{"id":4497,"date":"2026-10-06T05:42:19","date_gmt":"2026-10-05T21:42:19","guid":{"rendered":"https:\/\/dzxmetals.com\/case-glass-sealing\/"},"modified":"2026-10-06T05:42:19","modified_gmt":"2026-10-05T21:42:19","slug":"case-glass-sealing","status":"publish","type":"post","link":"https:\/\/dzxmetals.com\/es\/case-glass-sealing\/","title":{"rendered":"Materiales de sellado de vidrio a metal para dispositivos de vac\u00edo"},"content":{"rendered":"<style>.dzx-case{--dc-blue:#1266b1;--dc-dark:#063d68;--dc-ink:#1e293b;--dc-body:#334155;--dc-pale:#f0f5fa;--dc-border:#d1d5db;--dc-orange:#f9960e;box-sizing:border-box;max-width:1140px;margin:0 auto;color:var(--dc-body);font-family:\"Golos Text\",Arial,sans-serif;font-size:16px;line-height:1.8;overflow-wrap:anywhere;text-align:left}\n.dzx-case *{box-sizing:border-box;min-width:0}\n.dzx-case p{margin:0 0 18px;line-height:inherit}\n.dzx-case p:last-child{margin-bottom:0}\n.dzx-case 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table{min-width:460px}.dzx-case .dc-quote-title{font-size:22px}.dzx-case a.dc-bottom-inquiry{display:block;text-align:center}}<\/style>\n<article class=\"dzx-case\" aria-label=\"Glass-to-Metal Sealing Materials for Vacuum Devices\">\n<div class=\"dc-content-bg dc-overview\">\n<div class=\"dc-content\">\n<h2 class=\"dc-about-h2\"> Case Overview <\/h2>\n<div class=\"dc-med-intro\">\n<p class=\"dc-mb-3\"> A glass-to-metal sealing manufacturer supplying vacuum relays and pressure sensors encountered a recurring problem during helium leak testing of a new product: some seals made with the same batch of 4J29 leads passed leak tests, while others developed microleaks after thermal cycling. The team checked the process parameters; the temperature profile, hydrogen flow and fixtures were unchanged. Only after returning the remaining material to the supplier for chemistry and thermal expansion retesting did the cause emerge: after a batch change, the new material&#8217;s expansion curve had shifted outside the matching window of the sealing glass. <\/p>\n<p class=\"dc-mb-3\"> Such manufacturers need more than a certificate bearing the nominal grade \u201cKovar.\u201d They need batch-tested 4J29 traceable to its heat number, together with practical recommendations for pretreatment before sealing. DZX supplies batch chemistry and measured linear expansion reports, along with wet-hydrogen annealing windows, surface acceptance criteria and trial-sealing recommendations, helping customers keep post-sealing leak-test results within acceptance limits. <\/p>\n<\/div>\n<section class=\"dc-case-facts\" aria-label=\"Project details\">\n<div class=\"dc-row dc-py-md-3 dc-justify-content-center\">\n<div class=\"dc-col-md-10\">\n<div class=\"dc-card-box\">\n<p class=\"dc-mb-2\"> This case summarizes the application requirements, materials supplied by DZX and delivery value. For case-specific technical data, please contact our engineering team. <\/p>\n<div class=\"dc-table-wrap\">\n<div class=\"dc-table-responsive\" role=\"region\" aria-label=\"Case study data table\" tabindex=\"0\">\n<table class=\"dc-table dc-table-striped dc-ke-zeroborder\">\n<tbody>\n<tr>\n<th scope=\"row\"> Client Profile <\/th>\n<td> Manufacturer of glass-to-metal seals for vacuum devices (relay and sensor housings) <\/td>\n<\/tr>\n<tr>\n<th scope=\"row\"> Application <\/th>\n<td> Hermetic metal-to-glass seals: leads, housings, sealing posts and baseplates <\/td>\n<\/tr>\n<tr>\n<th scope=\"row\"> Materials Supplied <\/th>\n<td> 4J29 Kovar alloy (29\u041d\u041a type) <\/td>\n<\/tr>\n<tr>\n<th scope=\"row\"> Supply Forms <\/th>\n<td> Strip, wire, bar and plate <\/td>\n<\/tr>\n<tr>\n<th scope=\"row\"> Key Requirements <\/th>\n<td> Batch thermal expansion matched to the sealing glass; stable chemistry (C\/S\/P control); consistent annealed surface condition <\/td>\n<\/tr>\n<tr>\n<th scope=\"row\"> Delivery