{"id":2626,"date":"2026-05-13T07:18:29","date_gmt":"2026-05-13T07:18:29","guid":{"rendered":"https:\/\/www.pharmacopoeiatest.com\/?p=2626"},"modified":"2026-05-13T07:18:31","modified_gmt":"2026-05-13T07:18:31","slug":"astm-f1921","status":"publish","type":"post","link":"https:\/\/www.pharmacopoeiatest.com\/uk\/astm-f1921\/","title":{"rendered":"ASTM F1921"},"content":{"rendered":"<div data-elementor-type=\"wp-post\" data-elementor-id=\"2626\" class=\"elementor elementor-2626\" data-elementor-post-type=\"post\">\n\t\t\t\t<div class=\"elementor-element elementor-element-8bb07f6 e-flex e-con-boxed e-con e-parent\" data-id=\"8bb07f6\" data-element_type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-d03e4ae elementor-widget elementor-widget-heading\" data-id=\"d03e4ae\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t<h1 class=\"elementor-heading-title elementor-size-default\">ASTM F1921<br><small><small>Hot Tack Strength for Pharmaceutical Packaging<\/small><\/small><\/h1>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-2e29ec3 elementor-widget elementor-widget-image\" data-id=\"2e29ec3\" data-element_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<img fetchpriority=\"high\" decoding=\"async\" width=\"300\" height=\"198\" src=\"https:\/\/www.pharmacopoeiatest.com\/wp-content\/uploads\/2026\/05\/pharmaceutical-packaging-need-hot-tack-test-300x198.webp\" class=\"attachment-medium size-medium wp-image-2635\" alt=\"pharmaceutical packaging need hot tack test\" srcset=\"https:\/\/www.pharmacopoeiatest.com\/wp-content\/uploads\/2026\/05\/pharmaceutical-packaging-need-hot-tack-test-300x198.webp 300w, https:\/\/www.pharmacopoeiatest.com\/wp-content\/uploads\/2026\/05\/pharmaceutical-packaging-need-hot-tack-test-768x507.webp 768w, https:\/\/www.pharmacopoeiatest.com\/wp-content\/uploads\/2026\/05\/pharmaceutical-packaging-need-hot-tack-test-18x12.webp 18w, https:\/\/www.pharmacopoeiatest.com\/wp-content\/uploads\/2026\/05\/pharmaceutical-packaging-need-hot-tack-test.webp 1023w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/>\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-d98951b elementor-widget elementor-widget-heading\" data-id=\"d98951b\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">ASTM F1921 in Flexible Packaging Seal Performance<\/h2>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-f604883 elementor-widget__width-initial elementor-widget elementor-widget-text-editor\" data-id=\"f604883\" data-element_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<p data-start=\"585\" data-end=\"946\">\u0423 \"The <strong data-start=\"589\" data-end=\"603\">ASTM F1921<\/strong> standard defines a critical laboratory method used to evaluate the <strong data-start=\"671\" data-end=\"692\">hot tack strength<\/strong> of thermoplastic materials immediately after heat sealing and before the seal cools to ambient conditions. This property is essential in high-speed <strong data-start=\"841\" data-end=\"875\">form-fill-seal packaging lines<\/strong>, where seals must resist stress while still hot and mechanically weak.<\/p><p data-start=\"948\" data-end=\"1309\">In practical terms, <strong data-start=\"968\" data-end=\"982\">ASTM F1921<\/strong> helps manufacturers determine whether a heat-sealed film can withstand the forces applied during packaging operations without failure. This makes it particularly valuable for <strong data-start=\"1158\" data-end=\"1239\">pharmaceutical packaging, food packaging, and medical sterile barrier systems<\/strong>, where seal integrity directly impacts product safety and compliance.<\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-592eb77 elementor-widget elementor-widget-heading\" data-id=\"592eb77\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Why Hot Tack Strength Matters in Pharmaceutical Packaging<\/h2>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-4fd3f86 elementor-widget elementor-widget-text-editor\" data-id=\"4fd3f86\" data-element_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<p data-start=\"1466\" data-end=\"1716\">In <strong data-start=\"1469\" data-end=\"1505\">pharmaceutical packaging systems<\/strong>, seals often experience mechanical stress immediately after formation. If the <strong data-start=\"1584\" data-end=\"1605\">hot tack strength<\/strong> is insufficient, seals may open or deform before cooling, leading to contamination risks or product rejection.