340\u201d as Argon concentration, and \u201c\u201d as Nitrogen concentration. The display will change to 781160 ppm.<\/li>\n<li>Adding a gas to an existing gas mix (i.e. adding moisture to dry air) : You can prefix the gas concentration with a \u201c+\u201d sign, and the gas will be added to the current mixture. For example, if you entered dry air concentrations (781160 Nitrogen, 20950 Oxygen and 9340 Argon) and you type \u201c+1%\u201d for moisture, the end results will be 773348 Nitrogen, 207405 Oxygen, 9247 Argon (subtotal 99%), and 10000 Moisture (Known bugg : You might need to re-type the moisture value).<\/li>\n<li>To convert from Relative Humidity to ppmv of Moisture, you can use our conversion page.<\/li>\n<li>Temperature indication is used to correct partial pressures based on perfect gas equation (Pression \u00b7 Volume \/ TemperatureKelvin = Constant). This effect is visible when looking at partial pressures. For example, using a sealing temperature of 100\u00b0C and then a temperature of 25\u00b0C will drop the total pressure from 1 atm to 0.8 atm.<\/li>\n<li>Partial pressure table is available at the bottom of the page. Each outside environment is split in a number of computation steps. This is the raw data used for the graph.<\/li>\n<li>Leak rate : When you change the value of the air leak rate, it gets copied to he steps below. You can also modify the leak rate of an intermediate step (i.e. to simulate the degradation of the package hermeticity).<\/li>\n<\/ul>\n<\/div>\n<div><\/div>\n<div><a href=\"https:\/\/www.orslabs.fr\/pdf\/ors-tool-gas-evolution-in-leaking-package.pdf\">Here are some instructions about this tool, in pdf format.<\/a><\/div>\n<div>We appreciate your feedback about this tool (<a href=\"mailto:info@orslabs.fr\">info@orslabs.fr<\/a>).<\/div>\n<div id=\"sconnect-is-installed\" style=\"display: none;\">2.5.0.0<\/div>\n<div id=\"sconnect-is-installed\" style=\"display: none;\">2.5.0.0<\/div>\n<div id=\"sconnect-is-installed\" style=\"display: none;\">2.5.0.0<\/div>\n<\/div><\/section><\/p>\n\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-vg4h-261e30d83a0e89c8bc527f1dabf427d1\">\n.flex_column.av-vg4h-261e30d83a0e89c8bc527f1dabf427d1{\nborder-radius:0px 0px 0px 0px;\npadding:0px 0px 0px 0px;\n}\n<\/style>\n<div  class='flex_column av-vg4h-261e30d83a0e89c8bc527f1dabf427d1 av_one_full  avia-builder-el-3  el_after_av_textblock  avia-builder-el-last  first flex_column_div av-zero-column-padding  column-top-margin'     ><section  class='av_textblock_section av-9vnf5-5766766b41f680d30bbd8fd9a2cb89a3 '   itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/CreativeWork\" ><div class='avia_textblock'  itemprop=\"text\" ><script type=\"text\/javascript\">\/\/ <![CDATA[\njQuery(document).ready(function(){\n\tsetInterval( function() { AutoiFrameAdjustiFrameHeight( 'Gas Evolution in Leaking Package', 50); }, 1000 );\n});\n\/\/ ]]><\/script>\n<iframe loading=\"lazy\" id=\"Gas Evolution in Leaking Package\" name=\"Gas Evolution in Leaking Package\" src=\"\/ors-tools\/gas-evolution-in-leaking-package.html\" width=\"100%\" height=\"auto\" frameborder=\"0\" scrolling=\"no\"onload=\"AutoiFrameAdjustiFrameHeight('Gas Evolution in Leaking Package',50);\"><\/iframe>\n<\/div><\/section><\/div>\n","protected":false},"excerpt":{"rendered":"","protected":false},"author":13,"featured_media":0,"parent":218,"menu_order":5,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"class_list":["post-233","page","type-page","status-publish","hentry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.9 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>ORS Gas Evolution in Leaking Package |Oneida Research Services<\/title>\n<meta name=\"description\" content=\"The ORS gas evolution in leaking packages is a tool used to visualize the gas content of a sealed package.\" \/>\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.orslabs.fr\/en\/tools\/gas-evolution-in-leaking-package\/\" \/>\n<meta property=\"og:locale\" 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