Arrangement <\/th>\n<td> Standard sizes stocked; custom sizes confirmed against the production schedule, with material certificates supplied <\/td>\n<\/tr>\n<tr>\n<th scope=\"row\"> Project Region <\/th>\n<td> East China <\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/section>\n<\/div>\n<\/div>\n<div class=\"dc-content-bg\">\n<div class=\"dc-content\">\n<h2 class=\"dc-about-h2\"> Our Solution <\/h2>\n<div class=\"dc-row dc-py-md-3 dc-justify-content-center\">\n<div class=\"dc-col-md-10\">\n<div class=\"dc-card-box\">\n<p class=\"dc-mb-2\"> The sealing manufacturer&#8217;s bottleneck was not the grade itself, but three requirements that had not previously been met together in the same batch: <\/p>\n<ul class=\"dc-discitem1 dc-mb-0\">\n<li><strong> Measured thermal expansion for each batch<\/strong>: the sealing match depends on mean linear expansion over 20-100\u2103 and 20-300\u2103. After a batch change, measured values from the same heat must be available. Relying on the nominal grade alone can result in correct material identification but leaking seals. <\/li>\n<li><strong> Controlled chemistry and impurities<\/strong>: elevated C, S and P can leave bubbles and poor wetting at the sealing interface. These elements need control during melting and annealing, supported by batch reports. <\/li>\n<li><strong> Consistent annealed surface condition<\/strong>: the wet-hydrogen atmosphere and dew point determine whether glass spreads and wets the surface. Surface condition must be agreed at handover, rather than guessed retrospectively after trial sealing. <\/li>\n<\/ul>\n<\/div>\n<\/div>\n<\/div>\n<div class=\"dc-row dc-py-md-3 dc-justify-content-center\">\n<div class=\"dc-col-md-10\">\n<div class=\"dc-sol-card\">\n<div class=\"dc-row dc-align-items-center dc-pt-md-3 dc-media-stack\">\n<div class=\"dc-col-md-4\">\n<div class=\"dc-left-pic dc-left-pic-h\">\n<div class=\"dc-left-pics\">\n<figure><img alt=\"4J29 Kovar alloy wire supplied by Jiangsu DZX for glass-sealing leads\" src=\"https:\/\/www.dzx-metal.com\/products\/1-15-expansion-alloy_02.webp\" loading=\"lazy\" title=\"4J29 Kovar alloy wire supplied by Jiangsu DZX for glass-sealing leads\" decoding=\"async\"><\/figure>\n<\/div>\n<\/div>\n<\/div>\n<div class=\"dc-col-md-8\">\n<p class=\"dc-mb-2\"> DZX fixes three supply parameters: grade + specification + condition: <\/p>\n<p class=\"dc-mb-2\"> Each batch includes a chemistry report and measured linear expansion values, separately stated for 20-100\u2103 \/ 20-300\u2103 \/ 20-500\u2103 and linked to the heat number. Wet-hydrogen annealing temperature and dew-point windows are recommended according to the customer&#8217;s sealing-glass softening temperature. Incoming surface acceptance and retesting criteria are agreed, with trial sealing performed before bulk production. <\/p>\n<div class=\"dc-table-wrap\">\n<div class=\"dc-table-responsive\" role=\"region\" aria-label=\"Case study data table\" tabindex=\"0\">\n<table class=\"dc-table dc-table-striped dc-ke-zeroborder\">\n<thead>\n<tr>\n<th scope=\"col\"> Stage <\/th>\n<th scope=\"col\"> Specific Measures <\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td> Batch testing <\/td>\n<td> Chemistry report + measured linear expansion (three temperature ranges), traceable to the batch heat number <\/td>\n<\/tr>\n<tr>\n<td> Matching product form to the component <\/td>\n<td> Wire for leads and sealing posts; strip\/plate for housings and baseplates; bar for cylindrical components; cutting and slitting to drawing available <\/td>\n<\/tr>\n<tr>\n<td> Process support <\/td>\n<td> Recommended wet-hydrogen annealing temperature and dew-point windows; surface acceptance criteria <\/td>\n<\/tr>\n<tr>\n<td> Batch management <\/td>\n<td> Specify grade + specification + condition in the contract; review reports before batch changes and perform small-sample trial sealing when