{"id":16899,"date":"2024-01-12T11:13:32","date_gmt":"2024-01-12T10:13:32","guid":{"rendered":"https:\/\/www.rct-online.de\/magazin\/?p=16899"},"modified":"2026-10-13T17:42:31","modified_gmt":"2026-10-13T15:42:31","slug":"plastic-vs-stainless-steel-which-is-better-for-handling-chemicals","status":"publish","type":"post","link":"https:\/\/www.rct-online.de\/magazin\/en\/plastic-vs-stainless-steel-which-is-better-for-handling-chemicals\/","title":{"rendered":"Plastic vs. Stainless Steel: Which Is Better for Handling Chemicals?"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_73 ez-toc-wrap-center counter-hierarchy ez-toc-counter ez-toc-white ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/www.rct-online.de\/magazin\/en\/plastic-vs-stainless-steel-which-is-better-for-handling-chemicals\/#Not_All_Plastics_Are_Alike\" title=\"Not All Plastics Are Alike\">Not All Plastics Are Alike<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.rct-online.de\/magazin\/en\/plastic-vs-stainless-steel-which-is-better-for-handling-chemicals\/#Plastic_and_Stainless_Steel_Compared\" title=\"Plastic and Stainless Steel Compared\">Plastic and Stainless Steel Compared<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.rct-online.de\/magazin\/en\/plastic-vs-stainless-steel-which-is-better-for-handling-chemicals\/#Temperature_Resistance_and_Manufacturing_Methods\" title=\"Temperature Resistance and Manufacturing Methods\">Temperature Resistance and Manufacturing Methods<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.rct-online.de\/magazin\/en\/plastic-vs-stainless-steel-which-is-better-for-handling-chemicals\/#Chemical_Resistance_and_Conductivity\" title=\"Chemical Resistance and Conductivity\">Chemical Resistance and Conductivity<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/www.rct-online.de\/magazin\/en\/plastic-vs-stainless-steel-which-is-better-for-handling-chemicals\/#Plastics_Perform_Well_in_Sterilisation_and_Cleaning\" title=\"Plastics Perform Well in Sterilisation and Cleaning\">Plastics Perform Well in Sterilisation and Cleaning<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/www.rct-online.de\/magazin\/en\/plastic-vs-stainless-steel-which-is-better-for-handling-chemicals\/#FDA_Compliance_and_Food_Contact_Suitability_of_Plastics\" title=\"FDA Compliance and Food Contact Suitability of Plastics\">FDA Compliance and Food Contact Suitability of Plastics<\/a><\/li><\/ul><\/nav><\/div>\n<p style=\"text-align: justify;\"><strong>Stainless steel is a standard material in chemical processing. With hydrochloric acid and many chloride-containing media, however, it reaches its limits. Manufacturers therefore often line pipes, valves and fittings for such media with fluoropolymers such as PTFE or PFA. This raises an obvious question: why not make the entire component from plastic? This comparison shows where plastic is the better choice and where stainless steel keeps its strengths. The article covers chemical resistance, temperature limits, manufacturing, sterilisability and food contact approvals.<\/strong><\/p>\n<h2><span class=\"ez-toc-section\" id=\"Not_All_Plastics_Are_Alike\"><\/span>Not All Plastics Are Alike<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p style=\"text-align: justify;\">Today, plastics fall into three main groups: thermoplastics, thermosets and elastomers. Thermoplastics such as PE and PP consist of long linear or branched molecular chains. Good formability is one of their strengths, but standard thermoplastics have limited heat resistance. <a href=\"https:\/\/www.rct-online.de\/magazin\/en\/what-are-thermosets-properties-and-applications\/\">Thermosets<\/a> such as crosslinked PU behave differently: they do not melt when heated, but decompose. They are also much harder and more brittle than thermoplastics. Elastomers include all types of crosslinked rubber, such as FKM. Even low tensile or compressive loads deform them elastically.