Dry running of technopolymer gears: advantages, limits and the PV parameter<\/title>\n\n <link rel=\"preconnect\" href=\"https:\/\/fonts.googleapis.com\">\n <link rel=\"preconnect\" href=\"https:\/\/fonts.gstatic.com\" crossorigin=\"\">\n <link href=\"https:\/\/fonts.googleapis.com\/css2?family=Inter:wght@400;500;600;700&display=swap\" rel=\"stylesheet\">\n\n <style>\n *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }\n\n :root {\n --green: #1a6b3c;\n --green-dark: #0f4a28;\n --green-mid: #2d8a55;\n --green-light: #e8f4ed;\n --green-xlight: #f2faf5;\n --amber: #b45309;\n --amber-light: #fef3c7;\n\n --bg: #ffffff;\n --bg-soft: #f8f9fa;\n --bg-muted: #f1f3f5;\n --border: #e5e7eb;\n --border-mid: #d1d5db;\n\n --text-primary: #111827;\n --text-secondary: #4b5563;\n --text-muted: #9ca3af;\n\n --radius-sm: 6px;\n --radius-md: 8px;\n --radius-lg: 12px;\n --shadow-sm: 0 1px 3px rgba(0,0,0,.06), 0 1px 2px rgba(0,0,0,.04);\n --shadow-md: 0 4px 12px rgba(0,0,0,.08), 0 2px 4px rgba(0,0,0,.04);\n }\n\n body { min-height: 100vh; 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}\n\n .badge {\n display: inline-block;\n font-size: 12px;\n font-weight: 600;\n padding: 2px 8px;\n border-radius: 20px;\n background: var(--green-light);\n color: var(--green-dark);\n }\n\n \/* ============================================================\n RESPONSIVE\n ============================================================ *\/\n @media (max-width: 900px) {\n .article-body { flex-direction: column; padding: 20px 20px 48px; }\n }\n \n \/* Glossary tooltips *\/\n .glossary-term {\n border-bottom: 1px dotted var(--green);\n color: var(--green);\n font-style: italic;\n cursor: help;\n }\n .glossary-tooltip {\n position: fixed;\n z-index: 9999;\n background: #fff;\n border: 1px solid var(--border-mid);\n border-radius: var(--radius-md);\n box-shadow: var(--shadow-md);\n padding: 10px 14px;\n max-width: 300px;\n font-family: 'Inter', sans-serif;\n font-size: 13px;\n }\n .glossary-tooltip__title {\n font-weight: 600;\n color: var(--text-primary);\n margin-bottom: 4px;\n }\n .glossary-tooltip__def {\n font-size: 12.5px;\n color: var(--text-secondary);\n line-height: 1.6;\n }\n .glossary-tooltip__tag {\n display: inline-block;\n margin-top: 6px;\n font-size: 9px;\n font-weight: 600;\n padding: 2px 7px;\n border-radius: 20px;\n background: var(--green-light);\n color: var(--green-dark);\n text-transform: uppercase;\n letter-spacing: 0.04em;\n }\n\n <\/style>\n<\/head>\n<body>\n\n<div id=\"tt-gioco-di-flanchi-backlash\" class=\"glossary-tooltip\" hidden=\"\">\n <div class=\"glossary-tooltip__title\">Backlash<\/div>\n <div class=\"glossary-tooltip__def\">Free clearance between the flanks of two mating teeth, measured at the pitch circle. It prevents jamming due to thermal expansion or assembly errors.<\/div>\n <span class=\"glossary-tooltip__tag\">Glossary<\/span>\n<\/div>\n\n <div class=\"article-page\">\n <div class=\"article-body\">\n <div class=\"article-body__main\"><script type=\"application\/ld+json\">\n{\n \"@context\": \"https:\/\/schema.org\",\n \"@graph\": [\n {\n \"@type\": \"TechArticle\",\n \"@id\": \"#article\",\n \"headline\": \"Dry running of technopolymer gears: advantages, limits and the PV parameter\",\n \"description\": \"A gear that turns without oil, without grease, without scheduled maintenance. For those who design food, medical or automation machines, it's often the starting requirement. Technopolymers make it possible, but within precise limits: exceeding them means accelerated wear, overheating and early failure.\",\n \"inLanguage\": \"en\",\n \"mentions\": [\n {\n \"@id\": \"#term-gioco-di-flanchi-backlash\"\n }\n ]\n },\n {\n \"@type\": \"DefinedTermSet\",\n \"@id\": \"#glossario\",\n \"name\": \"Glossario - Dry running of technopolymer gears: advantages, limits and the PV parameter\",\n \"hasDefinedTerm\": [\n {\n \"@type\": \"DefinedTerm\",\n \"@id\": \"#term-gioco-di-flanchi-backlash\",\n \"name\": \"Backlash\",\n \"description\": \"Free clearance between the flanks of two mating teeth, measured at the pitch circle. It prevents jamming due to thermal expansion or assembly errors.