needed <\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n<p class=\"dc-mb-0 dc-mt-2\"><a href=\"https:\/\/dzxmetals.com\/product\/4j29-kovar-expansion-alloy\/\"> View 4J29 Kovar Alloy \u2192 <\/a> &nbsp;|&nbsp; <a href=\"https:\/\/dzxmetals.com\/product\/#Expansion-Alloys\"> View Expansion Alloys \u2192 <\/a><\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<div class=\"dc-row dc-py-md-2 dc-justify-content-center\">\n<div class=\"dc-col-md-10\">\n<div class=\"dc-gs-pics\">\n<figure><img alt=\"4J29 Kovar alloy wire for glass-sealing leads\" src=\"https:\/\/www.dzx-metal.com\/products\/1-15-expansion-alloy_02.webp\" loading=\"lazy\" title=\"4J29 Kovar alloy wire for glass-sealing leads\" decoding=\"async\"><figcaption> 4J29 wire, \u03c60.03-6mm <br \/> Sealing leads and posts <\/figcaption><\/figure>\n<figure><img alt=\"4J29 Kovar alloy strip for sealing housings and baseplates\" src=\"https:\/\/www.dzx-metal.com\/products\/1-15-expansion-alloy_05.webp\" loading=\"lazy\" title=\"4J29 Kovar alloy strip for sealing housings and baseplates\" decoding=\"async\"><figcaption> 4J29 strip, thickness 0.02-1mm <br \/> Housings, baseplates and stampings <\/figcaption><\/figure>\n<figure><img alt=\"4J29 Kovar alloy bar for machined sealing components\" src=\"https:\/\/www.dzx-metal.com\/products\/1-15-expansion-alloy_08.webp\" loading=\"lazy\" title=\"4J29 Kovar alloy bar for machined sealing components\" decoding=\"async\"><figcaption> 4J29 bar, \u03c63-100mm <br \/> Machined sealing components and electrodes <\/figcaption><\/figure>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<div class=\"dc-content-bg\">\n<div class=\"dc-content\">\n<h2 class=\"dc-about-h2\"> Technical Specifications <\/h2>\n<div class=\"dc-row dc-py-md-3 dc-justify-content-center\">\n<div class=\"dc-col-md-10\">\n<div class=\"dc-card-box\">\n<p class=\"dc-mb-2\"> Chemical composition (mass fraction, %): <\/p>\n<div class=\"dc-table-wrap\">\n<div class=\"dc-table-responsive\" role=\"region\" aria-label=\"Case study data table\" tabindex=\"0\">\n<table class=\"dc-table dc-table-striped dc-ke-zeroborder\">\n<thead>\n<tr>\n<th scope=\"col\"> Element <\/th>\n<th scope=\"col\">4J29 (29\u041d\u041a)<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td> Nickel (Ni) <\/td>\n<td>28.5-29.5<\/td>\n<\/tr>\n<tr>\n<td> Cobalt (Co) <\/td>\n<td>16.8-17.8<\/td>\n<\/tr>\n<tr>\n<td> Manganese (Mn) <\/td>\n<td>\u22640.50<\/td>\n<\/tr>\n<tr>\n<td> Silicon (Si) <\/td>\n<td>\u22640.30<\/td>\n<\/tr>\n<tr>\n<td> Carbon (C) <\/td>\n<td>\u22640.03<\/td>\n<\/tr>\n<tr>\n<td> Sulfur (S) <\/td>\n<td>\u22640.02<\/td>\n<\/tr>\n<tr>\n<td> Phosphorus (P) <\/td>\n<td>\u22640.02<\/td>\n<\/tr>\n<tr>\n<td> Iron (Fe) <\/td>\n<td> Balance <\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n<p class=\"dc-mb-2 dc-mt-3\"> Mean linear expansion coefficient (a key parameter for matching seals to hard glass and ceramics): <\/p>\n<div class=\"dc-table-wrap\">\n<div class=\"dc-table-responsive\" role=\"region\" aria-label=\"Case study data table\" tabindex=\"0\">\n<table class=\"dc-table dc-table-striped dc-ke-zeroborder\">\n<thead>\n<tr>\n<th scope=\"col\"> Temperature Range <\/th>\n<th scope=\"col\"> Mean Value <\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>20-100\u2103<\/td>\n<td>4.6 \u00d7 10\u207b\u2076\/\u2103<\/td>\n<\/tr>\n<tr>\n<td>20-300\u2103<\/td>\n<td>5.5 \u00d7 10\u207b\u2076\/\u2103<\/td>\n<\/tr>\n<tr>\n<td>20-500\u2103<\/td>\n<td>6.2 \u00d7 10\u207b\u2076\/\u2103<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<div class=\"dc-row dc-py-md-3 dc-justify-content-center\">\n<div class=\"dc-col-md-10\">\n<div class=\"dc-card-box\">\n<p class=\"dc-mb-2\"> Common supply specifications: <\/p>\n<div class=\"dc-table-wrap\">\n<div class=\"dc-table-responsive\" role=\"region\" aria-label=\"Case study data table\" tabindex=\"0\">\n<table class=\"dc-table dc-table-striped