{"id":1051226,"date":"2026-04-16T17:53:33","date_gmt":"2026-04-16T09:53:33","guid":{"rendered":"https:\/\/vimaterial.de\/?p=1051226"},"modified":"2026-04-16T17:58:44","modified_gmt":"2026-04-16T09:58:44","slug":"high-purity-alumina-hpa","status":"publish","type":"post","link":"https:\/\/vimaterial.de\/en\/high-purity-alumina-hpa\/","title":{"rendered":"High Purity Alumina (HPA): Properties, Production, and Applications"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"1051226\" class=\"elementor elementor-1051226\" data-elementor-post-type=\"post\">\n\t\t\t\t<div class=\"elementor-element elementor-element-7686a8c e-flex e-con-boxed e-con e-parent\" data-id=\"7686a8c\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-0240700 elementor-widget elementor-widget-text-editor\" data-id=\"0240700\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>High purity alumina (HPA) powder exhibits exceptional optical, electrical, magnetic, thermal, and mechanical properties that far surpass those of conventional alumina. It is a critical advanced material widely used in aerospace, semiconductors, nuclear energy, new energy, metallurgy, biomedicine, lighting, machinery, and chemical industries. Today, HPA is considered one of the most valuable and versatile high-end materials in modern chemical engineering.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-1bcfbce elementor-widget elementor-widget-heading\" data-id=\"1bcfbce\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">I. What is High Purity Alumina?<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-59cf4b7 elementor-widget elementor-widget-text-editor\" data-id=\"59cf4b7\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>High purity <span style=\"color: #0000ff;\"><a style=\"color: #0000ff;\" href=\"https:\/\/vimaterial.de\/en\/product\/aluminum-oxide-powder\/\">alumina powder<\/a><\/span> is an inorganic, non-metallic material primarily composed of aluminum oxide (Al\u2082O\u2083). Its defining characteristic is its extremely high purity\u2014typically \u226599.99%. Using advanced processes such as atomization, it can be produced as ultra-fine spherical particles, with sizes ranging from micrometers down to nanometers (e.g., 1\u201350 nm for ultra-fine grades).<\/p><p>HPA mainly exists in two crystalline forms:<\/p><ul><li><strong>Alpha (\u03b1) phase:<\/strong> Thermodynamically stable, highly resistant to high temperatures, widely used in sapphire crystals and precision ceramics<\/li><li><strong>Gamma (\u03b3) phase:<\/strong> Metastable, porous, and highly reactive, suitable for catalytic and adsorption applications<\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-ec0c0b1 elementor-widget elementor-widget-text-editor\" data-id=\"ec0c0b1\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Due to its high hardness, high melting point, excellent chemical resistance, and outstanding thermal stability, HPA performs exceptionally well in thermal conductivity, electrical insulation, and wear resistance, making it indispensable in modern industry.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-c879794 elementor-widget elementor-widget-image\" data-id=\"c879794\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img fetchpriority=\"high\" decoding=\"async\" width=\"663\" height=\"500\" src=\"https:\/\/vimaterial.de\/wp-content\/uploads\/2026\/04\/High-purity-alumina-powder.jpg\" class=\"attachment-large size-large wp-image-1051233\" alt=\"\" srcset=\"https:\/\/vimaterial.de\/wp-content\/uploads\/2026\/04\/High-purity-alumina-powder.jpg 663w, https:\/\/vimaterial.de\/wp-content\/uploads\/2026\/04\/High-purity-alumina-powder-300x226.jpg 300w, https:\/\/vimaterial.de\/wp-content\/uploads\/2026\/04\/High-purity-alumina-powder-600x452.jpg 600w\" sizes=\"(max-width: 663px) 100vw, 663px\" title=\"\">\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-74824bc elementor-widget elementor-widget-heading\" data-id=\"74824bc\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">Key Properties of Ultra High Purity Alumina HPA<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-9ee2d65 elementor-widget elementor-widget-text-editor\" data-id=\"9ee2d65\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><strong>Ultra-high purity:<\/strong> Impurity levels (Na, Fe, Si, etc.) are controlled at the ppm level using processes such as sol-gel synthesis and chemical vapor deposition (CVD).