<\/p><p data-start=\"1718\" data-end=\"1961\">\u0423 \"The <strong data-start=\"1722\" data-end=\"1739\">hot tack test<\/strong> defined in ASTM F1921 measures this early-stage seal resistance by applying controlled peel forces during the cooling phase. This provides realistic insight into how packaging materials behave under production conditions.<\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-558221a elementor-widget elementor-widget-heading\" data-id=\"558221a\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Hot Tack Tester Function in ASTM F1921 Evaluation<\/h2>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-1f2efba elementor-widget elementor-widget-text-editor\" data-id=\"1f2efba\" data-element_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<p data-start=\"2018\" data-end=\"2210\">A <strong data-start=\"2020\" data-end=\"2039\">hot tack tester<\/strong> is the core instrument used for executing ASTM F1921 procedures. It simulates sealing, controlled cooling, and immediate peel separation under defined conditions such as:<\/p><ul data-start=\"2212\" data-end=\"2297\"><li data-section-id=\"1do3oe7\" data-start=\"2212\" data-end=\"2235\">Sealing temperature<\/li><li data-section-id=\"1lfmgaz\" data-start=\"2236\" data-end=\"2250\">Dwell time<\/li><li data-section-id=\"l8b1w6\" data-start=\"2251\" data-end=\"2271\">Sealing pressure<\/li><li data-section-id=\"14fg5e3\" data-start=\"2272\" data-end=\"2297\">Grip separation speed<\/li><\/ul><p data-start=\"2299\" data-end=\"2458\">The tester records the <strong data-start=\"2322\" data-end=\"2354\">maximum peel force over time<\/strong>, generating a hot tack curve that indicates material performance across different sealing temperatures.<\/p><p data-start=\"2460\" data-end=\"2680\">Cell Instruments provides advanced solutions such as the <strong data-start=\"2517\" data-end=\"2547\">Hot Tack Tester HTT series<\/strong>, which supports both Method A and Method B of ASTM F1921, ensuring compliance and high repeatability for industrial QA laboratories.<\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-10450b4 elementor-widget elementor-widget-heading\" data-id=\"10450b4\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">ASTM F1921 Test Principle and Process<\/h2>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-ff524ae elementor-widget elementor-widget-text-editor\" data-id=\"ff524ae\" data-element_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<h3 data-section-id=\"bpw35q\" data-start=\"2743\" data-end=\"2796\">Heat Seal Formation and Immediate Peel Evaluation<\/h3><p data-start=\"2798\" data-end=\"2940\">The ASTM F1921 method begins by forming a heat seal between two thermoplastic layers under controlled pressure and temperature. After sealing:<\/p><ul data-start=\"2942\" data-end=\"3136\"><li data-section-id=\"xfcsdt\" data-start=\"2942\" data-end=\"3029\">The sealed specimen is automatically transferred into a controlled withdrawal phase<\/li><li data-section-id=\"1y50d3t\" data-start=\"3030\" data-end=\"3071\">The grips separate at a defined speed<\/li><li data-section-id=\"njso5a\" data-start=\"3072\" data-end=\"3136\">The force required to peel the seal is continuously measured<\/li><\/ul><p data-start=\"3138\" data-end=\"3297\">This process captures the <strong data-start=\"3164\" data-end=\"3210\">hot tack strength evolution during cooling<\/strong>, which is essential for understanding seal robustness in real production environments.