\",\n \"inDefinedTermSet\": \"#glossario\"\n }\n ]\n }\n ]\n}\n<\/script>\n\n\n\n <h1 class=\"article__title\">Dry running of technopolymer gears: advantages, limits and the PV parameter<\/h1>\n<p class=\"article__subtitle\">A gear that turns without oil, without grease, without scheduled maintenance. For those who design food, medical or automation machines, it’s often the starting requirement. Technopolymers make it possible, but within precise limits: exceeding them means accelerated wear, overheating and early failure.<\/p>\n<h2 class=\"article__h2\" id=\"dry-running-in-technopolymers\">\n <span class=\"article__h2-icon\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"16\" height=\"16\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"><path d=\"M17.7 7.7a2.5 2.5 0 1 1 1.8 4.3H2\"><\/path><path d=\"M9.6 4.6A2 2 0 1 1 11 8H2\"><\/path><path d=\"M12.6 19.4A2 2 0 1 0 14 16H2\"><\/path><\/svg><\/span>\n Dry running in technopolymers\n<\/h2>\n<p class=\"article__p\">Metal gears require oil or grease to limit friction and wear. Technopolymer ones can work without external lubrication, provided the design respects the material’s tribological limits. The advantage isn’t only operational: less lubricant means less contamination, less maintenance and cleaner work environments. In many industrial applications, replacing metal with technopolymer (metal replacement) also reduces weight, transport costs and environmental impact.<\/p>\n<div class=\"warnbox\">\n <div class=\"warnbox__title\">\n <svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"14\" height=\"14\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"><path d=\"M10.29 3.86L1.82 18a2 2 0 0 0 1.71 3h16.94a2 2 0 0 0 1.71-3L13.71 3.86a2 2 0 0 0-3.42 0z\"><\/path><line x1=\"12\" y1=\"9\" x2=\"12\" y2=\"13\"><\/line><line x1=\"12\" y1=\"17\" x2=\"12.01\" y2=\"17\"><\/line><\/svg>\n Warning\n <\/div>\n <p class=\"warnbox__text\">Dry running isn’t a default condition that’s always valid. If load, speed or temperature leave the specification, the risk is overheating and irreversible damage to the teeth.<\/p>\n<\/div>\n<h2 class=\"article__h2\" id=\"self-lubricating-properties-of-technopolymers\">\n <span class=\"article__h2-icon\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"16\" height=\"16\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"><polygon points=\"12 2 2 7 12 12 22 7 12 2\"><\/polygon><polyline points=\"2 17 12 22 22 17\"><\/polyline><polyline points=\"2 12 12 17 22 12\"><\/polyline><\/svg><\/span>\n Self-lubricating properties of technopolymers\n<\/h2>\n<p class=\"article__p\">Self-lubrication works by microscopic transfer: during contact between the teeth a thin film of material or of additives such as PTFE (polytetrafluoroethylene, commonly known as Teflon), graphite or MoS\u2082 (molybdenum disulfide) forms. This film reduces friction and wear without external lubricants.<\/p>\n<p class=\"article__p\">The materials most used for dry running have different characteristics, suited to different contexts:<\/p>\n<ul class=\"article__list\">\n <li><strong>POM-C<\/strong> (polyoxymethylene): low friction, good dimensional stability, ideal where precision is the priority.<\/li>\n <li><strong>Glass-fiber PA6<\/strong>: high mechanical strength, excellent cost\/performance ratio, suited to higher loads with careful management of the heat generated.<\/li>\n <li><strong>PK<\/strong> (polyketone): good wear resistance, natural self-lubrication and fair thermal stability in moderately aggressive environments.