<\/p><p><strong>High temperature resistance:<\/strong> <br \/>Melting point: ~2050\u00b0C<br \/>Continuous operating temperature: up to 1600\u00b0C<br \/>Short-term tolerance: up to 1800\u00b0C<\/p><p><strong>Excellent chemical stability:<\/strong> For example, after immersion in HCl (pH = 1) for 24 hours, mass loss is less than 0.01%, outperforming materials like zirconia (ZrO\u2082).<\/p><p><strong>Outstanding mechanical properties:<\/strong> Mohs hardness ~9 (second only to diamond), with high compressive and flexural strength.<\/p><p><strong>Superior electrical insulation:<\/strong> At 1 MHz, dielectric constant remains stable at 9.8\u201310.2, with a loss tangent below 0.0002.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-6d6b23e elementor-widget elementor-widget-heading\" data-id=\"6d6b23e\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">Key Parameters and Performance Relationships<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-c67a8f9 elementor-widget elementor-widget-text-editor\" data-id=\"c67a8f9\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>A purity level of \u226599.99% ensures chemical stability in high-temperature environments and prevents performance degradation caused by impurities.<\/p><p>Particle size distribution is also critical:<\/p><ul><li><strong>Micron-scale particles (~1 \u03bcm):<\/strong> Suitable for high-strength structural ceramics<\/li><li><strong>Nano-scale particles (~50 nm):<\/strong> Exhibit quantum effects and are ideal for advanced applications such as transparent ceramics and phosphor materials<\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-4e0d2f5 elementor-widget elementor-widget-text-editor\" data-id=\"4e0d2f5\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>For example, in LED packaging, nano-alumina enables both high optical transmittance (&gt;90%) and high thermal conductivity (&gt;10 W\/m\u00b7K), overcoming the traditional trade-off between transparency and heat dissipation.<\/p><p>Additionally, vacuum or sealed packaging prevents moisture absorption and agglomeration, extending storage life.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-ca2f827 elementor-widget elementor-widget-heading\" data-id=\"ca2f827\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">Phase-Based Product Series<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-bfee3e4 elementor-widget elementor-widget-text-editor\" data-id=\"bfee3e4\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><strong>Alpha (\u03b1) Phase Series<\/strong><\/p><p>As the stable high-temperature phase, \u03b1-alumina offers excellent hardness and wear resistance. It is widely used in ceramics, abrasives, aerospace, and automotive applications where extreme temperature resistance is required.<\/p><p><img decoding=\"async\" class=\"size-medium wp-image-1051228 aligncenter\" src=\"https:\/\/vimaterial.de\/wp-content\/uploads\/2026\/04\/\u03b1-High-purity-alumina-300x220.jpg\" alt=\"\u03b1-phase High purity alumina\" width=\"300\" height=\"220\" title=\"\" srcset=\"https:\/\/vimaterial.de\/wp-content\/uploads\/2026\/04\/\u03b1-High-purity-alumina-300x220.jpg 300w, https:\/\/vimaterial.de\/wp-content\/uploads\/2026\/04\/\u03b1-High-purity-alumina-600x439.jpg 600w, https:\/\/vimaterial.de\/wp-content\/uploads\/2026\/04\/\u03b1-High-purity-alumina.jpg 683w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/p><p><strong>Gamma (\u03b3) Phase Series<\/strong><\/p><p>As a transitional low-temperature phase, \u03b3-alumina features high porosity and surface area, making it ideal for catalyst supports and adsorbents. Its structure also enhances electrode rate capability and cycling stability, helping mitigate volume expansion and degradation during charge-discharge cycles.