{"id":8840,"date":"2026-07-21T00:19:37","date_gmt":"2026-07-20T16:19:37","guid":{"rendered":"https:\/\/topsilsilicone.com\/?p=8840"},"modified":"2026-07-21T18:07:58","modified_gmt":"2026-07-21T10:07:58","slug":"how-to-degas-platinum-silicone-at-scale-equipment-cycle-guide","status":"publish","type":"post","link":"https:\/\/topsilsilicone.com\/ar\/how-to-degas-platinum-silicone-at-scale-equipment-cycle-guide\/","title":{"rendered":"How to Degas Platinum Silicone at Scale: Equipment &amp; Cycle Guide"},"content":{"rendered":"<p class=\"wp-block-paragraph\">A vacuum process that works for a 2 kg laboratory batch can fail completely when the same platinum silicone is mixed in a 30 kg production batch.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The material may overflow before the target pressure is reached. Pump-down may consume too much of the working time. The chamber may remove most of the air, only for bubbles to be reintroduced during transfer and pouring.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">At scale, the solution is rarely \u201cuse a stronger pump\u201d or \u201capply a deeper vacuum.\u201d<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Successful production requires the silicone, container, vacuum chamber, pump, pressure profile and transfer method to work as one system.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>The objective is not the deepest vacuum. It is a repeatable cycle that achieves the required bubble quality without excessive overflow, material loss, operator intervention or loss of working time.<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This guide is intended for mold factories, PU casting workshops, rapid prototyping companies and industrial users moving from small-batch degassing to repeatable production.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<div class=\"wp-block-group snippet-answer-box is-vertical is-layout-flex wp-container-core-group-is-layout-4fc3f8e1 wp-block-group-is-layout-flex\">\n<h3 class=\"wp-block-heading snippet-answer-title has-luminous-vivid-orange-color has-text-color has-link-color wp-elements-11200c0ab3570c3912151c7bf0eaa25d\"><strong>Quick Answer: How Should Platinum Silicone Be Degassed at Scale?<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Efficient <a href=\"https:\/\/topsilsilicone.com\/ar\/%d8%aa%d9%81%d8%b1%d9%8a%d8%ba-%d8%a7%d9%84%d8%b3%d9%8a%d9%84%d9%8a%d9%83%d9%88%d9%86-%d9%85%d9%86-%d8%a7%d9%84%d8%b3%d9%8a%d9%84%d9%8a%d9%83%d9%88%d9%86-%d9%83%d9%8a%d9%81%d9%8a%d8%a9-%d8%a5%d8%ae\/\" data-type=\"post\" data-id=\"4060\">platinum silicone degassing<\/a> at scale requires a validated bubble-acceptance standard, sufficient container headspace, a vacuum chamber sized for temporary foam expansion, a pump selected by effective pumping speed, an absolute-pressure gauge and a controlled vacuum profile that fits within the silicone\u2019s working time.<\/strong><\/p>\n<\/div>\n\n\n\n<p class=\"wp-block-paragraph\">The process should be controlled by:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Batch mass<\/li>\n\n\n\n<li>Mixed viscosity<\/li>\n\n\n\n<li>Material temperature<\/li>\n\n\n\n<li>Maximum foam rise<\/li>\n\n\n\n<li>Pump-down time<\/li>\n\n\n\n<li>Absolute pressure<\/li>\n\n\n\n<li>Foam-collapse behavior<\/li>\n\n\n\n<li>Transfer method<\/li>\n\n\n\n<li>Final defect rate<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">A fixed instruction such as \u201cdegas for three minutes\u201d is not enough for reliable industrial production.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Production settings should preferably be recorded as absolute pressure in vacuum technology, such as mbar<a href=\"https:\/\/www.leybold.com\/en\/knowledge\/vacuum-fundamentals\/fundamental-physics-of-vacuum\/units-and-ranges-of-pressure\" target=\"_blank\" rel=\"noopener\"> absolute or kPa<\/a> absolute, rather than only as a percentage vacuum reading.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Six Questions to Ask Before Scaling Up<\/h2>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" src=\"data:image\/gif;base64,R0lGODlhAQABAIAAAAAAAP\/\/\/yH5BAEAAAAALAAAAAABAAEAAAIBRAA7\" data-src=\"http:\/\/topsilsilicone.com\/wp-content\/uploads\/six-question-silicone-degassing-scale-up-check.webp\" alt=\"six-question-silicone-degassing-scale-up-check\" class=\"wp-image-8845 lazyload\"\/><noscript><img fetchpriority=\"high\" decoding=\"async\" width=\"1000\" height=\"622\" src=\"http:\/\/topsilsilicone.com\/wp-content\/uploads\/six-question-silicone-degassing-scale-up-check.webp\" alt=\"six-question-silicone-degassing-scale-up-check\" class=\"wp-image-8845 lazyload\" srcset=\"https:\/\/topsilsilicone.com\/wp-content\/uploads\/six-question-silicone-degassing-scale-up-check.webp 1000w, https:\/\/topsilsilicone.com\/wp-content\/uploads\/six-question-silicone-degassing-scale-up-check-300x187.webp 300w, https:\/\/topsilsilicone.com\/wp-content\/uploads\/six-question-silicone-degassing-scale-up-check-768x478.webp 768w, https:\/\/topsilsilicone.com\/wp-content\/uploads\/six-question-silicone-degassing-scale-up-check-18x12.webp 18w, https:\/\/topsilsilicone.com\/wp-content\/uploads\/six-question-silicone-degassing-scale-up-check-600x373.webp 600w\" sizes=\"(max-width: 1000px) 100vw, 1000px\" \/><\/noscript><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Before buying a larger chamber or pump, answer these six questions:<\/p>\n\n\n\n<ol start=\"1\" class=\"wp-block-list\">\n<li><strong>How much usable working time remains after mixing?<\/strong><\/li>\n\n\n\n<li><strong>How long does the complete system take to reach the validated pressure?<\/strong><\/li>\n\n\n\n<li><strong>How high does the silicone foam rise at the maximum batch size?<\/strong><\/li>\n\n\n\n<li><strong>Can transfer or pouring reintroduce air after degassing?