{"id":208,"date":"2025-01-14T02:26:06","date_gmt":"2025-01-14T02:26:06","guid":{"rendered":"https:\/\/www.heatsealtest.com\/?page_id=208"},"modified":"2026-02-02T00:06:44","modified_gmt":"2026-02-02T00:06:44","slug":"astm-f88","status":"publish","type":"page","link":"https:\/\/www.heatsealtest.com\/id\/astm-f88","title":{"rendered":"ASTM F88"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-page\" data-elementor-id=\"208\" class=\"elementor elementor-208\" data-elementor-post-type=\"page\">\n\t\t\t\t<div class=\"elementor-element elementor-element-5674e52 e-con-full e-flex e-con e-parent\" data-id=\"5674e52\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t<div class=\"elementor-element elementor-element-f2adc8d e-con-full e-flex e-con e-child\" data-id=\"f2adc8d\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t<div class=\"elementor-element elementor-element-1426931 e-con-full e-flex e-con e-child\" data-id=\"1426931\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t<div class=\"elementor-element elementor-element-c463a64 e-con-full e-flex e-con e-child\" data-id=\"c463a64\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-43e5712 elementor-widget elementor-widget-heading\" data-id=\"43e5712\" 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<h1 class=\"elementor-heading-title elementor-size-default\">ASTM F88<\/h1>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-cf48666 elementor-widget elementor-widget-heading\" data-id=\"cf48666\" 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\">Seal Strength of Plastic Films<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-baf2b47 elementor-widget__width-initial elementor-widget elementor-widget-text-editor\" data-id=\"baf2b47\" 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>When it comes to packaging materials, ensuring that seals maintain their strength during transport and storage is critical. <a href=\"https:\/\/www.heatsealtest.com\/astm-f88\">ASTM F88<\/a>, a standard test method for the seal strength of flexible barrier materials, provides essential guidelines for accurately measuring the seal strength of flexible films. In industries such as food, medical, and pharmaceutical packaging, it is vital to confirm that seal integrity meets required standards to ensure product safety and quality.<\/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-28c7e6f elementor-button-align-stretch elementor-widget elementor-widget-form\" data-id=\"28c7e6f\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;button_width&quot;:&quot;20&quot;,&quot;step_next_label&quot;:&quot;Next&quot;,&quot;step_previous_label&quot;:&quot;Previous&quot;,&quot;step_type&quot;:&quot;number_text&quot;,&quot;step_icon_shape&quot;:&quot;circle&quot;}\" data-widget_type=\"form.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<form class=\"elementor-form\" method=\"post\" name=\"New Form\" aria-label=\"New Form\">\r\n\t\t\t<input type=\"hidden\" name=\"post_id\" value=\"208\"\/>\r\n\t\t\t<input type=\"hidden\" name=\"form_id\" value=\"28c7e6f\"\/>\r\n\t\t\t<input type=\"hidden\" name=\"referer_title\" value=\"Heat Seal Test\" \/>\r\n\r\n\t\t\t\r\n\t\t\t<div class=\"elementor-form-fields-wrapper elementor-labels-\">\r\n\t\t\t\t\t\t\t\t<div class=\"elementor-field-type-text elementor-field-group elementor-column elementor-field-group-name elementor-col-100 elementor-field-required\">\r\n\t\t\t\t\t\t\t\t\t\t\t\t<label for=\"form-field-name\" class=\"elementor-field-label elementor-screen-only\">\r\n\t\t\t\t\t\t\t\tName\t\t\t\t\t\t\t<\/label>\r\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t<input size=\"1\" type=\"text\" name=\"form_fields[name]\" id=\"form-field-name\" class=\"elementor-field elementor-size-sm  elementor-field-textual\" placeholder=\"Name\" required=\"required\">\r\n\t\t\t\t\t\t\t\t\t\t\t<\/div>\r\n\t\t\t\t\t\t\t\t<div class=\"elementor-field-type-text elementor-field-group elementor-column elementor-field-group-field_3a1a103 elementor-col-100\">\r\n\t\t\t\t\t\t\t\t\t\t\t\t<label for=\"form-field-field_3a1a103\" class=\"elementor-field-label elementor-screen-only\">\r\n\t\t\t\t\t\t\t\tCompany\t\t\t\t\t\t\t<\/label>\r\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t<input size=\"1\" type=\"text\" name=\"form_fields[field_3a1a103]\" id=\"form-field-field_3a1a103\" class=\"elementor-field