<\/p><p><img decoding=\"async\" class=\"size-medium wp-image-1051232 aligncenter\" src=\"https:\/\/vimaterial.de\/wp-content\/uploads\/2026\/04\/\u03b3-high-purity-alumina-300x223.jpg\" alt=\"\u03b3-phase high purity alumina\" width=\"300\" height=\"223\" title=\"\" srcset=\"https:\/\/vimaterial.de\/wp-content\/uploads\/2026\/04\/\u03b3-high-purity-alumina-300x223.jpg 300w, https:\/\/vimaterial.de\/wp-content\/uploads\/2026\/04\/\u03b3-high-purity-alumina-600x446.jpg 600w, https:\/\/vimaterial.de\/wp-content\/uploads\/2026\/04\/\u03b3-high-purity-alumina.jpg 673w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-9d8a4e1 elementor-widget elementor-widget-heading\" data-id=\"9d8a4e1\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">II. Production Technologies<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-09108bd elementor-widget elementor-widget-text-editor\" data-id=\"09108bd\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>HPA can be produced via various methods, including liquid-phase, gas-phase, and solid-phase processes.<\/p><p>Among them, the <strong>alkoxide hydrolysis method<\/strong> is becoming the preferred route for semiconductor-grade alumina due to its mild reaction conditions and high product purity, gradually replacing the traditional Bayer process.<\/p><p>In atomization processes, molten aluminum or precursor materials are dispersed into fine droplets using high-pressure gas and rapidly solidified into spherical particles. This morphology:<\/p><ul><li>Increases specific surface area (enhancing reactivity)<\/li><li>Reduces inter-particle friction<\/li><li>Improves dispersion in composite systems<\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-1c7e0a9 elementor-widget elementor-widget-text-editor\" data-id=\"1c7e0a9\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>For instance:<\/p><ul><li>In ceramics: lowers sintering temperature and improves density<\/li><li>In thermal materials: nano-sized particles fill micro-voids, forming continuous heat conduction networks and increasing thermal conductivity by over 30%<\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-98bd2f0 elementor-widget elementor-widget-heading\" data-id=\"98bd2f0\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">III. What's the Application Fields of High Purity Alumina<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-ac210c2 elementor-widget elementor-widget-text-editor\" data-id=\"ac210c2\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Thanks to its superior properties, <span style=\"color: #0000ff;\"><a style=\"color: #0000ff;\" href=\"https:\/\/vimaterial.de\/en\/search\/?type=element&amp;keyword=Al2O3\">HPA<\/a><\/span> is widely used in high-tech industries:<\/p><p><strong>Electronics &amp; Semiconductors<\/strong><\/p><ul><li>Sapphire substrates for LEDs<\/li><li>Gate dielectric layers in semiconductor chips<\/li><li>Passivation layers in 5G RF devices<\/li><\/ul><p><strong>New Energy<\/strong><\/p><ul><li>Lithium battery separator coatings<\/li><li>Solid electrolyte coatings (e.g., <span style=\"color: #0000ff;\"><a style=\"color: #0000ff;\" href=\"https:\/\/vimaterial.de\/en\/search\/?type=element&amp;keyword=LiCoO2\">LiCoO\u2082<\/a><\/span> cathode surface modification)<\/li><li><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-1051234 alignright\" src=\"https:\/\/vimaterial.de\/wp-content\/uploads\/2026\/04\/High-purity-alumina-ceramic-196x300.jpg\" alt=\"High purity alumina ceramic - VIMATERIAL\" width=\"196\" height=\"300\" title=\"\" srcset=\"https:\/\/vimaterial.de\/wp-content\/uploads\/2026\/04\/High-purity-alumina-ceramic-196x300.jpg 196w, https:\/\/vimaterial.de\/wp-content\/uploads\/2026\/04\/High-purity-alumina-ceramic.jpg 500w\" sizes=\"(max-width: 196px) 100vw, 196px\" \/><\/li><\/ul><p><strong>Optics &amp; Display<\/strong><\/p><ul><li>Transparent alumina ceramic tubes for high-pressure sodium lamps<\/li><li>Plasma display materials<\/li><li><span style=\"color: #0000ff;\"><a style=\"color: #0000ff;\" href=\"https:\/\/en.wikipedia.org\/wiki\/OLED\" rel=\"nofollow noopener\" target=\"_blank\">OLED<\/a><\/span> panels<\/li><\/ul><p><strong>Advanced Ceramics<\/strong><\/p><ul><li>High-strength alumina ceramics<\/li><li>Artificial joints and bone implants<\/li><li>Industrial cutting tool coatings<\/li><\/ul><p><strong>Other Fields<\/strong><\/p><ul><li>Catalyst supports<\/li><li>Precision polishing materials<\/li><li>Infrared absorption and heating materials<\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-6366989 elementor-widget elementor-widget-text-editor\" data-id=\"6366989\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>It is worth noting that purity requirements vary significantly by application. For example, electronic packaging requires \u226599.99% purity to prevent insulation failure, while general wear-resistant materials may only require ~99.5%.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-5f093e3 elementor-widget elementor-widget-heading\" data-id=\"5f093e3\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">IV. Safety Considerations\n<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-62415aa elementor-widget elementor-widget-text-editor\" data-id=\"62415aa\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>High purity alumina is generally safe, but two special cases require attention:<\/p><ul><li><strong>Nano-scale powders<\/strong> may pose a dust explosion risk when particle size is below 50 \u03bcm and airborne concentration exceeds 40 g\/m\u00b3<\/li><li><strong>Molten alumina<\/strong> may react violently with strong reducing agents (e.g., sodium metal)<\/li><\/ul><p>Proper ventilation and avoiding inhalation of ultra-fine powders are sufficient for safe handling.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-39efbb9 elementor-widget elementor-widget-heading\" data-id=\"39efbb9\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">Recommended Safety Practices<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-2c053f0 elementor-widget elementor-widget-text-editor\" data-id=\"2c053f0\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>For industrial applications:<\/p><ul><li>Particles &gt;100 \u03bcm can be handled directly<\/li><li>Wear N95 masks when handling fine powders<\/li><li>Maintain storage humidity below 60%<\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-4a16c95 elementor-widget elementor-widget-heading\" data-id=\"4a16c95\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">V. Conclusion<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-b401b94 elementor-widget elementor-widget-text-editor\" data-id=\"b401b94\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>As a key branch of advanced inorganic non-metallic materials, high purity alumina powder plays a vital role across multiple high-tech industries due to its outstanding physical and chemical properties.