{"id":9239,"date":"2026-01-12T16:08:38","date_gmt":"2026-01-12T09:08:38","guid":{"rendered":"https:\/\/fujiice.vn\/?p=9239"},"modified":"2026-07-27T14:17:36","modified_gmt":"2026-07-27T07:17:36","slug":"what-is-gel-ice","status":"publish","type":"post","link":"https:\/\/fujiice.vn\/en\/what-is-gel-ice\/","title":{"rendered":"What Is Gel Ice? A Complete Guide to Composition, Structure &#038; Classification"},"content":{"rendered":"\n\n<div class=\"kk-star-ratings kksr-auto kksr-align-left kksr-valign-top\"\n    data-payload='{&quot;align&quot;:&quot;left&quot;,&quot;id&quot;:&quot;9239&quot;,&quot;slug&quot;:&quot;default&quot;,&quot;valign&quot;:&quot;top&quot;,&quot;ignore&quot;:&quot;&quot;,&quot;reference&quot;:&quot;auto&quot;,&quot;class&quot;:&quot;&quot;,&quot;count&quot;:&quot;1&quot;,&quot;legendonly&quot;:&quot;&quot;,&quot;readonly&quot;:&quot;&quot;,&quot;score&quot;:&quot;5&quot;,&quot;starsonly&quot;:&quot;&quot;,&quot;best&quot;:&quot;5&quot;,&quot;gap&quot;:&quot;5&quot;,&quot;greet&quot;:&quot;Rate this post&quot;,&quot;legend&quot;:&quot;5\\\/5 - (1 vote)&quot;,&quot;size&quot;:&quot;24&quot;,&quot;title&quot;:&quot;What Is Gel Ice? A Complete Guide to Composition, Structure \\u0026amp; Classification&quot;,&quot;width&quot;:&quot;142.5&quot;,&quot;_legend&quot;:&quot;{score}\\\/{best} - ({count} {votes})&quot;,&quot;font_factor&quot;:&quot;1.25&quot;}'>\n            \n<div class=\"kksr-stars\">\n    \n<div class=\"kksr-stars-inactive\">\n            <div class=\"kksr-star\" data-star=\"1\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" data-star=\"2\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" data-star=\"3\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" data-star=\"4\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" data-star=\"5\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n    <\/div>\n    \n<div class=\"kksr-stars-active\" style=\"width: 142.5px;\">\n            <div class=\"kksr-star\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n    <\/div>\n<\/div>\n                \n\n<div class=\"kksr-legend\" style=\"font-size: 19.2px;\">\n            5\/5 - (1 vote)    <\/div>\n    <\/div>\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_85 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Xem Nhanh<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/fujiice.vn\/en\/what-is-gel-ice\/#What_Is_a_Gel_Ice_Pack_Direct_Definition\" >What Is a Gel Ice Pack? (Direct Definition)<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/fujiice.vn\/en\/what-is-gel-ice\/#Development_History_From_a_1971_Medical_Invention_to_Modern_Cold_Chain\" >Development History: From a 1971 Medical Invention to Modern Cold Chain<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/fujiice.vn\/en\/what-is-gel-ice\/#Chemical_Composition_of_Gel_Ice\" >Chemical Composition of Gel Ice<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/fujiice.vn\/en\/what-is-gel-ice\/#1_Super_Absorbent_Polymer_SAP\" >1. Super Absorbent Polymer (SAP)<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/fujiice.vn\/en\/what-is-gel-ice\/#2_Water_H%E2%82%82O\" >2. Water (H\u2082O)<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/fujiice.vn\/en\/what-is-gel-ice\/#Physical_Structure_of_a_Gel_Ice_Pack\" >Physical Structure of a Gel Ice Pack<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/fujiice.vn\/en\/what-is-gel-ice\/#Outer_Shell_%E2%80%94_3_Main_Types_on_the_Market\" >Outer Shell \u2014 3 Main Types on the Market<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/fujiice.vn\/en\/what-is-gel-ice\/#The_Gel_Mixture_Inside_%E2%80%94_The_Phase-Change_Mechanism\" >The Gel Mixture Inside \u2014 The Phase-Change Mechanism<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/fujiice.vn\/en\/what-is-gel-ice\/#The_Science_Behind_It_Why_Is_Gel_Ice_Colder_and_Longer-Lasting_Than_Regular_Ice\" >The Science Behind It: Why Is Gel Ice Colder and Longer-Lasting Than Regular Ice?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/fujiice.vn\/en\/what-is-gel-ice\/#Classifying_Gel_Ice_by_Phase-Change_Temperature\" >Classifying Gel Ice by Phase-Change Temperature<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/fujiice.vn\/en\/what-is-gel-ice\/#Classifying_Gel_Ice_by_Packaging_Format\" >Classifying Gel Ice by Packaging Format<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/fujiice.vn\/en\/what-is-gel-ice\/#Pouch-Type_Gel_Ice\" >Pouch-Type Gel Ice<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/fujiice.vn\/en\/what-is-gel-ice\/#Rigid_Plastic_Box_Gel_Ice\" >Rigid Plastic Box Gel Ice<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"https:\/\/fujiice.vn\/en\/what-is-gel-ice\/#Safety_Standards_for_Gel_Ice\" >Safety Standards for Gel Ice<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-15\" href=\"https:\/\/fujiice.vn\/en\/what-is-gel-ice\/#Standard_Gel_Ice_Manufacturing_Process\" >Standard Gel Ice Manufacturing Process<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-16\" href=\"https:\/\/fujiice.vn\/en\/what-is-gel-ice\/#How_Does_Gel_Ice_Compare_to_Other_Cooling_Materials\" >How Does Gel Ice Compare to Other Cooling Materials?