elementor-size-sm  elementor-field-textual\" placeholder=\"Company\">\r\n\t\t\t\t\t\t\t\t\t\t\t<\/div>\r\n\t\t\t\t\t\t\t\t<div class=\"elementor-field-type-email elementor-field-group elementor-column elementor-field-group-email elementor-col-100 elementor-field-required\">\r\n\t\t\t\t\t\t\t\t\t\t\t\t<label for=\"form-field-email\" class=\"elementor-field-label elementor-screen-only\">\r\n\t\t\t\t\t\t\t\tEmail\t\t\t\t\t\t\t<\/label>\r\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t<input size=\"1\" type=\"email\" name=\"form_fields[email]\" id=\"form-field-email\" class=\"elementor-field elementor-size-sm  elementor-field-textual\" placeholder=\"Email\" required=\"required\">\r\n\t\t\t\t\t\t\t\t\t\t\t<\/div>\r\n\t\t\t\t\t\t\t\t<div class=\"elementor-field-type-textarea elementor-field-group elementor-column elementor-field-group-message elementor-col-100\">\r\n\t\t\t\t\t\t\t\t\t\t\t\t<label for=\"form-field-message\" class=\"elementor-field-label elementor-screen-only\">\r\n\t\t\t\t\t\t\t\tMessage\t\t\t\t\t\t\t<\/label>\r\n\t\t\t\t\t\t<textarea class=\"elementor-field-textual elementor-field  elementor-size-sm\" name=\"form_fields[message]\" id=\"form-field-message\" rows=\"4\" placeholder=\"Message\"><\/textarea>\t\t\t\t<\/div>\r\n\t\t\t\t\t\t\t\t<div class=\"elementor-field-type-recaptcha_v3 elementor-field-group elementor-column elementor-field-group-field_0f96082 elementor-col-100 recaptcha_v3-bottomright\">\r\n\t\t\t\t\t<div class=\"elementor-field\" id=\"form-field-field_0f96082\"><div class=\"elementor-g-recaptcha\" data-sitekey=\"6Lcar6MrAAAAAL9Pz42-0SmIdCeogSKNdnyqx6QR\" data-type=\"v3\" data-action=\"Form\" data-badge=\"bottomright\" data-size=\"invisible\"><\/div><\/div>\t\t\t\t<\/div>\r\n\t\t\t\t\t\t\t\t<div class=\"elementor-field-group elementor-column elementor-field-type-submit elementor-col-20 e-form__buttons\">\r\n\t\t\t\t\t<button class=\"elementor-button elementor-size-sm\" type=\"submit\">\r\n\t\t\t\t\t\t<span class=\"elementor-button-content-wrapper\">\r\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-button-text\">Send<\/span>\r\n\t\t\t\t\t\t\t\t\t\t\t\t\t<\/span>\r\n\t\t\t\t\t<\/button>\r\n\t\t\t\t<\/div>\r\n\t\t\t<\/div>\r\n\t\t<\/form>\r\n\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>\n\t\t<div class=\"elementor-element elementor-element-ca388cf e-con-full e-flex e-con e-child\" data-id=\"ca388cf\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-3dce652 e-flex e-con-boxed e-con e-parent\" data-id=\"3dce652\" 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-2e42f64 elementor-widget elementor-widget-heading\" data-id=\"2e42f64\" 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\">ASTM F88 - The Seal Strength Standard for Packaging Materials<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-05334cb elementor-widget elementor-widget-text-editor\" data-id=\"05334cb\" 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>ASTM F88 provides a standardized method for determining the seal strength of plastic films, such as plastic films used in packaging. This test is essential for process validation, process control, and ensuring packaging integrity during handling and transportation. The test focuses on the ability of sealed films to resist forces that may compromise the seal during real-world conditions.<\/p><p>The significance of seal strength extends beyond the ability to keep a package closed. A properly sealed package prevents contamination, moisture intrusion, and ensures the product inside maintains its integrity. This test method also plays a crucial role in determining the opening force of seals. For certain applications, it may be advantageous to limit the strength of the seal to ensure easy access for consumers while maintaining sufficient barrier protection.<\/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<div class=\"elementor-element elementor-element-7406239 e-flex e-con-boxed e-con e-parent\" data-id=\"7406239\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-4357d39 elementor-widget elementor-widget-heading\" data-id=\"4357d39\" 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\">Key Factors in Seal Strength Measurement According to ASTM F88<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-ced2304 elementor-widget elementor-widget-text-editor\" data-id=\"ced2304\" 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>ASTM F88 outlines several key factors that influence the accuracy of seal strength testing:<\/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-fff6f37 e-n-tabs-mobile elementor-widget elementor-widget-n-tabs\" data-id=\"fff6f37\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;tabs_justify_horizontal&quot;:&quot;start&quot;,&quot;horizontal_scroll&quot;:&quot;disable&quot;}\" data-widget_type=\"nested-tabs.