{"id":1064,"date":"2026-07-17T14:22:37","date_gmt":"2026-07-17T06:22:37","guid":{"rendered":"https:\/\/bastone-petrochem.com\/?p=1064"},"modified":"2026-08-13T09:26:52","modified_gmt":"2026-08-13T01:26:52","slug":"melting-point-polypropylene","status":"publish","type":"post","link":"https:\/\/bastone-petrochem.com\/es\/melting-point-polypropylene\/","title":{"rendered":"\u00bfCu\u00e1l es el punto de fusi\u00f3n del polipropileno?"},"content":{"rendered":"<p class=\"wp-block-paragraph\">Una hoja de datos de polipropileno generalmente incluye cuatro temperaturas: un punto de fusi\u00f3n cerca de 165\u00b0C, un HDT cerca de 85\u00b0C, un Vicat cerca de 100\u00b0C y una cifra de uso continuo cerca de 90\u00b0C. Para un comprador que revisa el COA, todas se leen como \u201cel l\u00edmite de calor\u201d.\u201d<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Solo una de ellas te indica qu\u00e9 tan caliente puede funcionar la pieza en la l\u00ednea, y leer la incorrecta es c\u00f3mo una pieza se especifica para un servicio que no puede soportar. El punto de fusi\u00f3n es el n\u00famero f\u00e1cil de citar; el trabajo \u00fatil es saber cu\u00e1l de esos cuatro gobierna cada decisi\u00f3n.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u00bfCu\u00e1l es el punto de fusi\u00f3n del polipropileno por grado?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">El polipropileno se funde aproximadamente entre 160 y 170\u00b0C (320 a 338\u00b0F), y d\u00f3nde se sit\u00faa un grado dado dentro de esa banda est\u00e1 determinado por c\u00f3mo se polimeriza. El homopol\u00edmero isot\u00e1ctico se encuentra en la parte superior, alrededor de 162 a 170\u00b0C, porque su cadena regular se empaqueta en una cristalinidad del 40 al 60%. Un grado de referencia de homopol\u00edmero como T30S ancla ese extremo superior.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">El copol\u00edmero aleatorio (PP-R) funciona m\u00e1s bajo, aproximadamente de 130 a 165\u00b0C, dependiendo de cu\u00e1nto etileno est\u00e9 incorporado en la cadena. El comon\u00f3mero interrumpe la red cristalina, reduce la cristalinidad al 30-40% y reduce el punto de fusi\u00f3n con \u00e9l.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">PetroChina Dushanzi T4401, un grado de tuber\u00eda de copol\u00edmero aleatorio, se encuentra en este extremo inferior de Tm, que es exactamente por qu\u00e9 su ventana de procesamiento de PP-R <a href=\"https:\/\/bastone-petrochem.com\/es\/product\/pp-t4401\/\">se desplaza hacia abajo<\/a> en relaci\u00f3n con un homopol\u00edmero. El copol\u00edmero de impacto (en bloque) se encuentra en el medio, alrededor de 150 a 165\u00b0C.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">El calificador de grado tiene m\u00e1s peso que el rango principal. Si una especificaci\u00f3n solo dice \u201cPP, Tm 165\u00b0C\u201d, confirma si es homopol\u00edmero, aleatorio o de impacto antes de tratar ese n\u00famero como fijo. El <a href=\"https:\/\/bastone-petrochem.com\/es\/decide-between-three-main-grades-polypropylene-resin\/\">grado en s\u00ed mismo mueve el punto de fusi\u00f3n<\/a> en 20 a 30\u00b0C.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u00bfQu\u00e9 n\u00famero gobierna la resistencia al calor: punto de fusi\u00f3n, HDT, Vicat o temperatura de servicio?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">La temperatura de servicio continuo \u2014 no el punto de fusi\u00f3n \u2014 establece qu\u00e9 tan caliente puede funcionar una pieza de PP a largo plazo, y para PP sin relleno, ese techo es aproximadamente de 80 a 100\u00b0C. Una pieza mantenida cerca de su punto de fusi\u00f3n de 165\u00b0C se hunde y fluye bajo su propio peso mucho antes de que algo se lic\u00fae.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Esa brecha entre fusi\u00f3n y servicio es el titular de d\u00f3nde se sit\u00faa el PP entre los pl\u00e1sticos, y el <a href=\"https:\/\/bastone-petrochem.com\/es\/polypropylene-vs-plastic-family\/\">posicionamiento del PP entre los pl\u00e1sticos<\/a> lo cubre en su totalidad; aqu\u00ed el trabajo es separar los cuatro n\u00fameros que una hoja de datos realmente te proporciona.