<\/strong><\/li>\n\n\n\n<li><strong>Can operators repeat the same temperature, pressure and timing window?<\/strong><\/li>\n\n\n\n<li><strong>What defect level defines an acceptable finished mold?<\/strong><\/li>\n<\/ol>\n\n\n\n<p class=\"wp-block-paragraph\">If these questions cannot be answered, the process is not yet ready for scale production.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Define the Bubble-Acceptance Standard First<\/strong><strong><\/strong><\/h2>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" src=\"data:image\/gif;base64,R0lGODlhAQABAIAAAAAAAP\/\/\/yH5BAEAAAAALAAAAAABAAEAAAIBRAA7\" data-src=\"http:\/\/topsilsilicone.com\/wp-content\/uploads\/silicone-degassing-acceptance-criteria-by-application.webp\" alt=\"silicone-degassing-acceptance-criteria-by-application\" class=\"wp-image-8846 lazyload\"\/><noscript><img decoding=\"async\" width=\"1000\" height=\"671\" src=\"http:\/\/topsilsilicone.com\/wp-content\/uploads\/silicone-degassing-acceptance-criteria-by-application.webp\" alt=\"silicone-degassing-acceptance-criteria-by-application\" class=\"wp-image-8846 lazyload\" srcset=\"https:\/\/topsilsilicone.com\/wp-content\/uploads\/silicone-degassing-acceptance-criteria-by-application.webp 1000w, https:\/\/topsilsilicone.com\/wp-content\/uploads\/silicone-degassing-acceptance-criteria-by-application-300x201.webp 300w, https:\/\/topsilsilicone.com\/wp-content\/uploads\/silicone-degassing-acceptance-criteria-by-application-768x515.webp 768w, https:\/\/topsilsilicone.com\/wp-content\/uploads\/silicone-degassing-acceptance-criteria-by-application-18x12.webp 18w, https:\/\/topsilsilicone.com\/wp-content\/uploads\/silicone-degassing-acceptance-criteria-by-application-600x403.webp 600w\" sizes=\"(max-width: 1000px) 100vw, 1000px\" \/><\/noscript><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\u201cBubble-free\u201d is not a precise industrial specification.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Different mold applications tolerate different levels and locations of air.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td><strong>\u0627\u0644\u062a\u0637\u0628\u064a\u0642<\/strong><strong><\/strong><\/td><td><strong>Possible Acceptance Check<\/strong><strong><\/strong><\/td><\/tr><tr><td>\u0635\u0646\u0639 \u0627\u0644\u0642\u0648\u0627\u0644\u0628 \u0627\u0644\u0639\u0627\u0645\u0629<\/td><td>No visible voids in critical surface areas<\/td><\/tr><tr><td>High-detail mold<\/td><td>No pinholes on engraving, texture or fine features<\/td><\/tr><tr><td>Transparent cut mold<\/td><td>No bubbles obstructing cutting lines or master visibility<\/td><\/tr><tr><td>PU prototype mold<\/td><td>No voids causing dimensional or surface rejection<\/td><\/tr><tr><td>Thin-wall mold<\/td><td>No bubble clusters reducing local strength<\/td><\/tr><tr><td>Repeat industrial mold<\/td><td>Stable defect rate across multiple batches<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">A clear surface does not prove that the full silicone mass is free from bubbles. Depending on the application, validation may include:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Cured test coupons<\/li>\n\n\n\n<li>Cross-section inspection<\/li>\n\n\n\n<li>Transparent-cup observation<\/li>\n\n\n\n<li>Mold-surface inspection<\/li>\n\n\n\n<li>Casting defect rate<\/li>\n\n\n\n<li>Dimensional checks<\/li>\n\n\n\n<li>Comparison of mixed and cured density<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Production settings should be approved against the final mold requirement\u2014not only what the silicone looks like inside the chamber.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Not All Bubbles Have the Same Cause<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Vacuum degassing mainly removes <strong>entrained air<\/strong> introduced during mixing and handling.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Entrained air commonly comes from:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>High-speed mixing<\/li>\n\n\n\n<li>Aggressive scraping<\/li>\n\n\n\n<li>Splashing<\/li>\n\n\n\n<li>Pumping<\/li>\n\n\n\n<li>Long pouring drops<\/li>\n\n\n\n<li>Poor filling paths<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Other bubbles may be related to:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Moisture<\/li>\n\n\n\n<li>Volatile contamination<\/li>\n\n\n\n<li>Reactions with the master or casting material<\/li>\n\n\n\n<li>Material deterioration<\/li>\n\n\n\n<li>Incorrect A\/B mixing<\/li>\n\n\n\n<li>Cure inhibition<\/li>\n<\/ul>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\"><strong>Applying a deeper vacuum will not correct incomplete mixing, moisture reactions or cure inhibition.<\/strong><\/p>\n<\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\">The first troubleshooting step is therefore to identify whether the defect is trapped air, reintroduced air or a chemical\/process problem.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The simplified equation provides only a preliminary estimate of <a href=\"https:\/\/www.leybold.com\/en\/knowledge\/vacuum-fundamentals\/vacuum-generation\/calculating-pump-down-time\" target=\"_blank\" rel=\"noopener\">vacuum chamber pump-down time<\/a> and must be verified using the real chamber, piping and silicone batch.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Why Laboratory Degassing Often Fails at Production Scale<\/h2>\n\n\n\n<ol start=\"1\" class=\"wp-block-list\">\n<li>Foam volume grows beyond the available space<\/li>\n<\/ol>\n\n\n\n<p class=\"wp-block-paragraph\">A larger batch produces a higher liquid level and may leave too little vertical clearance. The silicone can overflow before reaching the operating pressure.