<\/li>\n<\/ul>\n<div class=\"infobox infobox--grey\">\n <div class=\"infobox__title\">\n <svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"14\" height=\"14\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"><path d=\"M14.7 6.3a1 1 0 0 0 0 1.4l1.6 1.6a1 1 0 0 0 1.4 0l3.77-3.77a6 6 0 0 1-7.94 7.94l-6.91 6.91a2.12 2.12 0 0 1-3-3l6.91-6.91a6 6 0 0 1 7.94-7.94l-3.76 3.76z\"><\/path><\/svg>\n Technical note\n <\/div>\n <p class=\"infobox__text\">The surface quality and the compatibility between the materials of the paired gears directly affect durability. A poor surface finish increases wear in the run-in phase, even with suitable materials.<\/p>\n<\/div>\n<h2 class=\"article__h2\" id=\"the-pv-parameter-pressure-times-velocity\">\n <span class=\"article__h2-icon\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"16\" height=\"16\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"><path d=\"m12 14 4-4\"><\/path><path d=\"M3.34 19a10 10 0 1 1 17.32 0\"><\/path><\/svg><\/span>\n The PV parameter: pressure times velocity\n<\/h2>\n<p class=\"article__p\">The PV is the product of the contact pressure (P, in N\/mm\u00b2) and the sliding velocity (V, in m\/s). It indicates the combination of load and speed that a gear can withstand dry before the heat generated exceeds the material’s capacity.<\/p>\n<p class=\"article__p\">Technopolymers have low thermal conductivity: the heat produced by friction doesn’t dissipate as quickly as in metal, but accumulates in the tooth. High PV values accelerate wear, deformation and loss of geometric precision.<\/p>\n<div class=\"infobox infobox--grey\">\n <div class=\"infobox__title\">\n <svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"14\" height=\"14\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"><line x1=\"9\" y1=\"18\" x2=\"15\" y2=\"18\"><\/line><line x1=\"10\" y1=\"22\" x2=\"14\" y2=\"22\"><\/line><path d=\"M15.09 14c.18-.98.65-1.74 1.41-2.5A4.65 4.65 0 0 0 18 8 6 6 0 0 0 6 8c0 1 .23 2.23 1.5 3.5A4.61 4.61 0 0 1 8.91 14\"><\/path><\/svg>\n From the field\n <\/div>\n <p class=\"infobox__text\">For continuous-running applications, work at 50-70% of the limit PV value of the chosen material. This margin covers the load variations and thermal fluctuations that occur under the real operating conditions.<\/p>\n<\/div>\n<h2 class=\"article__h2\" id=\"when-dry-running-isnt-enough\">\n <span class=\"article__h2-icon\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"16\" height=\"16\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"><circle cx=\"12\" cy=\"12\" r=\"10\"><\/circle><line x1=\"12\" y1=\"8\" x2=\"12\" y2=\"12\"><\/line><line x1=\"12\" y1=\"16\" x2=\"12.01\" y2=\"16\"><\/line><\/svg><\/span>\n When dry running isn’t enough\n<\/h2>\n<p class=\"article__p\">If load, speed or temperature exceed the PV limit, dry running is no longer sufficient. The signals to monitor are: temperature rise on the housing, abnormal noise, visible wear dust, shiny tooth surfaces or increased <dfn id=\"def-gioco-di-flanchi-backlash\"><span class=\"glossary-term\" data-tooltip=\"tt-gioco-di-flanchi-backlash\" title=\"Free clearance between the flanks of two mating teeth, measured at the pitch circle. It prevents jamming due to thermal expansion or assembly errors.\">backlash<\/span><\/dfn> relative to startup.<\/p>\n<p class=\"article__p\">In these cases, evaluate hybrid solutions:<\/p>\n<ul class=\"article__list\">\n <li>Occasional lubrication with greases compatible with the material.<\/li>\n <li>Pairing different materials to reduce the overall friction coefficient.<\/li>\n <li>Improved heat dissipation with fins, forced ventilation or optimized housing geometries.