{"id":30934,"date":"2026-06-16T04:25:31","date_gmt":"2026-06-16T04:25:31","guid":{"rendered":"https:\/\/hardnesstests.com\/?p=30934"},"modified":"2026-06-16T04:25:33","modified_gmt":"2026-06-16T04:25:33","slug":"durometer-hardness-test","status":"publish","type":"post","link":"https:\/\/hardnesstests.com\/de\/durometer-hardness-test\/","title":{"rendered":"Durometer Hardness Test: Complete Guide to Measuring Rubber and Plastic Hardness"},"content":{"rendered":"<h2 class=\"wp-block-heading\" id=\"h-introduction-to-the-durometer-hardness-test\"><strong>Introduction to the Durometer Hardness Test<\/strong><\/h2>\n\n\n\n<p>Die <strong>durometer hardness test<\/strong> is one of the most widely used methods for measuring the hardness of rubber, plastics, elastomers, silicone, and other flexible materials. The test provides a quick and reliable way to determine how resistant a material is to indentation, helping manufacturers maintain product consistency and performance.<\/p>\n\n\n\n<p>Because hardness directly affects flexibility, durability, wear resistance, and user experience, durometer testing has become a critical quality control process across numerous industries. From automotive seals and medical tubing to consumer products and industrial components, durometer hardness values help engineers select the right material for specific applications.<\/p>\n\n\n\n<p>The simplicity, speed, and portability of the durometer hardness test make it one of the most practical material evaluation methods available today.<\/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-a-durometer-hardness-test\"><strong>What Is a Durometer Hardness Test?<\/strong><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-definition-and-purpose\"><strong>Definition and Purpose<\/strong><\/h3>\n\n\n\n<p>A <strong>durometer hardness test<\/strong> measures a material&#8217;s resistance to indentation using a specialized instrument called a durometer. The test applies a standardized spring force through an indenter and records how deeply the indenter penetrates the material.<\/p>\n\n\n\n<p>The test is commonly used to:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Evaluate rubber hardness<\/li>\n\n\n\n<li>Measure plastic hardness<\/li>\n\n\n\n<li>Compare material formulations<\/li>\n\n\n\n<li>Verify manufacturing consistency<\/li>\n\n\n\n<li>Support product development<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-importance-in-material-testing\"><strong>Importance in Material Testing<\/strong><\/h3>\n\n\n\n<p>Hardness influences many material properties, including:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Elasticity<\/li>\n\n\n\n<li>Flexibility<\/li>\n\n\n\n<li>Abrasion resistance<\/li>\n\n\n\n<li>Widerstand gegen Kompression<\/li>\n\n\n\n<li>Product lifespan<\/li>\n<\/ul>\n\n\n\n<p>Accurate hardness measurements help ensure products meet performance and safety requirements.<\/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-how-a-durometer-hardness-test-works\"><strong>How a Durometer Hardness Test Works<\/strong><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-indentation-measurement-principle\"><strong>Indentation Measurement Principle<\/strong><\/h3>\n\n\n\n<p>The test measures the depth of indentation produced by a spring-loaded indenter.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Softer materials allow deeper penetration.<\/li>\n\n\n\n<li>Harder materials resist penetration.<\/li>\n<\/ul>\n\n\n\n<p>The resulting value is displayed on a hardness scale ranging from 0 to 100.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-components-of-a-durometer\"><strong>Components of a Durometer<\/strong><\/h3>\n\n\n\n<p>A typical durometer includes:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Indenter tip<\/li>\n\n\n\n<li>Calibrated spring mechanism<\/li>\n\n\n\n<li>Pressure foot<\/li>\n\n\n\n<li>Analog dial or digital display<\/li>\n<\/ul>\n\n\n\n<p>Each component is designed to provide repeatable and accurate measurements.<\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"700\" height=\"700\" src=\"https:\/\/hardnesstests.com\/wp-content\/uploads\/2026\/05\/90.jpg\" alt=\"Durometer hardness test on rubber material\" class=\"wp-image-30837\" srcset=\"https:\/\/hardnesstests.com\/wp-content\/uploads\/2026\/05\/90.jpg 700w, https:\/\/hardnesstests.com\/wp-content\/uploads\/2026\/05\/90-300x300.jpg 300w, https:\/\/hardnesstests.com\/wp-content\/uploads\/2026\/05\/90-150x150.jpg 150w, https:\/\/hardnesstests.com\/wp-content\/uploads\/2026\/05\/90-12x12.jpg 12w, https:\/\/hardnesstests.com\/wp-content\/uploads\/2026\/05\/90-400x400.jpg 400w\" sizes=\"auto, (max-width: 700px) 100vw, 700px\" \/><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-understanding-hardness-readings\"><strong>Understanding Hardness Readings<\/strong><\/h3>\n\n\n\n<p>Hardness values are reported using Shore scales.