{"id":616,"date":"2026-02-17T14:19:11","date_gmt":"2026-02-17T13:19:11","guid":{"rendered":"https:\/\/relaunch.k-labor.wp4.visual4.com\/?page_id=616"},"modified":"2026-05-07T11:07:21","modified_gmt":"2026-05-07T09:07:21","slug":"hardness-testing-of-metals-and-plastics","status":"publish","type":"page","link":"https:\/\/dekra.k-labor.de\/en\/hardness-testing-of-metals-and-plastics\/","title":{"rendered":"Hardness testing of metals and plastics."},"content":{"rendered":"\n<p>Hardness is the mechanical resistance that a material opposes to the mechanical penetration of a harder, softer or equally hard test specimen. Depending on the type of action, a distinction is made between different types of hardness.<br>The hardness test is an indispensable step in the quality assurance of a product within the various stages of the manufacturing process. Various test methods are available for testing the hardness of metals and plastics. Which hardness test method is suitable for your project depends, among other things, on the material to be measured.<\/p>\n\n\n\n<p>All hardness testing methods have a common basic principle:<br>A standardized test body \u2013 for example a diamond pyramid and diamond cone or hard metal ball \u2013 is pressed onto the surface of the material. Then the surface or the penetration depth of a test body is measured.<br>Hardness is often a good indicator of the tensile and wear properties of a material.<br>The definition of hardness differs from that of strength.<br>This represents the resistance of a material to deformation.<br>The hardness, along with strength, ductility, rigidity, fracture toughness, density and melting temperature, is one of the material properties.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Hardness testing of metals<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">Brinell hardness test (HB):<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>DIN EN ISO 6506-1 \u2013 Metallic materials \/ Brinell hardness test \/ Part 1: Test method<\/li>\n\n\n\n<li>ASTM E10 \u2013 Standard test method for Brinell hardness of metallic materials<\/li>\n<\/ul>\n\n\n\n<p>In the Brinell hardness test, a hard metal ball (tungsten carbide) with a specific ball diameter is pressed vertically into the surface of a specimen as an indenter under a defined force. We use the Brinell hardness test to check the hardness of ferrous and non-ferrous materials. However, the Brinell hardness test can only be used to test the hardness of soft to medium-hard workpieces.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Rockwell hardness test (HR):<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>DIN EN ISO 6508-1 \u2013 Metallic materials \/ Rockwell hardness test \/ Part 1: Test method<\/li>\n\n\n\n<li>ASTM E18 \u2013 Standard test method for Rockwell hardness of metallic materials<\/li>\n<\/ul>\n\n\n\n<p>In contrast to the hardness testing methods according to Brinell and Vickers, the Rockwell hardness of a material results from the penetration depth of an indenter (diamond cone) when a certain pre- and test force is applied.<br>This hardness test is used to check the hardness properties of ferrous materials, especially in the hardened state.<\/p>\n\n\n\n<p>The test body is preloaded with a specified test force into the surface of the workpiece to be tested. The depth of penetration of the test specimen at preload serves as the reference plane. The indenter is then subjected to the main load for a period of at least two and a maximum of six seconds. This is then removed again so that only the preload is effective.<\/p>\n\n\n\n<p>The measure of the Rockwell hardness of the material is the difference between the indentation depths before and after application of the main load. The Rockwell units are calculated from the indentation depth. The indentation depth of the specimen is determined with a dial gauge connected to the test probe.