<\/p>\n<p><a href=\"https:\/\/www.rct-online.de\/en\/tube-hose-connectors\/connectors-made-of-plastic\/barb-connectors\/28952\/straight-barb-union-made-of-pp-pvdf-or-ptfe\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-976 size-full\" title=\"Straight barb connector made of PP\/PVDF\/PTFE\" src=\"https:\/\/www.rct-online.de\/magazin\/wp-content\/uploads\/2018\/01\/Gerade-Schlaucht\u00fclle-aus-PPPVDFPTFE.jpg\" alt=\"Straight barb connector made of PP\/PVDF\/PTFE\" width=\"300\" height=\"161\" \/><\/a> <a href=\"https:\/\/www.rct-online.de\/en\/tube-hose-connectors\/connectors-made-of-plastic\/barb-connectors\/28954\/straight-barb-connector-with-male-thread-made-of-pp-pvdf-or-ptfe\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-977 size-full\" title=\"Straight barb connector with male thread made of PP\/PVDF\/PTFE\" src=\"https:\/\/www.rct-online.de\/magazin\/wp-content\/uploads\/2018\/01\/Gerade-Schlaucht\u00fclle-mit-Au\u00dfengewinde-aus-PPPVDFPTFE.jpg\" alt=\"Straight barb connector with male thread made of PP\/PVDF\/PTFE\" width=\"300\" height=\"191\" \/><\/a><\/p>\n<h2><span class=\"ez-toc-section\" id=\"Plastic_and_Stainless_Steel_Compared\"><\/span>Plastic and Stainless Steel Compared<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3><span class=\"ez-toc-section\" id=\"Temperature_Resistance_and_Manufacturing_Methods\"><\/span>Temperature Resistance and Manufacturing Methods<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p style=\"text-align: justify;\">Compared with metals, plastics have a number of unusual properties. Unlike standard plastics, high-performance plastics retain their strength and stiffness even at elevated temperatures. Shaping stainless steel by casting or machining is costly, and casting moulds restrict the possible geometries. Injection moulding, by contrast, turns thermoplastics into complex parts with comparatively little effort. Fitters can also assemble and dismantle plastic components with ease.<\/p>\n<p><a href=\"https:\/\/www.rct-online.de\/en\/tubes-hoses\/tubings-and-pipes-made-of-rigid-plastics\/pvdf-tubing-and-pipes\/28794\/pvdf-chemical-tubing\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-966 size-full\" title=\"PVDF chemical tubing\" src=\"https:\/\/www.rct-online.de\/magazin\/wp-content\/uploads\/2018\/01\/PVDF-Chemieschlauch.jpg\" alt=\"PVDF plastic chemical tubing\" width=\"600\" height=\"401\" srcset=\"https:\/\/www.rct-online.de\/magazin\/wp-content\/uploads\/2018\/01\/PVDF-Chemieschlauch.jpg 600w, https:\/\/www.rct-online.de\/magazin\/wp-content\/uploads\/2018\/01\/PVDF-Chemieschlauch-300x201.jpg 300w, https:\/\/www.rct-online.de\/magazin\/wp-content\/uploads\/2018\/01\/PVDF-Chemieschlauch-110x75.jpg 110w\" sizes=\"(max-width: 600px) 100vw, 600px\" \/><\/a><\/p>\n<p style=\"text-align: justify;\">Today, 3D printing also makes plastic prototypes and mould inserts simpler and more flexible to produce. Once the drawing is loaded, the printer software calculates the exact print time. Prototypes can therefore print overnight and go straight into use the next morning. High-resolution printers also work with great precision, building layers just 0.016 mm thick. For very small batches in particular, manufacturers can now print inserts for injection moulds.<\/p>\n<p style=\"text-align: justify;\">Multi-component injection moulding goes on to combine several plastics with different properties in a targeted way. For example, the process can embed an elastomer in a rigid plastic part to form an integrated <a href=\"https:\/\/www.rct-online.de\/en\/seals-and-gaskets\/o-rings\">O-ring<\/a>. Manufacturers can also mould a soft grip onto knurled knobs. This combines the hardness of the plastic with the flexibility of rubber. Stainless steel, by comparison, usually requires mechanical joining methods such as crimping.