<\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-72ed575 elementor-widget elementor-widget-heading\" data-id=\"72ed575\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Test Methods Defined in ASTM F1921<\/h2>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-486f3a1 e-grid e-con-full e-con e-child\" data-id=\"486f3a1\" data-element_type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-87b40ff elementor-widget elementor-widget-text-editor\" data-id=\"87b40ff\" data-element_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<h3 data-section-id=\"1d98d75\" data-start=\"3343\" data-end=\"3388\">Method A \u2013 Fixed Delay Cooling Evaluation<\/h3><p data-start=\"3390\" data-end=\"3575\">Method A records hot tack strength at predefined cooling intervals after a fixed delay. This method generates a detailed <strong data-start=\"3511\" data-end=\"3528\">cooling curve<\/strong>, showing how seal strength develops over time.<\/p><p data-start=\"3577\" data-end=\"3609\">Typical characteristics include:<\/p><ul data-start=\"3611\" data-end=\"3739\"><li data-section-id=\"1r2tus8\" data-start=\"3611\" data-end=\"3645\">Fixed delay before measurement<\/li><li data-section-id=\"g3x3e8\" data-start=\"3646\" data-end=\"3684\">Multiple time-point force readings<\/li><li data-section-id=\"kbyhok\" data-start=\"3685\" data-end=\"3739\">Cooling curve construction for material comparison<\/li><\/ul><p data-start=\"3741\" data-end=\"3810\">This method is widely used for material R&amp;D and comparative analysis.<\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-30dacd0 elementor-widget elementor-widget-text-editor\" data-id=\"30dacd0\" data-element_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<h3 data-section-id=\"1073sib\" data-start=\"3817\" data-end=\"3869\">Method B \u2013 Variable Delay Peak Force Measurement<\/h3><p data-start=\"3871\" data-end=\"4088\">Method B focuses on measuring the <strong data-start=\"3905\" data-end=\"3934\">maximum hot tack strength<\/strong> after a user-defined delay. It is particularly suitable for production quality control where peak performance is more important than full curve analysis.<\/p><p data-start=\"4090\" data-end=\"4118\">Key characteristics include:<\/p><ul data-start=\"4120\" data-end=\"4229\"><li data-section-id=\"met80u\" data-start=\"4120\" data-end=\"4147\">Variable delay settings<\/li><li data-section-id=\"3szyy5\" data-start=\"4148\" data-end=\"4187\">Maximum force detection during peel<\/li><li data-section-id=\"dhnbgm\" data-start=\"4188\" data-end=\"4229\">Faster evaluation for QC environments<\/li><\/ul>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-71b126c elementor-widget elementor-widget-heading\" data-id=\"71b126c\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Key Testing Parameters in ASTM F1921<\/h2>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-c62d41c elementor-widget elementor-widget-text-editor\" data-id=\"c62d41c\" data-element_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<p data-start=\"4277\" data-end=\"4374\">ASTM F1921 emphasizes strict control of sealing and testing conditions to ensure reproducibility:<\/p><ul data-start=\"4376\" data-end=\"4629\"><li data-section-id=\"1nvilt7\" data-start=\"4376\" data-end=\"4460\"><strong data-start=\"4378\" data-end=\"4392\">Dwell time<\/strong> varies depending on film thickness (0.5 s to 2.5 s typical range)<\/li><li data-section-id=\"o6uc05\" data-start=\"4461\" data-end=\"4509\"><strong data-start=\"4463\" data-end=\"4483\">Sealing pressure<\/strong> ranges from 15\u201330 N\/cm\u00b2<\/li><li data-section-id=\"u2m8a3\" data-start=\"4510\" data-end=\"4555\"><strong data-start=\"4512\" data-end=\"4526\">Peel speed<\/strong> commonly set at 200 mm\/min<\/li><li data-section-id=\"1w1hhma\" data-start=\"4556\" data-end=\"4629\"><strong data-start=\"4558\" data-end=\"4588\">Multiple temperature steps<\/strong> are used to construct a hot tack curve<\/li><\/ul><p data-start=\"4631\" data-end=\"4706\">These parameters ensure that results reflect real-world packaging behavior.