{"id":30949,"date":"2026-06-23T02:00:08","date_gmt":"2026-06-23T02:00:08","guid":{"rendered":"https:\/\/hardnesstests.com\/?p=30949"},"modified":"2026-06-23T02:00:12","modified_gmt":"2026-06-23T02:00:12","slug":"coating-hardness-testing","status":"publish","type":"post","link":"https:\/\/hardnesstests.com\/de_de_formal\/coating-hardness-testing\/","title":{"rendered":"Coating Hardness Testing: Methods, Standards and Industrial Applications"},"content":{"rendered":"<h2 class=\"wp-block-heading\" id=\"h-introduction-to-coating-hardness-testing\"><strong>Introduction to Coating Hardness Testing<\/strong><\/h2>\n\n\n\n<p><strong>Coating hardness testing<\/strong> is an essential process used to evaluate the mechanical performance of protective, decorative, and functional coatings. Hardness is one of the most important coating properties because it directly influences wear resistance, scratch resistance, durability, and service life.<\/p>\n\n\n\n<p>Modern coatings are used in a wide range of industries, including automotive manufacturing, aerospace engineering, electronics, tooling, medical devices, and industrial equipment. To ensure these coatings perform as expected, manufacturers rely on coating hardness testing to verify quality, optimize production processes, and meet industry standards.<\/p>\n\n\n\n<p>Whether testing a thin PVD coating on a cutting tool or a protective paint layer on industrial machinery, coating hardness testing provides valuable insight into coating performance.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-what-is-coating-hardness-testing\"><strong>What Is Coating Hardness Testing?<\/strong><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-definition-and-purpose\"><strong>Definition und Zweck<\/strong><\/h3>\n\n\n\n<p><strong>Coating hardness testing<\/strong> is the process of measuring a coating&#8217;s resistance to indentation, penetration, scratching, or deformation under controlled conditions.<\/p>\n\n\n\n<p>The primary goals include:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Evaluating coating quality<\/li>\n\n\n\n<li>Verifying manufacturing consistency<\/li>\n\n\n\n<li>Comparing coating materials<\/li>\n\n\n\n<li>Supporting product development<\/li>\n\n\n\n<li>Assessing wear resistance<\/li>\n\n\n\n<li>Ensuring compliance with specifications<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-importance-of-coating-hardness\"><strong>Importance of Coating Hardness<\/strong><\/h3>\n\n\n\n<p>Hardness significantly affects:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/hardnesstests.com\/de_de_formal\/products\/\">Scratch resistance<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/hardnesstests.com\/de_de_formal\/products\/\">Abrasion resistance<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/hardnesstests.com\/de_de_formal\/products\/\">Impact performance<\/a><\/li>\n\n\n\n<li>Surface durability<\/li>\n\n\n\n<li>Service life<\/li>\n<\/ul>\n\n\n\n<p>A coating with insufficient hardness may fail prematurely, leading to increased maintenance costs and reduced product reliability.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<figure class=\"wp-block-image aligncenter size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"600\" height=\"800\" src=\"https:\/\/hardnesstests.com\/wp-content\/uploads\/2026\/01\/22-600x800.jpg\" alt=\"Coating hardness testing on thin film surface\" class=\"wp-image-30257\" srcset=\"https:\/\/hardnesstests.com\/wp-content\/uploads\/2026\/01\/22-600x800.jpg 600w, https:\/\/hardnesstests.com\/wp-content\/uploads\/2026\/01\/22-225x300.jpg 225w, https:\/\/hardnesstests.com\/wp-content\/uploads\/2026\/01\/22-9x12.jpg 9w, https:\/\/hardnesstests.com\/wp-content\/uploads\/2026\/01\/22-700x933.jpg 700w, https:\/\/hardnesstests.com\/wp-content\/uploads\/2026\/01\/22-150x200.jpg 150w, https:\/\/hardnesstests.com\/wp-content\/uploads\/2026\/01\/22.jpg 736w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-principles-of-coating-hardness-testing\"><strong>Principles of Coating Hardness Testing<\/strong><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-resistance-to-indentation-and-scratching\"><strong>Resistance to Indentation and Scratching<\/strong><\/h3>\n\n\n\n<p>Most coating hardness tests evaluate how effectively a coating resists permanent deformation caused by a specified force.