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-17\" href=\"https:\/\/fujiice.vn\/en\/what-is-gel-ice\/#Frequently_Asked_Questions_About_Gel_Ice_FAQ\" >Frequently Asked Questions About Gel Ice (FAQ)<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-18\" href=\"https:\/\/fujiice.vn\/en\/what-is-gel-ice\/#References\" >References<\/a><\/li><\/ul><\/li><\/ul><\/nav><\/div>\n<h2><span class=\"ez-toc-section\" id=\"What_Is_a_Gel_Ice_Pack_Direct_Definition\"><\/span>What Is a Gel Ice Pack? (Direct Definition)<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><a href=\"https:\/\/fujiice.vn\/da-gel\/\"><strong>Gel ice<\/strong><\/a> (also known as a <em>Gel Ice Pack<\/em> or <em>Ice Pack<\/em>) is a phase change material (PCM) made from a mixture of <strong>water<\/strong> and <strong>Super Absorbent Polymer (SAP)<\/strong> beads. Once frozen, the gel turns into a solid state and absorbs ambient heat as it melts, keeping the surrounding temperature stable and cold. Unlike regular ice, a gel ice pack doesn&#8217;t melt into liquid water \u2014 it stays in a thick gel form, so it never gets your goods wet.<\/p>\n<p>In practice, gel ice is packaged in <strong>PA\/PE laminated plastic pouches<\/strong> or <strong>rigid HDPE plastic boxes<\/strong>, and is widely used to preserve and transport fresh food, pharmaceuticals, vaccines, and cosmetics throughout the <a href=\"https:\/\/fujiice.vn\/chuoi-cung-ung-lanh\/\">cold supply chain<\/a>.<\/p>\n<p><img decoding=\"async\" class=\"aligncenter wp-image-5487\" src=\"https:\/\/fujiice.vn\/wp-content\/uploads\/2022\/11\/Tui-da-gel-Fuji-ice-500g-diem-noi-bat.jpg\" alt=\"What is a gel ice pack? Fuji Ice gel ice pack\" width=\"600\" height=\"600\" title=\"\" srcset=\"https:\/\/fujiice.vn\/wp-content\/uploads\/2022\/11\/Tui-da-gel-Fuji-ice-500g-diem-noi-bat.jpg 1000w, https:\/\/fujiice.vn\/wp-content\/uploads\/2022\/11\/Tui-da-gel-Fuji-ice-500g-diem-noi-bat-300x300.jpg 300w, https:\/\/fujiice.vn\/wp-content\/uploads\/2022\/11\/Tui-da-gel-Fuji-ice-500g-diem-noi-bat-150x150.jpg 150w, https:\/\/fujiice.vn\/wp-content\/uploads\/2022\/11\/Tui-da-gel-Fuji-ice-500g-diem-noi-bat-768x768.jpg 768w, https:\/\/fujiice.vn\/wp-content\/uploads\/2022\/11\/Tui-da-gel-Fuji-ice-500g-diem-noi-bat-450x450.jpg 450w\" sizes=\"(max-width: 600px) 100vw, 600px\" \/><\/p>\n<hr \/>\n<h2><span class=\"ez-toc-section\" id=\"Development_History_From_a_1971_Medical_Invention_to_Modern_Cold_Chain\"><\/span>Development History: From a 1971 Medical Invention to Modern Cold Chain<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Gel ice originated in the medical field, not the food industry.<\/p>\n<ul>\n<li><strong>1971:<\/strong> The first patent for a cold\/hot gel therapy pack (<em>&#8220;Gel application for hot and cold therapy&#8221;<\/em>) was filed by inventor Jacob in the United States, originally intended for pain relief and sports injury therapy.<\/li>\n<li><strong>1973:<\/strong> Patent number <strong>US 3,780,537<\/strong> was officially granted.<\/li>\n<li><strong>1990s\u20132000s:<\/strong> With the boom of e-commerce and cold logistics, gel ice shifted from medical use to mass adoption in the food and pharmaceutical industries.<\/li>\n<li><strong>Today:<\/strong> Gel ice is an indispensable part of commercial <a href=\"https:\/\/fujiice.vn\/bao-quan-lanh-la-gi-quy-trinh-phuong-phap\/\">cold storage<\/a>, gradually replacing traditional water ice thanks to its no-wetting property and multiple reusability.<\/li>\n<\/ul>\n<p><em>References: Ice pack history \u2014 Wikipedia; US Patent 3,780,537 \u2014 Google Patents<\/em><\/p>\n<hr \/>\n<h2><span class=\"ez-toc-section\" id=\"Chemical_Composition_of_Gel_Ice\"><\/span>Chemical Composition of Gel Ice<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>A standard gel ice pack consists of 2 main components:<\/p>\n<h3><span class=\"ez-toc-section\" id=\"1_Super_Absorbent_Polymer_SAP\"><\/span>1. Super Absorbent Polymer (SAP)<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><strong>SAP<\/strong> (commonly known scientifically as Sodium Polyacrylate) is a synthetic polymer capable of absorbing and retaining up to <strong>200\u2013500 times its dry weight<\/strong> in water. This is the component that creates the characteristic gel structure.