<\/p>\n\n\n\n<ol start=\"2\" class=\"wp-block-list\">\n<li>Pump-down consumes the processing window<\/li>\n<\/ol>\n\n\n\n<ol start=\"3\" class=\"wp-block-list\">\n<li>Batch temperature changes<\/li>\n<\/ol>\n\n\n\n<p class=\"wp-block-paragraph\">Larger batches may receive more mixing energy and remain warmer. This can reduce viscosity but may also accelerate cure.<\/p>\n\n\n\n<ol start=\"4\" class=\"wp-block-list\">\n<li>Air is reintroduced after degassing<\/li>\n<\/ol>\n\n\n\n<p class=\"wp-block-paragraph\">High pouring drops, splashing, narrow fittings or aggressive pumping can undo the work completed in the chamber.<\/p>\n\n\n\n<ol start=\"5\" class=\"wp-block-list\">\n<li>The vacuum line limits the pump<\/li>\n<\/ol>\n\n\n\n<p class=\"wp-block-paragraph\">A pump with high nominal capacity may perform poorly when connected through a narrow hose, long pipe, restrictive filter or undersized valve.<\/p>\n\n\n\n<ol start=\"6\" class=\"wp-block-list\">\n<li>Operators follow time instead of measurable conditions<\/li>\n<\/ol>\n\n\n\n<p class=\"wp-block-paragraph\">A fixed three-minute cycle may work for one batch and fail when viscosity, temperature, batch mass or pump condition changes.<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\"><strong>Laboratory degassing is often time-based. Industrial degassing must be condition-based and repeatable.<\/strong><\/p>\n<\/blockquote>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Match the Silicone, Container, Chamber and Pump<\/strong><strong><\/strong><\/h2>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" src=\"data:image\/gif;base64,R0lGODlhAQABAIAAAAAAAP\/\/\/yH5BAEAAAAALAAAAAABAAEAAAIBRAA7\" data-src=\"http:\/\/topsilsilicone.com\/wp-content\/uploads\/production-scale-silicone-degassing-equipment-setup.webp\" alt=\"production-scale-silicone-degassing-equipment-setup\" class=\"wp-image-8847 lazyload\"\/><noscript><img decoding=\"async\" width=\"1000\" height=\"576\" src=\"http:\/\/topsilsilicone.com\/wp-content\/uploads\/production-scale-silicone-degassing-equipment-setup.webp\" alt=\"production-scale-silicone-degassing-equipment-setup\" class=\"wp-image-8847 lazyload\" srcset=\"https:\/\/topsilsilicone.com\/wp-content\/uploads\/production-scale-silicone-degassing-equipment-setup.webp 1000w, https:\/\/topsilsilicone.com\/wp-content\/uploads\/production-scale-silicone-degassing-equipment-setup-300x173.webp 300w, https:\/\/topsilsilicone.com\/wp-content\/uploads\/production-scale-silicone-degassing-equipment-setup-768x442.webp 768w, https:\/\/topsilsilicone.com\/wp-content\/uploads\/production-scale-silicone-degassing-equipment-setup-18x10.webp 18w, https:\/\/topsilsilicone.com\/wp-content\/uploads\/production-scale-silicone-degassing-equipment-setup-600x346.webp 600w\" sizes=\"(max-width: 1000px) 100vw, 1000px\" \/><\/noscript><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">A reliable process starts by linking each equipment variable to its effect on silicone behavior.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td><strong>Equipment or Process Variable<\/strong><strong><\/strong><\/td><td><strong>Possible Silicone Consequence<\/strong><strong><\/strong><\/td><\/tr><tr><td>Chamber too short<\/td><td>Foam reaches the lid or vacuum line<\/td><\/tr><tr><td>Container too full<\/td><td>Overflow before target pressure<\/td><\/tr><tr><td>Container too deep<\/td><td>Longer bubble escape path<\/td><\/tr><tr><td>Hose too narrow<\/td><td>Slow pump-down consumes pot life<\/td><\/tr><tr><td>Vacuum ramp too fast<\/td><td>Sudden foam expansion<\/td><\/tr><tr><td>Venting too fast<\/td><td>Splashing and surface disturbance<\/td><\/tr><tr><td>Transfer drop too high<\/td><td>Air reintroduced after degassing<\/td><\/tr><tr><td>Working time too short<\/td><td>Silicone thickens before pouring<\/td><\/tr><tr><td>Viscosity too high<\/td><td>Slower bubble movement<\/td><\/tr><tr><td>Poor mixing-container shape<\/td><td>Unmixed material remains in corners<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">The best solution may therefore involve a material change, equipment change or handling change\u2014not necessarily all three.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Choose the Right Degassing Architecture<\/strong><strong><\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Production scale does not always mean using a separate chamber after manual mixing.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td><strong>Degassing Approach<\/strong><strong><\/strong><\/td><td><strong>Best Fit<\/strong><strong><\/strong><\/td><td><strong>\u0627\u0644\u0642\u064a\u062f \u0627\u0644\u0631\u0626\u064a\u0633\u064a<\/strong><strong><\/strong><\/td><\/tr><tr><td>Degas after manual mixing<\/td><td>Flexible small and medium batches<\/td><td>Uses part of the mixed-material working time<\/td><\/tr><tr><td>Pre-degas Parts A and B separately<\/td><td>Components containing stored or transported air<\/td><td>Air can be reintroduced during final mixing<\/td><\/tr><tr><td>Mix under vacuum<\/td><td>Larger repeat batches<\/td><td>Higher equipment and cleaning requirements<\/td><\/tr><tr><td>Meter-mix-dispense system<\/td><td>Repetitive production requiring ratio control<\/td><td>Requires equipment validation and maintenance<\/td><\/tr><tr><td>Vacuum casting after degassing<\/td><td>Complex molds with filling-related air risk<\/td><td>Does not correct poor A\/B mixing<\/td><\/tr><tr><td>Degassed reservoir with automatic dispensing<\/td><td>Semi-continuous production<\/td><td>Requires stable storage and process control<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">A separate mixer and chamber may remain the most economical solution for flexible production. A vacuum mixing vessel becomes more attractive when manual transfer, operator variation and cycle losses become significant.