{"id":2287,"date":"2011-06-09T16:23:44","date_gmt":"2011-06-09T21:23:44","guid":{"rendered":"https:\/\/www.parrinst.com\/?page_id=2287"},"modified":"2013-02-13T16:06:08","modified_gmt":"2013-02-13T22:06:08","slug":"the-nature-of-ptfe","status":"publish","type":"page","link":"https:\/\/www.parrinst.com\/es\/products\/sample-preparation\/acid-digestion\/design-features\/the-nature-of-ptfe\/","title":{"rendered":"La Naturaleza del PTFE"},"content":{"rendered":"<p>El uso de PTFE para la copa de muestra en estas bombas es una opci\u00f3n obvia, no s\u00f3lo debido a su inertica \u00fanica a \u00e1cidos fuertes y altas temperaturas, sino tambi\u00e9n porque es transparente a la energ\u00eda de microondas, permitiendo que la energ\u00eda fluya directamente a la muestra y sirviendo tambi\u00e9n como un aislante para restringir el flujo de calor de la zona de reacci\u00f3n. Sin embargo, el PTFE, tienen dos caracter\u00edsticas que lo convierten en algo menos que perfecto para esta aplicaci\u00f3n, y el usuario que entiende estas deficiencias ser\u00e1 capaz de minimizar su efecto en su trabajo.<\/p>\n<p>En primer lugar, PTFE tiene una tendencia a deslizarse o fluir bajo presi\u00f3n o carga. Esta tendencia est\u00e1 presente incluso a temperatura ambiente y se acent\u00faa a temperaturas m\u00e1s altas. A temperaturas inferiores a 150\u00b0C, la tendencia a deslizarse ser\u00e1 insignificante. Pero cuando las temperaturas se elevan por arriba de 150\u00b0C el efecto fluencia ser\u00e1n m\u00e1s pronunciado, lo que hace m\u00e1s dif\u00edcil mantener un sellado herm\u00e9tico y resulta en una deformaci\u00f3n y una vida m\u00e1s corta para los componentes de PTFE. La magnitud del efecto fluencia ser\u00e1 aproximadamente proporcional a la temperatura m\u00e1xima de operaci\u00f3n.<\/p>\n<p>En segundo lugar, el PTFE es un material poroso. Aunque los materiales y dise\u00f1os utilizados en bombas de digesti\u00f3n \u00e1cida Parr minimizan los efectos de su porosidad, los usuarios de estas bombas pueden esperar ver la evidencia de migraci\u00f3n de vapor por el sello de la tapa y a trav\u00e9s de la pared del propio revestimiento. Parr es capaz de minimizar estos problemas mecanizando estas partes de PTFE virgen que se ha moldeado a una presi\u00f3n \u00f3ptima seleccionada para reducir cualquier porosidad a un m\u00ednimo absoluto. Las paredes gruesas y sellos efectivos usados en estas bombas tambi\u00e9n ayudan a superar estas propiedades indeseables. Los experimentos han demostrado que la cantidad de soluto perdido de esta manera durante una digesti\u00f3n normal es insignificante, pero habr\u00e1 migraci\u00f3n del vapor a las paredes de la copa de PTFE y no puede evitarse.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>El uso de PTFE para la copa de muestra en estas bombas es una opci\u00f3n obvia, no s\u00f3lo debido a su inertica \u00fanica a \u00e1cidos fuertes y altas temperaturas, sino tambi\u00e9n porque es transparente a la energ\u00eda de microondas, permitiendo que la energ\u00eda fluya directamente a la muestra y sirviendo tambi\u00e9n como un aislante para [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":37722,"parent":694,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_acf_changed":false,"footnotes":"","_links_to":"","_links_to_target":""},"class_list":["post-2287","page","type-page","status-publish","has-post-thumbnail","hentry"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - 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