<\/p>\n<p>To learn more about this component, see: <a href=\"https:\/\/fujiice.vn\/bot-sap-lam-da-gel\/\">SAP powder for gel ice<\/a> \u2014 a detailed analysis of its molecular structure and applications.<\/p>\n<p><strong>Chemical properties of SAP:<\/strong><\/p>\n<table>\n<thead>\n<tr>\n<th>Property<\/th>\n<th>Specification<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Chemical name<\/td>\n<td>Sodium Polyacrylate (Poly Acrylic Acid, sodium salt)<\/td>\n<\/tr>\n<tr>\n<td>Molecular formula<\/td>\n<td>[-CH\u2082-CH(COONa)-]\u2099<\/td>\n<\/tr>\n<tr>\n<td>Water absorption capacity<\/td>\n<td>200\u2013500 times its dry weight<\/td>\n<\/tr>\n<tr>\n<td>State<\/td>\n<td>White powder\/granules, turns into a thick gel on contact with water<\/td>\n<\/tr>\n<tr>\n<td>Safety<\/td>\n<td>Non-toxic, does not react with food, commonly used in baby diapers and supermarket food trays<\/td>\n<\/tr>\n<tr>\n<td>Melting point<\/td>\n<td>Depends on the water mixing ratio and the type of SAP used<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><strong>A note on SAP quality:<\/strong> Low-grade SAP suffers from &#8220;water separation&#8221; (<em>syneresis<\/em>) \u2014 the gel separates into layers after a number of freeze cycles, reducing cooling performance. High-grade SAP (as used in Fuji Ice products) maintains a stable gel structure through hundreds of freeze-thaw cycles.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"2_Water_H%E2%82%82O\"><\/span>2. Water (H\u2082O)<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Water is the solvent that combines with SAP to form the gel mixture. The water content in commercial gel ice typically accounts for <strong>85%\u201398% of the volume<\/strong>, depending on the phase-change temperature design of each product line.<\/p>\n<ul>\n<li><strong>0\u00b0C phase-change gel (basic type):<\/strong> Low SAP ratio, melting point close to that of ordinary water.<\/li>\n<li><strong>PCM gel with a phase-change range of -2.5\u00b0C to +5\u00b0C:<\/strong> Additional organic PCM additives are used to precisely fine-tune the phase-change temperature to match specific storage requirements.<\/li>\n<\/ul>\n<hr \/>\n<h2><span class=\"ez-toc-section\" id=\"Physical_Structure_of_a_Gel_Ice_Pack\"><\/span>Physical Structure of a Gel Ice Pack<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>A gel ice pack has 2 main structural parts: the <strong>outer shell<\/strong> and the <strong>gel mixture inside<\/strong>.<\/p>\n<figure id=\"attachment_7414\" aria-describedby=\"caption-attachment-7414\" style=\"width: 700px\" class=\"wp-caption aligncenter\"><img decoding=\"async\" class=\"wp-image-7414\" src=\"https:\/\/fujiice.vn\/wp-content\/uploads\/2025\/10\/Cau-tao-tui-da-gel-giu-lanh.webp\" alt=\"What is a gel ice pack? Structure of a gel ice cooling pouch\" width=\"700\" height=\"467\" title=\"\" srcset=\"https:\/\/fujiice.vn\/wp-content\/uploads\/2025\/10\/Cau-tao-tui-da-gel-giu-lanh.webp 1000w, https:\/\/fujiice.vn\/wp-content\/uploads\/2025\/10\/Cau-tao-tui-da-gel-giu-lanh-768x512.webp 768w\" sizes=\"(max-width: 700px) 100vw, 700px\" \/><figcaption id=\"caption-attachment-7414\" class=\"wp-caption-text\">What is a gel ice pack? Structure of a gel ice cooling pouch<\/figcaption><\/figure>\n<h3><span class=\"ez-toc-section\" id=\"Outer_Shell_%E2%80%94_3_Main_Types_on_the_Market\"><\/span>Outer Shell \u2014 3 Main Types on the Market<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>The outer shell&#8217;s function is to contain the gel mixture, prevent leaks, and withstand deep-freeze conditions. There are currently 3 common shell material types:<\/p>\n<table>\n<thead>\n<tr>\n<th>Shell type<\/th>\n<th>Material<\/th>\n<th>Durability<\/th>\n<th>Suitable applications<\/th>\n<th>Reusability<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td><strong>Single-layer PE pouch<\/strong><\/td>\n<td>Single-layer Polyethylene (PE) plastic<\/td>\n<td>Low \u2014 tears easily under puncture or heavy compression<\/td>\n<td>Single-use, low-value fresh food<\/td>\n<td>Limited (&lt;50 uses)<\/td>\n<\/tr>\n<tr>\n<td><strong>PA\/PE laminated pouch<\/strong><\/td>\n<td>2-layer laminate: Polyamide (PA) + Polyethylene (PE)<\/td>\n<td>High \u2014 double the durability of a single layer, strong puncture resistance<\/td>\n<td>Premium food, pharmaceuticals, export goods<\/td>\n<td>Good (100\u2013300 uses)<\/td>\n<\/tr>\n<tr>\n<td><strong>Rigid HDPE plastic box<\/strong><\/td>\n<td>Virgin High-Density Polyethylene (HDPE)<\/td>\n<td>Very high \u2014 high-tech fixed heat-sealed lid, impact resistant<\/td>\n<td>Vaccines, medical use, long-term commercial reuse<\/td>\n<td>Excellent (600\u2013800 uses)<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><strong>Why does PA\/PE laminated film outperform single-layer PE?