<\/p><p>With ongoing industrial advancement, demand for HPA is expected to grow in emerging applications such as:<\/p><ul><li><strong>Solid-state batteries:<\/strong> improving ionic conductivity by up to two orders of magnitude<\/li><li><strong>AI chip packaging:<\/strong> low dielectric constant powders (\u03b5 \u2248 8.5) help reduce signal interference<\/li><li><strong>Space-based 3D printing:<\/strong> in-situ fabrication of alumina structures on the Moon, offering up to 300% improved radiation resistance<\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-55bde1f elementor-widget elementor-widget-heading\" data-id=\"55bde1f\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Frequently Asked Questions about High purity Alumina<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-a22426d elementor-widget elementor-widget-n-accordion\" data-id=\"a22426d\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;default_state&quot;:&quot;expanded&quot;,&quot;max_items_expended&quot;:&quot;one&quot;,&quot;n_accordion_animation_duration&quot;:{&quot;unit&quot;:&quot;ms&quot;,&quot;size&quot;:400,&quot;sizes&quot;:[]}}\" data-widget_type=\"nested-accordion.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"e-n-accordion\" aria-label=\"Accordion. Open links with Enter or Space, close with Escape, and navigate with Arrow Keys\">\n\t\t\t\t\t\t<details id=\"e-n-accordion-item-1700\" class=\"e-n-accordion-item\" open>\n\t\t\t\t<summary class=\"e-n-accordion-item-title\" data-accordion-index=\"1\" tabindex=\"0\" aria-expanded=\"true\" aria-controls=\"e-n-accordion-item-1700\" >\n\t\t\t\t\t<span class='e-n-accordion-item-title-header'><div class=\"e-n-accordion-item-title-text\"> What is high purity alumina? <\/div><\/span>\n\t\t\t\t\t\t\t<span class='e-n-accordion-item-title-icon'>\n\t\t\t<span class='e-opened' ><svg aria-hidden=\"true\" class=\"e-font-icon-svg e-fas-minus\" viewBox=\"0 0 448 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M416 208H32c-17.67 0-32 14.33-32 32v32c0 17.67 14.33 32 32 32h384c17.67 0 32-14.33 32-32v-32c0-17.67-14.33-32-32-32z\"><\/path><\/svg><\/span>\n\t\t\t<span class='e-closed'><svg aria-hidden=\"true\" class=\"e-font-icon-svg e-fas-plus\" viewBox=\"0 0 448 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M416 208H272V64c0-17.67-14.33-32-32-32h-32c-17.67 0-32 14.33-32 32v144H32c-17.67 0-32 14.33-32 32v32c0 17.67 14.33 32 32 32h144v144c0 17.67 14.33 32 32 32h32c17.67 0 32-14.33 32-32V304h144c17.67 0 32-14.33 32-32v-32c0-17.67-14.33-32-32-32z\"><\/path><\/svg><\/span>\n\t\t<\/span>\n\n\t\t\t\t\t\t<\/summary>\n\t\t\t\t<div role=\"region\" aria-labelledby=\"e-n-accordion-item-1700\" class=\"elementor-element elementor-element-ee34733 e-con-full e-flex e-con e-child\" data-id=\"ee34733\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-8626d3d elementor-widget elementor-widget-text-editor\" data-id=\"8626d3d\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>High purity alumina (HPA) is a high-grade inorganic material mainly composed of aluminum oxide (Al\u2082O\u2083) with a purity of typically \u226599.99%. It can be produced as ultra-fine particles and exists mainly in \u03b1-phase (high-temperature stable) and \u03b3-phase (porous and active) forms. With its excellent hardness, thermal stability, chemical resistance, and electrical insulation, HPA is a key functional material widely used in advanced industrial applications.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/details>\n\t\t\t\t\t\t<details id=\"e-n-accordion-item-1701\" class=\"e-n-accordion-item\" >\n\t\t\t\t<summary class=\"e-n-accordion-item-title\" data-accordion-index=\"2\" tabindex=\"-1\" aria-expanded=\"false\" aria-controls=\"e-n-accordion-item-1701\" >\n\t\t\t\t\t<span class='e-n-accordion-item-title-header'><div class=\"e-n-accordion-item-title-text\"> What is the highest purity of alumina? <\/div><\/span>\n\t\t\t\t\t\t\t<span class='e-n-accordion-item-title-icon'>\n\t\t\t<span class='e-opened' ><svg aria-hidden=\"true\" class=\"e-font-icon-svg e-fas-minus\" viewBox=\"0 0 448 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M416 208H32c-17.67 0-32 14.33-32 32v32c0 17.67 14.33 32 32 32h384c17.67 0 32-14.33 32-32v-32c0-17.67-14.33-32-32-32z\"><\/path><\/svg><\/span>\n\t\t\t<span class='e-closed'><svg aria-hidden=\"true\" class=\"e-font-icon-svg e-fas-plus\" viewBox=\"0 0 448 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M416 