dc-ke-zeroborder\">\n<thead>\n<tr>\n<th scope=\"col\"> Form <\/th>\n<th scope=\"col\"> Size Range <\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td> Strip <\/td>\n<td> Thickness 0.02-1mm \u00d7 width 3-500mm <\/td>\n<\/tr>\n<tr>\n<td> Wire <\/td>\n<td>\u03c60.03-6mm<\/td>\n<\/tr>\n<tr>\n<td> Bar <\/td>\n<td>\u03c63-100mm<\/td>\n<\/tr>\n<tr>\n<td> Plate <\/td>\n<td> Thickness 0.1-20mm <\/td>\n<\/tr>\n<tr>\n<td> Delivery Condition <\/td>\n<td> Bright cold-rolled \/ annealed; cutting and slitting to size available <\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<div class=\"dc-content-bg\">\n<div class=\"dc-content\">\n<h2 class=\"dc-about-h2\"> Delivery and Quality Support <\/h2>\n<div class=\"dc-row dc-py-md-3 dc-justify-content-center\">\n<div class=\"dc-col-md-10\">\n<div class=\"dc-card-box\">\n<ul class=\"dc-discitem1 dc-mb-0\">\n<li><strong> Supplied documentation<\/strong>: material certificate (chemistry + dimensional report) and heat traceability; measured linear expansion report added when required. <\/li>\n<li><strong> First articles and trial sealing<\/strong>: small-sample trial sealing is recommended to confirm the matching window before bulk sealing. Trial material can be arranged in minimum batches. <\/li>\n<li><strong> Quality traceability<\/strong>: if abnormal leak-test results occur, chemistry and expansion data are traced by batch number to help determine whether the cause lies in the material, annealing or sealing process. <\/li>\n<li><strong> Engineering contact<\/strong>: questions about sealing windows, leak-test methods and surface treatment can be discussed directly with the engineering team without multiple intermediaries. <\/li>\n<\/ul>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<div class=\"dc-content-bg\">\n<div class=\"dc-content\">\n<h2 class=\"dc-about-h2\"> Customer Feedback <\/h2>\n<div class=\"dc-row dc-py-md-3 dc-justify-content-center\">\n<div class=\"dc-col-md-10\">\n<div class=\"dc-card-box\">\n<p class=\"dc-mb-2\"> Following trial sealing and the first production batch, feedback focused on the following: <\/p>\n<ul class=\"dc-discitem1 dc-mb-0\">\n<li><strong> Batch data supplied with the material<\/strong>: chemistry reports and measured expansion values for all three temperature ranges arrive together, avoiding the need to infer batch properties from trial seals. <\/li>\n<li><strong> Practical annealing windows<\/strong>: wet-hydrogen annealing temperature and dew-point recommendations matched to the glass softening temperature can be applied directly to the customer&#8217;s furnace settings. <\/li>\n<li><strong> Clear surface acceptance<\/strong>: the annealed surface description is included in the handover checklist, establishing whether oxidation colors are acceptable or require retesting at delivery. <\/li>\n<li><strong> Trial sealing before batch changes<\/strong>: small trial batches allow matching to be verified before bulk material enters production. <\/li>\n<li><strong> Heat-number traceability<\/strong>: chemistry and expansion records can be traced by batch number after abnormal leak tests, making it easier to distinguish material, annealing and sealing issues. <\/li>\n<li><strong> Sizes that support product development<\/strong>: strip, wire, bar and plate are available for small-batch trials, with cutting and slitting to drawings. <\/li>\n<\/ul>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<div class=\"dc-content-bg\">\n<div class=\"dc-content\">\n<h2 class=\"dc-about-h2\"> Our Capabilities <\/h2>\n<div class=\"dc-row dc-py-md-3 dc-justify-content-center\">\n<div class=\"dc-col-md-10\">\n<div class=\"dc-card-box\">\n<p> Jiangsu DZX Technology Co., Ltd., based in Changzhou, operates a self-owned factory of 12000+ square meters with melting, rolling, wire drawing and finishing lines. Its core team has specialized in precision alloys