<\/strong><\/p>\n<p>The outer Polyamide (PA) layer provides puncture resistance and withstands sub-zero temperatures without becoming brittle. The inner PE layer ensures reliable heat-sealing and safe food contact. This combination delivers far superior durability compared to single-layer PE film alone \u2014 which is why professional-grade gel ice products all use PA\/PE laminated pouches.<\/p>\n<p><img decoding=\"async\" class=\"aligncenter size-full wp-image-7282\" src=\"https:\/\/fujiice.vn\/wp-content\/uploads\/2024\/09\/gel-ice-pack-mang-pe.jpg\" alt=\"Gel ice pack using PE plastic film\" width=\"700\" height=\"465\" title=\"\"><\/p>\n<figure id=\"attachment_5586\" aria-describedby=\"caption-attachment-5586\" style=\"width: 700px\" class=\"wp-caption aligncenter\"><img decoding=\"async\" class=\"wp-image-5586\" src=\"https:\/\/fujiice.vn\/wp-content\/uploads\/2022\/11\/TUI-DA-GEL-FUJI-ICE-500G-kich-thuoc-bao-bi-1.png\" alt=\"Gel ice pack using PA\/PE laminated plastic film\" width=\"700\" height=\"700\" title=\"\" srcset=\"https:\/\/fujiice.vn\/wp-content\/uploads\/2022\/11\/TUI-DA-GEL-FUJI-ICE-500G-kich-thuoc-bao-bi-1.png 1000w, https:\/\/fujiice.vn\/wp-content\/uploads\/2022\/11\/TUI-DA-GEL-FUJI-ICE-500G-kich-thuoc-bao-bi-1-300x300.png 300w, https:\/\/fujiice.vn\/wp-content\/uploads\/2022\/11\/TUI-DA-GEL-FUJI-ICE-500G-kich-thuoc-bao-bi-1-150x150.png 150w, https:\/\/fujiice.vn\/wp-content\/uploads\/2022\/11\/TUI-DA-GEL-FUJI-ICE-500G-kich-thuoc-bao-bi-1-768x768.png 768w, https:\/\/fujiice.vn\/wp-content\/uploads\/2022\/11\/TUI-DA-GEL-FUJI-ICE-500G-kich-thuoc-bao-bi-1-450x450.png 450w\" sizes=\"(max-width: 700px) 100vw, 700px\" \/><figcaption id=\"caption-attachment-5586\" class=\"wp-caption-text\">Gel ice pack using PA\/PE laminated plastic film<\/figcaption><\/figure>\n<h3><span class=\"ez-toc-section\" id=\"The_Gel_Mixture_Inside_%E2%80%94_The_Phase-Change_Mechanism\"><\/span>The Gel Mixture Inside \u2014 The Phase-Change Mechanism<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>The gel mixture is the &#8220;soul&#8221; of the product. It works on the principle of <strong>phase change<\/strong>:<\/p>\n<ol>\n<li><strong>Heat-loading phase (Freezing):<\/strong> When placed in a freezer, the gel mixture absorbs cold energy and transitions from a gel state into a solid (frozen) state. Cold energy is stored within the polymer structure.<\/li>\n<li><strong>Heat-release phase (In use):<\/strong> Once removed from the freezer, the gel is exposed to ambient temperature. The melting process absorbs surrounding heat (an endothermic reaction), keeping the interior of the cooler box at a low temperature for an extended period.<\/li>\n<li><strong>Latent heat of phase change:<\/strong> This is why gel ice is more effective than ordinary ice \u2014 the latent heat energy of the phase-change process is far greater than the pure specific heat capacity of liquid water alone.<\/li>\n<\/ol>\n<hr \/>\n<h2><span class=\"ez-toc-section\" id=\"The_Science_Behind_It_Why_Is_Gel_Ice_Colder_and_Longer-Lasting_Than_Regular_Ice\"><\/span>The Science Behind It: Why Is Gel Ice Colder and Longer-Lasting Than Regular Ice?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>This is a core technical question that many users still don&#8217;t fully understand.<\/p>\n<figure id=\"attachment_8223\" aria-describedby=\"caption-attachment-8223\" style=\"width: 900px\" class=\"wp-caption aligncenter\"><img decoding=\"async\" class=\"wp-image-8223\" src=\"https:\/\/fujiice.vn\/wp-content\/uploads\/2026\/01\/nguyen-ly-chuyen-pha-da-gel-phase-change.webp\" alt=\"Diagram of the phase-change principle of gel ice: the freezing phase absorbs cold energy and the usage phase releases cold energy to keep goods cool\" width=\"900\" height=\"502\" title=\"\" srcset=\"https:\/\/fujiice.vn\/wp-content\/uploads\/2026\/01\/nguyen-ly-chuyen-pha-da-gel-phase-change.webp 1000w, https:\/\/fujiice.vn\/wp-content\/uploads\/2026\/01\/nguyen-ly-chuyen-pha-da-gel-phase-change-768x429.webp 768w\" sizes=\"(max-width: 900px) 100vw, 900px\" \/><figcaption id=\"caption-attachment-8223\" class=\"wp-caption-text\">Diagram of the phase-change principle of gel ice: the freezing phase absorbs cold energy and the usage phase releases cold energy to keep goods cool<\/figcaption><\/figure>\n<p><strong>Comparing the physical mechanisms:<\/strong><\/p>\n<table>\n<thead>\n<tr>\n<th>Criteria<\/th>\n<th>Regular water ice (H\u2082O)<\/th>\n<th>Gel ice (SAP + H\u2082O)<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td><strong>Composition<\/strong><\/td>\n<td>100% water (H\u2082O)<\/td>\n<td>Water + Sodium Polyacrylate (SAP)<\/td>\n<\/tr>\n<tr>\n<td><strong>Phase-change point<\/strong><\/td>\n<td>Fixed at 0\u00b0C<\/td>\n<td>Adjustable from -30\u00b0C to +5\u00b0C depending on design<\/td>\n<\/tr>\n<tr>\n<td><strong>State after melting<\/strong><\/td>\n<td>Liquid water \u2014 wets the goods<\/td>\n<td>Thick gel \u2014 doesn&#8217;t flow, doesn&#8217;t wet anything<\/td>\n<\/tr>\n<tr>\n<td><strong>Melting speed<\/strong><\/td>\n<td>Fast \u2014 surface contact creates runoff channels<\/td>\n<td>Slower \u2014 the polymer structure retains moisture<\/td>\n<\/tr>\n<tr>\n<td><strong>Cooling efficiency<\/strong><\/td>\n<td>Low (melted water loses heat quickly)<\/td>\n<td>2\u20133 times higher thanks to the gel structure and latent heat<\/td>\n<\/tr>\n<tr>\n<td><strong>Reusability<\/strong><\/td>\n<td>No (requires a separate container)<\/td>\n<td>Yes \u2014 can be refrozen and reused many times<\/td>\n<\/tr>\n<tr>\n<td><strong>Risk of wetting goods<\/strong><\/td>\n<td>High<\/td>\n<td>None (even if the pouch has a small leak)<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><strong>The science of latent heat, explained:<\/strong><\/p>\n<p>The solid-to-liquid phase change of water requires the absorption of approximately <strong>334 kJ\/kg<\/strong> (the latent heat of fusion of ice). Because gel ice&#8217;s polymer structure retains water within its network, it extends this phase-change process \u2014 meaning it releases cold energy more slowly and steadily over a longer period of time.<\/p>\n<hr \/>\n<h2><span class=\"ez-toc-section\" id=\"Classifying_Gel_Ice_by_Phase-Change_Temperature\"><\/span>Classifying Gel Ice by Phase-Change Temperature<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>This is the most important technical classification, helping determine the right type of gel ice for each specific application. For details on individual products and personalized advice, see <a href=\"https:\/\/fujiice.vn\/da-gel\/\">Fuji Ice gel ice packs<\/a>.<\/p>\n<table>\n<thead>\n<tr>\n<th>Classification<\/th>\n<th>Phase-change temperature<\/th>\n<th>Cooling temperature range<\/th>\n<th>Typical application<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td><strong>Basic gel ice (0\u00b0C)<\/strong><\/td>\n<td>0\u00b0C<\/td>\n<td>0\u00b0C \u2013 8\u00b0C<\/td>\n<td>Fresh food, vegetables and fruit, simple transport<\/td>\n<\/tr>\n<tr>\n<td><strong>-2.5\u00b0C phase-change gel (PCM Advance)<\/strong><\/td>\n<td>-2.5\u00b0C<\/td>\n<td>0\u00b0C \u2013 4\u00b0C<\/td>\n<td>Imported beef, premium seafood, premium beverages<\/td>\n<\/tr>\n<tr>\n<td><strong>PCM Phase 5 gel ice (+5\u00b0C)<\/strong><\/td>\n<td>+5\u00b0C<\/td>\n<td>2\u00b0C \u2013 8\u00b0C<\/td>\n<td>Vaccines, pharmaceuticals, medical biologics (must not be kept below 2\u00b0C)<\/td>\n<\/tr>\n<tr>\n<td><strong>Deep-frozen gel ice (-16\u00b0C to -18\u00b0C)<\/strong><\/td>\n<td>-16\u00b0C \/ -18\u00b0C<\/td>\n<td>-18\u00b0C \u2013 -12\u00b0C<\/td>\n<td>Frozen food, ice cream, dry-ice (CO\u2082) replacement<\/td>\n<\/tr>\n<tr>\n<td><strong>Ultra-low-temperature gel ice (-24\u00b0C to -30\u00b0C)<\/strong><\/td>\n<td>-24\u00b0C \/ -30\u00b0C<\/td>\n<td>-27\u00b0C \u2013 -21\u00b0C<\/td>\n<td>Special vaccines requiring ultra-low temperatures, biological products<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><strong>Important technical note:<\/strong> The phase-change temperature is not the same as the cooling temperature. The phase-change temperature is the point at which the gel begins to melt and absorb heat. The cooling temperature range is the range at which the contents inside the insulated container are kept throughout use.<\/p>\n<div class=\"row\"  id=\"row-510443033\">\n\n\t<div id=\"col-1359473601\" class=\"col medium-1\/3 large-4\"  >\n\t\t\t\t<div class=\"col-inner\"  >\n\t\t\t\n\t\t\t\n<figure id=\"attachment_7416\" aria-describedby=\"caption-attachment-7416\" style=\"width: 1000px\" class=\"wp-caption aligncenter\"><img decoding=\"async\" class=\"size-full wp-image-7416\" src=\"https:\/\/fujiice.vn\/wp-content\/uploads\/2025\/10\/Da-gel-bao-quan-ca-hoi.webp\" alt=\"Gel ice used to preserve salmon\" width=\"1000\" height=\"1000\" title=\"\" srcset=\"https:\/\/fujiice.vn\/wp-content\/uploads\/2025\/10\/Da-gel-bao-quan-ca-hoi.webp 1000w, https:\/\/fujiice.vn\/wp-content\/uploads\/2025\/10\/Da-gel-bao-quan-ca-hoi-150x150.webp 150w, https:\/\/fujiice.vn\/wp-content\/uploads\/2025\/10\/Da-gel-bao-quan-ca-hoi-768x768.webp 768w\" sizes=\"(max-width: 1000px) 100vw, 1000px\" \/><figcaption id=\"caption-attachment-7416\" class=\"wp-caption-text\">Gel ice used to preserve