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Cada uno gobierna un l\u00edmite diferente, medido bajo una carga diferente:<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"1376\" height=\"768\" src=\"https:\/\/bastone-petrochem.com\/wp-content\/uploads\/2026\/06\/what-is-the-melting-point-of-polypropylene-1.png\" alt=\"Tres configuraciones de pruebas t\u00e9rmicas detr\u00e1s del punto de fusi\u00f3n del polipropileno: deflexi\u00f3n por calor, ablandamiento Vicat y flujo de fusi\u00f3n\" class=\"wp-image-1062\" srcset=\"https:\/\/bastone-petrochem.com\/wp-content\/uploads\/2026\/06\/what-is-the-melting-point-of-polypropylene-1.png 1376w, https:\/\/bastone-petrochem.com\/wp-content\/uploads\/2026\/06\/what-is-the-melting-point-of-polypropylene-1-300x167.png 300w, https:\/\/bastone-petrochem.com\/wp-content\/uploads\/2026\/06\/what-is-the-melting-point-of-polypropylene-1-1024x572.png 1024w, https:\/\/bastone-petrochem.com\/wp-content\/uploads\/2026\/06\/what-is-the-melting-point-of-polypropylene-1-768x429.png 768w, https:\/\/bastone-petrochem.com\/wp-content\/uploads\/2026\/06\/what-is-the-melting-point-of-polypropylene-1-18x10.png 18w, https:\/\/bastone-petrochem.com\/wp-content\/uploads\/2026\/06\/what-is-the-melting-point-of-polypropylene-1-600x335.png 600w\" sizes=\"auto, (max-width: 1376px) 100vw, 1376px\" \/><\/figure>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>N\u00famero t\u00e9rmico<\/th><th>Valor t\u00edpico (PP sin relleno)<\/th><th>Condici\u00f3n de prueba<\/th><th>Lo que gobierna<\/th><\/tr><\/thead><tbody><tr><td>Punto de fusi\u00f3n (Tm)<\/td><td>160-170\u00b0C<\/td><td>Pico DSC<\/td><td>Base de procesamiento \u2014 donde la resina comienza a fluir<\/td><\/tr><tr><td>Deflexi\u00f3n por calor (HDT)<\/td><td>~85\u00b0C a 1.8 MPa<\/td><td>ASTM D648 \/ ISO 75, flexi\u00f3n en tres puntos<\/td><td>L\u00edmite de servicio con carga<\/td><\/tr><tr><td>Ablandamiento Vicat (VST)<\/td><td>~5-15\u00b0C por encima del HDT<\/td><td>ASTM D1525 \/ ISO 306, aguja de 10N o 50N<\/td><td>Ablandamiento superficial, eyecci\u00f3n segura<\/td><\/tr><tr><td>Servicio continuo<\/td><td>80-100\u00b0C<\/td><td>Exposici\u00f3n a largo plazo<\/td><td>Techo de uso sostenido<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">El HDT bajo ASTM D648 carga una barra en flexi\u00f3n de tres puntos a 0.45 o 1.8 MPa y la calienta hasta que se desv\u00eda 0.25 mm. La cifra de 1.8 MPa para PP sin relleno es de aproximadamente 85\u00b0C \u2014 y ese es el n\u00famero que un ingeniero de dise\u00f1o debe citar para una pieza que soporta carga, no el punto de fusi\u00f3n.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">La carga m\u00e1s ligera de 0.45 MPa da una lectura m\u00e1s alta porque hay menos tensi\u00f3n que superar.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">El Vicat mide algo m\u00e1s estrecho: una aguja plana presiona 1 mm en la superficie bajo una carga puntual de 10N (M\u00e9todo A) o 50N (M\u00e9todo B). Marca d\u00f3nde comienza a ablandarse la superficie, \u00fatil para establecer una temperatura de eyecci\u00f3n segura, donde deseas que la piel est\u00e9 lo suficientemente firme para desmoldar sin deformaci\u00f3n.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Generalmente se sit\u00faa de 5 a 15\u00b0C por encima del HDT para el mismo grado.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">El compuesto cambia todo esto. El refuerzo de fibra de vidrio eleva el HDT del rango sin relleno de ~90-120\u00b0C a 130-145\u00b0C, por lo que el n\u00famero de servicio que gobierna depende de la formulaci\u00f3n, no solo del pol\u00edmero base.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u00bfQu\u00e9 temperaturas de barril y molde debe establecer un moldeador para PP?