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"e-n-tabs\" data-widget-number=\"268398391\" aria-label=\"Tabs. Open items with Enter or Space, close with Escape and navigate using the Arrow keys.\">\n\t\t\t<div class=\"e-n-tabs-heading\" role=\"tablist\">\n\t\t\t\t\t<button id=\"e-n-tab-title-2683983911\" data-tab-title-id=\"e-n-tab-title-2683983911\" class=\"e-n-tab-title\" aria-selected=\"true\" data-tab-index=\"1\" role=\"tab\" tabindex=\"0\" aria-controls=\"e-n-tab-content-2683983911\" style=\"--n-tabs-title-order: 1;\">\n\t\t\t\t\t\t<span class=\"e-n-tab-title-text\">\n\t\t\t\tTest Specimen Preparation\t\t\t<\/span>\n\t\t<\/button>\n\t\t\t\t<button id=\"e-n-tab-title-2683983912\" data-tab-title-id=\"e-n-tab-title-2683983912\" class=\"e-n-tab-title\" aria-selected=\"false\" data-tab-index=\"2\" role=\"tab\" tabindex=\"-1\" aria-controls=\"e-n-tab-content-2683983912\" style=\"--n-tabs-title-order: 2;\">\n\t\t\t\t\t\t<span class=\"e-n-tab-title-text\">\n\t\t\t\tTest Techniques\t\t\t<\/span>\n\t\t<\/button>\n\t\t\t\t<button id=\"e-n-tab-title-2683983913\" data-tab-title-id=\"e-n-tab-title-2683983913\" class=\"e-n-tab-title\" aria-selected=\"false\" data-tab-index=\"3\" role=\"tab\" tabindex=\"-1\" aria-controls=\"e-n-tab-content-2683983913\" style=\"--n-tabs-title-order: 3;\">\n\t\t\t\t\t\t<span class=\"e-n-tab-title-text\">\n\t\t\t\tTest Equipment\t\t\t<\/span>\n\t\t<\/button>\n\t\t\t\t\t<\/div>\n\t\t\t<div class=\"e-n-tabs-content\">\n\t\t\t\t<div id=\"e-n-tab-content-2683983911\" role=\"tabpanel\" aria-labelledby=\"e-n-tab-title-2683983911\" data-tab-index=\"1\" style=\"--n-tabs-title-order: 1;\" class=\"e-active elementor-element elementor-element-e3fac09 e-con-full e-flex e-con e-child\" data-id=\"e3fac09\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t<div class=\"elementor-element elementor-element-d16f15a e-flex e-con-boxed e-con e-child\" data-id=\"d16f15a\" 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-0563e2c elementor-widget elementor-widget-text-editor\" data-id=\"0563e2c\" 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 test requires the preparation of sealed specimens, where the seals are subject to tension until failure. Specimens are cut to specific dimensions, ensuring consistency in the test procedure. The dimensions of the seal area and sample size may vary depending on the material being tested, with the standard recommending precise control over the specimen\u2019s cut and seal.<\/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<\/div>\n\t\t<div id=\"e-n-tab-content-2683983912\" role=\"tabpanel\" aria-labelledby=\"e-n-tab-title-2683983912\" data-tab-index=\"2\" style=\"--n-tabs-title-order: 2;\" class=\" elementor-element elementor-element-db67f38 e-con-full e-flex e-con e-child\" data-id=\"db67f38\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t<div class=\"elementor-element elementor-element-f2cb4b9 e-flex e-con-boxed e-con e-child\" data-id=\"f2cb4b9\" 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-58d9831 elementor-widget elementor-widget-text-editor\" data-id=\"58d9831\" 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>ASTM F88 defines several test techniques for preparing specimens, such as unsupported, hand-supported, and rigidly supported samples. Each technique helps isolate variables such as bending forces that can influence the seal strength. Standardized usage of these techniques ensures comparability across tests.