salmon<\/figcaption><\/figure>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\n\t\n\n\t<div id=\"col-1895040763\" class=\"col medium-1\/3 large-4\"  >\n\t\t\t\t<div class=\"col-inner\"  >\n\t\t\t\n\t\t\t\n<figure id=\"attachment_7419\" aria-describedby=\"caption-attachment-7419\" style=\"width: 1000px\" class=\"wp-caption aligncenter\"><img decoding=\"async\" class=\"size-full wp-image-7419\" src=\"https:\/\/fujiice.vn\/wp-content\/uploads\/2025\/10\/Da-gel-trong-thung-giu-lanh-thuc-pham.webp\" alt=\"Gel ice inside a food cooler box\" width=\"1000\" height=\"750\" title=\"\" srcset=\"https:\/\/fujiice.vn\/wp-content\/uploads\/2025\/10\/Da-gel-trong-thung-giu-lanh-thuc-pham.webp 1000w, https:\/\/fujiice.vn\/wp-content\/uploads\/2025\/10\/Da-gel-trong-thung-giu-lanh-thuc-pham-768x576.webp 768w\" sizes=\"(max-width: 1000px) 100vw, 1000px\" \/><figcaption id=\"caption-attachment-7419\" class=\"wp-caption-text\">Gel ice inside a food cooler box<\/figcaption><\/figure>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\n\t\n\n\t<div id=\"col-1521816936\" class=\"col medium-1\/3 large-4\"  >\n\t\t\t\t<div class=\"col-inner\"  >\n\t\t\t\n\t\t\t\n<figure id=\"attachment_7417\" aria-describedby=\"caption-attachment-7417\" style=\"width: 691px\" class=\"wp-caption aligncenter\"><img decoding=\"async\" class=\"size-full wp-image-7417\" src=\"https:\/\/fujiice.vn\/wp-content\/uploads\/2025\/10\/Da-gel-bao-quan-kem.webp\" alt=\"Gel ice used to preserve ice cream\" width=\"691\" height=\"1000\" title=\"\"><figcaption id=\"caption-attachment-7417\" class=\"wp-caption-text\">Gel ice used to preserve ice cream<\/figcaption><\/figure>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\n\t\n<\/div>\n<hr \/>\n<h2><span class=\"ez-toc-section\" id=\"Classifying_Gel_Ice_by_Packaging_Format\"><\/span>Classifying Gel Ice by Packaging Format<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3><span class=\"ez-toc-section\" id=\"Pouch-Type_Gel_Ice\"><\/span>Pouch-Type Gel Ice<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>The most common format on the market. The gel is packed in a soft, flexible plastic pouch that adapts to irregular spaces inside a shipping container. There are 2 material types: single-layer PE (cheaper, single-use) and PA\/PE laminate (durable, reusable many times).<\/p>\n<p>Applications: food, medical, and pharmaceutical transport. See also: <a href=\"https:\/\/fujiice.vn\/tui-gel-chuom-lanh-y-te\/\">medical cold-therapy gel packs<\/a> \u2014 a specialized medical application.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Rigid_Plastic_Box_Gel_Ice\"><\/span>Rigid Plastic Box Gel Ice<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Made from virgin HDPE shell with a high-tech fixed heat-sealed lid. Doesn&#8217;t deform when frozen, doesn&#8217;t leak, and can be reused 600\u2013800 times. Best suited for medical environments and vaccines that require precise temperature control.<\/p>\n<figure id=\"attachment_7237\" aria-describedby=\"caption-attachment-7237\" style=\"width: 700px\" class=\"wp-caption aligncenter\"><img decoding=\"async\" class=\"wp-image-7237\" src=\"https:\/\/fujiice.vn\/wp-content\/uploads\/2025\/03\/BOX-ECO.jpg\" alt=\"Fuji Ice Eco gel ice box\" width=\"700\" height=\"700\" title=\"\" srcset=\"https:\/\/fujiice.vn\/wp-content\/uploads\/2025\/03\/BOX-ECO.jpg 1000w, https:\/\/fujiice.vn\/wp-content\/uploads\/2025\/03\/BOX-ECO-150x150.jpg 150w, https:\/\/fujiice.vn\/wp-content\/uploads\/2025\/03\/BOX-ECO-768x768.jpg 768w\" sizes=\"(max-width: 700px) 100vw, 700px\" \/><figcaption id=\"caption-attachment-7237\" class=\"wp-caption-text\">Fuji Ice Eco gel ice box<\/figcaption><\/figure>\n<hr \/>\n<h2><span class=\"ez-toc-section\" id=\"Safety_Standards_for_Gel_Ice\"><\/span>Safety Standards for Gel Ice<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Gel ice is assessed as safe according to the following international and national standards:<\/p>\n<ul>\n<li><strong>FDA (USA):<\/strong> Sodium Polyacrylate is classified as Generally Recognized As Safe (GRAS) for indirect food contact.<\/li>\n<li><strong>EU Regulation 10\/2011:<\/strong> Permits SAP in food-contact materials, subject to migration limit regulations.<\/li>\n<li><strong>WHO EPI Guidelines (2024):<\/strong> Governs cold-chain materials for vaccines \u2014 phase-change (PCM) gel ice is a recommended solution for storage at 2\u00b0C\u20138\u00b0C. See also: <a href=\"https:\/\/fujiice.vn\/nhiet-do-bao-quan-vacxin\/\">vaccine storage temperature<\/a>.<\/li>\n<li><strong>TCVN (Vietnam):<\/strong> National standards on the safety of food-contact packaging materials.