{"id":3389,"date":"2023-02-23T00:00:00","date_gmt":"2023-02-22T23:00:00","guid":{"rendered":"https:\/\/epidor.com\/materiales-elastomericos\/"},"modified":"2025-05-05T12:11:58","modified_gmt":"2025-05-05T10:11:58","slug":"elastomeric-materials","status":"publish","type":"post","link":"https:\/\/epidor.com\/en\/blog\/materiales-elastomericos\/","title":{"rendered":"Elastomeric materials"},"content":{"rendered":"<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">In order to understand the <\/span><a href=\"https:\/\/epidor-srt.com\/producto\/juntas-toricas\/juntas-toricas\/\" target=\"_blank\" rel=\"noopener\"><span style=\"font-weight: 400;\">O-rings<\/span><\/a><span style=\"font-weight: 400;\">, In addition, it is necessary to talk about the <\/span><b>elastomeric materials <\/b><span style=\"font-weight: 400;\">used to manufacture them.\u00a0<\/span><\/p>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">In this blog entry <\/span><b>we will bring you up to date <\/b><span style=\"font-weight: 400;\">about the characteristics of the different materials and their functionality - let's get started!<\/span><\/p>\n<p>&nbsp;<\/p>\n<p><iframe loading=\"lazy\" title=\"YouTube video player\" src=\"https:\/\/www.youtube.com\/embed\/1uoV3ON9044\" width=\"560\" height=\"315\" frameborder=\"0\" allowfullscreen=\"allowfullscreen\"><\/iframe><\/p>\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_82_2 ez-toc-wrap-left counter-flat ez-toc-counter ez-toc-transparent ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Index<\/p>\n<span class=\"ez-toc-title-toggle\"><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1' ><li class='ez-toc-page-1'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/epidor.com\/en\/blog\/materiales-elastomericos\/#Las_imperfecciones\" >Imperfections<\/a><\/li><li class='ez-toc-page-1'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/epidor.com\/en\/blog\/materiales-elastomericos\/#Otras_posibilidades\" >Other possibilities<\/a><\/li><li class='ez-toc-page-1'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/epidor.com\/en\/blog\/materiales-elastomericos\/#Memoria_elastica_de_los_materiales_elastomericos\" >Elastic memory of elastomeric materials<\/a><\/li><li class='ez-toc-page-1'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/epidor.com\/en\/blog\/materiales-elastomericos\/#Tipos_de_caucho\" >Types of rubber<\/a><\/li><li class='ez-toc-page-1'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/epidor.com\/en\/blog\/materiales-elastomericos\/#Caucho_de_Acrilonitrilo_Butadieno\" >Acrylonitrile Butadiene Rubber<\/a><\/li><li class='ez-toc-page-1'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/epidor.com\/en\/blog\/materiales-elastomericos\/#Caucho_fluorado\" >Fluorinated rubber<\/a><\/li><li class='ez-toc-page-1'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/epidor.com\/en\/blog\/materiales-elastomericos\/#Caucho_de_Etileno_Propileno\" >Ethylene Propylene Rubber<\/a><\/li><li class='ez-toc-page-1'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/epidor.com\/en\/blog\/materiales-elastomericos\/#Caucho_de_Silicona_o_VMQ\" >Silicone Rubber, or VMQ<\/a><\/li><li class='ez-toc-page-1'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/epidor.com\/en\/blog\/materiales-elastomericos\/#Caucho_perfluorelastomero\" >Perfluoroelastomer rubber<\/a><\/li><li class='ez-toc-page-1'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/epidor.com\/en\/blog\/materiales-elastomericos\/#Nitrilo_Hidrogenado_o_HNBR\" >Hydrogenated Nitrile or HNBR<\/a><\/li><li class='ez-toc-page-1'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/epidor.com\/en\/blog\/materiales-elastomericos\/#Este_elastomero_mejora_la_resistencia_a_las_temperaturas_del_NBR_y_cuenta_con_una_resistencia_al_desgaste_alta\" >This elastomer improves the temperature resistance of NBR and has a high wear resistance.