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Upgrade equipment when recurring labor, rejected molds, overflow loss and downtime cost more than the automation required to remove them.<\/strong><\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Chamber and Container Setup<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The chamber must accommodate:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>The mixing container<\/li>\n\n\n\n<li>Maximum temporary foam expansion<\/li>\n\n\n\n<li>Safe vertical clearance<\/li>\n\n\n\n<li>Vacuum fittings<\/li>\n\n\n\n<li>Catch pot or trap<\/li>\n\n\n\n<li>Convenient loading and cleaning<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Do not select the chamber only by its total liter capacity. A chamber may have enough internal volume but insufficient height.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The container should provide:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Adequate headspace<\/li>\n\n\n\n<li>Accessible bottom and corners<\/li>\n\n\n\n<li>Easy scraping and mixing<\/li>\n\n\n\n<li>Stable handling<\/li>\n\n\n\n<li>Compatibility with the chamber<\/li>\n\n\n\n<li>Controlled transfer after degassing<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">There is no universal safe fill percentage for every platinum silicone.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The maximum foam-rise ratio should be measured for each grade, batch size, temperature and mixing method.<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\"><strong>Size the container for temporary foam volume, not only initial liquid volume.<\/strong><\/p>\n<\/blockquote>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Pump Selection: Effective Speed Matters More Than Maximum Vacuum<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Many buyers compare pumps only by ultimate pressure.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For production, the more useful question is:<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\"><strong>Can the full system reach the validated operating pressure while enough working time remains for venting, transfer and pouring?<\/strong><\/p>\n<\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\">Pump selection should consider:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Effective pumping speed at the chamber<\/li>\n\n\n\n<li>Chamber and pipe volume<\/li>\n\n\n\n<li>Target absolute pressure<\/li>\n\n\n\n<li>Required pump-down time<\/li>\n\n\n\n<li>Batch frequency<\/li>\n\n\n\n<li>Continuous-duty capability<\/li>\n\n\n\n<li>Contamination tolerance<\/li>\n\n\n\n<li>Maintenance requirements<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Nominal pump capacity is reduced by:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Narrow hoses<\/li>\n\n\n\n<li>Long pipe runs<\/li>\n\n\n\n<li>Bends<\/li>\n\n\n\n<li>Filters<\/li>\n\n\n\n<li>Traps<\/li>\n\n\n\n<li>Valves<\/li>\n\n\n\n<li>Leaks<\/li>\n\n\n\n<li>Pump wear<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Use an <strong>absolute-pressure gauge<\/strong> where possible. Terms such as \u201cfull vacuum\u201d or \u201c\u20130.1 MPa\u201d can be ambiguous.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Preferred production references include:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>mbar absolute<\/li>\n\n\n\n<li>kPa absolute<\/li>\n\n\n\n<li>Pa absolute<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">The correct pressure remains product-specific. A deeper vacuum is not automatically more efficient.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Estimating Pump-Down Time<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">A simplified preliminary estimate is:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>t \u2248 (V \u00f7 Seff) \u00d7 <\/strong><strong>ln<\/strong><strong>(P1 \u00f7 P2)<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Where:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>t<\/code> = estimated pump-down time<\/li>\n\n\n\n<li><code>V<\/code> = chamber and connected-system volume<\/li>\n\n\n\n<li><code>Seff<\/code> = effective pumping speed at the chamber<\/li>\n\n\n\n<li><code>P1<\/code> = starting absolute pressure<\/li>\n\n\n\n<li><code>P2<\/code> = target absolute pressure<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">This equation estimates evacuation of a gas volume under simplified conditions.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A foaming silicone batch behaves as a dynamic gas-load system. Actual results are also affected by:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Pressure-dependent pump performance<\/li>\n\n\n\n<li>Material outgassing<\/li>\n\n\n\n<li>Foam generation<\/li>\n\n\n\n<li>Hose conductance<\/li>\n\n\n\n<li>Leaks<\/li>\n\n\n\n<li>Filters<\/li>\n\n\n\n<li>Valve restrictions<\/li>\n\n\n\n<li>Pump condition<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Use the calculation only for initial planning. Final equipment selection should be verified with an actual pump-down curve using the intended batch.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Use a Four-Stage Vacuum Profile<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">Stage 1: Controlled pull-down<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Reduce pressure gradually and observe when foam begins to rise.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Stage 2: Foam-rise control<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">As the material expands:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Throttle the vacuum line<\/li>\n\n\n\n<li>Pause pressure reduction<\/li>\n\n\n\n<li>Reduce pump speed<\/li>\n\n\n\n<li>Introduce a small controlled vent if necessary<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">The aim is to prevent overflow without repeatedly returning the chamber to full atmospheric pressure.