<\/li>\n<\/ul>\n<p><strong>Frequently asked safety questions:<\/strong><\/p>\n<p>Gel ice is <strong>non-toxic<\/strong> \u2014 SAP is an inert material, the same type of material used as the absorbent in baby diapers. However, it <strong>must not be eaten<\/strong>, as a large amount of SAP can cause a gastrointestinal blockage. If skin comes into contact with leaked gel: washing with plain water is sufficient. For a full breakdown of its safety profile, see our in-depth article: <a href=\"https:\/\/fujiice.vn\/da-gel-co-doc-khong\/\">is gel ice toxic?<\/a>.<\/p>\n<ul>\n<li>See also: <a href=\"https:\/\/fujiice.vn\/da-gel-co-duoc-mang-len-may-bay-khong\/\"><span data-sheets-root=\"1\">is gel ice allowed on airplanes?<\/span><\/a><\/li>\n<\/ul>\n<hr \/>\n<h2><span class=\"ez-toc-section\" id=\"Standard_Gel_Ice_Manufacturing_Process\"><\/span>Standard Gel Ice Manufacturing Process<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Gel ice quality depends directly on the manufacturing process. The standard process consists of 4 steps:<\/p>\n<ol>\n<li><strong>Mixing:<\/strong> SAP is precisely measured using automatic dosing equipment and mixed with purified, treated water at a designed ratio. The SAP-to-water ratio determines the phase-change temperature and the gel&#8217;s consistency.<\/li>\n<li><strong>Filling:<\/strong> The gel solution is pumped into pouches\/boxes using automatic filling machines, with precise volume control.<\/li>\n<li><strong>Sealing:<\/strong> Heat-sealing or radio-frequency (RF) welding technology ensures the seal doesn&#8217;t rupture under heavy pressure or freezing conditions.<\/li>\n<li><strong>Quality inspection:<\/strong> Leak testing, phase-change temperature testing in the lab, and mechanical durability testing before the product leaves the factory.<\/li>\n<\/ol>\n<p><strong>Quality certification:<\/strong> The product meets ISO 9001:2015 standards for quality management in production.<\/p>\n<hr \/>\n<h2><span class=\"ez-toc-section\" id=\"How_Does_Gel_Ice_Compare_to_Other_Cooling_Materials\"><\/span>How Does Gel Ice Compare to Other Cooling Materials?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<table>\n<thead>\n<tr>\n<th>Criteria<\/th>\n<th>Gel ice<\/th>\n<th>Dry ice (solid CO\u2082)<\/th>\n<th>Regular ice cubes<\/th>\n<th>Old-style hard frozen water (Blue Ice)<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td><strong>Composition<\/strong><\/td>\n<td>Water + SAP<\/td>\n<td>Solid CO\u2082<\/td>\n<td>Pure H\u2082O<\/td>\n<td>Water (no SAP)<\/td>\n<\/tr>\n<tr>\n<td><strong>Temperature<\/strong><\/td>\n<td>-30\u00b0C to +5\u00b0C (depending on type)<\/td>\n<td>-78.5\u00b0C<\/td>\n<td>0\u00b0C<\/td>\n<td>0\u00b0C<\/td>\n<\/tr>\n<tr>\n<td><strong>Safe for food contact<\/strong><\/td>\n<td>\u2705 Yes<\/td>\n<td>\u274c No (CO\u2082 causes cold burns)<\/td>\n<td>\u2705 Yes<\/td>\n<td>\u2705 Yes<\/td>\n<\/tr>\n<tr>\n<td><strong>Wets goods<\/strong><\/td>\n<td>\u274c No (gel doesn&#8217;t flow)<\/td>\n<td>\u274c No (sublimates into gas)<\/td>\n<td>\u2705 Yes (melts into water)<\/td>\n<td>\u2705 Yes (melts into water)<\/td>\n<\/tr>\n<tr>\n<td><strong>Reusable<\/strong><\/td>\n<td>\u2705 Multiple times<\/td>\n<td>\u274c Single use<\/td>\n<td>\u274c No<\/td>\n<td>\u2705 Yes<\/td>\n<\/tr>\n<tr>\n<td><strong>Air transport<\/strong><\/td>\n<td>\u2705 Permitted (with conditions)<\/td>\n<td>\u26a0\ufe0f Restricted (dangerous goods)<\/td>\n<td>\u2705 Yes<\/td>\n<td>\u2705 Yes<\/td>\n<\/tr>\n<tr>\n<td><strong>Long-term cost<\/strong><\/td>\n<td>Low (reusable)<\/td>\n<td>High (single use)<\/td>\n<td>Low but must be bought continuously<\/td>\n<td>Moderate<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>For a detailed breakdown, see: <a href=\"https:\/\/fujiice.vn\/da-kho-va-da-gel\/\">gel ice vs. dry ice<\/a> \u2014 a comprehensive comparison across usage scenarios.<\/p>\n<figure id=\"attachment_8224\" aria-describedby=\"caption-attachment-8224\" style=\"width: 707px\" class=\"wp-caption aligncenter\"><img decoding=\"async\" class=\"size-full wp-image-8224\" src=\"https:\/\/fujiice.vn\/wp-content\/uploads\/2026\/01\/ung-dung-da-gel-thuc-pham-vacxin-duoc-pham.webp\" alt=\"Applications of Fuji Ice gel ice packs for preserving fresh food, medical vaccines, and pharmaceutical transport\" width=\"707\" height=\"1000\" title=\"\"><figcaption id=\"caption-attachment-8224\" class=\"wp-caption-text\">Applications of Fuji Ice gel ice packs for preserving fresh food, medical vaccines, and pharmaceutical transport<\/figcaption><\/figure>\n<hr \/>\n<h2><span class=\"ez-toc-section\" id=\"Frequently_Asked_Questions_About_Gel_Ice_FAQ\"><\/span>Frequently Asked Questions About Gel Ice (FAQ)<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><strong>Q: What is a gel ice pack, scientifically speaking?