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Un moldeador opera la masa fundida a 200 a 250\u00b0C (400 a 470\u00b0F) \u2014 de 30 a 90\u00b0C por encima del punto de fusi\u00f3n, no en \u00e9l. Un punto de partida t\u00edpico del productor (Formosa Formolene) coloca las zonas del barril aproximadamente a 199-227\u00b0C trasero, 199-232\u00b0C medio y 199-250\u00b0C delantero, con la masa fundida verificada en la boquilla mediante un disparo al aire.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"1376\" height=\"768\" src=\"https:\/\/bastone-petrochem.com\/wp-content\/uploads\/2026\/06\/what-is-the-melting-point-of-polypropylene-2.png\" alt=\"Gradiente de temperatura del barril y molde de moldeo por inyecci\u00f3n para procesar polipropileno por encima de su punto de fusi\u00f3n\" class=\"wp-image-1063\" srcset=\"https:\/\/bastone-petrochem.com\/wp-content\/uploads\/2026\/06\/what-is-the-melting-point-of-polypropylene-2.png 1376w, https:\/\/bastone-petrochem.com\/wp-content\/uploads\/2026\/06\/what-is-the-melting-point-of-polypropylene-2-300x167.png 300w, https:\/\/bastone-petrochem.com\/wp-content\/uploads\/2026\/06\/what-is-the-melting-point-of-polypropylene-2-1024x572.png 1024w, https:\/\/bastone-petrochem.com\/wp-content\/uploads\/2026\/06\/what-is-the-melting-point-of-polypropylene-2-768x429.png 768w, https:\/\/bastone-petrochem.com\/wp-content\/uploads\/2026\/06\/what-is-the-melting-point-of-polypropylene-2-18x10.png 18w, https:\/\/bastone-petrochem.com\/wp-content\/uploads\/2026\/06\/what-is-the-melting-point-of-polypropylene-2-600x335.png 600w\" sizes=\"auto, (max-width: 1376px) 100vw, 1376px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">El sobrecalentamiento no es desperdicio. Un pol\u00edmero que est\u00e1 justo en su punto de fusi\u00f3n solo est\u00e1 parcialmente fundido y es demasiado viscoso para llenar una cavidad limpiamente \u2014 obtienes disparos cortos, l\u00edneas de soldadura d\u00e9biles y tensi\u00f3n bloqueada. Agregar 30 a 90\u00b0C reduce la viscosidad lo suficiente para un flujo consistente.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">La temperatura del molde es el extremo opuesto de la ventana: 15 a 50\u00b0C (60 a 120\u00b0F). La herramienta funciona fr\u00eda para solidificar la pieza, y esa velocidad de enfriamiento tambi\u00e9n fija la cristalinidad final. Ejecuta el molde m\u00e1s caliente y permites que se desarrolle m\u00e1s estructura cristalina, lo que endurece la pieza pero ralentiza el ciclo.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">El grado y el relleno desplazan la ventana de la misma manera que desplazan la Tm. Los grados puros fluyen alrededor de 190-210\u00b0C, los rellenos de talco m\u00e1s alto, los rellenos de vidrio cerca de 230-240\u00b0C. No transfieras los puntos de ajuste de un grado a otro sin volver a verificar \u2014 la Tm m\u00e1s baja de un copol\u00edmero aleatorio significa que su ventana se abre a una temperatura de barril m\u00e1s baja que la de un homopol\u00edmero.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Leyendo los Cuatro N\u00fameros en la Pr\u00e1ctica<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Cita el punto de fusi\u00f3n con su grado \u2014 homopol\u00edmero cerca de 165-170\u00b0C, copol\u00edmero aleatorio m\u00e1s bajo \u2014 pero nunca lo uses para juzgar el calor de servicio. Para una pieza que soporta carga, el n\u00famero que importa es el HDT (~85\u00b0C a 1.8 MPa para PP sin relleno); para exposici\u00f3n sostenida, es el techo de servicio continuo de 80-100\u00b0C; para desmoldeo, es el Vicat.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">El punto de fusi\u00f3n solo te indica d\u00f3nde comienza el procesamiento. El COA te da cuatro n\u00fameros; la aplicaci\u00f3n te dice qu\u00e9 esquina de la ventana realmente necesitas.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">La lectura err\u00f3nea m\u00e1s costosa es tratar una Tm de 165\u00b0C como una clasificaci\u00f3n de servicio \u2014 una pieza operada cerca de esa cifra se deforma mientras a\u00fan est\u00e1 s\u00f3lida. Empareja el l\u00edmite con la carga, no con el n\u00famero m\u00e1s grande en la hoja.