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Stage 3: Validated degassing hold<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">After the foam rises, breaks and falls, continue to the validated operating pressure.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Hold only as long as required to achieve the approved defect level.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Stage 4: Controlled venting and transfer<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Return to atmospheric pressure gradually. Transfer with low turbulence and minimize the pouring height.<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\"><strong>The best cycle is the shortest stable cycle that achieves the acceptance standard without consuming excessive working time.<\/strong><\/p>\n<\/blockquote>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Measure the Complete Production Cycle<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Vacuum hold time is only one part of the process.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The full cycle includes:<\/p>\n\n\n\n<ol start=\"1\" class=\"wp-block-list\">\n<li>Weighing<\/li>\n\n\n\n<li>\u0627\u0644\u062e\u0644\u0637<\/li>\n\n\n\n<li>Loading<\/li>\n\n\n\n<li>Pump-down<\/li>\n\n\n\n<li>Foam control<\/li>\n\n\n\n<li>Vacuum hold<\/li>\n\n\n\n<li>Venting<\/li>\n\n\n\n<li>Transfer<\/li>\n\n\n\n<li>Pouring<\/li>\n\n\n\n<li>\u0627\u0644\u062a\u0646\u0638\u064a\u0641<\/li>\n<\/ol>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Recommended KPIs include:<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td><strong>KPI<\/strong><strong><\/strong><\/td><td><strong>What It Reveals<\/strong><strong><\/strong><\/td><\/tr><tr><td>Pump-down time<\/td><td>Pump, leakage and line performance<\/td><\/tr><tr><td>Maximum foam height<\/td><td>Headspace requirement<\/td><\/tr><tr><td>Time to foam collapse<\/td><td>Material and mixing behavior<\/td><\/tr><tr><td>Total degassing cycle<\/td><td>Production throughput<\/td><\/tr><tr><td>Material temperature<\/td><td>Viscosity and cure variation<\/td><\/tr><tr><td>Minimum absolute pressure<\/td><td>Equipment repeatability<\/td><\/tr><tr><td>Overflow incidents<\/td><td>Container or ramp problem<\/td><\/tr><tr><td>Final defect rate<\/td><td>Actual process quality<\/td><\/tr><tr><td>Rejected molds<\/td><td>Commercial impact<\/td><\/tr><tr><td>Cleaning time<\/td><td>Hidden labor and downtime<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Trend these values over time. A gradual increase in pump-down time may indicate leakage, filter blockage, pump contamination or maintenance drift.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">To <a href=\"https:\/\/www.leybold.com\/en\/knowledge\/vacuum-fundamentals\/vacuum-generation\/how-to-choose-a-pump-size\" target=\"_blank\" rel=\"noopener\">choose a vacuum pump size<\/a>, start from the required pump-down time and effective speed at the chamber\u2014not only the pump\u2019s ultimate pressure.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Illustrative Optimization Example<\/strong><strong><\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Consider a hypothetical 25 kg platinum silicone batch.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Original process<\/strong><strong><\/strong><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>80 L chamber<\/li>\n\n\n\n<li>Short-working-time silicone<\/li>\n\n\n\n<li>Container filled with limited headspace<\/li>\n\n\n\n<li>Full vacuum applied immediately<\/li>\n\n\n\n<li>Repeated overflow<\/li>\n\n\n\n<li>Operator vents manually several times<\/li>\n\n\n\n<li>Total cycle approximately 12 minutes<\/li>\n\n\n\n<li>Some bubbles appear after pouring<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Replacing the pump alone makes the foam rise faster but does not solve the problem.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Revised process<\/strong><strong><\/strong><\/h3>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td><strong>Change<\/strong><strong><\/strong><\/td><td><strong>Expected Effect<\/strong><strong><\/strong><\/td><\/tr><tr><td>Larger container with more headspace<\/td><td>Reduces overflow risk<\/td><\/tr><tr><td>Wider and shorter vacuum hose<\/td><td>Reduces line restriction<\/td><\/tr><tr><td>Controlled pressure ramp<\/td><td>Stabilizes foam rise<\/td><\/tr><tr><td>Absolute-pressure gauge<\/td><td>Improves repeatability<\/td><\/tr><tr><td>Defined foam-collapse endpoint<\/td><td>Reduces operator variation<\/td><\/tr><tr><td>Catch pot<\/td><td>Protects pump and vacuum line<\/td><\/tr><tr><td>Low-point pouring<\/td><td>Reduces re-aeration<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">In this illustrative scenario, the revised process is assumed to reduce the total cycle from about 12 minutes to approximately 7 minutes while improving repeatability.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This is not a guaranteed result. Actual performance depends on silicone grade, equipment, temperature and batch conditions.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The lesson is:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>A larger pump cannot correct inadequate headspace, uncontrolled pressure reduction or air reintroduced after degassing.