<\/p>\n\n\n\n<p>Examples include:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Shore A 30 = soft rubber<\/li>\n\n\n\n<li>Shore A 70 = medium-hard rubber<\/li>\n\n\n\n<li>Shore D 80 = hard plastic<\/li>\n<\/ul>\n\n\n\n<p>Higher numbers indicate greater hardness.<\/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-types-of-durometer-hardness-scales\"><strong>Types of Durometer Hardness Scales<\/strong><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-shore-a-durometer-scale\"><strong>Shore A Durometer Scale<\/strong><\/h3>\n\n\n\n<p>The Shore A scale is used for softer materials such as:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Rubber<\/li>\n\n\n\n<li>Silicone<\/li>\n\n\n\n<li>Elastomers<\/li>\n\n\n\n<li>Flexible plastics<\/li>\n<\/ul>\n\n\n\n<p>Typical Shore A ranges:<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Material<\/th><th>Shore A<\/th><\/tr><\/thead><tbody><tr><td>Gel Materials<\/td><td>10\u201320<\/td><\/tr><tr><td>Silicone Rubber<\/td><td>20\u201350<\/td><\/tr><tr><td>Tire Rubber<\/td><td>60\u201375<\/td><\/tr><tr><td>Hard Rubber<\/td><td>80\u201395<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-shore-d-durometer-scale\"><strong>Shore D Durometer Scale<\/strong><\/h3>\n\n\n\n<p>The Shore D scale measures harder materials such as:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Nylon<\/li>\n\n\n\n<li>Polycarbonate<\/li>\n\n\n\n<li>Hard thermoplastics<\/li>\n<\/ul>\n\n\n\n<p>Typical Shore D ranges:<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Material<\/th><th>Shore D<\/th><\/tr><\/thead><tbody><tr><td>Polyethylene<\/td><td>50\u201365<\/td><\/tr><tr><td>Nylon<\/td><td>70\u201385<\/td><\/tr><tr><td>Polycarbonate<\/td><td>75\u201390<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-shore-oo-and-other-specialty-scales\"><strong>Shore OO and Other Specialty Scales<\/strong><\/h3>\n\n\n\n<p>Specialized scales include:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Shore OO<\/li>\n\n\n\n<li>Shore O<\/li>\n\n\n\n<li>Shore B<\/li>\n\n\n\n<li>Shore C<\/li>\n\n\n\n<li>Shore M<\/li>\n<\/ul>\n\n\n\n<p>These scales are used for foams, gels, and specialty materials.<\/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-durometer-hardness-test-procedure\"><strong>Durometer Hardness Test 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>For reliable measurements:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Clean the sample surface<\/li>\n\n\n\n<li>Ensure sufficient thickness<\/li>\n\n\n\n<li>Use a flat testing area<\/li>\n\n\n\n<li>Condition the material properly<\/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 durometer is placed perpendicular to the material surface.<\/p>\n\n\n\n<p>The operator applies steady pressure until full contact is achieved.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-recording-and-averaging-results\"><strong>Recording and Averaging Results<\/strong><\/h3>\n\n\n\n<p>Multiple measurements should be taken at different locations.<\/p>\n\n\n\n<p>The average value provides the most reliable hardness assessment.<\/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-equipment-used-for-durometer-hardness-testing\"><strong>Equipment Used for Durometer Hardness Testing<\/strong><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-analog-durometers\"><strong>Analog Durometers<\/strong><\/h3>\n\n\n\n<p>Traditional analog models feature:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Mechanical dial indicators<\/li>\n\n\n\n<li>Einfache Bedienung<\/li>\n\n\n\n<li>Cost-effective design<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-digital-durometers\"><strong>Digital Durometers<\/strong><\/h3>\n\n\n\n<p>Modern digital devices offer:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>High-resolution displays<\/li>\n\n\n\n<li>Data storage<\/li>\n\n\n\n<li>Statistical calculations<\/li>\n\n\n\n<li>USB connectivity<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-test-stands-and-fixtures\"><strong>Test Stands and Fixtures<\/strong><\/h3>\n\n\n\n<p>Test stands help improve:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Repeatability<\/li>\n\n\n\n<li>Operator consistency<\/li>\n\n\n\n<li>Measurement accuracy<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-calibration-blocks\"><strong>Calibration Blocks<\/strong><\/h3>\n\n\n\n<p>Calibration blocks verify instrument accuracy and support compliance with industry standards.