{"id":6152,"date":"2025-07-17T14:17:36","date_gmt":"2025-07-17T06:17:36","guid":{"rendered":"https:\/\/globalquartztube.com\/?p=6152"},"modified":"2025-08-12T14:56:14","modified_gmt":"2025-08-12T06:56:14","slug":"high-pressure-quartz-tube-sealing-guide","status":"publish","type":"post","link":"https:\/\/globalquartztube.com\/pa\/high-pressure-quartz-tube-sealing-guide\/","title":{"rendered":"High-Pressure Quartz Tube Sealing Guide"},"content":{"rendered":"<p><strong>Technical Guide for Sealing Quartz Tubes in High-Pressure Conditions (\u226510MPa)<\/strong><br><strong>Selection, Installation &amp; Verification Procedures for Quartz, Alumina, and Sapphire Tubes<\/strong><\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>1. Seal Type Comparison Table<\/strong><\/h3>\n\n\n\n<p><\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Seal Type<\/th><th>Max Pressure<\/th><th>Temp Range<\/th><th>Reusable<\/th><th>Tube Diameter Range<\/th><th>Recommended Use Case<\/th><\/tr><\/thead><tbody><tr><td>Metal Flange + Conical Seal<\/td><td>\u226430\u202fMPa<\/td><td>-200\u202f~\u202f500\u202f\u00b0C<\/td><td>\u2713<\/td><td>5\u2013100\u202fmm<\/td><td>High-pressure reactors requiring frequent access<\/td><\/tr><tr><td>Glass Fusion Seal<\/td><td>\u226415\u202fMPa<\/td><td>\u2264450\u202f\u00b0C<\/td><td>\u2717<\/td><td>3\u201350\u202fmm<\/td><td>Permanent sensor encapsulation<\/td><\/tr><tr><td>Hydraulic Cold Compression<\/td><td>\u2264100\u202fMPa<\/td><td>-273\u202f~\u202f1000\u202f\u00b0C<\/td><td>\u2717<\/td><td>3\u201320\u202fmm (thick wall)<\/td><td>Extreme pressure\/cryogenic applications<\/td><\/tr><tr><td>Metallized Brazing<\/td><td>\u226450\u202fMPa<\/td><td>\u22641000\u202f\u00b0C<\/td><td>\u2717<\/td><td>3\u201320\u202fmm<\/td><td>Aerospace and defense-grade reliability<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>2. Metal Flange with Conical Seal (Recommended Method)<\/strong><\/h3>\n\n\n\n<p><\/p>\n\n\n\n<h4 class=\"wp-block-heading\"><strong>1. Required Components<\/strong><\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Flange Material<\/strong>: Inconel 718 (corrosion-resistant nickel alloy)<\/li>\n\n\n\n<li><strong>Seal Gasket<\/strong>: Annealed copper (1\u202fmm thick, HV50 hardness)<\/li>\n\n\n\n<li><strong>Conical Angle<\/strong>: 20\u00b0 \u00b1 0.5\u00b0 (must match tube precision-ground taper)<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\"><strong>2. Installation Procedure<\/strong><\/h4>\n\n\n\n<h5 class=\"wp-block-heading\"><strong>\u2460 Preparation<\/strong><\/h5>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Flame polish quartz tube ends to eliminate microcracks<\/li>\n\n\n\n<li>Mirror-polish flange taper surface (Ra \u2264 0.8\u202f\u03bcm)<\/li>\n<\/ul>\n\n\n\n<h5 class=\"wp-block-heading\"><strong>\u2461 Assembly<\/strong><\/h5>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Place the copper gasket on the flange cone<\/li>\n\n\n\n<li>Apply high-temp vacuum grease (e.g., Apiezon N) to the tube\u2019s taper<\/li>\n\n\n\n<li>Tighten bolts progressively using a hydraulic torque wrench<\/li>\n<\/ol>\n\n\n\n<p><strong>Bolt Torque Schedule (for M6 bolts):<\/strong><\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Stage<\/th><th>Torque (N\u00b7m)<\/th><th>Dwell Time<\/th><\/tr><\/thead><tbody><tr><td>Preload<\/td><td>10<\/td><td>5 min<\/td><\/tr><tr><td>Mid<\/td><td>20<\/td><td>10 min<\/td><\/tr><tr><td>Final<\/td><td>30<\/td><td>30 min<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h4 class=\"wp-block-heading\"><strong>3. Leak Testing