{"id":7624,"date":"2026-03-11T11:30:23","date_gmt":"2026-03-11T03:30:23","guid":{"rendered":"http:\/\/www.camcjsw-testmachines.com\/?p=7624"},"modified":"2026-03-19T11:08:11","modified_gmt":"2026-03-19T03:08:11","slug":"industry-standard-plastics-astm-d790","status":"publish","type":"post","link":"http:\/\/www.camcjsw-testmachines.com\/es\/industry-standard-plastics-astm-d790\/","title":{"rendered":"Industry Standard &#8211; Plastics &#8211; ASTM D790"},"content":{"rendered":"<div data-elementor-type=\"wp-post\" data-elementor-id=\"7624\" class=\"elementor elementor-7624\" data-elementor-post-type=\"post\">\n\t\t\t\t<div class=\"elementor-element elementor-element-c870e61 e-flex e-con-boxed e-con e-parent\" data-id=\"c870e61\" 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-4b722c5 elementor-widget elementor-widget-heading\" data-id=\"4b722c5\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t<style>\/*! elementor - v3.22.0 - 26-06-2024 *\/\n.elementor-heading-title{padding:0;margin:0;line-height:1}.elementor-widget-heading .elementor-heading-title[class*=elementor-size-]>a{color:inherit;font-size:inherit;line-height:inherit}.elementor-widget-heading .elementor-heading-title.elementor-size-small{font-size:15px}.elementor-widget-heading .elementor-heading-title.elementor-size-medium{font-size:19px}.elementor-widget-heading .elementor-heading-title.elementor-size-large{font-size:29px}.elementor-widget-heading .elementor-heading-title.elementor-size-xl{font-size:39px}.elementor-widget-heading .elementor-heading-title.elementor-size-xxl{font-size:59px}<\/style><h4 class=\"elementor-heading-title elementor-size-default\">ASTM D790 3-Point Flexure Test on Plastics<\/h4>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-8f9f90e elementor-widget elementor-widget-text-editor\" data-id=\"8f9f90e\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t<style>\/*! elementor - v3.22.0 - 26-06-2024 *\/\n.elementor-widget-text-editor.elementor-drop-cap-view-stacked .elementor-drop-cap{background-color:#69727d;color:#fff}.elementor-widget-text-editor.elementor-drop-cap-view-framed .elementor-drop-cap{color:#69727d;border:3px solid;background-color:transparent}.elementor-widget-text-editor:not(.elementor-drop-cap-view-default) .elementor-drop-cap{margin-top:8px}.elementor-widget-text-editor:not(.elementor-drop-cap-view-default) .elementor-drop-cap-letter{width:1em;height:1em}.elementor-widget-text-editor .elementor-drop-cap{float:left;text-align:center;line-height:1;font-size:50px}.elementor-widget-text-editor .elementor-drop-cap-letter{display:inline-block}<\/style>\t\t\t\t<p>The ASTM D790 standard describes a test method used to determine the flexural properties of unreinforced and reinforced plastics, including high modulus composites and electrical insulating materials. Typical test results according to ASTM D790 include the flexural modulus, stresses and strains at the yield point, the flexural strength and the flexural strain at break. The tests are used for rigid and semi-rigid plastics, however only up to a 5% strain limit.<\/p><p>\u00a0<\/p><p><strong><b>Objective &amp; characteristic values of ASTM D790<\/b><\/strong><\/p><p>The\u00a03-point flexure test\u00a0to\u00a0ASTM D790\u00a0is a traditional standardized characterization method for rigid and semi-rigid plastics. The flexural properties determined with these tests are of great importance to designers, engineers and material manufacturers to ensure that the plastic material used meets the requirements for its intended application.<\/p><p><strong><b>Flexural modulus:\u00a0<\/b><\/strong>The flexural modulus is a measure of the stiffness of the material and indicates how well it can resist flexural loads. The ASTM D790 standard provides three calculation methods for the flexural modulus, each of which leads to different results:<\/p><p>Tangent Modulus (Modulus of Elasticity): The ratio, within the elastic limit, of stress corresponding to strain<\/p><p>Secant Modulus: Ratio of stress to corresponding strain at any selected point on the stress-strain curve<\/p><p>Chord Modulus: Slope between two specified points on the stress-strain curve<\/p><p><strong><b>Flexural strength:<\/b><\/strong>\u00a0Flexural strength provides information about the maximum load that the material can withstand in flexure before it breaks.<\/p><p><strong><b>Flexural stress<\/b><\/strong>\u00a0at a specified flexural strain<\/p><p>Flexural stresses and flexural strains at the yield point and at specimen break.<\/p><p><img decoding=\"async\" src=\"http:\/\/www.camcjsw-testmachines.com\/wp-content\/uploads\/2026\/03\/ASTM-D790-1.webp\" alt=\"ASTM-D790-1\" \/>\u00a0<\/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<div class=\"elementor-element elementor-element-727fe64 e-flex e-con-boxed e-con e-parent\" data-id=\"727fe64\" 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-e3091a9 elementor-widget elementor-widget-heading\" data-id=\"e3091a9\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t<h4 class=\"elementor-heading-title elementor-size-default\">Specimens<\/h4>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-950db94 elementor-widget elementor-widget-text-editor\" data-id=\"950db94\" 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>Test specimens that are cut from sheets, plates,\u00a0or molded or extruded shapes,\u00a0or\u00a0molded\u00a0to the\u00a0desired\u00a0finished dimensions are acceptable. The actual dimensions used shall\u00a0be measured in\u00a0accordance\u00a0with Test\u00a0Methods\u00a0D5947.\u00a0The depth of the specimen shall be defined as the thickness of the material.\u00a0The\u00a0depth shall\u00a0not\u00a0exceed\u00a0width. The\u00a0cross\u00a0section of the\u00a0specimens shall\u00a0be\u00a0rectangular\u00a0with\u00a0opposite sides flat and parallel(60.2mm) and adjacent sides perpendicular along the full length of the specimen.