{"id":3288,"date":"2026-05-12T06:02:54","date_gmt":"2026-05-12T06:02:54","guid":{"rendered":"https:\/\/www.materialstests.com\/?post_type=application&#038;p=3288"},"modified":"2026-05-12T06:02:56","modified_gmt":"2026-05-12T06:02:56","slug":"astm-f1921","status":"publish","type":"application","link":"https:\/\/www.materialstests.com\/ru\/application\/astm-f1921.html","title":{"rendered":"ASTM F1921"},"content":{"rendered":"<h2 class=\"wp-block-heading\">Understanding ASTM F1921 and Its Role in Seal Integrity<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>ASTM F1921<\/strong> defines standardized procedures to evaluate the <strong>\u043f\u0440\u043e\u0447\u043d\u043e\u0441\u0442\u044c \u043f\u0440\u0438 \u0433\u043e\u0440\u044f\u0447\u0435\u043c \u0441\u0446\u0435\u043f\u043b\u0435\u043d\u0438\u0438<\/strong> of thermoplastic films and flexible webs immediately after heat sealing. This property is critical because seals often face mechanical stress before cooling during high-speed packaging operations such as form-fill-seal (FFS).<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Unlike conventional seal strength tests, ASTM F1921 focuses on <strong>seal performance in the molten or semi-molten state<\/strong>, providing insight into real production conditions. Engineers and quality control teams rely on ASTM F1921 to compare materials, optimize sealing parameters, and prevent premature seal failure.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">What is Hot Tack Strength?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u041f\u0440\u043e\u0447\u043d\u043e\u0441\u0442\u044c \u043f\u0440\u0438 \u0433\u043e\u0440\u044f\u0447\u0435\u043c \u0441\u0446\u0435\u043f\u043b\u0435\u043d\u0438\u0438<\/strong> measures the force required to separate a heat seal while it is still hot. This parameter directly affects packaging efficiency and product safety.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Why Use a Hot Seal Strength Tester?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">A <strong>hot seal strength tester<\/strong> performs controlled sealing and immediate tensile separation under defined conditions. It ensures:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Accurate simulation of industrial sealing processes<\/li>\n\n\n\n<li>Repeatable and standardized results<\/li>\n\n\n\n<li>Reliable comparison between materials<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Hot Tack Strength Test for Plastic Film Applications<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u0421\u0430\u0439\u0442 <strong>hot tack strength test for plastic film<\/strong> is widely applied in:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Multi-layer barrier films<\/li>\n\n\n\n<li>Laminated packaging structures<\/li>\n\n\n\n<li>Medical and pharmaceutical packaging<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">It helps determine the <strong>seal initiation temperature (SIT)<\/strong> and optimal sealing window, which are essential for process optimization.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Hot Tack Test Methods Defined in ASTM F1921<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">ASTM F1921 includes two primary test methods, both designed to measure seal strength immediately after sealing:<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">ASTM F1921 Method A (Fixed Delay)<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Measures hot tack strength at predefined cooling times<\/li>\n\n\n\n<li>Generates a <strong>cooling curve<\/strong> of seal strength versus time<\/li>\n\n\n\n<li>Suitable for detailed material characterization<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">ASTM F1921 Method B (Variable Delay)<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Applies a selected delay time before testing<\/li>\n\n\n\n<li>Records the <strong>maximum force during separation<\/strong><\/li>\n\n\n\n<li>Ideal for process-oriented testing and quick