<\/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-the-durometer-hardness-test\"><strong>Advantages of the Durometer Hardness Test<\/strong><\/h2>\n\n\n\n<p>The durometer method provides numerous advantages:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Fast testing process<\/li>\n\n\n\n<li>Einfache Bedienung<\/li>\n\n\n\n<li>Non-destructive evaluation<\/li>\n\n\n\n<li>Portable equipment<\/li>\n\n\n\n<li>Low testing cost<\/li>\n\n\n\n<li>Immediate results<\/li>\n\n\n\n<li>Suitable for a wide range of materials<\/li>\n<\/ul>\n\n\n\n<p>These benefits contribute to its widespread industrial use.<\/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-the-durometer-hardness-test\"><strong>Limitations of the Durometer Hardness Test<\/strong><\/h2>\n\n\n\n<p>Despite its popularity, some limitations exist:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Not suitable for most metals<\/li>\n\n\n\n<li>Sensitive to sample thickness<\/li>\n\n\n\n<li>Influenced by temperature variations<\/li>\n\n\n\n<li>Requires proper testing technique<\/li>\n\n\n\n<li>Different scales may not be directly comparable<\/li>\n<\/ul>\n\n\n\n<p>Understanding these limitations improves testing reliability.<\/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-common-materials-tested-with-a-durometer\"><strong>Common Materials Tested with a Durometer<\/strong><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-rubber-products\"><strong>Rubber Products<\/strong><\/h3>\n\n\n\n<p>Examples include:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Tires<\/li>\n\n\n\n<li>O-rings<\/li>\n\n\n\n<li>Gaskets<\/li>\n\n\n\n<li>Seals<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-plastics-and-polymers\"><strong>Plastics and Polymers<\/strong><\/h3>\n\n\n\n<p>Common materials include:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>PVC<\/li>\n\n\n\n<li>Polyethylene<\/li>\n\n\n\n<li>Polypropylene<\/li>\n\n\n\n<li>Nylon<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-silicone-and-elastomers\"><strong>Silicone and Elastomers<\/strong><\/h3>\n\n\n\n<p>Durometer testing is frequently used for:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Medical-grade silicone<\/li>\n\n\n\n<li>Industrial elastomers<\/li>\n\n\n\n<li>Flexible tubing<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-foams-and-soft-materials\"><strong>Foams and Soft Materials<\/strong><\/h3>\n\n\n\n<p>Specialized scales are available for evaluating:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Foam products<\/li>\n\n\n\n<li>Cushioning materials<\/li>\n\n\n\n<li>Soft gels<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<figure class=\"wp-block-image aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"450\" height=\"450\" src=\"https:\/\/hardnesstests.com\/wp-content\/uploads\/2026\/01\/64.jpg\" alt=\"Durometer hardness test on rubber material\" class=\"wp-image-30382\" srcset=\"https:\/\/hardnesstests.com\/wp-content\/uploads\/2026\/01\/64.jpg 450w, https:\/\/hardnesstests.com\/wp-content\/uploads\/2026\/01\/64-300x300.jpg 300w, https:\/\/hardnesstests.com\/wp-content\/uploads\/2026\/01\/64-150x150.jpg 150w, https:\/\/hardnesstests.com\/wp-content\/uploads\/2026\/01\/64-12x12.jpg 12w, https:\/\/hardnesstests.com\/wp-content\/uploads\/2026\/01\/64-400x400.jpg 400w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-industrial-applications\"><strong>Industrielle Anwendungen<\/strong><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-automotive-industry\"><strong>Autoindustrie<\/strong><\/h3>\n\n\n\n<p>Manufacturers test:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Weather stripping<\/li>\n\n\n\n<li>Rubber mounts<\/li>\n\n\n\n<li>Seals and gaskets<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-medical-devices\"><strong>Medizinische Ger\u00e4te<\/strong><\/h3>\n\n\n\n<p>Die Anwendungen umfassen:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Catheters<\/li>\n\n\n\n<li>Tubing<\/li>\n\n\n\n<li>Silicone implants<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-manufacturing-and-quality-control\"><strong>Manufacturing and Quality Control<\/strong><\/h3>\n\n\n\n<p>Durometer