<\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-b779702 elementor-widget elementor-widget-heading\" data-id=\"b779702\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Failure Mode Analysis in Hot Tack Testing<\/h2>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-2a95bbf elementor-widget elementor-widget-text-editor\" data-id=\"2a95bbf\" data-element_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<p data-start=\"4759\" data-end=\"4838\">ASTM F1921 requires detailed documentation of failure modes, which may include:<\/p><ul data-start=\"4840\" data-end=\"4983\"><li data-section-id=\"c5ccgp\" data-start=\"4840\" data-end=\"4873\">Adhesive failure at interface<\/li><li data-section-id=\"f8h15p\" data-start=\"4874\" data-end=\"4912\">Cohesive failure within seal layer<\/li><li data-section-id=\"1lk3j3x\" data-start=\"4913\" data-end=\"4934\">Film delamination<\/li><li data-section-id=\"13bvrj6\" data-start=\"4935\" data-end=\"4955\">Material rupture<\/li><li data-section-id=\"wy1zh8\" data-start=\"4956\" data-end=\"4983\">Elongation before break<\/li><\/ul><p data-start=\"4985\" data-end=\"5119\">Failure mode classification is essential for interpreting whether limitations originate from material structure or sealing conditions.<\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-be5e0d9 elementor-widget elementor-widget-heading\" data-id=\"be5e0d9\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Cell Instruments Hot Tack Tester for ASTM F1921<\/h2>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-3c19142 e-con-full e-flex e-con e-child\" data-id=\"3c19142\" data-element_type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-bba4a6e elementor-widget__width-inherit elementor-widget elementor-widget-text-editor\" data-id=\"bba4a6e\" data-element_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<p data-start=\"5627\" data-end=\"5761\">Cell Instruments develops advanced <strong data-start=\"5662\" data-end=\"5689\">hot tack tester systems<\/strong> designed specifically for ASTM F1921 compliance. The HTT series offers:<\/p><ul data-start=\"5763\" data-end=\"5962\"><li data-section-id=\"2icpvp\" data-start=\"5763\" data-end=\"5798\">Precise PID temperature control<\/li><li data-section-id=\"zixvs2\" data-start=\"5799\" data-end=\"5835\">Automated sealing and peel cycle<\/li><li data-section-id=\"1ak0c9g\" data-start=\"5836\" data-end=\"5873\">Support for Method A and Method B<\/li><li data-section-id=\"1aelrgv\" data-start=\"5874\" data-end=\"5926\">High-speed testing up to industrial requirements<\/li><li data-section-id=\"1dckeg4\" data-start=\"5927\" data-end=\"5962\">Stable PLC-based control system<\/li><\/ul><p data-start=\"5964\" data-end=\"6152\">The system ensures consistent measurement of <strong data-start=\"6009\" data-end=\"6059\">hot tack strength for pharmaceutical packaging<\/strong>, helping laboratories and manufacturers maintain regulatory and quality assurance standards.<\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-f20c734 elementor-widget__width-initial elementor-widget elementor-widget-image\" data-id=\"f20c734\" data-element_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<img decoding=\"async\" width=\"768\" height=\"1284\" src=\"https:\/\/www.pharmacopoeiatest.com\/wp-content\/uploads\/2026\/05\/ASTM-F1921-Hot-Tack-Tester-for-pharmaceutical-Packaging-Strength-768x1284.webp\" class=\"attachment-medium_large size-medium_large wp-image-2636\" alt=\"ASTM F1921 Hot Tack Tester for pharmaceutical Packaging Strength\" srcset=\"https:\/\/www.pharmacopoeiatest.com\/wp-content\/uploads\/2026\/05\/ASTM-F1921-Hot-Tack-Tester-for-pharmaceutical-Packaging-Strength-768x1284.webp 768w, https:\/\/www.pharmacopoeiatest.com\/wp-content\/uploads\/2026\/05\/ASTM-F1921-Hot-Tack-Tester-for-pharmaceutical-Packaging-Strength-179x300.webp 179w, https:\/\/www.pharmacopoeiatest.com\/wp-content\/uploads\/2026\/05\/ASTM-F1921-Hot-Tack-Tester-for-pharmaceutical-Packaging-Strength-613x1024.webp 613w, https:\/\/www.pharmacopoeiatest.com\/wp-content\/uploads\/2026\/05\/ASTM-F1921-Hot-Tack-Tester-for-pharmaceutical-Packaging-Strength-919x1536.webp 919w, https:\/\/www.pharmacopoeiatest.com\/wp-content\/uploads\/2026\/05\/ASTM-F1921-Hot-Tack-Tester-for-pharmaceutical-Packaging-Strength-1225x2048.webp 1225w, https:\/\/www.pharmacopoeiatest.com\/wp-content\/uploads\/2026\/05\/ASTM-F1921-Hot-Tack-Tester-for-pharmaceutical-Packaging-Strength-7x12.webp 7w, https:\/\/www.pharmacopoeiatest.com\/wp-content\/uploads\/2026\/05\/ASTM-F1921-Hot-Tack-Tester-for-pharmaceutical-Packaging-Strength-scaled.webp 1531w\" sizes=\"(max-width: 768px) 100vw, 768px\" \/>\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>\n\t\t\t\t<div class=\"elementor-element elementor-element-5071eda elementor-widget elementor-widget-text-editor\" data-id=\"5071eda\" data-element_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<h2>FAQs about ASTM F1921<\/h2><p><strong>What is ASTM F1921 used for?