<\/p>\n\n\n\n<p>Hard coatings generally:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Produce smaller indentations<\/li>\n\n\n\n<li>Resist scratching<\/li>\n\n\n\n<li>Exhibit better wear performance<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-relationship-between-hardness-and-durability\"><strong>Relationship Between Hardness and Durability<\/strong><\/h3>\n\n\n\n<p>Although hardness alone does not determine coating quality, it often correlates with:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Abriebfestigkeit<\/li>\n\n\n\n<li>Surface protection<\/li>\n\n\n\n<li>Langfristige Haltbarkeit<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-factors-affecting-coating-hardness\"><strong>Factors Affecting Coating Hardness<\/strong><\/h3>\n\n\n\n<p>Several variables influence hardness measurements:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Coating composition<\/li>\n\n\n\n<li>Thickness<\/li>\n\n\n\n<li>Curing process<\/li>\n\n\n\n<li>Surface finish<\/li>\n\n\n\n<li>Substrate properties<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-common-coating-hardness-testing-methods\"><strong>Common Coating Hardness Testing Methods<\/strong><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-vickers-coating-hardness-testing\"><strong>Vickers Coating Hardness Testing<\/strong><\/h3>\n\n\n\n<p>The Vickers method uses a diamond pyramid indenter to create a microscopic indentation.<\/p>\n\n\n\n<p>Zu den Vorteilen geh\u00f6ren:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Hohe Pr\u00e4zision<\/li>\n\n\n\n<li>Wide hardness range<\/li>\n\n\n\n<li>Suitable for many coating types<\/li>\n<\/ul>\n\n\n\n<p>Results are reported as HV values.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-knoop-coating-hardness-testing\"><strong>Knoop Coating Hardness Testing<\/strong><\/h3>\n\n\n\n<p>Knoop testing uses an elongated diamond indenter that creates a shallow indentation.<\/p>\n\n\n\n<p>Zu den Vorteilen geh\u00f6ren:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Ideal for thin coatings<\/li>\n\n\n\n<li>Reduced substrate influence<\/li>\n\n\n\n<li>Excellent for brittle coatings<\/li>\n<\/ul>\n\n\n\n<p>Results are reported as HK values.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-nanoindentation-testing\"><strong>Nanoindentation Testing<\/strong><\/h3>\n\n\n\n<p>Nanoindentation measures hardness at the nanometer scale and is widely used for:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Thin films<\/li>\n\n\n\n<li>PVD coatings<\/li>\n\n\n\n<li>CVD coatings<\/li>\n\n\n\n<li>Semiconductor materials<\/li>\n<\/ul>\n\n\n\n<p>It can also determine elastic modulus and other mechanical properties.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-pencil-hardness-testing\"><strong>Pencil Hardness Testing<\/strong><\/h3>\n\n\n\n<p>Pencil hardness testing evaluates scratch resistance using pencils of varying hardness grades.<\/p>\n\n\n\n<p>Commonly used for:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Paints<\/li>\n\n\n\n<li>Decorative coatings<\/li>\n\n\n\n<li>Consumer products<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-scratch-hardness-testing\"><strong>Scratch Hardness Testing<\/strong><\/h3>\n\n\n\n<p>Scratch testing measures the force required to damage or remove a coating.<\/p>\n\n\n\n<p>Die Anwendungen umfassen:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Adhesion evaluation<\/li>\n\n\n\n<li>Wear resistance assessment<\/li>\n\n\n\n<li>Coating qualification<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-coating-hardness-testing-equipment\"><strong>Coating Hardness Testing Equipment<\/strong><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-microhardness-testers\"><strong>Microhardness Testers<\/strong><\/h3>\n\n\n\n<p>Microhardness systems are commonly used for:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>D\u00fcnne Schichten<\/li>\n\n\n\n<li>Oberfl\u00e4chenbehandlungen<\/li>\n\n\n\n<li>Precision measurements<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-nanoindentation-systems\"><strong>Nanoindentation Systems<\/strong><\/h3>\n\n\n\n<p>Nanoindenters provide:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Ultra-low force control<\/li>\n\n\n\n<li>Nanometer-scale measurements<\/li>\n\n\n\n<li>Advanced material characterization<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-pencil-hardness-test-kits\"><strong>Pencil Hardness Test Kits<\/strong><\/h3>\n\n\n\n<p>These simple systems provide cost-effective hardness evaluation for paints and organic coatings.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-automated-hardness-testing-systems\"><strong>Automated Hardness Testing Systems<\/strong><\/h3>\n\n\n\n<p>Modern automated solutions offer:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Digital imaging<\/li>\n\n\n\n<li>Auto-focus capability<\/li>\n\n\n\n<li>Statistische Analyse<\/li>\n\n\n\n<li>Automated reporting<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-coating-hardness-testing-procedure\"><strong>Coating Hardness Testing Procedure<\/strong><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-sample-preparation\"><strong>Vorbereitung der Probe<\/strong><\/h3>\n\n\n\n<p>Proper preparation ensures accurate measurements.