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Vickers hardness test (HV):<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>DIN EN ISO 2639 \u2013 Steel \/ Determination and testing of case hardening depth<\/li>\n\n\n\n<li>DIN EN 10328 \u2013 Iron and steel \/ Determination of hardening depth after surface hardening<\/li>\n\n\n\n<li>DIN EN ISO 18203 \u2013 Steel \/ Determination of the thickness of hardened surface layers<\/li>\n\n\n\n<li>DIN EN ISO 6507-1 \u2013 Metallic materials \/ Vickers hardness test \u2013 Part 1: Test method<\/li>\n\n\n\n<li>ASTM E92 \u2013 Standard test method for Vickers hardness of metallic materials<\/li>\n<\/ul>\n\n\n\n<p>In Vickers hardness testing (Vickers hardness), a diamond pyramid with a square base and a dihedral angle of 136\u00b0 is pressed vertically into the specimen under a defined force. The hardness measurement is used for testing the hardness properties of all metals.<\/p>\n\n\n\n<p>Vickers hardness measurement is particularly suitable for measurement with low test forces for thin and small parts, such as coatings or workpieces with surface treatment.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Knoop hardness test (HK):<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>DIN EN ISO 4545-1 \u2013 Metallic materials \/ Knoop hardness test \/ Part 1: Test method<\/li>\n\n\n\n<li>ASTM E384 \u2013 Standard test methods for Knoop and Vickers hardness of materials<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Hardness testing of elastomers and plastics<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Shore-A hardness test according to ISO 868 \u2013 Determination of indentation hardness with a durometer (Shore hardness)<\/li>\n\n\n\n<li>Shore-D hardness test according to ISO 868 \u2013 determination of indentation hardness with a durometer (Shore hardness)<\/li>\n\n\n\n<li>IRHD \u2013 hardness test according to ISO 48 \u2013 rubber, vulcanized or thermoplastic \/ determination of hardness (hardness between 10 IRHD and 100 IRHD)<\/li>\n<\/ul>\n\n\n\n<figure class=\"wp-block-gallery has-nested-images columns-default is-cropped wp-block-gallery-1 is-layout-flex wp-block-gallery-is-layout-flex\">\n<figure data-wp-context=\"{&quot;imageId&quot;:&quot;6a03952962f36&quot;}\" data-wp-interactive=\"core\/image\" data-wp-key=\"6a03952962f36\" class=\"wp-block-image size-large wp-lightbox-container\"><img loading=\"lazy\" decoding=\"async\" width=\"300\" height=\"243\" data-wp-class--hide=\"state.isContentHidden\" data-wp-class--show=\"state.isContentVisible\" data-wp-init=\"callbacks.setButtonStyles\" data-wp-on--click=\"actions.showLightbox\" data-wp-on--load=\"callbacks.setButtonStyles\" data-wp-on-window--resize=\"callbacks.setButtonStyles\" data-id=\"559\" src=\"https:\/\/dekra.k-labor.de\/wp-content\/uploads\/2026\/02\/haerteverlaufspruefung-in-einem-nietbolzen.jpg\" alt=\"\" class=\"wp-image-559\"\/><button\n\t\t\tclass=\"lightbox-trigger\"\n\t\t\ttype=\"button\"\n\t\t\taria-haspopup=\"dialog\"\n\t\t\taria-label=\"Enlarge\"\n\t\t\tdata-wp-init=\"callbacks.initTriggerButton\"\n\t\t\tdata-wp-on--click=\"actions.showLightbox\"\n\t\t\tdata-wp-style--right=\"state.imageButtonRight\"\n\t\t\tdata-wp-style--top=\"state.imageButtonTop\"\n\t\t>\n\t\t\t<svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"12\" height=\"12\" fill=\"none\" viewBox=\"0 0 12 12\">\n\t\t\t\t<path fill=\"#fff\" d=\"M2 0a2 2 0 0 0-2 2v2h1.5V2a.5.5 0 0 1 .5-.5h2V0H2Zm2 10.5H2a.5.5 0 0 1-.5-.5V8H0v2a2 2 0 0 0 2 2h2v-1.5ZM8 12v-1.5h2a.5.5 0 0 0 .5-.5V8H12v2a2 2 0 0 1-2 2H8Zm2-12a2 2 0 0 1 2 2v2h-1.5V2a.5.5 0 0 0-.5-.5H8V0h2Z\" \/>\n\t\t\t<\/svg>\n\t\t<\/button><figcaption class=\"wp-element-caption\">Hardness progression test in a rivet bolt<\/figcaption><\/figure>\n\n\n\n<figure data-wp-context=\"{&quot;imageId&quot;:&quot;6a03952963280&quot;}\" data-wp-interactive=\"core\/image\" data-wp-key=\"6a03952963280\" class=\"wp-block-image size-large wp-lightbox-container\"><img