{"id":25033,"date":"2023-12-03T13:28:33","date_gmt":"2023-12-03T18:28:33","guid":{"rendered":"https:\/\/www.elastoproxy.com\/?p=25033"},"modified":"2023-12-08T11:20:14","modified_gmt":"2023-12-08T16:20:14","slug":"proprietes-physiques","status":"publish","type":"post","link":"https:\/\/www.elastoproxy.com\/fr\/proprietes-physiques\/","title":{"rendered":"Propri\u00e9t\u00e9s physiques"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"25033\" class=\"elementor elementor-25033\" data-elementor-post-type=\"post\">\n\t\t\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-e7e728b elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"e7e728b\" data-element_type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-08f9b7f\" data-id=\"08f9b7f\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-e67dbff elementor-widget elementor-widget-text-editor\" data-id=\"e67dbff\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Quel est le bon type de caoutchouc pour votre application d\u2019\u00e9tanch\u00e9it\u00e9 industrielle? Il des propri\u00e9t\u00e9s physiques \u00e0 consid\u00e9rer.<\/p><h2><strong>R\u00e9sistance \u00e0 la traction<\/strong><\/h2><p>Le caoutchouc s\u2019\u00e9tire, mais seulement jusqu\u2019\u00e0 un certain point. Apr\u00e8s cela, il commence \u00e0 se fracturer et \u00e0 \u00e9chouer. La r\u00e9sistance \u00e0 la traction d\u00e9crit la force n\u00e9cessaire pour s\u00e9parer un \u00e9chantillon de caoutchouc jusqu\u2019\u00e0 ce qu\u2019il se brise. Il est mesur\u00e9 en livres par pouce carr\u00e9 (psi) ou en kilopascals (kPa). Dans les applications o\u00f9 le caoutchouc est \u00e9tir\u00e9, comme les joints utilis\u00e9s avec les arbres, la r\u00e9sistance \u00e0 la traction est essentielle.<\/p><h2><strong>Duret\u00e9<\/strong><\/h2><p>La duret\u00e9 d\u00e9crit la r\u00e9sistance d\u2019un caoutchouc \u00e0 l\u2019indentation. Il existe diff\u00e9rentes fa\u00e7ons de le mesurer, y compris l\u2019\u00e9chelle Shore A. Le durom\u00e8tre est l\u2019unit\u00e9 de mesure, et les plus petits durom\u00e8tres indiquent des mat\u00e9riaux plus doux. La duret\u00e9 du caoutchouc peut \u00e9galement \u00eatre mesur\u00e9e en termes de degr\u00e9 international de duret\u00e9 du caoutchouc (IRHD) sur une \u00e9chelle de 0 (le plus doux) \u00e0 100 (le plus dur). Notez que chaque type de compos\u00e9 est disponible dans une gamme de duret\u00e9s.\u00a0\u00a0\u00a0<\/p><h2><strong>Gravit\u00e9 sp\u00e9cifique<\/strong><\/h2><p>La densit\u00e9 est le rapport entre le poids d\u2019un mat\u00e9riau et le poids d\u2019un volume \u00e9gal d\u2019eau \u00e0 une temp\u00e9rature sp\u00e9cifi\u00e9e. C\u2019est un nombre sans dimension, mais le caoutchouc avec une densit\u00e9 plus \u00e9lev\u00e9e est plus lourd. C\u2019est une consid\u00e9ration importante avec des applications telles que l\u2019all\u00e8gement du v\u00e9hicule, ou si vous avez besoin d\u2019un joint pour r\u00e9sister \u00e0 une lourde charge.