<\/strong><\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Troubleshooting Matrix<\/strong><strong><\/strong><\/h2>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td><strong>\u0627\u0644\u0645\u0634\u0643\u0644\u0629<\/strong><strong><\/strong><\/td><td><strong>Likely Cause<\/strong><strong><\/strong><\/td><td><strong>Check First<\/strong><strong><\/strong><\/td><\/tr><tr><td>Silicone overflows<\/td><td>Container too full or vacuum ramp too fast<\/td><td>Headspace and pressure profile<\/td><\/tr><tr><td>Bubbles remain<\/td><td>Insufficient degassing or high viscosity<\/td><td>Gauge, leaks and endpoint<\/td><\/tr><tr><td>Silicone thickens in chamber<\/td><td>Pump-down too slow<\/td><td>Temperature, pump capacity and pot life<\/td><\/tr><tr><td>Bubbles return after pouring<\/td><td>Air reintroduced during transfer<\/td><td>Pouring height and flow path<\/td><\/tr><tr><td>Cycle varies between operators<\/td><td>Process depends on personal judgment<\/td><td>SOP and measurable endpoints<\/td><\/tr><tr><td>Target pressure cannot be reached<\/td><td>Leak or restriction<\/td><td>Seals, hose, valves and filters<\/td><\/tr><tr><td>Silicone enters vacuum line<\/td><td>Excessive foam or no trap<\/td><td>Fill level and catch pot<\/td><\/tr><tr><td>Pump performance declines<\/td><td>Contamination or overdue maintenance<\/td><td>Oil, filters and seals<\/td><\/tr><tr><td>Soft or uncured areas appear<\/td><td>Mixing or cure-inhibition problem<\/td><td>A\/B ratio, scraping and compatibility<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Vacuum Equipment Safety<\/strong><strong><\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Use equipment specifically designed and rated for full vacuum.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Do not use unverified glass, plastic containers or modified vessels.<\/li>\n\n\n\n<li>Inspect lids, seals, clamps and viewing windows regularly.<\/li>\n\n\n\n<li>Use appropriate guarding where required.<\/li>\n\n\n\n<li>Isolate power and vacuum before maintenance.<\/li>\n\n\n\n<li>Prevent silicone from entering the pump.<\/li>\n\n\n\n<li>Follow the chamber and pump manufacturer\u2019s operating instructions.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Vacuum safety should be part of the production SOP, not an afterthought.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>When Is Equipment Upgrading Financially Justified?<\/strong><strong><\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Track the annual cost of:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Rejected molds<\/li>\n\n\n\n<li>Overflowed silicone<\/li>\n\n\n\n<li>Rework labor<\/li>\n\n\n\n<li>Lost production time<\/li>\n\n\n\n<li>\u0627\u0644\u062a\u0646\u0638\u064a\u0641<\/li>\n\n\n\n<li>Pump contamination<\/li>\n\n\n\n<li>Operator variation<\/li>\n\n\n\n<li>Delayed delivery<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A simple management comparison is:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Annual avoidable process cost = rejection cost + material loss + rework + downtime + contamination-related maintenance<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Compare that amount with the expected equipment investment and operating cost.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The most expensive system is not automatically the best. The correct system is the one that removes enough recurring cost and variation to justify the upgrade.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Topsil silicone Scale-Up Process Review<\/strong><strong><\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">In scale-up discussions, customers often first ask whether they need a larger pump.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">In practice, the more important bottleneck may be insufficient headspace, a working time that is too short for the batch, a restricted vacuum line or air reintroduced during pouring.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For a process review, send Topsil:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Current silicone TDS<\/li>\n\n\n\n<li>Mixed viscosity<\/li>\n\n\n\n<li>Batch size<\/li>\n\n\n\n<li>\u0648\u0642\u062a \u0627\u0644\u0639\u0645\u0644<\/li>\n\n\n\n<li>Material temperature<\/li>\n\n\n\n<li>Chamber volume<\/li>\n\n\n\n<li>Container dimensions<\/li>\n\n\n\n<li>Pump model<\/li>\n\n\n\n<li>Hose diameter and length<\/li>\n\n\n\n<li>Current absolute pressure<\/li>\n\n\n\n<li>Pump-down and total cycle time<\/li>\n\n\n\n<li>Maximum observed foam height<\/li>\n\n\n\n<li>Current defect or overflow problem<\/li>\n\n\n\n<li>Casting material and mold application<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Topsil silicone can help organize the information into a bottleneck review covering:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Material fit<\/li>\n\n\n\n<li>Working-time risk<\/li>\n\n\n\n<li>Chamber headspace<\/li>\n\n\n\n<li>Pump-down performance<\/li>\n\n\n\n<li>Vacuum profile<\/li>\n\n\n\n<li>Transfer and re-aeration risk<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">The review can help determine whether the next trial should change the silicone grade, equipment settings or handling method.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Learn more about Topsil silicone\u2019s <a href=\"https:\/\/topsilsilicone.com\/ar\/%d8%a7%d9%84%d9%85%d9%86%d8%aa%d8%ac%d8%a7%d8%aa\/%d8%b3%d9%8a%d9%84%d9%8a%d9%83%d9%88%d9%86-%d9%85%d8%b9%d8%a7%d9%84%d8%ac-%d8%a8%d8%a7%d9%84%d8%a8%d9%84%d8%a7%d8%aa%d9%8a%d9%86\/\">\u0633\u064a\u0644\u064a\u0643\u0648\u0646 \u0645\u0639\u0627\u0644\u062c \u0628\u0627\u0644\u0628\u0644\u0627\u062a\u064a\u0646<\/a> for professional mold making.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For PU casting projects, visit <a href=\"https:\/\/topsilsilicone.com\/ar\/%d8%a7%d9%84%d8%aa%d8%b7%d8%a8%d9%8a%d9%82%d8%a7%d8%aa\/%d8%b3%d9%8a%d9%84%d9%8a%d9%83%d9%88%d9%86-%d9%84%d9%84%d9%86%d9%85%d8%a7%d8%b0%d8%ac-%d8%a7%d9%84%d8%a3%d9%88%d9%84%d9%8a%d8%a9-%d8%a7%d9%84%d8%b3%d8%b1%d9%8a%d8%b9%d8%a9\/\">\u0627\u0644\u0633\u064a\u0644\u064a\u0643\u0648\u0646 \u0644\u0644\u0646\u0645\u0627\u0630\u062c \u0627\u0644\u0623\u0648\u0644\u064a\u0629 \u0627\u0644\u0633\u0631\u064a\u0639\u0629<\/a>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For application support, contact <a href=\"https:\/\/topsilsilicone.com\/ar\/%d8%a7%d9%84%d8%af%d8%b9%d9%85-%d8%a7%d9%84%d9%81%d9%86%d9%8a\/\">RTV-2 Silicone Technical Support<\/a>.