loading=\"lazy\" decoding=\"async\" width=\"300\" height=\"223\" data-wp-class--hide=\"state.isContentHidden\" data-wp-class--show=\"state.isContentVisible\" data-wp-init=\"callbacks.setButtonStyles\" data-wp-on--click=\"actions.showLightbox\" data-wp-on--load=\"callbacks.setButtonStyles\" data-wp-on-window--resize=\"callbacks.setButtonStyles\" data-id=\"560\" src=\"https:\/\/dekra.k-labor.de\/wp-content\/uploads\/2026\/02\/haerteverlaufspuefung-in-einer-schweissnaht.jpg\" alt=\"\" class=\"wp-image-560\"\/><button\n\t\t\tclass=\"lightbox-trigger\"\n\t\t\ttype=\"button\"\n\t\t\taria-haspopup=\"dialog\"\n\t\t\taria-label=\"Enlarge\"\n\t\t\tdata-wp-init=\"callbacks.initTriggerButton\"\n\t\t\tdata-wp-on--click=\"actions.showLightbox\"\n\t\t\tdata-wp-style--right=\"state.imageButtonRight\"\n\t\t\tdata-wp-style--top=\"state.imageButtonTop\"\n\t\t>\n\t\t\t<svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"12\" height=\"12\" fill=\"none\" viewBox=\"0 0 12 12\">\n\t\t\t\t<path fill=\"#fff\" d=\"M2 0a2 2 0 0 0-2 2v2h1.5V2a.5.5 0 0 1 .5-.5h2V0H2Zm2 10.5H2a.5.5 0 0 1-.5-.5V8H0v2a2 2 0 0 0 2 2h2v-1.5ZM8 12v-1.5h2a.5.5 0 0 0 .5-.5V8H12v2a2 2 0 0 1-2 2H8Zm2-12a2 2 0 0 1 2 2v2h-1.5V2a.5.5 0 0 0-.5-.5H8V0h2Z\" \/>\n\t\t\t<\/svg>\n\t\t<\/button><figcaption class=\"wp-element-caption\">Hardness progression test in a weld seam<\/figcaption><\/figure>\n<\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">FAQ<\/h2>\n\n\n\n<div data-wp-context=\"{ &quot;autoclose&quot;: false, &quot;accordionItems&quot;: [] }\" data-wp-interactive=\"core\/accordion\" role=\"group\" class=\"wp-block-accordion is-layout-flow wp-block-accordion-is-layout-flow\">\n<div data-wp-class--is-open=\"state.isOpen\" data-wp-context=\"{ &quot;id&quot;: &quot;accordion-item-2&quot;, &quot;openByDefault&quot;: false }\" data-wp-init=\"callbacks.initAccordionItems\" data-wp-on-window--hashchange=\"callbacks.hashChange\" class=\"wp-block-accordion-item is-layout-flow wp-block-accordion-item-is-layout-flow\">\n<h3 class=\"wp-block-accordion-heading\"><button aria-expanded=\"false\" aria-controls=\"accordion-item-2-panel\" data-wp-bind--aria-expanded=\"state.isOpen\" data-wp-on--click=\"actions.toggle\" data-wp-on--keydown=\"actions.handleKeyDown\" id=\"accordion-item-2\" type=\"button\" class=\"wp-block-accordion-heading__toggle\"><span class=\"wp-block-accordion-heading__toggle-title\"><strong>What sample size do you need for hardness testing?<\/strong><\/span><span class=\"wp-block-accordion-heading__toggle-icon\" aria-hidden=\"true\">+<\/span><\/button><\/h3>\n\n\n\n<div inert aria-labelledby=\"accordion-item-2\" data-wp-bind--inert=\"!state.isOpen\" id=\"accordion-item-2-panel\" role=\"region\" class=\"wp-block-accordion-panel is-layout-flow wp-block-accordion-panel-is-layout-flow\">\n<p>At least 10 \u00d7 10 mm of flat surface; for hardness profiles or case hardening depth, a cross-section of a component is sufficient. The back of the sample must lie flat. For plastics (Shore, ball) test surfaces of at least 30 \u00d7 30 mm and 4 mm thickness.<\/p>\n<\/div>\n<\/div>\n<\/div>\n\n\n\n<div data-wp-context=\"{ &quot;autoclose&quot;: false, &quot;accordionItems&quot;: [] }\" data-wp-interactive=\"core\/accordion\" role=\"group\" class=\"wp-block-accordion is-layout-flow wp-block-accordion-is-layout-flow\">\n<div data-wp-class--is-open=\"state.isOpen\" data-wp-context=\"{ &quot;id&quot;: &quot;accordion-item-3&quot;, &quot;openByDefault&quot;: false }\" data-wp-init=\"callbacks.initAccordionItems\" data-wp-on-window--hashchange=\"callbacks.hashChange\" class=\"wp-block-accordion-item is-layout-flow wp-block-accordion-item-is-layout-flow\">\n<h3 class=\"wp-block-accordion-heading\"><button aria-expanded=\"false\" aria-controls=\"accordion-item-3-panel\" data-wp-bind--aria-expanded=\"state.isOpen\" data-wp-on--click=\"actions.toggle\" data-wp-on--keydown=\"actions.handleKeyDown\" id=\"accordion-item-3\" type=\"button\" class=\"wp-block-accordion-heading__toggle\"><span class=\"wp-block-accordion-heading__toggle-title\"><strong>How long does the test take?