<\/a><\/li><li class='ez-toc-page-1'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/epidor.com\/en\/blog\/materiales-elastomericos\/#Caucho_de_cloropreno\" >Chloroprene rubber<\/a><\/li><li class='ez-toc-page-1'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/epidor.com\/en\/blog\/materiales-elastomericos\/#FEPM\" >FEPM<\/a><\/li><li class='ez-toc-page-1'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"https:\/\/epidor.com\/en\/blog\/materiales-elastomericos\/#NR\" >NR<\/a><\/li><li class='ez-toc-page-1'><a class=\"ez-toc-link ez-toc-heading-15\" href=\"https:\/\/epidor.com\/en\/blog\/materiales-elastomericos\/#Poliuretano\" >Polyurethane\u00a0<\/a><\/li><li class='ez-toc-page-1'><a class=\"ez-toc-link ez-toc-heading-16\" href=\"https:\/\/epidor.com\/en\/blog\/materiales-elastomericos\/#Caracteristicas_que_debe_tener_un_material_elastomerico\" >Characteristics that an elastomeric material must have<\/a><\/li><li class='ez-toc-page-1'><a class=\"ez-toc-link ez-toc-heading-17\" href=\"https:\/\/epidor.com\/en\/blog\/materiales-elastomericos\/#Temperatura\" >Temperature<\/a><\/li><li class='ez-toc-page-1'><a class=\"ez-toc-link ez-toc-heading-18\" href=\"https:\/\/epidor.com\/en\/blog\/materiales-elastomericos\/#Resistencia_quimica\" >Chemical resistance<\/a><\/li><li class='ez-toc-page-1'><a class=\"ez-toc-link ez-toc-heading-19\" href=\"https:\/\/epidor.com\/en\/blog\/materiales-elastomericos\/#Dureza\" >Hardness<\/a><\/li><li class='ez-toc-page-1'><a class=\"ez-toc-link ez-toc-heading-20\" href=\"https:\/\/epidor.com\/en\/blog\/materiales-elastomericos\/#Vida_de_estanteria\" >Shelf life<\/a><\/li><\/ul><\/nav><\/div>\n<h2 style=\"text-align: justify;\"><span class=\"ez-toc-section\" id=\"Las_imperfecciones\"><\/span><span style=\"font-weight: 400;\">Imperfections<\/span><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">When considering a seal between two surfaces, it is absolutely essential to take into account the level of imperfections it has. <\/span><b>Even on the flattest surface there is a degree of unevenness<\/b><span style=\"font-weight: 400;\">.<\/span><\/p>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">For this reason, <\/span><b>it is difficult to generate a seal directly between two surfaces<\/b><span style=\"font-weight: 400;\">, unless a large force is applied that crushes one face against the other.<\/span><\/p>\n<p style=\"text-align: justify;\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-20734\" src=\"https:\/\/epidor.com\/wp-content\/uploads\/2025\/04\/EPISER_SRT_Materialeselastomericos_865x395_interior1_BLOG-.jpg\" alt=\"elastomeric materials\" width=\"865\" height=\"395\" \/><\/p>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">The filling of surface imperfections is effectively achieved through the use of seals made from elastomeric materials.<\/span><\/p>\n<h2 style=\"text-align: justify;\"><span class=\"ez-toc-section\" id=\"Otras_posibilidades\"><\/span><span style=\"font-weight: 400;\">Other possibilities<\/span><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">In addition to elastomers, there are also other gasketing materials. These are presented below:<\/span><\/p>\n<ul style=\"text-align: justify;\">\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Compressed fibers<\/b><span style=\"font-weight: 400;\"> which are popularly known as \u201ccartons\u201d and require considerably more clamping force than elastomers.<\/span><\/li>\n<\/ul>\n<ul style=\"text-align: justify;\">\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Materials combining fibers, graphite, Teflon, etc.<\/b><span style=\"font-weight: 400;\"> and other reinforcing materials.<\/span><\/li>\n<\/ul>\n<ul style=\"text-align: justify;\">\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>All-metal materials<\/b><span style=\"font-weight: 400;\"> which, under extreme conditions, show the necessary elasticity for the sealing of two surfaces.