testing ensures:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Product consistency<\/li>\n\n\n\n<li>Material compliance<\/li>\n\n\n\n<li>Process control<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-consumer-products\"><strong>Consumer Products<\/strong><\/h3>\n\n\n\n<p>Examples include:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Sporting goods<\/li>\n\n\n\n<li>Footwear<\/li>\n\n\n\n<li>Electronic accessories<\/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-durometer-hardness-test-vs-shore-hardness-test\"><strong>Durometer Hardness Test vs Shore Hardness Test<\/strong><\/h2>\n\n\n\n<p>A common misconception is that these are different tests.<\/p>\n\n\n\n<p>In reality:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Durometer<\/strong> = the instrument<\/li>\n\n\n\n<li><strong>Shore hardness<\/strong> = the measurement scale<\/li>\n<\/ul>\n\n\n\n<p>Therefore, a durometer hardness test is essentially a Shore hardness test performed using a durometer.<\/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>Industrienormen und Konformit\u00e4t<\/strong><\/h2>\n\n\n\n<p>The durometer hardness test is governed by internationally recognized standards:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>ASTM D2240<\/li>\n\n\n\n<li>ISO 868<\/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:\/\/hardnesstests.com\/de\/products\/\" target=\"_blank\" rel=\"noreferrer noopener\">ASTM International<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/hardnesstests.com\/de\/products\/\" target=\"_blank\" rel=\"noreferrer noopener\">ISO Standards Organization<\/a><\/li>\n<\/ul>\n\n\n\n<p>Following these standards ensures consistency and comparability of 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-a-durometer-hardness-test\"><strong>1. What is a durometer hardness test?<\/strong><\/h3>\n\n\n\n<p>It is a test that measures a material\u2019s resistance to indentation using a durometer instrument.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-2-what-materials-can-be-tested-with-a-durometer\"><strong>2. What materials can be tested with a durometer?<\/strong><\/h3>\n\n\n\n<p>Rubber, silicone, plastics, elastomers, foams, and flexible polymers.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-3-what-is-the-difference-between-shore-a-and-shore-d\"><strong>3. What is the difference between Shore A and Shore D?<\/strong><\/h3>\n\n\n\n<p>Shore A is used for softer materials, while Shore D is used for harder plastics and polymers.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-4-is-the-durometer-hardness-test-destructive\"><strong>4. Is the durometer hardness test destructive?<\/strong><\/h3>\n\n\n\n<p>No. It is generally considered non-destructive because it leaves little or no permanent damage.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-5-why-are-multiple-measurements-recommended\"><strong>5. Why are multiple measurements recommended?<\/strong><\/h3>\n\n\n\n<p>Material properties may vary slightly across the surface, so averaging improves accuracy.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-6-which-industries-use-durometer-testing\"><strong>6. Which industries use durometer testing?<\/strong><\/h3>\n\n\n\n<p>Automotive, medical, plastics, manufacturing, aerospace, and consumer product 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>Schlussfolgerung<\/strong><\/h2>\n\n\n\n<p>Die <strong>durometer hardness test<\/strong> is an essential method for evaluating the hardness of rubber, plastics, silicone, elastomers, and other flexible materials. Its simplicity, speed, portability, and reliability make it one of the most widely used material testing methods in modern manufacturing and quality control.<\/p>\n\n\n\n<p>By understanding durometer scales, testing procedures, and applications, manufacturers can improve product quality, maintain consistency, and make more informed material selection decisions.<\/p>","protected":false},"excerpt":{"rendered":"<p>Introduction to the Durometer Hardness Test The durometer hardness test is one of the most widely used methods for measuring<\/p>","protected":false},"author":4,"featured_media":30304,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[117],"tags":[141],"class_list":["post-30934","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-hardness-tester","tag-durometer-hardness-test"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v25.4 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