<\/strong><\/span><span class=\"wp-block-accordion-heading__toggle-icon\" aria-hidden=\"true\">+<\/span><\/button><\/h3>\n\n\n\n<div inert aria-labelledby=\"accordion-item-3\" data-wp-bind--inert=\"!state.isOpen\" id=\"accordion-item-3-panel\" role=\"region\" class=\"wp-block-accordion-panel is-layout-flow wp-block-accordion-panel-is-layout-flow\">\n<p>Individual tests within 2\u20135 working days. Hardness profiles with preparation 1 week. Express service possible.<\/p>\n<\/div>\n<\/div>\n<\/div>\n\n\n\n<div data-wp-context=\"{ &quot;autoclose&quot;: false, &quot;accordionItems&quot;: [] }\" data-wp-interactive=\"core\/accordion\" role=\"group\" class=\"wp-block-accordion is-layout-flow wp-block-accordion-is-layout-flow\">\n<div data-wp-class--is-open=\"state.isOpen\" data-wp-context=\"{ &quot;id&quot;: &quot;accordion-item-4&quot;, &quot;openByDefault&quot;: false }\" data-wp-init=\"callbacks.initAccordionItems\" data-wp-on-window--hashchange=\"callbacks.hashChange\" class=\"wp-block-accordion-item is-layout-flow wp-block-accordion-item-is-layout-flow\">\n<h3 class=\"wp-block-accordion-heading\"><button aria-expanded=\"false\" aria-controls=\"accordion-item-4-panel\" data-wp-bind--aria-expanded=\"state.isOpen\" data-wp-on--click=\"actions.toggle\" data-wp-on--keydown=\"actions.handleKeyDown\" id=\"accordion-item-4\" type=\"button\" class=\"wp-block-accordion-heading__toggle\"><span class=\"wp-block-accordion-heading__toggle-title\"><strong>Where do I send the samples?<\/strong><\/span><span class=\"wp-block-accordion-heading__toggle-icon\" aria-hidden=\"true\">+<\/span><\/button><\/h3>\n\n\n\n<div inert aria-labelledby=\"accordion-item-4\" data-wp-bind--inert=\"!state.isOpen\" id=\"accordion-item-4-panel\" role=\"region\" class=\"wp-block-accordion-panel is-layout-flow wp-block-accordion-panel-is-layout-flow\">\n<p>Dekra Automobil GmbH, Unidekstra\u00dfe 5, 75015 Bretten, <\/p>\n\n\n\n<p>with the sample accompanying form from the download area. Please state the desired hardness method (HB, HV, HRC, Shore A\/D) and standard.<\/p>\n<\/div>\n<\/div>\n<\/div>\n\n\n\n<div data-wp-context=\"{ &quot;autoclose&quot;: false, &quot;accordionItems&quot;: [] }\" data-wp-interactive=\"core\/accordion\" role=\"group\" class=\"wp-block-accordion is-layout-flow wp-block-accordion-is-layout-flow\">\n<div data-wp-class--is-open=\"state.isOpen\" data-wp-context=\"{ &quot;id&quot;: &quot;accordion-item-5&quot;, &quot;openByDefault&quot;: false }\" data-wp-init=\"callbacks.initAccordionItems\" data-wp-on-window--hashchange=\"callbacks.hashChange\" class=\"wp-block-accordion-item is-layout-flow wp-block-accordion-item-is-layout-flow\">\n<h3 class=\"wp-block-accordion-heading\"><button aria-expanded=\"false\" aria-controls=\"accordion-item-5-panel\" data-wp-bind--aria-expanded=\"state.isOpen\" data-wp-on--click=\"actions.toggle\" data-wp-on--keydown=\"actions.handleKeyDown\" id=\"accordion-item-5\" type=\"button\" class=\"wp-block-accordion-heading__toggle\"><span class=\"wp-block-accordion-heading__toggle-title\"><strong>Are hardness tests accredited?<\/strong><\/span><span class=\"wp-block-accordion-heading__toggle-icon\" aria-hidden=\"true\">+<\/span><\/button><\/h3>\n\n\n\n<div inert aria-labelledby=\"accordion-item-5\" data-wp-bind--inert=\"!state.isOpen\" id=\"accordion-item-5-panel\" role=\"region\" class=\"wp-block-accordion-panel is-layout-flow wp-block-accordion-panel-is-layout-flow\">\n<p>Yes, Brinell in accordance with DIN EN ISO 6506, Vickers in accordance with DIN EN ISO 6507, Rockwell in accordance with DIN EN ISO 6508, Knoop in accordance with DIN EN ISO 4545 as well as hardness profiles in accordance with DIN 6773 \/ ISO 15787 are DAkkS-accredited.