<\/li>\n<\/ul>\n<h2 class=\"article__h2\" id=\"how-to-orient-yourself-in-choosing-the-material\">\n <span class=\"article__h2-icon\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"16\" height=\"16\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"><circle cx=\"12\" cy=\"12\" r=\"10\"><\/circle><path d=\"M9.09 9a3 3 0 0 1 5.83 1c0 2-3 3-3 3\"><\/path><line x1=\"12\" y1=\"17\" x2=\"12.01\" y2=\"17\"><\/line><\/svg><\/span>\n How to orient yourself in choosing the material\n<\/h2>\n<p class=\"article__p\">PA6, POM-C and PK answer to different application logics. Glass-fiber PA6 offers the highest mechanical strength among the three and an excellent cost\/performance ratio: in applications with high loads it’s often the more robust choice, with heat management addressed at the design stage. POM-C is preferable when dimensional stability is the priority and loads are moderate. PK is suited to chemically aggressive environments or when you want to minimize maintenance.<\/p>\n<p class=\"article__p\">In any case, always verify the limit PV value of the material in the supplier’s datasheets and design with a safety margin adequate to the real conditions, not to the nominal values.<\/p>\n<div class=\"infobox\">\n <div class=\"infobox__title\">\n <svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"14\" height=\"14\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"><path d=\"M4 4h16c1.1 0 2 .9 2 2v12c0 1.1-.9 2-2 2H4c-1.1 0-2-.9-2-2V6c0-1.1.9-2 2-2z\"><\/path><polyline points=\"22,6 12,13 2,6\"><\/polyline><\/svg>\n Ask us\n <\/div>\n <p class=\"infobox__text\">If your application combines high loads, critical temperature and a dry-running requirement, <a href=\"https:\/\/shop.stagnoligears.com\/en\/contacts\/\" target=\"_blank\" rel=\"noopener\" class=\"cta-link\">write<\/a> to the technical office. We assess material, geometry and PV margin together for your specific configuration.<\/p>\n<\/div>\n\n <\/div>\n <\/div>\n <\/div>\n\n\n<script>\n (function () {\n var hideTimers = {};\n function positionTooltip(trigger, tooltip) {\n var margin = 8;\n tooltip.style.visibility = 'hidden';\n tooltip.style.top = '-9999px';\n tooltip.style.left = '-9999px';\n tooltip.removeAttribute('hidden');\n var ttRect = tooltip.getBoundingClientRect();\n var trRect = trigger.getBoundingClientRect();\n var vw = window.innerWidth, vh = window.innerHeight;\n var top = trRect.bottom + margin;\n var left = trRect.left;\n if (top + ttRect.height + margin > vh) {\n var above = trRect.top - ttRect.height - margin;\n top = above >= margin ? above : Math.max(margin, vh - ttRect.height - margin);\n }\n if (left + ttRect.width + margin > vw) left = vw - ttRect.width - margin;\n if (left < margin) left = margin;\n tooltip.style.top = top + 'px';\n tooltip.style.left = left + 'px';\n tooltip.style.visibility = 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cancelHide(ttId); });\n tt.addEventListener('mouseleave', function () { hideTooltip(ttId); });\n });\n })();\n<\/script>\n\n<\/body><\/html>\n","protected":false},"excerpt":{"rendered":"<p>Use of the pressure-velocity factor to define the thermomechanical limit and prevent tooth degradation without lubrication.<\/p>\n","protected":false},"parent":0,"template":"","meta":{"_acf_changed":false},"campo-applicazione":[5463],"categoria-ct":[5449],"class_list":["post-25612","centro-tecnico","type-centro-tecnico","status-publish","hentry","campo-applicazione-maintenance","categoria-ct-operation-maintenance"],"acf":[],"yoast_head":"\n<title>Dry Running of Technopolymer Gears | Stagnoli Gears Shop<\/title>\n<meta name=\"description\" content=\"Discover the advantages and limits of dry running in technopolymer gears, including self-lubrication, wear, overheating risks and the PV parameter.