208H272V64c0-17.67-14.33-32-32-32h-32c-17.67 0-32 14.33-32 32v144H32c-17.67 0-32 14.33-32 32v32c0 17.67 14.33 32 32 32h144v144c0 17.67 14.33 32 32 32h32c17.67 0 32-14.33 32-32V304h144c17.67 0 32-14.33 32-32v-32c0-17.67-14.33-32-32-32z\"><\/path><\/svg><\/span>\n\t\t<\/span>\n\n\t\t\t\t\t\t<\/summary>\n\t\t\t\t<div role=\"region\" aria-labelledby=\"e-n-accordion-item-1701\" class=\"elementor-element elementor-element-24aeee8 e-con-full e-flex e-con e-child\" data-id=\"24aeee8\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-9c72e93 elementor-widget elementor-widget-text-editor\" data-id=\"9c72e93\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>The highest purity of alumina (Al\u2082O\u2083) currently available typically reaches 5N level (99.999%). At this level, impurity elements such as sodium, iron, and silicon are reduced to extremely low concentrations (ppm or even ppb levels), ensuring outstanding chemical stability and electrical performance. Such ultra-high purity alumina is mainly used in demanding applications like semiconductors, sapphire crystal growth, and advanced electronic materials, where even trace impurities can significantly affect performance.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/details>\n\t\t\t\t\t\t<details id=\"e-n-accordion-item-1702\" class=\"e-n-accordion-item\" >\n\t\t\t\t<summary class=\"e-n-accordion-item-title\" data-accordion-index=\"3\" tabindex=\"-1\" aria-expanded=\"false\" aria-controls=\"e-n-accordion-item-1702\" >\n\t\t\t\t\t<span class='e-n-accordion-item-title-header'><div class=\"e-n-accordion-item-title-text\"> What is the purity of alumina? <\/div><\/span>\n\t\t\t\t\t\t\t<span class='e-n-accordion-item-title-icon'>\n\t\t\t<span class='e-opened' ><svg aria-hidden=\"true\" class=\"e-font-icon-svg e-fas-minus\" viewBox=\"0 0 448 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M416 208H32c-17.67 0-32 14.33-32 32v32c0 17.67 14.33 32 32 32h384c17.67 0 32-14.33 32-32v-32c0-17.67-14.33-32-32-32z\"><\/path><\/svg><\/span>\n\t\t\t<span class='e-closed'><svg aria-hidden=\"true\" class=\"e-font-icon-svg e-fas-plus\" viewBox=\"0 0 448 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M416 208H272V64c0-17.67-14.33-32-32-32h-32c-17.67 0-32 14.33-32 32v144H32c-17.67 0-32 14.33-32 32v32c0 17.67 14.33 32 32 32h144v144c0 17.67 14.33 32 32 32h32c17.67 0 32-14.33 32-32V304h144c17.67 0 32-14.33 32-32v-32c0-17.67-14.33-32-32-32z\"><\/path><\/svg><\/span>\n\t\t<\/span>\n\n\t\t\t\t\t\t<\/summary>\n\t\t\t\t<div role=\"region\" aria-labelledby=\"e-n-accordion-item-1702\" class=\"elementor-element elementor-element-67d9a58 e-con-full e-flex e-con e-child\" data-id=\"67d9a58\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-918692f elementor-widget elementor-widget-text-editor\" data-id=\"918692f\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Alumina (Al\u2082O\u2083) purity is typically classified using the \u201cN\u201d grading system, where \u201cN\u201d represents the number of nines in the purity percentage:<\/p><p><strong>3N (99.9%):<\/strong> Industrial-grade high-purity alumina, commonly used in ceramics and general applications<br \/><strong>4N (99.99%):<\/strong> Standard high purity, suitable for LEDs, lithium batteries, and electronic materials<br \/><strong>4N5 (99.995%):<\/strong> Higher-grade purity for more demanding electronic and optical applications<br \/><strong>5N (99.999%):<\/strong> Ultra-high purity, used in semiconductors, sapphire crystal growth, and advanced technologies<\/p><p>In general, higher purity means lower impurity content and better performance in high-end applications.