<\/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<\/div>\n\t\t<div id=\"e-n-tab-content-2683983913\" role=\"tabpanel\" aria-labelledby=\"e-n-tab-title-2683983913\" data-tab-index=\"3\" style=\"--n-tabs-title-order: 3;\" class=\" elementor-element elementor-element-f629399 e-con-full e-flex e-con e-child\" data-id=\"f629399\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t<div class=\"elementor-element elementor-element-73be46e e-flex e-con-boxed e-con e-child\" data-id=\"73be46e\" 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-470848d elementor-widget elementor-widget-text-editor\" data-id=\"470848d\" 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>To measure seal strength accurately, the test requires a tensile testing machine that can measure the force required to break the seal. The machine must have an adjustable rate of separation between grips and a consistent force measurement system. A modern tensile testing machine with a digital interface is recommended for precision in data recording and analysis.<\/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<\/div>\n\t\t\t\t\t<\/div>\n\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<div class=\"elementor-element elementor-element-3a59c93 e-flex e-con-boxed e-con e-parent\" data-id=\"3a59c93\" 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-c90499e elementor-widget elementor-widget-heading\" data-id=\"c90499e\" 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\">ASTM F88 Application - Heat Seal Strength Testing<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-14af60b elementor-widget elementor-widget-text-editor\" data-id=\"14af60b\" 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>One of the most critical applications of ASTM F88 is in heat seal strength testing for plastic films. This method tests how well a heat-sealed package holds together under tensile, an important factor in packaging design and manufacturing.<\/p><p>Heat seal strength testing involves applying heat and pressure to join plastic films. During testing, various factors such as temperature, pressure, and sealing time must be carefully controlled to ensure consistent results. The <a href=\"https:\/\/www.heatsealtest.com\/\" target=\"_blank\" rel=\"noopener\"><strong>Heat Seal Tester<\/strong><\/a>\u00a0from Cell Instruments are excellent tools for this type of testing. These devices allow precise control over sealing conditions, ensuring that each test is carried out with accuracy and repeatability.<\/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<div class=\"elementor-element elementor-element-e36e304 e-flex e-con-boxed e-con e-parent\" data-id=\"e36e304\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-2638e6d elementor-widget elementor-widget-heading\" data-id=\"2638e6d\" 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\">Interpreting Heat Seal Strength Testing Results<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-efb813e elementor-widget elementor-widget-text-editor\" data-id=\"efb813e\" 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>Once the heat seal test is completed, the tensile testing machine records the maximum force exerted before the seal breaks. The data is used to evaluate the heat seal\u2019s integrity and performance. The failure mode of the specimen\u2014whether the seal fails cohesively, adhesively, or through delamination\u2014also provides important insights into the seal\u2019s quality.<\/p><p>If the test strip peels apart in the seal area, this can indicate adhesive failure or delamination, requiring further examination. In some cases, the <strong>average peel force<\/strong> may be the most important measure of seal strength. The results guide manufacturers in adjusting their sealing processes to achieve the desired level of strength and durability.<\/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<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>ASTM F88 Seal Strength of Plastic Films When it comes to packaging materials, ensuring that seals maintain their strength during transport and storage is critical. ASTM F88, a standard test method for the seal strength of flexible barrier materials, provides essential guidelines for accurately measuring the seal strength of flexible films. In industries such as [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_acf_changed":false,"footnotes":""},"class_list":["post-208","page","type-page","status-publish","hentry"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.2 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>ASTM F88 - Seal Strength of Plastic Films<\/title>\n<meta name=\"description\" content=\"ASTM F88 is measuring seal strength for flexible materials. 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