comparisons<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Both methods involve:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Controlled sealing temperature, pressure, and dwell time<\/li>\n\n\n\n<li>Automated separation of the sealed specimen<\/li>\n\n\n\n<li>Measurement of peel force until failure<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Key Parameters in Hot Tack Test<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">To achieve reliable ASTM F1921 results, operators must carefully control:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Sealing Temperature<\/strong><br>Typically tested across a range to generate a hot tack curve. The curve begins near the seal initiation temperature and increases incrementally.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u0412\u0440\u0435\u043c\u044f \u043f\u0440\u0435\u0431\u044b\u0432\u0430\u043d\u0438\u044f<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u226425 \u00b5m films: ~0.5 s<\/li>\n\n\n\n<li>25\u201364 \u00b5m films: ~1.0 s<\/li>\n\n\n\n<li>64 \u00b5m films: ~2.5 s<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u0414\u0430\u0432\u043b\u0435\u043d\u0438\u0435 \u0443\u043f\u043b\u043e\u0442\u043d\u0435\u043d\u0438\u044f<\/strong><br>Usually maintained between <strong>15\u201330 N\/cm\u00b2<\/strong>, ensuring proper interface bonding.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Separation Speed<\/strong><br>Affects measured force and must remain consistent for comparable results.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Failure Modes Observed in ASTM F1921 Testing<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Recording failure modes is essential for interpreting results. Common modes include:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Adhesive failure at the seal interface<\/li>\n\n\n\n<li>Cohesive failure within the material<\/li>\n\n\n\n<li>Delamination of layers<\/li>\n\n\n\n<li>Material break or elongation<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">These observations help identify whether failure originates from <strong>seal weakness or material structure issues<\/strong>.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Choosing the Right Hot Seal Strength Tester<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">A reliable <strong>hot seal strength tester<\/strong> must meet ASTM F1921 requirements and provide stable, repeatable results.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Cell Instruments offers advanced solutions such as the <strong><a href=\"https:\/\/www.materialstests.com\/ru\/hot-tack-tester.html\/\" target=\"_blank\" rel=\"noreferrer noopener\">\u0422\u0435\u0441\u0442\u0435\u0440 \u0433\u043e\u0440\u044f\u0447\u0435\u0433\u043e \u043a\u043b\u0435\u044f<\/a> (HTT series)<\/strong>, designed for precision and flexibility:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u0421\u0438\u0441\u0442\u0435\u043c\u0430 \u0441 \u041f\u041b\u041a-\u0443\u043f\u0440\u0430\u0432\u043b\u0435\u043d\u0438\u0435\u043c<\/strong> ensures consistent automation<\/li>\n\n\n\n<li><strong>High-accuracy temperature control (\u00b10.2\u00b0C)<\/strong> guarantees repeatability<\/li>\n\n\n\n<li>Supports both <strong>Method A and Method B<\/strong> \u0442\u0435\u0441\u0442\u0438\u0440\u043e\u0432\u0430\u043d\u0438\u0435<\/li>\n\n\n\n<li>Wide speed range accommodates various materials<\/li>\n\n\n\n<li>Integrated safety and calibration features<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">These capabilities allow laboratories and manufacturers to perform <strong>comprehensive hot tack strength test for plastic film<\/strong> with confidence.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u0412\u043e\u043f\u0440\u043e\u0441\u044b \u0438 \u043e\u0442\u0432\u0435\u0442\u044b<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>1. What is the difference between hot tack strength and seal strength?<\/strong><br>Hot tack strength measures seal integrity immediately after sealing, while seal strength evaluates fully cooled seals.