<\/span><\/li>\n<\/ul>\n<h2 style=\"text-align: justify;\"><span class=\"ez-toc-section\" id=\"Memoria_elastica_de_los_materiales_elastomericos\"><\/span><span style=\"font-weight: 400;\">Elastic memory of elastomeric materials<\/span><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">Elastomer seals always act by virtue of their elasticity. They deform under a load or force and recover their shape when the force ceases.<\/span><\/p>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">To understand how they achieve this, one must imagine a skein of wool with a particularity: the various threads that make up the ball are linked together by springs. So that when the ball is tightened, it deforms and when the load that deforms it disappears, then the springs \u201cintervene\u201d and recover the separation between strands. Hence the term \u201celastic memory\u201d.<\/span><\/p>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">It must be taken into account that all elastomers lose this so-called elastic memory with time and use. As with everything else, they also wear out.<\/span><\/p>\n<h2 style=\"text-align: justify;\"><span class=\"ez-toc-section\" id=\"Tipos_de_caucho\"><\/span><span style=\"font-weight: 400;\">Types of rubber<\/span><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<ul style=\"text-align: justify;\">\n<li style=\"font-weight: 400;\" aria-level=\"1\">\n<h3><span class=\"ez-toc-section\" id=\"Caucho_de_Acrilonitrilo_Butadieno\"><\/span><span style=\"font-weight: 400;\">Acrylonitrile Butadiene Rubber<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<\/li>\n<\/ul>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">Also known as Nitrile or NBR. <\/span><b>Excellent for use with mineral oils<\/b><span style=\"font-weight: 400;\"> and general uses.<\/span><\/p>\n<ul style=\"text-align: justify;\">\n<li style=\"font-weight: 400;\" aria-level=\"1\">\n<h3><span class=\"ez-toc-section\" id=\"Caucho_fluorado\"><\/span><span style=\"font-weight: 400;\">Fluorinated rubber<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<\/li>\n<\/ul>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">Known as <\/span><b>Viton, or FKM or FPM.<\/b><span style=\"font-weight: 400;\"> It has high chemical and temperature resistance to <\/span><b>up to 200 degrees.<\/b><span style=\"font-weight: 400;\"> Therefore, it is often used in applications where other rubbers would have problems with high temperatures.<\/span><\/p>\n<ul style=\"text-align: justify;\">\n<li style=\"font-weight: 400;\" aria-level=\"1\">\n<h3><span class=\"ez-toc-section\" id=\"Caucho_de_Etileno_Propileno\"><\/span><span style=\"font-weight: 400;\">Ethylene Propylene Rubber<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<\/li>\n<\/ul>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">EPDM. <\/span><b>Able to withstand hot water <\/b><span style=\"font-weight: 400;\">and steam better than other elastomers. It does not work well with mineral oils or greases.\u00a0<\/span><\/p>\n<ul style=\"text-align: justify;\">\n<li style=\"font-weight: 400;\" aria-level=\"1\">\n<h3><span class=\"ez-toc-section\" id=\"Caucho_de_Silicona_o_VMQ\"><\/span><span style=\"font-weight: 400;\">Silicone Rubber, or VMQ<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<\/li>\n<\/ul>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">This type of rubber has a <\/span><b>wide temperature range<\/b><span style=\"font-weight: 400;\"> but limited chemical and mechanical resistance. It is suitable for food applications.<\/span><\/p>\n<ul style=\"text-align: justify;\">\n<li style=\"font-weight: 400;\" aria-level=\"1\">\n<h3><span class=\"ez-toc-section\" id=\"Caucho_perfluorelastomero\"><\/span><span style=\"font-weight: 400;\">Perfluoroelastomer rubber<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<\/li>\n<\/ul>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">Known as FFKM or FFPM with<\/span><b> virtually universal chemical resistance<\/b><span style=\"font-weight: 400;\">.