<\/p>\n\n\n\n<p>The surface should be:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Clean<\/li>\n\n\n\n<li>Dry<\/li>\n\n\n\n<li>Glatt<\/li>\n\n\n\n<li>Free from contaminants<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-selecting-the-appropriate-test-method\"><strong>Selecting the Appropriate Test Method<\/strong><\/h3>\n\n\n\n<p>Method selection depends on:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Coating thickness<\/li>\n\n\n\n<li>Material Typ<\/li>\n\n\n\n<li>Required accuracy<\/li>\n\n\n\n<li>Industry requirements<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-performing-the-test\"><strong>Performing the Test<\/strong><\/h3>\n\n\n\n<p>The selected indenter or test device applies a controlled force according to standardized procedures.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-analyzing-and-reporting-results\"><strong>Analyzing and Reporting Results<\/strong><\/h3>\n\n\n\n<p>Results are documented and compared against acceptance criteria or product specifications.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-factors-affecting-test-accuracy\"><strong>Factors Affecting Test Accuracy<\/strong><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-coating-thickness\"><strong>Coating Thickness<\/strong><\/h3>\n\n\n\n<p>Thin coatings require low-load methods to minimize substrate effects.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-surface-roughness\"><strong>Surface Roughness<\/strong><\/h3>\n\n\n\n<p>Rough surfaces can distort measurements and reduce repeatability.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-substrate-influence\"><strong>Substrate Influence<\/strong><\/h3>\n\n\n\n<p>The hardness of the underlying substrate may affect test results, especially for thin coatings.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-calibration-and-verification\"><strong>Calibration and Verification<\/strong><\/h3>\n\n\n\n<p>Routine calibration improves reliability and compliance.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-advantages-of-coating-hardness-testing\"><strong>Advantages of Coating Hardness Testing<\/strong><\/h2>\n\n\n\n<p>Coating hardness testing offers numerous benefits:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Supports quality control<\/li>\n\n\n\n<li>Improves coating selection<\/li>\n\n\n\n<li>Verifies manufacturing consistency<\/li>\n\n\n\n<li>Predicts wear performance<\/li>\n\n\n\n<li>Assists failure analysis<\/li>\n\n\n\n<li>Suitable for many coating types<\/li>\n\n\n\n<li>Widely standardized<\/li>\n<\/ul>\n\n\n\n<p>These advantages make hardness testing an essential part of coating evaluation.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-limitations-of-coating-hardness-testing\"><strong>Limitations of Coating Hardness Testing<\/strong><\/h2>\n\n\n\n<p>Despite its usefulness, limitations include:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Substrate influence on thin coatings<\/li>\n\n\n\n<li>Requires proper surface preparation<\/li>\n\n\n\n<li>Different methods use different scales<\/li>\n\n\n\n<li>Localized measurements only<\/li>\n\n\n\n<li>Specialized equipment may be costly<\/li>\n<\/ul>\n\n\n\n<p>Understanding these limitations helps ensure meaningful results.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<figure class=\"wp-block-image aligncenter size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"675\" height=\"800\" src=\"https:\/\/hardnesstests.com\/wp-content\/uploads\/2026\/05\/92-675x800.jpg\" alt=\"Coating hardness testing on thin film surface\" class=\"wp-image-30843\" srcset=\"https:\/\/hardnesstests.com\/wp-content\/uploads\/2026\/05\/92-675x800.jpg 675w, https:\/\/hardnesstests.com\/wp-content\/uploads\/2026\/05\/92-253x300.jpg 253w, https:\/\/hardnesstests.com\/wp-content\/uploads\/2026\/05\/92-10x12.jpg 10w, https:\/\/hardnesstests.com\/wp-content\/uploads\/2026\/05\/92-700x829.jpg 700w, https:\/\/hardnesstests.com\/wp-content\/uploads\/2026\/05\/92-150x178.jpg 150w, https:\/\/hardnesstests.com\/wp-content\/uploads\/2026\/05\/92.jpg 720w\" sizes=\"auto, (max-width: 675px) 100vw, 675px\" \/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-applications-of-hardness-testing\"><strong>Applications of Hardness Testing<\/strong><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-pvd-and-cvd-coatings\"><strong>PVD and CVD Coatings<\/strong><\/h3>\n\n\n\n<p>Used to evaluate:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Cutting tool coatings<\/li>\n\n\n\n<li>Wear-resistant surfaces<\/li>\n\n\n\n<li>Functional thin films<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-industrial-protective-coatings\"><strong>Industrial Protective Coatings<\/strong><\/h3>\n\n\n\n<p>Die Anwendungen umfassen:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Corrosion protection<\/li>\n\n\n\n<li>Industrial machinery<\/li>\n\n\n\n<li>Strukturelle Komponenten<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-automotive-finishes\"><strong>Automotive Finishes<\/strong><\/h3>\n\n\n\n<p>Manufacturers test:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Paint systems<\/li>\n\n\n\n<li>Clear coats<\/li>\n\n\n\n<li>Decorative finishes<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-aerospace-surface-treatments\"><strong>Aerospace Surface Treatments<\/strong><\/h3>\n\n\n\n<p>Aerospace coatings require strict hardness verification to ensure performance and durability.