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>\u0627\u0644\u0623\u0633\u0626\u0644\u0629 \u0627\u0644\u0634\u0627\u0626\u0639\u0629<\/strong><strong><\/strong><\/h2>\n\n\n<div class=\"wp-block-uagb-faq uagb-faq__outer-wrap uagb-block-c9af9b46 uagb-faq-icon-row-reverse uagb-faq-layout-accordion uagb-faq-expand-first-false uagb-faq-inactive-other-true uagb-faq__wrap uagb-buttons-layout-wrap uagb-faq-equal-height     faq-clean\" data-faqtoggle=\"true\" role=\"tablist\"><script type=\"application\/ld+json\">{\n    \"@context\": \"https:\\\/\\\/schema.org\",\n    \"@type\": \"FAQPage\",\n    \"@id\": \"https:\\\/\\\/topsilsilicone.com\\\/ar\\\/how-to-degas-platinum-silicone-at-scale-equipment-cycle-guide\\\/\",\n    \"mainEntity\": [\n        {\n            \"@type\": \"Question\",\n            \"name\": \"<strong>What should be controlled first when scaling silicone degassing?<\\\/strong>\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"Start with the acceptance standard, maximum batch size, usable working time and maximum foam rise. These determine whether the current material, container, chamber and pump can operate within one stable cycle.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"<strong>How much headspace does platinum silicone need?<\\\/strong>\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"There is no universal percentage. Measure the maximum temporary foam volume for the selected grade, batch mass, temperature and mixing method, then add an appropriate operating margin.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"<strong>Why can a larger vacuum pump make overflow worse?<\\\/strong>\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"A larger pump may reduce pressure too quickly, causing rapid foam expansion. Without enough headspace or controlled ramping, stronger pumping can increase material loss instead of improving quality.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"<strong>When should a factory use a vacuum mixer instead of a separate chamber?<\\\/strong>\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"Consider a vacuum mixer when manual transfer, repeated loading, operator variation and loss of working time create more recurring cost than the additional equipment, cleaning and maintenance requirements.\"\n            }\n        }\n    ]\n}<\/script><div class=\"wp-block-uagb-faq-child uagb-faq-child__outer-wrap uagb-faq-item uagb-block-e415ceab\" role=\"tab\" tabindex=\"0\"><div class=\"uagb-faq-questions-button uagb-faq-questions\">\t\t\t<span class=\"uagb-icon uagb-faq-icon-wrap\">\n\t\t\t\t\t\t\t\t<svg xmlns=\"https:\/\/www.w3.org\/2000\/svg\" viewbox= \"0 0 448 512\"><path d=\"M432 256c0 17.69-14.33 32.01-32 32.01H256v144c0 17.69-14.33 31.99-32 31.99s-32-14.3-32-31.99v-144H48c-17.67 0-32-14.32-32-32.01s14.33-31.99 32-31.99H192v-144c0-17.69 14.33-32.01 32-32.01s32 14.32 32 32.01v144h144C417.7 224 432 238.3 432 256z\"><\/path><\/svg>\n\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t<span class=\"uagb-icon-active uagb-faq-icon-wrap\">\n\t\t\t\t\t\t\t\t<svg xmlns=\"https:\/\/www.w3.org\/2000\/svg\" viewbox= \"0 0 448 512\"><path d=\"M400 288h-352c-17.69 0-32-14.32-32-32.01s14.31-31.99 32-31.99h352c17.69 0 32 14.3 32 31.99S417.7 288 400 288z\"><\/path><\/svg>\n\t\t\t\t\t\t\t<\/span>\n\t\t\t<h4 class=\"uagb-question\"><strong>What should be controlled first when scaling silicone degassing?<\/strong><\/h4><\/div><div class=\"uagb-faq-content\"><p>Start with the acceptance standard, maximum batch size, usable working time and maximum foam rise. These determine whether the current material, container, chamber and pump can operate within one stable cycle.<\/p><\/div><\/div><div class=\"wp-block-uagb-faq-child uagb-faq-child__outer-wrap uagb-faq-item uagb-block-8b974d1b\" role=\"tab\" tabindex=\"0\"><div class=\"uagb-faq-questions-button uagb-faq-questions\">\t\t\t<span class=\"uagb-icon uagb-faq-icon-wrap\">\n\t\t\t\t\t\t\t\t<svg xmlns=\"https:\/\/www.w3.org\/2000\/svg\" viewbox= \"0 0 448 512\"><path d=\"M432 256c0 17.69-14.33 32.01-32 32.01H256v144c0 17.69-14.33 31.99-32 31.99s-32-14.3-32-31.99v-144H48c-17.67 0-32-14.32-32-32.01s14.33-31.99 32-31.99H192v-144c0-17.69 14.33-32.01 32-32.01s32 14.32 32 32.01v144h144C417.7 224 432 238.3 432 256z\"><\/path><\/svg>\n\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t<span class=\"uagb-icon-active uagb-faq-icon-wrap\">\n\t\t\t\t\t\t\t\t<svg xmlns=\"https:\/\/www.w3.org\/2000\/svg\" viewbox= \"0 0 448 512\"><path d=\"M400 288h-352c-17.69 0-32-14.32-32-32.01s14.31-31.99 32-31.99h352c17.69 0 32 14.3 32 31.99S417.7 288 400 288z\"><\/path><\/svg>\n\t\t\t\t\t\t\t<\/span>\n\t\t\t<h4 class=\"uagb-question\"><strong>How much headspace does platinum silicone need?<\/strong><\/h4><\/div><div class=\"uagb-faq-content\"><p>There is no universal percentage. Measure the maximum temporary foam volume for the selected grade, batch mass, temperature and mixing method, then add an appropriate operating margin.<\/p><\/div><\/div><div class=\"wp-block-uagb-faq-child uagb-faq-child__outer-wrap uagb-faq-item uagb-block-d8950e4b\" role=\"tab\" tabindex=\"0\"><div class=\"uagb-faq-questions-button uagb-faq-questions\">\t\t\t<span class=\"uagb-icon uagb-faq-icon-wrap\">\n\t\t\t\t\t\t\t\t<svg xmlns=\"https:\/\/www.w3.org\/2000\/svg\" viewbox= \"0 0 448 512\"><path d=\"M432 256c0 17.69-14.33 32.01-32 32.01H256v144c0 17.69-14.33 31.99-32 31.99s-32-14.3-32-31.99v-144H48c-17.67 0-32-14.32-32-32.01s14.33-31.99 32-31.99H192v-144c0-17.69 14.33-32.01 32-32.01s32 14.32 32 32.01v144h144C417.7 224 432 238.3 432 256z\"><\/path><\/svg>\n\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t<span class=\"uagb-icon-active uagb-faq-icon-wrap\">\n\t\t\t\t\t\t\t\t<svg xmlns=\"https:\/\/www.w3.org\/2000\/svg\" viewbox= \"0 0 448 512\"><path d=\"M400 288h-352c-17.69 0-32-14.32-32-32.01s14.31-31.99 32-31.99h352c17.69 0 32 14.3 32 31.99S417.7 288 400 288z\"><\/path><\/svg>\n\t\t\t\t\t\t\t<\/span>\n\t\t\t<h4 class=\"uagb-question\"><strong>Why can a larger vacuum pump make overflow worse?