{"id":2672,"date":"2025-06-06T14:41:11","date_gmt":"2025-06-06T06:41:11","guid":{"rendered":"https:\/\/joobond.com\/?p=2672"},"modified":"2025-06-06T14:54:57","modified_gmt":"2025-06-06T06:54:57","slug":"sellador-de-poliuretano-frente-a-sellador-de-silicona","status":"publish","type":"post","link":"https:\/\/joobond.com\/es\/sellador-de-poliuretano-frente-a-sellador-de-silicona\/","title":{"rendered":"Sellante de Poliuretano vs Sellante de Silicona: La gu\u00eda definitiva para profesionales"},"content":{"rendered":"

En este Una vez que aprendan las diferencias b\u00e1sicas entre los dos productos altamente eficaces, cualquier profesional podr\u00e1 determinar exactamente cu\u00e1l de ellos es el adecuado para su proyecto.<\/p>\n

Deje de dudar sobre qu\u00e9 sellador utilizar. Si elige mal, se enfrentar\u00e1 a fugas, grietas y costosas devoluciones. Esta gu\u00eda, el principal recurso del sector, contiene informaci\u00f3n cient\u00edfica y conocimientos pr\u00e1cticos para tomar siempre la mejor decisi\u00f3n, basada en las normas ASTM y con m\u00e1s de 20 a\u00f1os de experiencia en el sector.<\/p>\n

 <\/p>\n

La ciencia de los sellantes: Por qu\u00e9 es importante<\/h2>\n

(Lo atribuyen a contratistas capacitados; la mayor\u00eda no lo hace, y luego se preguntan por qu\u00e9 fall\u00f3 su sellador).<\/p>\n

 <\/p>\n\n\n\n\n\n\n\n\n\n\n\n
Propiedad<\/strong><\/td>\nSellante de poliuretano<\/strong><\/td>\nSellante de silicona<\/strong><\/td>\nGanador<\/strong><\/td>\n<\/tr>\n<\/thead>\n
Estructura qu\u00edmica<\/td>\nCadenas de pol\u00edmeros org\u00e1nicos (enlaces N-C=O)<\/td>\nEspina dorsal inorg\u00e1nica de silicona-ox\u00edgeno (Si-O-Si)<\/td>\n-<\/td>\n<\/tr>\n
Flexibilidad<\/td>\nSe vuelve quebradizo por debajo de 40°F<br>(Prueba de unión en frío ASTM C719)<\/td>\nPermanece flexible de -76°F a 400°F<br>(según estudios de Dow Corning)<\/td>\nSilicona<\/td>\n<\/tr>\n
Resistencia a la intemperie<\/td>\nSe degrada bajo los rayos UV sin revestimiento protector<\/td>\nMantiene la elasticidad tras más de 20 años de exposición al aire libre<br>(Datos de las pruebas de envejecimiento en Miami)<\/td>\nSilicona<\/td>\n<\/tr>\n
Fuerza de adherencia<\/td>\n0,8 MPa en hormigón<br>0,5 MPa en aluminio<br>(ASTM C794)<\/td>\n0,3 MPa en hormigón<br>1,2 MPa en vidrio\/cerámica<br>(ASTM D903)<\/td>\nCorbata<\/td>\n<\/tr>\n
Resistencia al agua<\/td>\nPropenso a la hidrólisis<br>(burbujas en condiciones húmedas)<\/td>\n100% impermeable<br>Opciones de grado alimentario NSF\/ANSI 51 disponibles<\/td>\nSilicona<\/td>\n<\/tr>\n
Pintabilidad<\/td>\nSe adhiere a todos los sistemas de pintura<\/td>\nLa mayoría de las pinturas no se adhieren<br>(excepto formulaciones especiales)<\/td>\nPoliuretano<\/td>\n<\/tr>\n
Dureza Shore<\/td>\nA 15-50 (m\u00e1s suave)<\/td>\nA 20-60 (cord\u00f3n m\u00e1s firme)<\/td>\nDepende<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Consejos espec\u00edficos para cada producto:El mejor uso para cada uno<\/h2>\n

\ud83d\udebf 1. Zonas h\u00famedas \/ Duchas - \u00a1Silicona hasta el final!<\/h3>\n

Problema: Moho en las esquinas de la ducha<\/p>\n

Soluci\u00f3n: Silicona 100% con biocida (como GE Advanced Silicone 2)<\/p>\n

Consejo profesional: Corta la punta en un \u00e1ngulo de 45\u00b0 para obtener un filete c\u00f3ncavo perfecto<\/p>\n

 <\/p>\n

\ud83c\udfe2 2. Reglas de poliuretano Juntas de dilataci\u00f3n del pavimento es un poco demasiado peligroso para una ruta.<\/h3>\n

Problema: rotura de las juntas del pavimento tras un ciclo de hielo-deshielo<\/p>\n

Soluci\u00f3n: PUR autonivelante ( es decir Sikaflex SL )<\/p>\n

Consejo profesional: Es mejor utilizar primero una varilla de soporte para limitar la relaci\u00f3n profundidad-anchura.<\/p>\n