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, 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{"id":25612,"date":"2026-06-30T14:09:12","date_gmt":"2026-06-30T12:09:12","guid":{"rendered":"https:\/\/shop.stagnoligears.com\/?post_type=centro-tecnico&p=25612"},"modified":"2026-07-10T13:54:06","modified_gmt":"2026-07-10T11:54:06","slug":"dry-running-of-technopolymer-gears-advantages-limits-and-the-pv-parameter","status":"publish","type":"centro-tecnico","link":"https:\/\/shop.stagnoligears.com\/en\/technical-hub\/dry-running-of-technopolymer-gears-advantages-limits-and-the-pv-parameter\/","title":{"rendered":"Dry running of technopolymer gears: advantages, limits and the PV parameter"},"content":{"rendered":"\n\n \n \n \n Dry running of technopolymer gears: advantages, limits and the PV parameter<\/title>\n\n <link rel=\"preconnect\" href=\"https:\/\/fonts.googleapis.com\">\n <link rel=\"preconnect\" href=\"https:\/\/fonts.gstatic.com\" crossorigin=\"\">\n <link href=\"https:\/\/fonts.googleapis.com\/css2?family=Inter:wght@400;500;600;700&display=swap\" rel=\"stylesheet\">\n\n <style>\n *, *::before, *::after { box-sizing: border-box; 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}\n\n .badge {\n display: inline-block;\n font-size: 12px;\n font-weight: 600;\n padding: 2px 8px;\n border-radius: 20px;\n background: var(--green-light);\n color: var(--green-dark);\n }\n\n \/* ============================================================\n RESPONSIVE\n ============================================================ *\/\n @media (max-width: 900px) {\n .article-body { flex-direction: column; padding: 20px 20px 48px; }\n }\n \n \/* Glossary tooltips *\/\n .glossary-term {\n border-bottom: 1px dotted var(--green);\n color: var(--green);\n font-style: italic;\n cursor: help;\n }\n .glossary-tooltip {\n position: fixed;\n z-index: 9999;\n background: #fff;\n border: 1px solid var(--border-mid);\n border-radius: var(--radius-md);\n box-shadow: var(--shadow-md);\n padding: 10px 14px;\n max-width: 300px;\n font-family: 'Inter', sans-serif;\n font-size: 13px;\n }\n .glossary-tooltip__title {\n font-weight: 600;\n color: var(--text-primary);\n margin-bottom: 4px;\n }\n .glossary-tooltip__def {\n font-size: 12.5px;\n color: var(--text-secondary);\n line-height: 1.6;\n }\n .glossary-tooltip__tag {\n display: inline-block;\n margin-top: 6px;\n font-size: 9px;\n font-weight: 600;\n padding: 2px 7px;\n border-radius: 20px;\n background: var(--green-light);\n color: var(--green-dark);\n text-transform: uppercase;\n letter-spacing: 0.04em;\n }\n\n <\/style>\n<\/head>\n<body>\n\n<div id=\"tt-gioco-di-flanchi-backlash\" class=\"glossary-tooltip\" hidden=\"\">\n <div class=\"glossary-tooltip__title\">Backlash<\/div>\n <div class=\"glossary-tooltip__def\">Free clearance between the flanks of two mating teeth, measured at the pitch circle. It prevents jamming due to thermal expansion or assembly errors.<\/div>\n <span class=\"glossary-tooltip__tag\">Glossary<\/span>\n<\/div>\n\n <div class=\"article-page\">\n <div class=\"article-body\">\n <div class=\"article-body__main\"><script type=\"application\/ld+json\">\n{\n \"@context\": \"https:\/\/schema.org\",\n \"@graph\": [\n {\n \"@type\": \"TechArticle\",\n \"@id\": \"#article\",\n \"headline\": \"Dry running of technopolymer gears: advantages, limits and the PV parameter\",\n \"description\": \"A gear that turns without oil, without grease, without scheduled maintenance. For those who design food, medical or automation machines, it's often the starting requirement. Technopolymers make it possible, but within precise limits: exceeding them means accelerated wear, overheating and early failure.\",\n \"inLanguage\": \"en\",\n \"mentions\": [\n {\n \"@id\": \"#term-gioco-di-flanchi-backlash\"\n }\n ]\n },\n {\n \"@type\": \"DefinedTermSet\",\n \"@id\": \"#glossario\",\n \"name\": \"Glossario - Dry running of technopolymer gears: advantages, limits and the PV parameter\",\n \"hasDefinedTerm\": [\n {\n \"@type\": \"DefinedTerm\",\n \"@id\": \"#term-gioco-di-flanchi-backlash\",\n \"name\": \"Backlash\",\n \"description\": \"Free clearance between the flanks of two mating teeth, measured at the pitch circle. It prevents jamming due to thermal expansion or assembly errors.