<\/p><p>To test plastics according to ASTM D790, the specimens are produced by injection molding or machined from sheets, plates or molded parts by mechanical processing.<\/p><p>According to ASTM D790, test specimens with a cross-section of 3.2 mm x 12.7 mm and a length of 127 mm are usually used for plastic molding compounds. The specified thickness to support ratio of 16 leads to a support span of 51 mm. In addition, the standard defines a series of additional requirements for specimens with a thickness greater than 3.2 mm and less than 1.6 mm.<\/p><p>To test laminated thermosets and sheet materials for electrical insulation, the specimens may have to be machined to a thickness of 25.4 mm or 12.7 mm. If the shear strength is very low compared to the tensile strength, the thickness-to-support ratio must be increased to 32 or even 40 to avoid shear fractures.<\/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<div class=\"elementor-element elementor-element-f738d0e e-flex e-con-boxed e-con e-parent\" data-id=\"f738d0e\" 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-2a4afd7 elementor-widget elementor-widget-heading\" data-id=\"2a4afd7\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t<h4 class=\"elementor-heading-title elementor-size-default\">MEASURING AND SETTING SPAN<\/h4>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-8d4f842 elementor-widget elementor-widget-text-editor\" data-id=\"8d4f842\" 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>For flexural fixtures that have adjustable spans,it is important that the\u00a0span between the supports is maintained constantor the actual\u00a0measured\u00a0span is used\u00a0in the\u00a0calculation of\u00a0stress,\u00a0modulus,and strain.and the loading nose or noses are positioned and aligned properly with\u00a0respect to the supports. Some simple steps as follows can improve the repeatability\u00a0of your results when using these adjustable span fixtures.<\/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<div class=\"elementor-element elementor-element-989cf21 e-flex e-con-boxed e-con e-parent\" data-id=\"989cf21\" 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-53033c6 elementor-widget elementor-widget-heading\" data-id=\"53033c6\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t<h4 class=\"elementor-heading-title elementor-size-default\">MEASUREMENT OF SPAN<\/h4>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-2c473a7 elementor-widget elementor-widget-text-editor\" data-id=\"2c473a7\" 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>This technique is needed to ensure that the\u00a0correct span; not an estimated span,is used in the calculation of results.<\/p><p>Scribe a permanent line\u00a0or mark at the\u00a0exact\u00a0center of the support where the specimen makes complete contact. The type\u00a0of\u00a0mark depends\u00a0on\u00a0whether the supports are fixed\u00a0or \u00a0rotatable\u00a0(see\u00a0Figs.A2.1\u00a0and\u00a0A2.2).<\/p><p>Using a vernier caliper with pointed tips that is readable to\u00a0at\u00a0least\u00a00.1mm(0.004 in.),\u00a0measure\u00a0the\u00a0distance between the supports,and use this measurement of span in the calculations.<\/p><p><img decoding=\"async\" src=\"http:\/\/www.camcjsw-testmachines.com\/wp-content\/uploads\/2026\/03\/ASTM-D790-2.webp\" alt=\"ASTM-D790-2\" \/><\/p><p>Setting the\u00a0Span\u00a0and\u00a0Alignment\u00a0of\u00a0Loading\u00a0Nose(s)\u2014 To\u00a0ensure a consistent day-to-day setup of the span and ensure the alignment and proper positioning of the loading nose, simple jigs should be\u00a0manufactured\u00a0for each of the standard setups used.An example of a jig found to be useful is shown in Fig.A2.3.<\/p><p>\u00a0<img decoding=\"async\" src=\"http:\/\/www.camcjsw-testmachines.com\/wp-content\/uploads\/2026\/03\/ASTM-D790-3.webp\" alt=\"ASTM-D790-3\" \/><\/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 D790 3-Point Flexure Test on Plastics The ASTM D790 standard describes a test method used to determine the flexural properties of unreinforced and reinforced plastics, including high modulus composites and electrical insulating materials. Typical test results according to ASTM D790 include the flexural modulus, stresses and strains at the yield point, the flexural strength [&hellip;]<\/p>","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_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":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","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-opacity":"","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-opacity":"","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-opacity":"","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-opacity":"","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-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[41],"tags":[],"class_list":["post-7624","post","type-post","status-publish","format-standard","hentry","category-application"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v22.5 (Yoast SEO v22.9) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\r\n<title>Industry Standard - Plastics - ASTM D790 - SINOTEST, a brand of JIANGSU WALLONG-HSIN MACHINERY ENGINEERING CORPORATION LTD<\/title>\r\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\r\n<link rel=\"canonical\" href=\"http:\/\/www.camcjsw-testmachines.com\/es\/industry-standard-plastics-astm-d790\/\" \/>\r\n<meta property=\"og:locale\" content=\"es_ES\" \/>\r\n<meta property=\"og:type\" content=\"article\" \/>\r\n<meta property=\"og:title\" content=\"Industry Standard - Plastics - ASTM D790\" \/>\r\n<meta property=\"og:description\" content=\"ASTM D790 3-Point Flexure Test on Plastics The ASTM D790 standard describes a test method used to determine the flexural properties of unreinforced and reinforced plastics, including high modulus composites and electrical insulating materials. 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