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-electronic-and-semiconductor-coatings\"><strong>Electronic and Semiconductor Coatings<\/strong><\/h3>\n\n\n\n<p>Nanoindentation is widely used for advanced electronic materials and thin-film technologies.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-industry-standards-and-compliance\"><strong>Industriestandards und Compliance<\/strong><\/h2>\n\n\n\n<p>Common standards for <strong>coating hardness testing<\/strong> include:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>ASTM E384<\/li>\n\n\n\n<li>ASTM D3363 (Pencil Hardness)<\/li>\n\n\n\n<li>ASTM C1327<\/li>\n\n\n\n<li>ISO 6507<\/li>\n\n\n\n<li>ISO 15184<\/li>\n\n\n\n<li>ISO 14577<\/li>\n<\/ul>\n\n\n\n<p>Official references:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/www.astm.org\/?utm_source=chatgpt.com\" target=\"_blank\" rel=\"noreferrer noopener\">ASTM International<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/www.iso.org\/?utm_source=chatgpt.com\" target=\"_blank\" rel=\"noreferrer noopener\">ISO Standards Organization<\/a><\/li>\n<\/ul>\n\n\n\n<p>Compliance ensures reliable and internationally recognized results.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-frequently-asked-questions\"><strong>H\u00e4ufig gestellte Fragen<\/strong><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-1-what-is-hardness-testing\"><strong>1. What is hardness testing?<\/strong><\/h3>\n\n\n\n<p>It is the process of measuring a coating&#8217;s resistance to indentation, scratching, or deformation.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-2-which-hardness-test-is-best-for-thin-coatings\"><strong>2. Which hardness test is best for thin coatings?<\/strong><\/h3>\n\n\n\n<p>Knoop testing and nanoindentation are commonly preferred for very thin coatings.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-3-what-is-pencil-hardness-testing-used-for\"><strong>3. What is pencil hardness testing used for?<\/strong><\/h3>\n\n\n\n<p>It is primarily used to evaluate the scratch resistance of paints and organic coatings.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-4-can-coating-hardness-testing-measure-wear-resistance\"><strong>4. Can coating hardness testing measure wear resistance?<\/strong><\/h3>\n\n\n\n<p>Hardness is often correlated with wear resistance, although additional testing may be required.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-5-why-does-substrate-hardness-matter\"><strong>5. Why does substrate hardness matter?<\/strong><\/h3>\n\n\n\n<p>For thin coatings, the substrate can influence indentation measurements and affect accuracy.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-6-which-industries-use-coating-hardness-testing\"><strong>6. Which industries use coating hardness testing?<\/strong><\/h3>\n\n\n\n<p>Automotive, aerospace, electronics, tooling, medical devices, and industrial manufacturing industries.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-conclusion\"><strong>Fazit<\/strong><\/h2>\n\n\n\n<p><strong>Coating hardness testing<\/strong> is a critical tool for evaluating the durability, wear resistance, and overall quality of coatings used in modern industries. By utilizing methods such as Vickers, Knoop, nanoindentation, pencil hardness, and scratch testing, engineers can verify coating performance and ensure products meet demanding operational requirements.<\/p>\n\n\n\n<p>As coating technologies continue to evolve, coating hardness testing will remain an essential part of quality control, materials development, and performance verification.<\/p>","protected":false},"excerpt":{"rendered":"<p>Introduction to Coating Hardness Testing Coating hardness testing is an essential process used to evaluate the mechanical performance of protective,<\/p>","protected":false},"author":4,"featured_media":30320,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[117],"tags":[147],"class_list":["post-30949","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-hardness-tester","tag-coating-hardness-testing"],"yoast_head":"<!-- This site is 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