\u00a0<\/span><\/p>\n<ul style=\"text-align: justify;\">\n<li style=\"font-weight: 400;\" aria-level=\"1\">\n<h3><span class=\"ez-toc-section\" id=\"Nitrilo_Hidrogenado_o_HNBR\"><\/span><span style=\"font-weight: 400;\">Hydrogenated Nitrile or HNBR<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<\/li>\n<\/ul>\n<h3 style=\"text-align: justify;\"><span class=\"ez-toc-section\" id=\"Este_elastomero_mejora_la_resistencia_a_las_temperaturas_del_NBR_y_cuenta_con_una_resistencia_al_desgaste_alta\"><\/span><span style=\"font-weight: 400;\">This elastomer <\/span><b>improves the temperature resistance of NBR <\/b><span style=\"font-weight: 400;\">and has a high wear resistance.<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<ul style=\"text-align: justify;\">\n<li style=\"font-weight: 400;\" aria-level=\"1\">\n<h3><span class=\"ez-toc-section\" id=\"Caucho_de_cloropreno\"><\/span><span style=\"font-weight: 400;\">Chloroprene rubber<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<\/li>\n<\/ul>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">Also known as neoprene or CR.<\/span><b> Well-known for being one of the first synthetic rubbers<\/b><span style=\"font-weight: 400;\">. It has a very good resistance to weathering and withstands mineral oils.\u00a0<\/span><\/p>\n<ul style=\"text-align: justify;\">\n<li style=\"font-weight: 400;\" aria-level=\"1\">\n<h3><span class=\"ez-toc-section\" id=\"FEPM\"><\/span><span style=\"font-weight: 400;\">FEPM<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<\/li>\n<\/ul>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">Aflas<\/span><span style=\"font-weight: 400;\">\u00ae<\/span><span style=\"font-weight: 400;\"> or FEPM, is a registered trademark for a compound very similar to FPM, but <\/span><b>has improved chemical vapor resistance<\/b><span style=\"font-weight: 400;\"> and to some chemical products.<\/span><\/p>\n<ul style=\"text-align: justify;\">\n<li style=\"font-weight: 400;\" aria-level=\"1\">\n<h3><span class=\"ez-toc-section\" id=\"NR\"><\/span><span style=\"font-weight: 400;\">NR<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<\/li>\n<\/ul>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">The NR <\/span><b>it has good elastic qualities and is used in mechanical applications<\/b><span style=\"font-weight: 400;\"> as in anti-vibration mounts. It is not a material widely used in sealing.<\/span><\/p>\n<ul style=\"text-align: justify;\">\n<li style=\"font-weight: 400;\" aria-level=\"1\">\n<h3><span class=\"ez-toc-section\" id=\"Poliuretano\"><\/span><span style=\"font-weight: 400;\">Polyurethane\u00a0<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<\/li>\n<\/ul>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">Polyurethane is <\/span><b>a thermoplastic, but has a high elasticity and capacity for deformation and elastic memory.<\/b><span style=\"font-weight: 400;\"> It is suitable for working with mineral oils, but not with water, much less with hot water. Due to its wear resistance, it is used in high-pressure hydraulic seals.<\/span><\/p>\n<h2 style=\"text-align: justify;\"><span class=\"ez-toc-section\" id=\"Caracteristicas_que_debe_tener_un_material_elastomerico\"><\/span><span style=\"font-weight: 400;\">Characteristics that an elastomeric material must have<\/span><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">In order to consider a material suitable for use in O-ring seals <\/span><b>it must have several qualities that make it suitable for this purpose<\/b><span style=\"font-weight: 400;\">. These include temperature, chemical resistance and hardness.<\/span><\/p>\n<h3 style=\"text-align: justify;\"><span class=\"ez-toc-section\" id=\"Temperatura\"><\/span><span style=\"font-weight: 400;\">Temperature<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">The operating temperature limits for elastomeric materials are as follows <\/span><b>much more limited than those for metal parts<\/b><span style=\"font-weight: 400;\">, It is therefore important to take them into account.