<\/strong><\/h4><\/div><div class=\"uagb-faq-content\"><p>A larger pump may reduce pressure too quickly, causing rapid foam expansion. Without enough headspace or controlled ramping, stronger pumping can increase material loss instead of improving quality.<\/p><\/div><\/div><div class=\"wp-block-uagb-faq-child uagb-faq-child__outer-wrap uagb-faq-item uagb-block-c72757d0\" role=\"tab\" tabindex=\"0\"><div class=\"uagb-faq-questions-button uagb-faq-questions\">\t\t\t<span class=\"uagb-icon uagb-faq-icon-wrap\">\n\t\t\t\t\t\t\t\t<svg xmlns=\"https:\/\/www.w3.org\/2000\/svg\" viewbox= \"0 0 448 512\"><path d=\"M432 256c0 17.69-14.33 32.01-32 32.01H256v144c0 17.69-14.33 31.99-32 31.99s-32-14.3-32-31.99v-144H48c-17.67 0-32-14.32-32-32.01s14.33-31.99 32-31.99H192v-144c0-17.69 14.33-32.01 32-32.01s32 14.32 32 32.01v144h144C417.7 224 432 238.3 432 256z\"><\/path><\/svg>\n\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t<span class=\"uagb-icon-active uagb-faq-icon-wrap\">\n\t\t\t\t\t\t\t\t<svg xmlns=\"https:\/\/www.w3.org\/2000\/svg\" viewbox= \"0 0 448 512\"><path d=\"M400 288h-352c-17.69 0-32-14.32-32-32.01s14.31-31.99 32-31.99h352c17.69 0 32 14.3 32 31.99S417.7 288 400 288z\"><\/path><\/svg>\n\t\t\t\t\t\t\t<\/span>\n\t\t\t<h4 class=\"uagb-question\"><strong>When should a factory use a vacuum mixer instead of a separate chamber?<\/strong><\/h4><\/div><div class=\"uagb-faq-content\"><p>Consider a vacuum mixer when manual transfer, repeated loading, operator variation and loss of working time create more recurring cost than the additional equipment, cleaning and maintenance requirements.<\/p><\/div><\/div><\/div>","protected":false},"excerpt":{"rendered":"<p>A vacuum process that works for a 2 kg laboratory batch can fail completely when the same platinum silicone is mixed in a 30 kg production batch. The material may overflow before the target pressure is reached. Pump-down may consume too much of the working time. The chamber may remove most of the air, only [&hellip;]<\/p>","protected":false},"author":4,"featured_media":8848,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_uag_custom_page_level_css":"","footnotes":""},"categories":[90],"tags":[],"class_list":["post-8840","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-technical-faqs"],"uagb_featured_image_src":{"full":["https:\/\/topsilsilicone.com\/wp-content\/uploads\/how-to-degas-platinum-silicone-at-scale.webp",1000,558,false],"thumbnail":["https:\/\/topsilsilicone.com\/wp-content\/uploads\/how-to-degas-platinum-silicone-at-scale-150x150.webp",150,150,true],"medium":["https:\/\/topsilsilicone.com\/wp-content\/uploads\/how-to-degas-platinum-silicone-at-scale-300x167.webp",300,167,true],"medium_large":["https:\/\/topsilsilicone.com\/wp-content\/uploads\/how-to-degas-platinum-silicone-at-scale-768x429.webp",768,429,true],"large":["https:\/\/topsilsilicone.com\/wp-content\/uploads\/how-to-degas-platinum-silicone-at-scale.webp",800,446,false],"1536x1536":["https:\/\/topsilsilicone.com\/wp-content\/uploads\/how-to-degas-platinum-silicone-at-scale.webp",1000,558,false],"2048x2048":["https:\/\/topsilsilicone.com\/wp-content\/uploads\/how-to-degas-platinum-silicone-at-scale.webp",1000,558,false],"trp-custom-language-flag":["https:\/\/topsilsilicone.com\/wp-content\/uploads\/how-to-degas-platinum-silicone-at-scale-18x10.webp",18,10,true],"woocommerce_thumbnail":["https:\/\/topsilsilicone.com\/wp-content\/uploads\/how-to-degas-platinum-silicone-at-scale-300x300.webp",300,300,true],"woocommerce_single":["https:\/\/topsilsilicone.com\/wp-content\/uploads\/how-to-degas-platinum-silicone-at-scale-600x335.webp",600,335,true],"woocommerce_gallery_thumbnail":["https:\/\/topsilsilicone.com\/wp-content\/uploads\/how-to-degas-platinum-silicone-at-scale-100x100.webp",100,100,true]},"uagb_author_info":{"display_name":"Michael","author_link":"https:\/\/topsilsilicone.com\/ar\/author\/michael\/"},"uagb_comment_info":0,"uagb_excerpt":"A vacuum process that works for a 2 kg laboratory batch can fail completely when the same platinum silicone is mixed in a 30 kg production batch. The material may overflow before the target pressure is reached. Pump-down may consume too much of the working time. The chamber may remove most of the air, only&hellip;","_links":{"self":[{"href":"https:\/\/topsilsilicone.com\/ar\/wp-json\/wp\/v2\/posts\/8840","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/topsilsilicone.com\/ar\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/topsilsilicone.com\/ar\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/topsilsilicone.com\/ar\/wp-json\/wp\/v2\/users\/4"}],"replies":[{"embeddable":true,"href":"https:\/\/topsilsilicone.com\/ar\/wp-json\/wp\/v2\/comments?post=8840"}],"version-history":[{"count":5,"href":"https:\/\/topsilsilicone.com\/ar\/wp-json\/wp\/v2\/posts\/8840\/revisions"}],"predecessor-version":[{"id":8854,"href":"https:\/\/topsilsilicone.com\/ar\/wp-json\/wp\/v2\/posts\/8840\/revisions\/8854"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/topsilsilicone.com\/ar\/wp-json\/wp\/v2\/media\/8848"}],"wp:attachment":[{"href":"https:\/\/topsilsilicone.com\/ar\/wp-json\/wp\/v2\/media?parent=8840"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/topsilsilicone.com\/ar\/wp-json\/wp\/v2\/categories?post=8840"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/topsilsilicone.com\/ar\/wp-json\/wp\/v2\/tags?post=8840"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}