since 2002 and has served 1500+ business customers. Products undergo incoming, in-process and final inspection under the ISO9001 system. Bring drawings or operating parameters to discuss expansion-alloy delivery condition, tolerances and sealing-anneal recommendations directly with our team. <\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<div class=\"dc-content-bg\">\n<div class=\"dc-content\">\n<h2 class=\"dc-about-h2\"> Related Products <\/h2>\n<div class=\"dc-row dc-py-md-3 dc-justify-content-center\">\n<div class=\"dc-col-md-10\">\n<div class=\"dc-row\">\n<div class=\"dc-col-md-6 dc-col-lg-6 dc-mb-3\">\n<div class=\"dc-app-card\">\n<h3> 4J29 Kovar Alloy <\/h3>\n<p> Chemistry, linear expansion and size specifications for strip \/ wire \/ bar \/ plate <\/p>\n<p><a class=\"dc-more\" href=\"https:\/\/dzxmetals.com\/product\/4j29-kovar-expansion-alloy\/\"> View Product \u2192 <\/a><\/p>\n<\/div>\n<\/div>\n<div class=\"dc-col-md-6 dc-col-lg-6 dc-mb-3\">\n<div class=\"dc-app-card\">\n<h3> Precision Expansion Alloys (Controlled-Expansion Alloys) <\/h3>\n<p> 4J36 Invar \/ 4J29 Kovar comparison and low-expansion material selection <\/p>\n<p><a class=\"dc-more\" href=\"https:\/\/dzxmetals.com\/product\/#Expansion-Alloys\"> View Product \u2192 <\/a><\/p>\n<\/div>\n<\/div>\n<div class=\"dc-col-md-6 dc-col-lg-6 dc-mb-3\">\n<div class=\"dc-app-card\">\n<h3> Electronics Applications <\/h3>\n<p> Precision alloys for component packaging, leads, sensors and magnetic shielding <\/p>\n<p><a class=\"dc-more\" href=\"https:\/\/dzxmetals.com\/category\/applications\/electronics-semiconductors\/\"> View Application \u2192 <\/a><\/p>\n<\/div>\n<\/div>\n<div class=\"dc-col-md-6 dc-col-lg-6 dc-mb-3\">\n<div class=\"dc-app-card\">\n<h3> Precision Instrument Applications <\/h3>\n<p> Soft magnetic, expansion and thermocouple alloy solutions for instrumentation <\/p>\n<p><a class=\"dc-more\" href=\"https:\/\/dzxmetals.com\/category\/applications\/precision-instruments\/\"> View Application \u2192 <\/a><\/p>\n<\/div>\n<\/div>\n<\/div>\n<p class=\"dc-mb-0 dc-mt-2\"> Further reading: <a href=\"https:\/\/www.dzx-metal.com\/news-invar-kovar-selection-guide.html\" target=\"_blank\" rel=\"noopener\"> Invar and Kovar Low-Expansion Alloy Selection Guide \u2192 <\/a><\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<div class=\"dc-content-bg dc-faq-sec\">\n<div class=\"dc-content\">\n<h2 class=\"dc-about-h2\"> Frequently Asked Questions <\/h2>\n<div class=\"dc-row dc-py-md-3 dc-justify-content-center\">\n<div class=\"dc-col-md-10\">\n<div class=\"dc-card-box\">\n<div class=\"dc-accordion\" itemscope=\"\" itemtype=\"https:\/\/schema.org\/FAQPage\">\n<details class=\"dc-faq\" itemscope=\"\" itemprop=\"mainEntity\" itemtype=\"https:\/\/schema.org\/Question\">\n<summary>\n<h3 itemprop=\"name\"> How should 4J29 and 4J36 be used differently? <\/h3>\n<\/summary>\n<div class=\"dc-faq-answer\" itemscope=\"\" itemprop=\"acceptedAnswer\" itemtype=\"https:\/\/schema.org\/Answer\">\n<div itemprop=\"text\"> They serve different functions. 4J29 (Kovar) is a sealing alloy with a mean linear expansion coefficient of about 4.6\u00d710\u207b\u2076\/\u2103 over 20-100\u2103, used for metal-to-glass seals matched to hard glass and ceramics. 4J36 (Invar) is a low-expansion alloy, about 1.2-1.5\u00d710\u207b\u2076\/\u2103 over 20-100\u2103, for metrology and optical structures that require minimal dimensional change with temperature. Using 4J36 for sealing produces an expansion mismatch; treating 4J29 as a purely low-expansion material overlooks its expansion of 5.5\u00d710\u207b\u2076\/\u2103 over 20-300\u2103. <\/div>\n<\/div>\n<\/details>\n<details class=\"dc-faq\" itemscope=\"\" itemprop=\"mainEntity\" itemtype=\"https:\/\/schema.org\/Question\">\n<summary>\n<h3 itemprop=\"name\"> Why is wet-hydrogen annealing emphasized before sealing? <\/h3>\n<\/summary>\n<div