<\/strong> A: A gel ice pack is a phase change material (PCM) made from a mixture of water and Sodium Polyacrylate (SAP \u2014 Super Absorbent Polymer). It works on the principle of latent heat: absorbing heat during the melting process to maintain a stable, cold temperature around the goods being preserved.<\/p>\n<p><strong>Q: What is the SAP in gel ice?<\/strong> A: SAP (Super Absorbent Polymer) is a synthetic polymer \u2014 specifically Sodium Polyacrylate \u2014 capable of absorbing 200\u2013500 times its weight in water. It&#8217;s a safe material, part of the same material family used in baby diapers and supermarket food trays. When combined with water, it forms a thick gel \u2014 the core component of a cooling gel ice pack. Details at: <a href=\"https:\/\/fujiice.vn\/bot-sap-lam-da-gel\/\">SAP powder for gel ice<\/a>.<\/p>\n<p><strong>Q: Why doesn&#8217;t gel ice melt into water like regular ice?<\/strong> A: Because the SAP polymer&#8217;s network structure holds water molecules within a stable 3D structure. Even after the gel transitions from solid to liquid (after melting), the water molecules remain trapped within the polymer network, forming a thick gel rather than free-flowing liquid water.<\/p>\n<p><strong>Q: What does &#8220;gel&#8221; mean in relation to gel ice?<\/strong> A: &#8220;Gel&#8221; in gel ice refers to a state of matter \u2014 a colloidal state with a polymer network structure that holds a liquid phase inside it. Gel ice is a product that applies this gel state for the purpose of cooling.<\/p>\n<p><strong>Q: What are the components of a gel ice pack?<\/strong> A: A gel ice pack consists of 2 parts: (1) the outer shell \u2014 a PA\/PE laminated plastic pouch or a rigid HDPE plastic box, which contains and protects the gel from leaking; (2) the gel mixture inside \u2014 water + SAP (Sodium Polyacrylate), which is the component that stores and releases cold energy through the phase-change mechanism.<\/p>\n<hr \/>\n<h3><span class=\"ez-toc-section\" id=\"References\"><\/span>References<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<ul>\n<li>US Patent 3,780,537 \u2014 <em>Gel composition for filling flexible containers for use as hot or cold packs<\/em> (1973)<\/li>\n<li>Wikipedia: <em>Ice pack<\/em> \u2014 <a href=\"https:\/\/en.wikipedia.org\/wiki\/Ice_pack\" rel=\"nofollow noopener\" target=\"_blank\">https:\/\/en.wikipedia.org\/wiki\/Ice_pack<\/a> &#8211; <a href=\"https:\/\/vi.wikipedia.org\/wiki\/%C4%90%C3%A1_gel\" rel=\"nofollow noopener\" target=\"_blank\">https:\/\/vi.wikipedia.org\/wiki\/\u0111\u00e1_gel<\/a><\/li>\n<li>WHO EPI Guidelines 2024 \u2014 <em>Temperature requirements for vaccine storage and transport<\/em><\/li>\n<li>FDA GRAS Database \u2014 Sodium Polyacrylate food contact substances<\/li>\n<li><a href=\"https:\/\/nortechlabs.com\/company-info\/nortech-history\/\" rel=\"nofollow noopener\" target=\"_blank\">https:\/\/nortechlabs.com\/company-info\/nortech-history\/<\/a><\/li>\n<\/ul>\n<div class=\"mceTemp\"><\/div>\n","protected":false},"excerpt":{"rendered":"<p>What Is a Gel Ice Pack? (Direct Definition) Gel ice (also known as a Gel Ice Pack or Ice Pack) is a phase change material (PCM) made from a mixture of water and Super Absorbent Polymer (SAP) beads. Once frozen, the gel turns into a solid state and absorbs ambient heat as it melts, keeping&#8230;<\/p>\n","protected":false},"author":6,"featured_media":9057,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-9239","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-uncategorized-vi"],"_links":{"self":[{"href":"https:\/\/fujiice.vn\/en\/wp-json\/wp\/v2\/posts\/9239","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/fujiice.vn\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/fujiice.vn\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/fujiice.vn\/en\/wp-json\/wp\/v2\/users\/6"}],"replies":[{"embeddable":true,"href":"https:\/\/fujiice.vn\/en\/wp-json\/wp\/v2\/comments?post=9239"}],"version-history":[{"count":2,"href":"https:\/\/fujiice.vn\/en\/wp-json\/wp\/v2\/posts\/9239\/revisions"}],"predecessor-version":[{"id":9241,"href":"https:\/\/fujiice.vn\/en\/wp-json\/wp\/v2\/posts\/9239\/revisions\/9241"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/fujiice.vn\/en\/wp-json\/wp\/v2\/media\/9057"}],"wp:attachment":[{"href":"https:\/\/fujiice.vn\/en\/wp-json\/wp\/v2\/media?parent=9239"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fujiice.vn\/en\/wp-json\/wp\/v2\/categories?post=9239"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fujiice.vn\/en\/wp-json\/wp\/v2\/tags?post=9239"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}