 <\/p>\n

\ud83e\ude9f 3. Instalaci\u00f3n de ventanas y puertas (m\u00e9todo h\u00edbrido)<\/h3>\n

Problema: intrusi\u00f3n de aire alrededor de ventanas y puertas<\/p>\n

Soluci\u00f3n: Silicona para vidrio-marco Poliuretano para marco-revestimiento<\/p>\n

Datos: ENERGY STAR prescribe un enfoque de doble sellado<\/p>\n

 <\/p>\n

\ud83d\ude97 4. Sellado de veh\u00edculos - Solo silicona Combinaci\u00f3n de selladores competitivos.<\/h3>\n

Problema: El aceite del motor destruye las juntasARTICULO:El exceso de aceite del motor afecta ARACI\u00d3N: Alta g Conservaci\u00f3n de las cuatro juntas rotativas.<\/p>\n

Soluci\u00f3nFabricante de juntas: Silicona RTV de alta temperatura (por ejemplo, Permatex Ultra Black)<\/p>\n

Advertencia: El poliuretano es soluble en productos derivados del petr\u00f3leo<\/p>\n

 <\/p>\n

\ud83c\udfa8 5. Superficies listas para pintar - Se requiere capa base de poliuretano.<\/h3>\n

Problema: Pintura descascarillada de juntas que estaban selladas<\/p>\n

Soluci\u00f3n:Poliuretano pintable (por ejemplo, Sonneborn NP1)<\/p>\n

Consejo profesional: Calafatear \u2192 esperar 7 d\u00edas \u2192 lijar \u2192 imprimar \u2192 pintar.<\/p>\n

 <\/p>\n

Peligros de instalaci\u00f3n que debe evitar<\/h2>\n

1. Fallos en la preparaci\u00f3n de la superficie:<\/h3>\n
    \n
  • Al pegar silicona a otro material, ambas superficies deben estar limpias, secas y sin grasa - L\u00edmpielas con alcohol isoprop\u00edlico (de frotar).<\/li>\n
  • El poliuretano debe lijarse para obtener la m\u00e1xima adherencia.<\/li>\n<\/ul>\n

    2.Condiciones de curado:<\/h3>\n

    \"\"<\/p>\n

    3. Errores en el dise\u00f1o de las juntas:<\/h3>\n

    - Anchura m\u00e1xima = 1\/2\u2033 para silicona | 4\u2033 para PU autonivelante<\/p>\n

    - 1\/2 Anchura, Profundidad (seg\u00fan ASTM C1193)<\/p>\n

     <\/p>\n

    Productos recomendados para distintas aplicaciones<\/strong><\/h2>\n\n\n\n\n\n\n\n\n\n
    Aplicaci\u00f3n<\/strong><\/td>\nLa mejor silicona<\/strong><\/td>\nEl mejor poliuretano<\/strong><\/td>\n<\/tr>\n<\/thead>\n
    Cocina\/ba\u00f1o<\/td>\nGE Silicona avanzada 2<\/td>\nN\/A<\/td>\n<\/tr>\n
    Juntas de hormig\u00f3n<\/td>\nDow Corning 790<\/td>\nSikaflex SL<\/td>\n<\/tr>\n
    Acristalamiento<\/td>\nDow Corning 995<\/td>\nN\/A<\/td>\n<\/tr>\n
    Exterior<\/td>\nN\/A<\/td>\nTremco Dymonic 100<\/td>\n<\/tr>\n
    Tapajuntas<\/td>\nGE Silicone Roof Coating<\/td>\nHenry Tropi-Cool PU<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

     <\/p>\n

    Organigrama de decisiones: Decide en 30 segundos Para muchas personas, la elecci\u00f3n se reduce a una decisi\u00f3n.<\/strong><\/h2>\n

    \"\"<\/p>\n

    El veredicto: <\/strong>La silicona es la clara vencedora en condiciones resbaladizas, agua, superficies y temperatura. El poliuretano es el rey en aplicaciones de pintura, juntas de hormig\u00f3n y zonas de alta abrasi\u00f3n. Las siliconas, con una adherencia mejorada y caracter\u00edsticas de herramienta m\u00e1s f\u00e1ciles, proporcionan una vida \u00fatil m\u00e1s larga para el 90 por ciento de los proyectos de construcci\u00f3n - y recuerde que debe adaptar su sellante a su sustrato y al entorno.Adapte siempre el sellante a su sustrato espec\u00edfico y a las condiciones ambientales.<\/p>","protected":false},"excerpt":{"rendered":"

    Este art\u00edculo compara el sellante de poliuretano con el sellante de silicona, destacando las principales diferencias en flexibilidad, durabilidad, adhesi\u00f3n y resistencia. Ayuda a los profesionales a elegir el sellante adecuado en funci\u00f3n de las necesidades de aplicaci\u00f3n en los sectores de la construcci\u00f3n, la automoci\u00f3n y la industria.<\/p>","protected":false},"author":2,"featured_media":2688,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_uag_custom_page_level_css":"","_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"default","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center 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