<\/p>\n<p><a href=\"https:\/\/www.rct-online.de\/en\/tube-hose-connectors\/connectors-made-of-plastic\/barb-connectors\/28902\/mini-screw-in-connector-with-male-thread-unf-1\/4-quot-28\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-972 size-full\" title=\"Mini barb connector with UNF 1\/4&quot;-28 male thread\" src=\"https:\/\/www.rct-online.de\/magazin\/wp-content\/uploads\/2018\/01\/Mini-Schlaucht\u00fclle-mit-Au\u00dfengewinde-UNF.jpg\" alt=\"Mini barb connector with UNF 1\/4&quot;-28 male thread\" width=\"300\" height=\"245\" \/><\/a> <a href=\"https:\/\/www.rct-online.de\/en\/tube-hose-connectors\/connectors-made-of-plastic\/barb-connectors\/28902\/mini-screw-in-connector-with-male-thread-unf-1\/4-quot-28\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-973\" title=\"Mini T reducing barb connector - symmetrical\" src=\"https:\/\/www.rct-online.de\/magazin\/wp-content\/uploads\/2018\/01\/Mini-T-Reduzier-Schlaucht\u00fclle-symmetrisch.jpg\" alt=\"Mini T reducing barb connector - symmetrical\" width=\"280\" height=\"246\" \/><\/a><\/p>\n<p style=\"text-align: justify;\">What makes stainless steel products harder to manufacture becomes an advantage in use. Stainless steel is far more heat-resistant than plastics and remains load-bearing at temperatures no plastic can withstand. Across the entire value chain, however, weight also counts. Stainless steel is much heavier than plastic, which drives up transport costs, among other things. For plastic products, these costs remain comparatively low.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Chemical_Resistance_and_Conductivity\"><\/span>Chemical Resistance and Conductivity<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p style=\"text-align: justify;\">High-performance plastics stand out above all for their resistance to many aggressive chemicals. As non-metals, plastics are not subject to electrochemical corrosion. Many of them therefore resist inorganic media such as mineral acids, alkalis and aqueous salt solutions.<\/p>\n<p style=\"text-align: justify;\">Even with highly aggressive chemicals, the right plastic delivers long-term, corrosion-free service. Plastic <a href=\"https:\/\/www.rct-online.de\/en\/cocks-taps-valves\/pneumatic-cocks\">ball valves<\/a>, for example, have proven themselves in practice with service lives of 35 years.<\/p>\n<p><a href=\"https:\/\/www.rct-online.de\/en\/cocks-taps-valves\/stopcocks-and-straight-way-cocks\/29400\/high-quality-ball-cock-made-of-pp-pvdf-or-pfa-injection-molded\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-960 size-full\" title=\"Ball valve made of PP\/PVDF\/PFA - injection-moulded\" src=\"https:\/\/www.rct-online.de\/magazin\/wp-content\/uploads\/2018\/01\/Kugelhahn-aus-PP-PVDF-PFA-gespritzt.jpg\" alt=\"Ball valve made of PP\/PVDF\/PFA - injection-moulded\" width=\"300\" height=\"226\" \/><\/a><\/p>\n<p style=\"text-align: justify;\">Unlike metals, however, some plastics are sensitive to organic solvents such as alcohols, acetone or petrol. Even so, material developers have created plastics that resist these media as well.<\/p>\n<p style=\"text-align: justify;\">Potentially explosive atmospheres call for electrically conductive plastics wherever aggressive media are involved. Typical examples are conductive grades of PP, PVDF or PTFE. Manufacturers fill these materials with electrically conductive particles to prevent static charge build-up. For outdoor applications, fluoropolymers such as PTFE are well suited because they resist UV radiation.