<\/p>","protected":false},"excerpt":{"rendered":"<p>A polypropylene data sheet usually carries four temperatures \u2014 a melt point near 165\u00b0C, an HDT near 85\u00b0C, a Vicat near 100\u00b0C, and a continuous-use figure near 90\u00b0C. To a buyer scanning the COA, they all read like &#8220;the heat limit.&#8221; Only one of them tells you how hot the part can run on the [&hellip;]<\/p>\n","protected":false},"author":4,"featured_media":1062,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[1],"tags":[],"class_list":["post-1064","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-uncategorized"],"blocksy_meta":[],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v25.9 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>What&#039;s the Melting Point of Polypropylene? - BASTONE<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/bastone-petrochem.com\/es\/melting-point-polypropylene\/\" \/>\n<meta property=\"og:locale\" content=\"es_ES\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"What&#039;s the Melting Point of Polypropylene? - BASTONE\" \/>\n<meta property=\"og:description\" content=\"A polypropylene data sheet usually carries four temperatures \u2014 a melt point near 165\u00b0C, an HDT near 85\u00b0C, a Vicat near 100\u00b0C, and a continuous-use figure near 90\u00b0C. To a buyer scanning the COA, they all read like &#8220;the heat limit.&#8221; Only one of them tells you how hot the part can run on the [&hellip;]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/bastone-petrochem.com\/es\/melting-point-polypropylene\/\" \/>\n<meta property=\"og:site_name\" content=\"BASTONE\" \/>\n<meta property=\"article:published_time\" content=\"2026-07-17T06:22:37+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2026-08-13T01:26:52+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/bastone-petrochem.com\/wp-content\/uploads\/2026\/06\/what-is-the-melting-point-of-polypropylene-1.png\" \/>\n\t<meta property=\"og:image:width\" content=\"1376\" \/>\n\t<meta property=\"og:image:height\" content=\"768\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/png\" \/>\n<meta name=\"author\" content=\"Stoneexpert\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/bastone-petrochem.com\/melting-point-polypropylene\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/bastone-petrochem.com\/melting-point-polypropylene\/\"},\"author\":{\"name\":\"Stoneexpert\",\"@id\":\"https:\/\/bastone-petrochem.com\/#\/schema\/person\/e7ac5c8da49e0875ec220147ea11b63b\"},\"headline\":\"What&#8217;s the Melting Point of Polypropylene?\",\"datePublished\":\"2026-07-17T06:22:37+00:00\",\"dateModified\":\"2026-08-13T01:26:52+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/bastone-petrochem.com\/melting-point-polypropylene\/\"},\"wordCount\":939,\"publisher\":{\"@id\":\"https:\/\/bastone-petrochem.com\/#organization\"},\"image\":{\"@id\":\"https:\/\/bastone-petrochem.com\/melting-point-polypropylene\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/bastone-petrochem.com\/wp-content\/uploads\/2026\/06\/what-is-the-melting-point-of-polypropylene-1.png\",\"articleSection\":[\"Uncategorized\"],\"inLanguage\":\"es\"},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/bastone-petrochem.com\/melting-point-polypropylene\/\",\"url\":\"https:\/\/bastone-petrochem.com\/melting-point-polypropylene\/\",\"name\":\"What's the Melting Point of Polypropylene? 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- BASTONE","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/bastone-petrochem.com\/es\/melting-point-polypropylene\/","og_locale":"es_ES","og_type":"article","og_title":"What's the Melting Point of Polypropylene? - BASTONE","og_description":"A polypropylene data sheet usually carries four temperatures \u2014 a melt point near 165\u00b0C, an HDT near 85\u00b0C, a Vicat near 100\u00b0C, and a continuous-use figure near 90\u00b0C. 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