<\/p>\n<\/div>\n<\/div>\n<\/div>\n\n\n\n<div data-wp-context=\"{ &quot;autoclose&quot;: false, &quot;accordionItems&quot;: [] }\" data-wp-interactive=\"core\/accordion\" role=\"group\" class=\"wp-block-accordion is-layout-flow wp-block-accordion-is-layout-flow\">\n<div data-wp-class--is-open=\"state.isOpen\" data-wp-context=\"{ &quot;id&quot;: &quot;accordion-item-6&quot;, &quot;openByDefault&quot;: false }\" data-wp-init=\"callbacks.initAccordionItems\" data-wp-on-window--hashchange=\"callbacks.hashChange\" class=\"wp-block-accordion-item is-layout-flow wp-block-accordion-item-is-layout-flow\">\n<h3 class=\"wp-block-accordion-heading\"><button aria-expanded=\"false\" aria-controls=\"accordion-item-6-panel\" data-wp-bind--aria-expanded=\"state.isOpen\" data-wp-on--click=\"actions.toggle\" data-wp-on--keydown=\"actions.handleKeyDown\" id=\"accordion-item-6\" type=\"button\" class=\"wp-block-accordion-heading__toggle\"><span class=\"wp-block-accordion-heading__toggle-title\"><strong>May hardness values be used in data sheets for advertising?<\/strong><\/span><span class=\"wp-block-accordion-heading__toggle-icon\" aria-hidden=\"true\">+<\/span><\/button><\/h3>\n\n\n\n<div inert aria-labelledby=\"accordion-item-6\" data-wp-bind--inert=\"!state.isOpen\" id=\"accordion-item-6-panel\" role=\"region\" class=\"wp-block-accordion-panel is-layout-flow wp-block-accordion-panel-is-layout-flow\">\n<p>Yes, stating the hardness method and the test force (e.g. &#8220;210 HV10&#8221;). Without this information, the values would be ambiguous.<\/p>\n<\/div>\n<\/div>\n<\/div>\n\n\n\n<div data-wp-context=\"{ &quot;autoclose&quot;: false, &quot;accordionItems&quot;: [] }\" data-wp-interactive=\"core\/accordion\" role=\"group\" class=\"wp-block-accordion is-layout-flow wp-block-accordion-is-layout-flow\">\n<div data-wp-class--is-open=\"state.isOpen\" data-wp-context=\"{ &quot;id&quot;: &quot;accordion-item-7&quot;, &quot;openByDefault&quot;: false }\" data-wp-init=\"callbacks.initAccordionItems\" data-wp-on-window--hashchange=\"callbacks.hashChange\" class=\"wp-block-accordion-item is-layout-flow wp-block-accordion-item-is-layout-flow\">\n<h3 class=\"wp-block-accordion-heading\"><button aria-expanded=\"false\" aria-controls=\"accordion-item-7-panel\" data-wp-bind--aria-expanded=\"state.isOpen\" data-wp-on--click=\"actions.toggle\" data-wp-on--keydown=\"actions.handleKeyDown\" id=\"accordion-item-7\" type=\"button\" class=\"wp-block-accordion-heading__toggle\"><span class=\"wp-block-accordion-heading__toggle-title\"><strong>Which hardness method is suitable for my material?<\/strong><\/span><span class=\"wp-block-accordion-heading__toggle-icon\" aria-hidden=\"true\">+<\/span><\/button><\/h3>\n\n\n\n<div inert aria-labelledby=\"accordion-item-7\" data-wp-bind--inert=\"!state.isOpen\" id=\"accordion-item-7-panel\" role=\"region\" class=\"wp-block-accordion-panel is-layout-flow wp-block-accordion-panel-is-layout-flow\">\n<p>HRC or HV is suitable for hardened steels, HB for softer metals. Micro-HV for surface layers and hardness profiles. For plastics, Shore A (soft) \/ Shore D (hard) or ball indentation. We are happy to advise you on the choice.<\/p>\n<\/div>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Hardness is the mechanical resistance that a material opposes to the mechanical penetration of a harder, softer or equally hard test specimen. Depending on the type of action, a distinction is made between different types of hardness.The hardness test is an indispensable step in the quality assurance of a product within the various stages of [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":918,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-616","page","type-page","status-publish","has-post-thumbnail","hentry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Hardness testing of metals and plastics. - k-labor<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/dekra.k-labor.de\/haertepruefung-von-metallen-kunststoffen\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Hardness testing of metals and plastics. - k-labor\" \/>\n<meta property=\"og:description\" content=\"Hardness is the mechanical resistance that a material opposes to the mechanical penetration of a harder, softer or equally hard test specimen. 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