<\/p>\n<p><a href=\"https:\/\/www.rct-online.de\/en\/tubes-hoses\/tubings-and-pipes-made-of-rigid-plastics\/ptfe-tubing\/28770\/ptfe-chemical-tubing-standard\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-964 size-full\" title=\"PTFE chemical tubing\" src=\"https:\/\/www.rct-online.de\/magazin\/wp-content\/uploads\/2018\/01\/PTFE-Chemieschlauch.jpg\" alt=\"PTFE chemical tubing\" width=\"600\" height=\"408\" srcset=\"https:\/\/www.rct-online.de\/magazin\/wp-content\/uploads\/2018\/01\/PTFE-Chemieschlauch.jpg 600w, https:\/\/www.rct-online.de\/magazin\/wp-content\/uploads\/2018\/01\/PTFE-Chemieschlauch-300x204.jpg 300w, https:\/\/www.rct-online.de\/magazin\/wp-content\/uploads\/2018\/01\/PTFE-Chemieschlauch-110x75.jpg 110w\" sizes=\"(max-width: 600px) 100vw, 600px\" \/><\/a><\/p>\n<h2><span class=\"ez-toc-section\" id=\"Plastics_Perform_Well_in_Sterilisation_and_Cleaning\"><\/span>Plastics Perform Well in Sterilisation and Cleaning<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p style=\"text-align: justify;\">Many plastics can be sterilised by several methods and withstand frequent cleaning. PVDF and PFA tolerate high heat and pressure. This makes them suitable for steam sterilisation, and both can be autoclaved at 134 \u00b0C (273 \u00b0F). PVDF can also be sterilised with gamma radiation at typical doses of 25 to 50 kGy. Its mechanical properties remain intact. Within its service temperature range up to 150 \u00b0C (302 \u00b0F), PVDF is physiologically safe. Its surface behaves much like glass and offers no breeding ground for microorganisms. In this respect, too, plastics can match stainless steel.<\/p>\n<p><a href=\"https:\/\/www.rct-online.de\/en\/tube-hose-connectors\/connectors-made-of-plastic\/conductive-connector\/29128\/elbow-tube-connector-made-of-pp-or-pvdf-conductive-and-antistatic\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-968 size-full\" title=\"Elbow tube connector made of PP\/PVDF - conductive and antistatic\" src=\"https:\/\/www.rct-online.de\/magazin\/wp-content\/uploads\/2018\/01\/Winkel-Schlauchverbinder-aus-PPPVDF-leitf\u00e4hig-und-antistatisch.jpg\" alt=\"Elbow tube connector made of PP\/PVDF plastic - conductive and antistatic\" width=\"600\" height=\"300\" srcset=\"https:\/\/www.rct-online.de\/magazin\/wp-content\/uploads\/2018\/01\/Winkel-Schlauchverbinder-aus-PPPVDF-leitf\u00e4hig-und-antistatisch.jpg 600w, https:\/\/www.rct-online.de\/magazin\/wp-content\/uploads\/2018\/01\/Winkel-Schlauchverbinder-aus-PPPVDF-leitf\u00e4hig-und-antistatisch-300x150.jpg 300w\" sizes=\"(max-width: 600px) 100vw, 600px\" \/><\/a><\/p>\n<p style=\"text-align: justify;\">With their material properties, high-performance plastics make a major contribution to safety in chemical processing. <a href=\"https:\/\/www.rct-online.de\/en\/tube-hose-connectors\">Tube and hose connectors<\/a>, <a href=\"https:\/\/www.rct-online.de\/en\/tubes-hoses\">plastic tubing<\/a> and <a href=\"https:\/\/www.rct-online.de\/en\/flow-meters\">flow meters<\/a> serve in a wide range of applications. Cleaning processes such as cleaning in place (CIP) and sterilisation in place (SIP) are one example. Here, these components safely supply and remove cleaning chemicals and concentrates. In disinfection systems, operators fit <a href=\"https:\/\/www.rct-online.de\/en\/cocks-taps-valves\/check-valves\">check valves<\/a> together with tube and hose connectors. This stops media from flowing back out of the system.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"FDA_Compliance_and_Food_Contact_Suitability_of_Plastics\"><\/span>FDA Compliance and Food Contact Suitability of Plastics<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p style=\"text-align: justify;\">In drinking water treatment, the products withstand ozone, chlorine, chlorine dioxide and electrochemically activated (ECA) water. Most of them also resist UV radiation. The products must meet the standards and approvals of the respective industry. Components in contact with drinking water are subject to specific EU and national requirements. In Germany, these include the assessment criteria of the <strong>German Environment Agency (UBA)<\/strong>. In food applications, compliance with <strong>FDA<\/strong> requirements and <strong>Regulation (EC) No 1935\/2004<\/strong> is essential.