\u00a0<\/span><\/p>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">Elastomeric materials have limits both above and below. At the top, <\/span><b>are usually around 100 to 120 degrees Celsius.<\/b><span style=\"font-weight: 400;\">, although there are compounds that<\/span><b> can reach up to 300.<\/b><span style=\"font-weight: 400;\"> As for subzero temperatures,<\/span><b> The usual range is around minus 30 to 40 degrees Celsius.\u00a0<\/b><\/p>\n<h3 style=\"text-align: justify;\"><span class=\"ez-toc-section\" id=\"Resistencia_quimica\"><\/span><span style=\"font-weight: 400;\">Chemical resistance<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">Chemical resistance is another factor to be taken into account. This one,<\/span><b> can vary greatly from one elastomer to another.\u00a0<\/b><\/p>\n<p style=\"text-align: justify;\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-20738\" src=\"https:\/\/epidor.com\/wp-content\/uploads\/2025\/04\/EPISER_SRT_Materialeselastomericos_865x395_interior2_BLOG-.jpg\" alt=\"elastomeric materials\" width=\"865\" height=\"395\" \/><\/p>\n<h3 style=\"text-align: justify;\"><span class=\"ez-toc-section\" id=\"Dureza\"><\/span><span style=\"font-weight: 400;\">Hardness<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">The hardness of elastomeric materials is usually measured on the following scale<\/span><b> Shore-A.<\/b><span style=\"font-weight: 400;\"> For sponge rubbers the following scales are used <\/span><b>Shore-0<\/b><span style=\"font-weight: 400;\"> y <\/span><b>Shore-00<\/b><span style=\"font-weight: 400;\">, while the hardest plastics are measured on the scale <\/span><b>Shore D<\/b><span style=\"font-weight: 400;\">.\u00a0<\/span><\/p>\n<p style=\"text-align: justify;\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-20742\" src=\"https:\/\/epidor.com\/wp-content\/uploads\/2025\/04\/EPISER_SRT_Materialeselastomericos_865x395_interior3_BLOG-.jpg\" alt=\"elastomeric materials\" width=\"865\" height=\"395\" \/><\/p>\n<h3 style=\"text-align: justify;\"><span class=\"ez-toc-section\" id=\"Vida_de_estanteria\"><\/span><span style=\"font-weight: 400;\">Shelf life<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">Elastomeric materials<\/span> <b>have a limited life. <\/b><span style=\"font-weight: 400;\">Consult our table and you will see the shelf life for each type of elastomeric material.\u00a0<\/span><\/p>\n<p style=\"text-align: justify;\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-20746\" src=\"https:\/\/epidor.com\/wp-content\/uploads\/2025\/04\/EPISER_SRT_Materialeselastomericos_865x395_interior4_BLOG-.jpg\" alt=\"elastomeric materials\" width=\"865\" height=\"395\" \/><\/p>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">We hope this article has been of interest to you. If you need more information about our custom bellows manufacturing service or technical advice, <\/span><a href=\"https:\/\/epidor-srt.com\/contactanos\/\" target=\"_blank\" rel=\"noopener\"><span style=\"font-weight: 400;\">consult our team of experts<\/span><\/a><span style=\"font-weight: 400;\">.<\/span><\/p>","protected":false},"excerpt":{"rendered":"<p>Para poder entender las juntas t\u00f3ricas, es necesario hablar sobre los materiales elastom\u00e9ricos que se utilizan para fabricarlas.\u00a0 En esta entrada del blog te vamos a poner al d\u00eda sobre las caracter\u00edsticas de los distintos materiales y su funcionalidad. \u00a1Empezamos! &nbsp; Las imperfecciones Al considerar una estanqueidad entre dos superficies, es totalmente indispensable contar con [&hellip;]<\/p>\n","protected":false},"author":3,"featured_media":3395,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[43,52],"tags":[],"class_list":["post-3389","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-estanqueidad-para-equipos-rotativos","category-formaciones"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.2 - 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