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>2. Why is ASTM F1921 important for packaging?<\/strong><br>It simulates real packaging conditions where seals undergo stress before cooling, helping prevent failures.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>3. Which industries rely on <a href=\"https:\/\/store.astm.org\/f1921_f1921m-12r23.html\" target=\"_blank\" rel=\"noreferrer noopener\">ASTM F1921<\/a> \u0442\u0435\u0441\u0442\u0438\u0440\u043e\u0432\u0430\u043d\u0438\u0435?<\/strong><br>Food packaging, pharmaceuticals, medical devices, and flexible packaging industries widely use this standard.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>4. How do I select between Method A and Method B?<\/strong><br>Use Method A for detailed analysis and cooling curves; choose Method B for faster, process-oriented testing.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>5. What factors most influence hot tack strength?<\/strong><br>Sealing temperature, dwell time, pressure, and material composition significantly affect results.<\/p>","protected":false},"excerpt":{"rendered":"<p>\u0421\u0442\u0430\u043d\u0434\u0430\u0440\u0442 ASTM F1921 \u043e\u043f\u0440\u0435\u0434\u0435\u043b\u044f\u0435\u0442 \u0441\u0442\u0430\u043d\u0434\u0430\u0440\u0442\u0438\u0437\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u044b\u0435 \u043c\u0435\u0442\u043e\u0434\u044b \u0438\u0437\u043c\u0435\u0440\u0435\u043d\u0438\u044f \u043f\u0440\u043e\u0447\u043d\u043e\u0441\u0442\u0438 \u0442\u0435\u0440\u043c\u043e\u043f\u043b\u0430\u0441\u0442\u0438\u0447\u043d\u044b\u0445 \u043f\u043b\u0435\u043d\u043e\u043a \u043f\u0440\u0438 \u0433\u043e\u0440\u044f\u0447\u0435\u043c \u0441\u0445\u0432\u0430\u0442\u044b\u0432\u0430\u043d\u0438\u0438 \u0441\u0440\u0430\u0437\u0443 \u043f\u043e\u0441\u043b\u0435 \u0437\u0430\u043f\u0435\u0447\u0430\u0442\u044b\u0432\u0430\u043d\u0438\u044f. \u041e\u043d \u043e\u0446\u0435\u043d\u0438\u0432\u0430\u0435\u0442 \u0446\u0435\u043b\u043e\u0441\u0442\u043d\u043e\u0441\u0442\u044c \u0443\u043f\u043b\u043e\u0442\u043d\u0435\u043d\u0438\u044f \u0432 \u0440\u0435\u0430\u043b\u044c\u043d\u044b\u0445 \u043f\u0440\u043e\u0438\u0437\u0432\u043e\u0434\u0441\u0442\u0432\u0435\u043d\u043d\u044b\u0445 \u0443\u0441\u043b\u043e\u0432\u0438\u044f\u0445, \u0443\u0434\u0435\u043b\u044f\u044f \u043e\u0441\u043e\u0431\u043e\u0435 \u0432\u043d\u0438\u043c\u0430\u043d\u0438\u0435 \u0442\u0430\u043a\u0438\u043c \u043f\u0430\u0440\u0430\u043c\u0435\u0442\u0440\u0430\u043c, \u043a\u0430\u043a \u0442\u0435\u043c\u043f\u0435\u0440\u0430\u0442\u0443\u0440\u0430, \u0434\u0430\u0432\u043b\u0435\u043d\u0438\u0435 \u0438 \u0432\u0440\u0435\u043c\u044f \u0432\u044b\u0434\u0435\u0440\u0436\u043a\u0438.<\/p>","protected":false},"featured_media":3291,"parent":0,"template":"","meta":{"_acf_changed":false},"standard":[],"class_list":["post-3288","application","type-application","status-publish","has-post-thumbnail","hentry"],"acf":[],"_links":{"self":[{"href":"https:\/\/www.materialstests.com\/ru\/wp-json\/wp\/v2\/application\/3288","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.materialstests.com\/ru\/wp-json\/wp\/v2\/application"}],"about":[{"href":"https:\/\/www.materialstests.com\/ru\/wp-json\/wp\/v2\/types\/application"}],"version-history":[{"count":3,"href":"https:\/\/www.materialstests.com\/ru\/wp-json\/wp\/v2\/application\/3288\/revisions"}],"predecessor-version":[{"id":3292,"href":"https:\/\/www.materialstests.com\/ru\/wp-json\/wp\/v2\/application\/3288\/revisions\/3292"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.materialstests.com\/ru\/wp-json\/wp\/v2\/media\/3291"}],"wp:attachment":[{"href":"https:\/\/www.materialstests.com\/ru\/wp-json\/wp\/v2\/media?parent=3288"}],"wp:term":[{"taxonomy":"standard","embeddable":true,"href":"https:\/\/www.materialstests.com\/ru\/wp-json\/wp\/v2\/standard?post=3288"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}