<\/p>\n<p style=\"text-align: justify;\">The <a href=\"https:\/\/www.fda.gov\/\">US Food and Drug Administration (FDA) is the US federal agency for food safety and drug approval<\/a>. It oversees the safety and efficacy of human and veterinary drugs, biological products and medical devices. It also regulates food and radiation-emitting products. Its remit covers products made in the USA and imported products alike.<\/p>\n<p><a href=\"https:\/\/www.rct-online.de\/en\/cocks-taps-valves\/stopcocks-and-straight-way-cocks\/29384\/stopcock-made-of-ldpe\/pp-or-pvdf\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-970 size-full\" title=\"Stopcock made of LDPE\/PVDF\" src=\"https:\/\/www.rct-online.de\/magazin\/wp-content\/uploads\/2018\/01\/Absperrhahn-aus-LDPEPVDF.jpg\" alt=\"Stopcock made of LDPE\/PVDF plastic\" width=\"600\" height=\"372\" srcset=\"https:\/\/www.rct-online.de\/magazin\/wp-content\/uploads\/2018\/01\/Absperrhahn-aus-LDPEPVDF.jpg 600w, https:\/\/www.rct-online.de\/magazin\/wp-content\/uploads\/2018\/01\/Absperrhahn-aus-LDPEPVDF-300x186.jpg 300w\" sizes=\"(max-width: 600px) 100vw, 600px\" \/><\/a><\/p>\n<p style=\"text-align: justify;\">Regulation (EC) No 1935\/2004 sets harmonised rules for materials and articles in direct or indirect contact with food, including packaging. It protects human health and consumer interests and ensures that these products can be sold throughout the EU. Many plastic grades also meet additional standards and approvals.<\/p>\n<p style=\"text-align: justify;\">Depending on the manufacturer, PVDF and PFA meet biocompatibility requirements for <a href=\"https:\/\/www.rct-online.de\/magazin\/en\/usp-class-vi-approval\/\">medical and pharmaceutical products (USP Class VI)<\/a>. Many materials, such as ECTFE, bio-based PA or PVDF, are ADI-free and contain no animal-derived ingredients. In production processes, this prevents the material from introducing animal-derived contaminants such as BSE prions.<\/p>\n<p style=\"text-align: justify;\">In many applications, plastic can compete with stainless steel and has long outgrown its role as a mere substitute. Its many positive properties make it a strong choice, above all in chemical processing.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Stainless steel is a standard material in chemical processing. With hydrochloric acid and many chloride-containing media, however, it reaches its limits. Manufacturers therefore often line pipes, valves and fittings for such media with fluoropolymers such as PTFE or PFA. This raises an obvious question: why not make the entire component from plastic? This comparison shows &hellip;<\/p>\n","protected":false},"author":1,"featured_media":11265,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1,2748],"tags":[2897,4407,2762,4431,3868,3452,3449,4432],"class_list":["post-16899","post","type-post","status-publish","format-standard","has-post-thumbnail","","category-all-articles","category-materials-in-chemistry","tag-ball-valves","tag-hose-connectors","tag-o-rings","tag-plastic-and-stainless-steel-compared","tag-plastics","tag-thermoplastics","tag-thermosets","tag-tubes-and-hoses"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v23.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Plastic vs. Stainless Steel: Which Is Better for Handling Chemicals?<\/title>\n<meta name=\"description\" content=\"Plastic or stainless steel for conveying chemicals? What each material offers. Types of plastic \u2714 Chemical resistance \u2714 Manufacturing \u2714 | RCT Magazine\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.rct-online.de\/magazin\/en\/plastic-vs-stainless-steel-which-is-better-for-handling-chemicals\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Plastic vs. Stainless Steel: Which Is Better for Handling Chemicals?\" \/>\n<meta property=\"og:description\" content=\"Plastic or stainless steel for conveying chemicals? What each material offers. 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