Criteria<\/strong><\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Helium Leak Rate<\/strong>: \u2264\u202f1\u00d710\u207b\u2078\u202fmbar\u00b7L\/s<\/li>\n\n\n\n<li><strong>Pressure Hold Test<\/strong>: 15\u202fMPa for 1 hour, pressure drop &lt;1%<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>3. Safety Precautions<\/strong><\/h3>\n\n\n\n<p><\/p>\n\n\n\n<h4 class=\"wp-block-heading\"><strong>1. Explosion Protection<\/strong><\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li>6\u202fmm polycarbonate blast shield around the tube (with IR camera window optional)<\/li>\n\n\n\n<li>Install mechanical pressure relief valve (setpoint = 12\u202fMPa)<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\"><strong>2. Operational Guidelines<\/strong><\/h4>\n\n\n\n<p><strong>Do Not:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u2717 Rapid pressurization (use \u2264\u202f1\u202fMPa\/min pressure ramp)<\/li>\n\n\n\n<li>\u2717 Overpressure at ambient temperature (preheat to \u2265\u202f100\u202f\u00b0C before pressurizing)<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>4. Failure Case Studies<\/strong><\/h3>\n\n\n\n<p><\/p>\n\n\n\n<p><strong>Case 1: Flange Seal Leak (POSTECH Case)<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Issue<\/strong>: Helium leak rate surged at 8\u202fMPa<\/li>\n\n\n\n<li><strong>Root Cause<\/strong>: Gasket was not annealed; high hardness prevented proper deformation<\/li>\n\n\n\n<li><strong>Solution<\/strong>: Switched to HV50 soft copper; leak reduced by 100\u00d7<\/li>\n<\/ul>\n\n\n\n<p><strong>Case 2: Tube Fracture (NIMS Japan Lab)<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Issue<\/strong>: Longitudinal cracking at 12\u202fMPa<\/li>\n\n\n\n<li><strong>Root Cause<\/strong>: Subsurface flaw from laser cutting went undetected<\/li>\n\n\n\n<li><strong>Improvement<\/strong>: Supplier now must provide <strong>fluorescent penetrant inspection report<\/strong><\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>5. Technical Support<\/strong><\/h3>\n\n\n\n<p><\/p>\n\n\n\n<p><strong>Quartz Tube Supplier | Customizable Tubes &amp; Heaters | GlobalQT<\/strong><br>For further consultation based on specific test parameters (e.g., CO\u2082 phase, ramp rate, etc.), please <a href=\"https:\/\/globalquartztube.com\/pa\/contact\/\">\u0a38\u0a3e\u0a21\u0a47 \u0a28\u0a3e\u0a32 \u0a38\u0a70\u0a2a\u0a30\u0a15 \u0a15\u0a30\u0a4b<\/a>.<\/p>\n\n\n\n<p>This document should be revised by the experimenter based on specific experimental parameters (e.g., CO\u2082 phase state, heating rate, etc.).<\/p>","protected":false},"excerpt":{"rendered":"<p>Technical Guide for Sealing Quartz Tubes in High-Pressure Conditions (\u226510MPa)Selection, Installation &amp; Verification Procedures for Quartz, Alumina, and Sapphire Tubes 1. Seal Type Comparison Table Seal Type Max Pressure Temp Range Reusable Tube Diameter Range Recommended Use Case Metal Flange + Conical Seal \u226430\u202fMPa -200\u202f~\u202f500\u202f\u00b0C \u2713 5\u2013100\u202fmm High-pressure reactors requiring frequent access Glass Fusion Seal [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":6158,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_seopress_robots_primary_cat":"none","_seopress_titles_title":"High-Pressure Quartz Tube Sealing Guide","_seopress_titles_desc":"Technical guide for sealing quartz tubes under \u226510MPa pressure. Includes method selection, installation steps, leak testing, and safety measures for high-pressure