\",\n \"inDefinedTermSet\": \"#glossario\"\n }\n ]\n }\n ]\n}\n<\/script>\n\n\n\n <h1 class=\"article__title\">Dry running of technopolymer gears: advantages, limits and the PV parameter<\/h1>\n<p class=\"article__subtitle\">A gear that turns without oil, without grease, without scheduled maintenance. For those who design food, medical or automation machines, it’s often the starting requirement. Technopolymers make it possible, but within precise limits: exceeding them means accelerated wear, overheating and early failure.<\/p>\n<h2 class=\"article__h2\" id=\"dry-running-in-technopolymers\">\n <span class=\"article__h2-icon\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"16\" height=\"16\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"><path d=\"M17.7 7.7a2.5 2.5 0 1 1 1.8 4.3H2\"><\/path><path d=\"M9.6 4.6A2 2 0 1 1 11 8H2\"><\/path><path d=\"M12.6 19.4A2 2 0 1 0 14 16H2\"><\/path><\/svg><\/span>\n Dry running in technopolymers\n<\/h2>\n<p class=\"article__p\">Metal gears require oil or grease to limit friction and wear. Technopolymer ones can work without external lubrication, provided the design respects the material’s tribological limits. The advantage isn’t only operational: less lubricant means less contamination, less maintenance and cleaner work environments. In many industrial applications, replacing metal with technopolymer (metal replacement) also reduces weight, transport costs and environmental impact.<\/p>\n<div class=\"warnbox\">\n <div class=\"warnbox__title\">\n <svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"14\" height=\"14\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"><path d=\"M10.29 3.86L1.82 18a2 2 0 0 0 1.71 3h16.94a2 2 0 0 0 1.71-3L13.71 3.86a2 2 0 0 0-3.42 0z\"><\/path><line x1=\"12\" y1=\"9\" x2=\"12\" y2=\"13\"><\/line><line x1=\"12\" y1=\"17\" x2=\"12.01\" y2=\"17\"><\/line><\/svg>\n Warning\n <\/div>\n <p class=\"warnbox__text\">Dry running isn’t a default condition that’s always valid. If load, speed or temperature leave the specification, the risk is overheating and irreversible damage to the teeth.<\/p>\n<\/div>\n<h2 class=\"article__h2\" id=\"self-lubricating-properties-of-technopolymers\">\n <span class=\"article__h2-icon\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"16\" height=\"16\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"><polygon points=\"12 2 2 7 12 12 22 7 12 2\"><\/polygon><polyline points=\"2 17 12 22 22 17\"><\/polyline><polyline points=\"2 12 12 17 22 12\"><\/polyline><\/svg><\/span>\n Self-lubricating properties of technopolymers\n<\/h2>\n<p class=\"article__p\">Self-lubrication works by microscopic transfer: during contact between the teeth a thin film of material or of additives such as PTFE (polytetrafluoroethylene, commonly known as Teflon), graphite or MoS\u2082 (molybdenum disulfide) forms. This film reduces friction and wear without external lubricants.<\/p>\n<p class=\"article__p\">The materials most used for dry running have different characteristics, suited to different contexts:<\/p>\n<ul class=\"article__list\">\n <li><strong>POM-C<\/strong> (polyoxymethylene): low friction, good dimensional stability, ideal where precision is the priority.<\/li>\n <li><strong>Glass-fiber PA6<\/strong>: high mechanical strength, excellent cost\/performance ratio, suited to higher loads with careful management of the heat generated.<\/li>\n <li><strong>PK<\/strong> (polyketone): good wear resistance, natural self-lubrication and fair thermal stability in moderately aggressive environments.<\/li>\n<\/ul>\n<div class=\"infobox infobox--grey\">\n <div class=\"infobox__title\">\n <svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"14\" height=\"14\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"><path d=\"M14.7 6.3a1 1 0 0 0 0 1.4l1.6 1.6a1 1 0 0 0 1.4 0l3.77-3.77a6 6 0 0 1-7.94 7.94l-6.91 6.91a2.12 2.12 0 0 1-3-3l6.91-6.91a6 6 0 0 1 7.94-7.94l-3.76 3.76z\"><\/path><\/svg>\n Technical note\n <\/div>\n <p class=\"infobox__text\">The surface quality and the compatibility between the materials of the paired gears directly affect durability. A poor surface finish increases wear in the run-in phase, even with suitable materials.