class=\"dc-faq-answer\" itemscope=\"\" itemprop=\"acceptedAnswer\" itemtype=\"https:\/\/schema.org\/Answer\">\n<div itemprop=\"text\"> Rolling, drawing and machining can leave oxides and carbides on Kovar surfaces. Direct sealing can cause poor wetting, bubbles and microleaks. Wet-hydrogen annealing reduces surface oxides, lowers carbon content and relieves processing stress. Furnace dew point, temperature and holding time must be matched to the subsequent glass softening temperature. The supplier and sealing manufacturer should agree this window before trial sealing. <\/div>\n<\/div>\n<\/details>\n<details class=\"dc-faq\" itemscope=\"\" itemprop=\"mainEntity\" itemtype=\"https:\/\/schema.org\/Question\">\n<summary>\n<h3 itemprop=\"name\"> Does surface oxidation color always mean rejection? <\/h3>\n<\/summary>\n<div class=\"dc-faq-answer\" itemscope=\"\" itemprop=\"acceptedAnswer\" itemtype=\"https:\/\/schema.org\/Answer\">\n<div itemprop=\"text\"> No, but the cause needs assessment. A slight, uniform pale color usually does not affect sealing. Blue-purple colors or localized color differences often indicate a deviation in annealing atmosphere or dew point, or moisture exposure during storage. Such material should be retested before use. We provide an annealed surface description for each batch and, where needed, spectrometric or metallographic retesting. <\/div>\n<\/div>\n<\/details>\n<details class=\"dc-faq\" itemscope=\"\" itemprop=\"mainEntity\" itemtype=\"https:\/\/schema.org\/Question\">\n<summary>\n<h3 itemprop=\"name\"> Can expansion be measured and reported for each batch? <\/h3>\n<\/summary>\n<div class=\"dc-faq-answer\" itemscope=\"\" itemprop=\"acceptedAnswer\" itemtype=\"https:\/\/schema.org\/Answer\">\n<div itemprop=\"text\"> Yes. Batch chemistry reports are supplied for 4J29, and measured linear expansion can be agreed: mean values are separately reported for 20-100\u2103, 20-300\u2103 and 20-500\u2103, with the heat number for traceability. For critical seals, retain samples from the same batch for later trial sealing and comparison. <\/div>\n<\/div>\n<\/details>\n<details class=\"dc-faq\" itemscope=\"\" itemprop=\"mainEntity\" itemtype=\"https:\/\/schema.org\/Question\">\n<summary>\n<h3 itemprop=\"name\"> How are minimum order quantities, sampling lead times and acceptance arranged? <\/h3>\n<\/summary>\n<div class=\"dc-faq-answer\" itemscope=\"\" itemprop=\"acceptedAnswer\" itemtype=\"https:\/\/schema.org\/Answer\">\n<div itemprop=\"text\"> Small trial batches are available. Minimum quantities are confirmed individually by grade and form (strip, wire, bar or plate). For sealing components, small-sample trial sealing should first verify the matching window before bulk production. Sampling typically takes one to two weeks, depending on melting and rolling schedules. Standard acceptance documentation includes a material certificate (chemistry + dimensional report) and heat traceability; third-party testing or incoming sample inspection can also be agreed, with expansion testing added if required. For pricing and delivery, please <a href=\"https:\/\/dzxmetals.com\/contact-us\/\"> contact the manufacturer <\/a> for a quotation based on the actual specifications. <\/div>\n<\/div>\n<\/details>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<div class=\"dc-content-bg\">\n<div class=\"dc-content\">\n<h2 class=\"dc-about-h2\"> More Successful Cases <\/h2>\n<div class=\"dc-row dc-py-md-3 dc-justify-content-center\">\n<div class=\"dc-col-md-10\">\n<div class=\"dc-row\">\n<div class=\"dc-col-md-6 dc-col-lg-6 dc-mb-3\">\n<div class=\"dc-app-card\">\n<h3> Structural Materials for Precision Instruments <\/h3>\n<p> Invar36 strip and plate with measured CTE for optical platforms <\/p>\n<p><a class=\"dc-more\" href=\"https:\/\/dzxmetals.com\/case-precision-instruments\/\"> View Case \u2192 <\/a><\/p>\n<\/div>\n<\/div>\n<div