use.","_seopress_robots_index":"","_uag_custom_page_level_css":"","site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[1],"tags":[],"ppma_author":[21],"class_list":["post-6152","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-uncategorized","author-nola"],"uagb_featured_image_src":{"full":["https:\/\/globalquartztube.com\/wp-content\/uploads\/2025\/07\/High-Pressure-Quartz-Tube-Sealing-Guide.jpg",955,945,false],"thumbnail":["https:\/\/globalquartztube.com\/wp-content\/uploads\/2025\/07\/High-Pressure-Quartz-Tube-Sealing-Guide-150x150.jpg",150,150,true],"medium":["https:\/\/globalquartztube.com\/wp-content\/uploads\/2025\/07\/High-Pressure-Quartz-Tube-Sealing-Guide-300x297.jpg",300,297,true],"medium_large":["https:\/\/globalquartztube.com\/wp-content\/uploads\/2025\/07\/High-Pressure-Quartz-Tube-Sealing-Guide-768x760.jpg",768,760,true],"large":["https:\/\/globalquartztube.com\/wp-content\/uploads\/2025\/07\/High-Pressure-Quartz-Tube-Sealing-Guide.jpg",955,945,false],"1536x1536":["https:\/\/globalquartztube.com\/wp-content\/uploads\/2025\/07\/High-Pressure-Quartz-Tube-Sealing-Guide.jpg",955,945,false],"2048x2048":["https:\/\/globalquartztube.com\/wp-content\/uploads\/2025\/07\/High-Pressure-Quartz-Tube-Sealing-Guide.jpg",955,945,false],"trp-custom-language-flag":["https:\/\/globalquartztube.com\/wp-content\/uploads\/2025\/07\/High-Pressure-Quartz-Tube-Sealing-Guide-12x12.jpg",12,12,true]},"uagb_author_info":{"display_name":"Nola Zhang","author_link":"https:\/\/globalquartztube.com\/pa\/author\/nola\/"},"uagb_comment_info":19,"uagb_excerpt":"Technical Guide for Sealing Quartz Tubes in High-Pressure Conditions (\u226510MPa)Selection, Installation &amp; Verification Procedures for Quartz, Alumina, and Sapphire Tubes 1. Seal Type Comparison Table Seal Type Max Pressure Temp Range Reusable Tube Diameter Range Recommended Use Case Metal Flange + Conical Seal \u226430\u202fMPa -200\u202f~\u202f500\u202f\u00b0C \u2713 5\u2013100\u202fmm High-pressure reactors requiring frequent access Glass Fusion Seal&hellip;","authors":[{"term_id":21,"user_id":1,"is_guest":0,"slug":"nola","display_name":"Nola Zhang","avatar_url":{"url":"https:\/\/globalquartztube.com\/wp-content\/uploads\/2024\/06\/Casper-Peng.webp","url2x":"https:\/\/globalquartztube.com\/wp-content\/uploads\/2024\/06\/Casper-Peng.webp"},"0":null,"1":"","2":"","3":"","4":"","5":"","6":"","7":""}],"_links":{"self":[{"href":"https:\/\/globalquartztube.com\/pa\/wp-json\/wp\/v2\/posts\/6152","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/globalquartztube.com\/pa\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/globalquartztube.com\/pa\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/globalquartztube.com\/pa\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/globalquartztube.com\/pa\/wp-json\/wp\/v2\/comments?post=6152"}],"version-history":[{"count":5,"href":"https:\/\/globalquartztube.com\/pa\/wp-json\/wp\/v2\/posts\/6152\/revisions"}],"predecessor-version":[{"id":6175,"href":"https:\/\/globalquartztube.com\/pa\/wp-json\/wp\/v2\/posts\/6152\/revisions\/6175"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/globalquartztube.com\/pa\/wp-json\/wp\/v2\/media\/6158"}],"wp:attachment":[{"href":"https:\/\/globalquartztube.com\/pa\/wp-json\/wp\/v2\/media?parent=6152"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/globalquartztube.com\/pa\/wp-json\/wp\/v2\/categories?post=6152"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/globalquartztube.com\/pa\/wp-json\/wp\/v2\/tags?post=6152"},{"taxonomy":"author","embeddable":true,"href":"https:\/\/globalquartztube.com\/pa\/wp-json\/wp\/v2\/ppma_author?post=6152"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}