<\/p>\n<\/div>\n<h2 class=\"article__h2\" id=\"the-pv-parameter-pressure-times-velocity\">\n <span class=\"article__h2-icon\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"16\" height=\"16\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"><path d=\"m12 14 4-4\"><\/path><path d=\"M3.34 19a10 10 0 1 1 17.32 0\"><\/path><\/svg><\/span>\n The PV parameter: pressure times velocity\n<\/h2>\n<p class=\"article__p\">The PV is the product of the contact pressure (P, in N\/mm\u00b2) and the sliding velocity (V, in m\/s). It indicates the combination of load and speed that a gear can withstand dry before the heat generated exceeds the material’s capacity.<\/p>\n<p class=\"article__p\">Technopolymers have low thermal conductivity: the heat produced by friction doesn’t dissipate as quickly as in metal, but accumulates in the tooth. High PV values accelerate wear, deformation and loss of geometric precision.<\/p>\n<div class=\"infobox infobox--grey\">\n <div class=\"infobox__title\">\n <svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"14\" height=\"14\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"><line x1=\"9\" y1=\"18\" x2=\"15\" y2=\"18\"><\/line><line x1=\"10\" y1=\"22\" x2=\"14\" y2=\"22\"><\/line><path d=\"M15.09 14c.18-.98.65-1.74 1.41-2.5A4.65 4.65 0 0 0 18 8 6 6 0 0 0 6 8c0 1 .23 2.23 1.5 3.5A4.61 4.61 0 0 1 8.91 14\"><\/path><\/svg>\n From the field\n <\/div>\n <p class=\"infobox__text\">For continuous-running applications, work at 50-70% of the limit PV value of the chosen material. This margin covers the load variations and thermal fluctuations that occur under the real operating conditions.<\/p>\n<\/div>\n<h2 class=\"article__h2\" id=\"when-dry-running-isnt-enough\">\n <span class=\"article__h2-icon\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"16\" height=\"16\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"><circle cx=\"12\" cy=\"12\" r=\"10\"><\/circle><line x1=\"12\" y1=\"8\" x2=\"12\" y2=\"12\"><\/line><line x1=\"12\" y1=\"16\" x2=\"12.01\" y2=\"16\"><\/line><\/svg><\/span>\n When dry running isn’t enough\n<\/h2>\n<p class=\"article__p\">If load, speed or temperature exceed the PV limit, dry running is no longer sufficient. The signals to monitor are: temperature rise on the housing, abnormal noise, visible wear dust, shiny tooth surfaces or increased <dfn id=\"def-gioco-di-flanchi-backlash\"><span class=\"glossary-term\" data-tooltip=\"tt-gioco-di-flanchi-backlash\" title=\"Free clearance between the flanks of two mating teeth, measured at the pitch circle. It prevents jamming due to thermal expansion or assembly errors.\">backlash<\/span><\/dfn> relative to startup.<\/p>\n<p class=\"article__p\">In these cases, evaluate hybrid solutions:<\/p>\n<ul class=\"article__list\">\n <li>Occasional lubrication with greases compatible with the material.<\/li>\n <li>Pairing different materials to reduce the overall friction coefficient.<\/li>\n <li>Improved heat dissipation with fins, forced ventilation or optimized housing geometries.<\/li>\n<\/ul>\n<h2 class=\"article__h2\" id=\"how-to-orient-yourself-in-choosing-the-material\">\n <span class=\"article__h2-icon\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"16\" height=\"16\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"><circle cx=\"12\" cy=\"12\" r=\"10\"><\/circle><path d=\"M9.09 9a3 3 0 0 1 5.83 1c0 2-3 3-3 3\"><\/path><line x1=\"12\" y1=\"17\" x2=\"12.01\" y2=\"17\"><\/line><\/svg><\/span>\n How to orient yourself in choosing the material\n<\/h2>\n<p class=\"article__p\">PA6, POM-C and PK answer to different application logics. Glass-fiber PA6 offers the highest mechanical strength among the three and an excellent cost\/performance ratio: in applications with high loads it’s often the more robust choice, with heat management addressed at the design stage. POM-C is preferable when dimensional stability is the priority and loads are moderate. PK is suited to chemically aggressive environments or when you want to minimize maintenance.