class=\"dc-col-md-6 dc-col-lg-6 dc-mb-3\">\n<div class=\"dc-app-card\">\n<h3> Precision Resistor and Magnetic Core Materials <\/h3>\n<p> TCR-controlled strip and soft magnetic 1J79 for electronic components <\/p>\n<p><a class=\"dc-more\" href=\"https:\/\/dzxmetals.com\/case-electronics\/\"> View Case \u2192 <\/a><\/p>\n<\/div>\n<\/div>\n<div class=\"dc-col-md-6 dc-col-lg-6 dc-mb-3\">\n<div class=\"dc-app-card\">\n<h3> Temperature Measurement Materials for Power Plants <\/h3>\n<p> Matched thermocouples and compensation wire; acceptance by sheathed construction and tolerance class <\/p>\n<p><a class=\"dc-more\" href=\"https:\/\/dzxmetals.com\/case-power-plant-temperature\/\"> View Case \u2192 <\/a><\/p>\n<\/div>\n<\/div>\n<div class=\"dc-col-md-6 dc-col-lg-6 dc-mb-3\">\n<div class=\"dc-app-card\">\n<h3> Boiler Superheater Replacement <\/h3>\n<p> On-time delivery of TP304H \/ TP347H and Incoloy 800H tubes <\/p>\n<p><a class=\"dc-more\" href=\"https:\/\/dzxmetals.com\/case-energy-industry\/\"> View Case \u2192 <\/a><\/p>\n<\/div>\n<\/div>\n<\/div>\n<p class=\"dc-mb-0 dc-mt-2\"><a href=\"https:\/\/dzxmetals.com\/category\/case-studies\/\"> View All Successful Cases \u2192 <\/a><\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<div class=\"dc-content-bg dc-ref-sec\">\n<div class=\"dc-content\">\n<div class=\"dc-content-box3\">\n<h2 class=\"dc-about-h2\"> References <\/h2>\n<\/div>\n<div class=\"dc-row dc-py-md-3 dc-justify-content-center\">\n<div class=\"dc-col-lg-10\">\n<div class=\"dc-ref-card\">\n<ol class=\"dc-ref-list\">\n<li><span class=\"dc-ref-name\"> GB\/T 15018-1994: Designations of Precision Alloys <\/span><span class=\"dc-ref-desc\"> Defines designations and naming methods for precision alloys, including expansion alloys such as 4J36 and 4J29; the national standard governing grade designations. <\/span><a class=\"dc-ref-link\" href=\"https:\/\/openstd.samr.gov.cn\/bzgk\/std\/std_list?p.p1=0&amp;p.p90=circulation_date&amp;p.p91=desc&amp;p.p2=GB%2FT%2015018\" target=\"_blank\" rel=\"nofollow noopener\"> View Source <\/a><\/li>\n<li><span class=\"dc-ref-name\"> GB\/T 14985-2007: General Requirements for Dimensions, Shape, Surface Quality, Test Methods and Inspection Rules of Expansion Alloys <\/span><span class=\"dc-ref-desc\"> Defines dimensions, shape, surface quality, test methods and inspection rules for expansion-alloy products, providing a direct basis for incoming acceptance. <\/span><a class=\"dc-ref-link\" href=\"https:\/\/openstd.samr.gov.cn\/bzgk\/std\/std_list?p.p1=0&amp;p.p90=circulation_date&amp;p.p91=desc&amp;p.p2=GB%2FT%2014985\" target=\"_blank\" rel=\"nofollow noopener\"> View Source <\/a><\/li>\n<li><span class=\"dc-ref-name\">ASTM F15-04(2022)\u201cStandard Specification for Iron-Nickel-Cobalt Sealing Alloy\u201d<\/span><span class=\"dc-ref-desc\"> Covers UNS K94610 (approximately 29%Ni-17%Co-53%Fe, i.e. 4J29\/Kovar) wire, bar, strip, plate and tube for glass sealing. Note: this standard was withdrawn in 2024 without replacement. <\/span><a class=\"dc-ref-link\" href=\"https:\/\/store.astm.org\/f0015-04r22.html\" target=\"_blank\" rel=\"nofollow noopener\"> View Source <\/a><\/li>\n<li><span class=\"dc-ref-name\">ASTM F1684-06(2021)\u201cStandard Specification for Iron-Nickel and Iron-Nickel-Cobalt Alloys for Low Thermal Expansion Applications\u201d<\/span><span class=\"dc-ref-desc\"> Covers Fe-Ni and Fe-Ni-Co alloys for low thermal expansion, specifying chemistry, grain size and thermal expansion requirements. Note: withdrawn in 2024 without replacement. <\/span><a class=\"dc-ref-link\" href=\"https:\/\/store.astm.org\/f1684-06r21.html\" target=\"_blank\" rel=\"nofollow noopener\"> View Source <\/a><\/li>\n<li><span class=\"dc-ref-name\">ASM Handbook, Vol. 2: Properties and Selection: Nonferrous Alloys and Special-Purpose Materials<\/span><span class=\"dc-ref-desc\"> An authoritative handbook containing chemistry, physical properties and thermal expansion data for low-expansion and sealing alloys, including Kovar and Invar. <\/span><a class=\"dc-ref-link\" href=\"https:\/\/dl.asminternational.org\/handbooks\/edited-volume\/14\" target=\"_blank\" rel=\"nofollow noopener\"> View Source <\/a><\/li>\n<\/ol>\n<div class=\"dc-ref-note\"> Data basis: chemistry and linear expansion values in this case come from Jiangsu DZX Technology Co., Ltd.