<\/strong><br \/>ASTM F1921 is used to measure the hot tack strength of heat seals in thermoplastic films before they cool, helping evaluate packaging performance during production.<\/p><p><strong>Why is hot tack strength important in packaging?<br \/><\/strong>Hot tack strength ensures that seals can resist stress immediately after formation, preventing seal failure during high-speed packaging processes.<\/p><p><strong>What is the difference between Method A and Method B?<br \/><\/strong>Method A measures hot tack strength over a cooling curve, while Method B focuses on maximum force after a set delay time.<\/p><p><strong>Which industries use hot tack testing?<br \/><\/strong>It is widely used in pharmaceutical, food, medical device packaging, adhesives, and flexible film manufacturing industries.<\/p><p><strong>What instruments are used for ASTM F1921 testing?<br \/><\/strong>A hot tack tester, such as the Cell Instruments HTT series, is used to perform controlled sealing and peel testing according to <a href=\"https:\/\/store.astm.org\/f1921_f1921m-12r23.html\" target=\"_blank\" rel=\"noopener\">ASTM F1921<\/a>.<\/p>\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>","protected":false},"excerpt":{"rendered":"<p>ASTM F1921Hot Tack Strength for Pharmaceutical Packaging ASTM F1921 in Flexible Packaging Seal Performance The ASTM F1921 standard defines a critical laboratory method used to evaluate the hot tack strength of thermoplastic materials immediately after heat sealing and before the seal cools to ambient conditions. This property is essential in high-speed form-fill-seal packaging lines, where [&hellip;]<\/p>","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_uag_custom_page_level_css":"","site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-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-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-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""}},"footnotes":""},"categories":[26],"tags":[],"class_list":["post-2626","post","type-post","status-publish","format-standard","hentry","category-blog"],"acf":[],"uagb_featured_image_src":{"full":false,"thumbnail":false,"medium":false,"medium_large":false,"large":false,"1536x1536":false,"2048x2048":false,"trp-custom-language-flag":false},"uagb_author_info":{"display_name":"pharmacopoeiatest","author_link":"https:\/\/www.pharmacopoeiatest.com\/uk\/author\/pharmacopoeiatest\/"},"uagb_comment_info":0,"uagb_excerpt":"ASTM F1921Hot Tack Strength for Pharmaceutical Packaging ASTM F1921 in Flexible Packaging Seal Performance The ASTM F1921 standard defines a critical laboratory method used to evaluate the hot tack strength of thermoplastic materials immediately after heat sealing and before the seal cools to ambient conditions. This property is essential in high-speed form-fill-seal packaging lines, where&hellip;","_links":{"self":[{"href":"https:\/\/www.pharmacopoeiatest.com\/uk\/wp-json\/wp\/v2\/posts\/2626","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.pharmacopoeiatest.com\/uk\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.pharmacopoeiatest.com\/uk\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.pharmacopoeiatest.com\/uk\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.pharmacopoeiatest.com\/uk\/wp-json\/wp\/v2\/comments?post=2626"}],"version-history":[{"count":5,"href":"https:\/\/www.pharmacopoeiatest.com\/uk\/wp-json\/wp\/v2\/posts\/2626\/revisions"}],"predecessor-version":[{"id":2639,"href":"https:\/\/www.pharmacopoeiatest.com\/uk\/wp-json\/wp\/v2\/posts\/2626\/revisions\/2639"}],"wp:attachment":[{"href":"https:\/\/www.pharmacopoeiatest.com\/uk\/wp-json\/wp\/v2\/media?parent=2626"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.pharmacopoeiatest.com\/uk\/wp-json\/wp\/v2\/categories?post=2626"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.pharmacopoeiatest.com\/uk\/wp-json\/wp\/v2\/tags?post=2626"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}