<\/p>\n<p class=\"article__p\">In any case, always verify the limit PV value of the material in the supplier’s datasheets and design with a safety margin adequate to the real conditions, not to the nominal values.<\/p>\n<div class=\"infobox\">\n <div class=\"infobox__title\">\n <svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"14\" height=\"14\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"><path d=\"M4 4h16c1.1 0 2 .9 2 2v12c0 1.1-.9 2-2 2H4c-1.1 0-2-.9-2-2V6c0-1.1.9-2 2-2z\"><\/path><polyline points=\"22,6 12,13 2,6\"><\/polyline><\/svg>\n Ask us\n <\/div>\n <p class=\"infobox__text\">If your application combines high loads, critical temperature and a dry-running requirement, <a href=\"https:\/\/shop.stagnoligears.com\/en\/contacts\/\" target=\"_blank\" rel=\"noopener\" class=\"cta-link\">write<\/a> to the technical office. We assess material, geometry and PV margin together for your specific configuration.<\/p>\n<\/div>\n\n <\/div>\n <\/div>\n <\/div>\n\n\n<script>\n (function () {\n var hideTimers = {};\n function positionTooltip(trigger, tooltip) {\n var margin = 8;\n tooltip.style.visibility = 'hidden';\n tooltip.style.top = '-9999px';\n tooltip.style.left = '-9999px';\n tooltip.removeAttribute('hidden');\n var ttRect = tooltip.getBoundingClientRect();\n var trRect = trigger.getBoundingClientRect();\n var vw = window.innerWidth, vh = window.innerHeight;\n var top = trRect.bottom + margin;\n var left = trRect.left;\n if (top + ttRect.height + margin > vh) {\n var above = trRect.top - ttRect.height - margin;\n top = above >= margin ? above : Math.max(margin, vh - ttRect.height - margin);\n }\n if (left + ttRect.width + margin > vw) left = vw - ttRect.width - margin;\n if (left < margin) left = margin;\n tooltip.style.top = top + 'px';\n tooltip.style.left = left + 'px';\n tooltip.style.visibility = '';\n }\n function showTooltip(ttId, trigger) {\n if (hideTimers[ttId]) { clearTimeout(hideTimers[ttId]); hideTimers[ttId] = null; }\n positionTooltip(trigger, document.getElementById(ttId));\n }\n function hideTooltip(ttId) {\n hideTimers[ttId] = setTimeout(function () {\n var tt = document.getElementById(ttId);\n if (tt) tt.setAttribute('hidden', '');\n hideTimers[ttId] = null;\n }, 180);\n }\n function cancelHide(ttId) {\n if (hideTimers[ttId]) { clearTimeout(hideTimers[ttId]); hideTimers[ttId] = null; }\n }\n document.querySelectorAll('[data-tooltip]').forEach(function (trigger) {\n var ttId = trigger.getAttribute('data-tooltip');\n trigger.addEventListener('mouseenter', function () { showTooltip(ttId, trigger); });\n trigger.addEventListener('mouseleave', function () { hideTooltip(ttId); });\n });\n ['tt-gioco-di-flanchi-backlash'].forEach(function (ttId) {\n var tt = document.getElementById(ttId);\n if (!tt) return;\n tt.addEventListener('mouseenter', function () { cancelHide(ttId); });\n tt.addEventListener('mouseleave', function () { hideTooltip(ttId); });\n });\n })();\n<\/script>\n\n<\/body><\/html>\n","protected":false},"excerpt":{"rendered":"<p>Use of the pressure-velocity factor to define the thermomechanical limit and prevent tooth degradation without lubrication.<\/p>\n","protected":false},"parent":0,"template":"","meta":{"_acf_changed":false},"campo-applicazione":[5463],"categoria-ct":[5449],"class_list":["post-25612","centro-tecnico","type-centro-tecnico","status-publish","hentry","campo-applicazione-maintenance","categoria-ct-operation-maintenance"],"acf":[],"yoast_head":"\n<title>Dry Running of Technopolymer Gears | Stagnoli Gears Shop<\/title>\n<meta name=\"description\" content=\"Discover the advantages and limits of dry running in technopolymer gears, including self-lubrication, wear, overheating risks and the PV parameter.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, 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