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/details>\n\t\t\t\t\t\t<details id=\"e-n-accordion-item-1703\" class=\"e-n-accordion-item\" >\n\t\t\t\t<summary class=\"e-n-accordion-item-title\" data-accordion-index=\"4\" tabindex=\"-1\" aria-expanded=\"false\" aria-controls=\"e-n-accordion-item-1703\" >\n\t\t\t\t\t<span class='e-n-accordion-item-title-header'><div class=\"e-n-accordion-item-title-text\"> What material is HPA? <\/div><\/span>\n\t\t\t\t\t\t\t<span class='e-n-accordion-item-title-icon'>\n\t\t\t<span class='e-opened' ><svg aria-hidden=\"true\" class=\"e-font-icon-svg e-fas-minus\" viewBox=\"0 0 448 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M416 208H32c-17.67 0-32 14.33-32 32v32c0 17.67 14.33 32 32 32h384c17.67 0 32-14.33 32-32v-32c0-17.67-14.33-32-32-32z\"><\/path><\/svg><\/span>\n\t\t\t<span class='e-closed'><svg aria-hidden=\"true\" class=\"e-font-icon-svg e-fas-plus\" viewBox=\"0 0 448 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M416 208H272V64c0-17.67-14.33-32-32-32h-32c-17.67 0-32 14.33-32 32v144H32c-17.67 0-32 14.33-32 32v32c0 17.67 14.33 32 32 32h144v144c0 17.67 14.33 32 32 32h32c17.67 0 32-14.33 32-32V304h144c17.67 0 32-14.33 32-32v-32c0-17.67-14.33-32-32-32z\"><\/path><\/svg><\/span>\n\t\t<\/span>\n\n\t\t\t\t\t\t<\/summary>\n\t\t\t\t<div role=\"region\" aria-labelledby=\"e-n-accordion-item-1703\" class=\"elementor-element elementor-element-8cfb627 e-flex e-con-boxed e-con e-child\" data-id=\"8cfb627\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-18191db elementor-widget elementor-widget-text-editor\" data-id=\"18191db\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>HPA (High Purity Alumina) is an advanced inorganic material primarily composed of aluminum oxide (Al\u2082O\u2083) with a purity of typically 99.99% (4N) or higher. It is produced through refined processes to achieve extremely low impurity levels and is known for its excellent thermal stability, electrical insulation, high hardness, and chemical resistance. Thanks to these properties, HPA is widely used in high-tech applications such as LED sapphire substrates, semiconductor components, lithium batteries, and advanced ceramics, making it an essential material in modern industry.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/details>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>High purity alumina (HPA) powder exhibits exceptional optical, electrical, magnetic, thermal, and mechanical properties that far surpass those of conventional alumina. It is a critical advanced material widely used in aerospace, semiconductors, nuclear energy, new energy, metallurgy, biomedicine, lighting, machinery, and chemical industries. Today, HPA is considered one of the most valuable and versatile high-end [&hellip;]<\/p>\n","protected":false},"author":5,"featured_media":1051233,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[1],"tags":[],"class_list":["post-1051226","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-uncategorized"],"acf":[],"_links":{"self":[{"href":"https:\/\/vimaterial.de\/en\/wp-json\/wp\/v2\/posts\/1051226","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/vimaterial.de\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/vimaterial.de\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/vimaterial.de\/en\/wp-json\/wp\/v2\/users\/5"}],"replies":[{"embeddable":true,"href":"https:\/\/vimaterial.de\/en\/wp-json\/wp\/v2\/comments?post=1051226"}],"version-history":[{"count":11,"href":"https:\/\/vimaterial.de\/en\/wp-json\/wp\/v2\/posts\/1051226\/revisions"}],"predecessor-version":[{"id":1051242,"href":"https:\/\/vimaterial.de\/en\/wp-json\/wp\/v2\/posts\/1051226\/revisions\/1051242"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/vimaterial.de\/en\/wp-json\/wp\/v2\/media\/1051233"}],"wp:attachment":[{"href":"https:\/\/vimaterial.de\/en\/wp-json\/wp\/v2\/media?parent=1051226"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/vimaterial.de\/en\/wp-json\/wp\/v2\/categories?post=1051226"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/vimaterial.de\/en\/wp-json\/wp\/v2\/tags?post=1051226"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}