&#8217;s 4J29 product specifications and batch quality reports. Standard information is cited from the public standards and handbook listed above. Measured values vary normally between heats; critical sealing performance is governed by the delivered material certificate and trial-sealing results. <\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<aside class=\"dc-bottom-quote\">\n<div class=\"dc-content\">\n<div class=\"dc-quote-text\">\n<div class=\"dc-quote-title\"> Looking for Reliable Alloy Materials? Get a Manufacturer&#8217;s Quote <\/div>\n<p><span> We provide customized alloy solutions to meet your demanding technical specifications. <\/span> <\/div>\n<p><a class=\"dc-bottom-inquiry\" href=\"https:\/\/dzxmetals.com\/contact-us\/\"> <span> Contact Us <\/span> <\/a><\/p>\n<\/div>\n<\/aside>\n<\/article>\n","protected":false},"excerpt":{"rendered":"<p>Un fabricante de sellos de vidrio a metal que suministra rel\u00e9s de vac\u00edo y sensores de presi\u00f3n se top\u00f3 con un problema recurrente durante las pruebas de fugas de helio de un nuevo producto: algunos sellos fabricados con el mismo lote de cables 4J29 superaron las pruebas de fugas, mientras que otros desarrollaron microfugas despu\u00e9s de ciclos t\u00e9rmicos. El equipo verific\u00f3 los par\u00e1metros del proceso; el perfil de temperatura, el flujo de hidr\u00f3geno y los accesorios permanecieron sin cambios. Solo despu\u00e9s de devolver el material restante al proveedor para realizar nuevas pruebas qu\u00edmicas y de expansi\u00f3n t\u00e9rmica se descubri\u00f3 la causa: despu\u00e9s de un cambio de lote, la curva de expansi\u00f3n del nuevo material se hab\u00eda desplazado fuera del rango de compatibilidad del vidrio de sellado.<\/p>","protected":false},"author":1,"featured_media":2778,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"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":"default","ast-page-background-enabled":"default","ast-page-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":"","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-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":"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":""},"mobile":{"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":""}},"footnotes":""},"categories":[1027],"tags":[1028],"class_list":["post-4497","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-case-studies","tag-vacuum-electronicschina"],"acf":[],"_links":{"self":[{"href":"https:\/\/dzxmetals.com\/es\/wp-json\/wp\/v2\/posts\/4497","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/dzxmetals.com\/es\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/dzxmetals.com\/es\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/dzxmetals.com\/es\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/dzxmetals.com\/es\/wp-json\/wp\/v2\/comments?post=4497"}],"version-history":[{"count":0,"href":"https:\/\/dzxmetals.com\/es\/wp-json\/wp\/v2\/posts\/4497\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/dzxmetals.com\/es\/wp-json\/wp\/v2\/media\/2778"}],"wp:attachment":[{"href":"https:\/\/dzxmetals.com\/es\/wp-json\/wp\/v2\/media?parent=4497"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/dzxmetals.com\/es\/wp-json\/wp\/v2\/categories?post=4497"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/dzxmetals.com\/es\/wp-json\/wp\/v2\/tags?post=4497"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}