\u00a0<\/p><h2><strong>R\u00e9sistance \u00e0 la d\u00e9chirure<\/strong><\/h2><p>La r\u00e9sistance \u00e0 la d\u00e9chirure d\u00e9crit la r\u00e9sistance d\u2019un caoutchouc \u00e0 la croissance d\u2019une entaille ou d\u2019une coupe sous tension. Cette propri\u00e9t\u00e9 physique comprend la force requise pour initier une d\u00e9chirure et la force requise pour la propager. Si votre joint entre en contact avec des bords m\u00e9talliques rugueux ou des objets tranchants, la r\u00e9sistance \u00e0 la d\u00e9chirure est particuli\u00e8rement importante. Les exemples incluent les garnitures de bord utilis\u00e9es avec les tables de travail en acier inoxydable.\u00a0<\/p><h2><strong>R\u00e9sistance \u00e0 l\u2019abrasion<\/strong><\/h2><p>La r\u00e9sistance \u00e0 l\u2019abrasion d\u00e9crit la r\u00e9sistance d\u2019un caoutchouc au frottement ou au raclage. C\u2019est une propri\u00e9t\u00e9 importante car si trop de caoutchouc est enlev\u00e9, un joint peut commencer \u00e0 fuir. Le caoutchouc avec une r\u00e9sistance \u00e9lev\u00e9e \u00e0 l\u2019abrasion est n\u00e9cessaire pour les joints de pompe qui manipulent les boues, les m\u00e9langes de solides plus denses en suspension dans des liquides. Pourtant, m\u00eame les joints de porte n\u00e9cessitent une r\u00e9sistance \u00e0 l\u2019abrasion suffisante pour \u00e9viter l\u2019usure.\u00a0<\/p><h2><strong>Rebond (froid et chaud)<\/strong><\/h2><p>Le rebond ou la r\u00e9silience fait r\u00e9f\u00e9rence \u00e0 la capacit\u00e9 d\u2019un caoutchouc \u00e0 retrouver sa taille et sa forme d\u2019origine apr\u00e8s sa d\u00e9formation temporaire. Cette propri\u00e9t\u00e9 physique est particuli\u00e8rement importante dans les joints dynamiques o\u00f9 vous avez besoin d\u2019une barri\u00e8re entre une surface en mouvement et une surface stationnaire. Par exemple, un joint de porte est temporairement d\u00e9form\u00e9 lorsqu&rsquo;une porte (la surface mobile) est ferm\u00e9e et d\u00e9forme un joint attach\u00e9 \u00e0 un cadre de porte stationnaire.<\/p><h2><strong>Jeu de compression<\/strong><\/h2><p>L\u2019ensemble de compression fait r\u00e9f\u00e9rence \u00e0 la d\u00e9formation permanente qui se produit lorsqu\u2019un mat\u00e9riau est comprim\u00e9 sous une charge sp\u00e9cifique pendant un temps sp\u00e9cifique et \u00e0 une temp\u00e9rature sp\u00e9cifique. Avec le caoutchouc EPDM, par exemple, un ensemble de compression de 22 heures \u00e0 125\u00b0 C donne un ensemble de compression de 25%. Par rapport \u00e0 d\u2019autres \u00e9lastom\u00e8res couramment utilis\u00e9s, cela est consid\u00e9r\u00e9 comme juste plut\u00f4t que bon.<\/p><h2><strong>Perm\u00e9abilit\u00e9 aux gaz<\/strong><\/h2><p>La perm\u00e9abilit\u00e9 des gaz d\u00e9crit la vitesse \u00e0 laquelle les mol\u00e9cules de gaz telles que l\u2019air traversent un compos\u00e9 de caoutchouc. La plupart du caoutchouc a une faible perm\u00e9abilit\u00e9 aux gaz, mais certaines applications n\u00e9cessitent des performances exceptionnelles. Les exemples incluent les joints de carburant sur les v\u00e9hicules \u00e0 faibles \u00e9missions et les joints m\u00e9dicaux qui sont soumis \u00e0 l\u2019autoclavage, un processus de st\u00e9rilisation qui utilise une chaleur et une pression \u00e9lev\u00e9es.\u00a0<\/p><h2><strong>Absorption d\u2019eau<\/strong><\/h2><p>L\u2019absorption d\u2019eau fait r\u00e9f\u00e9rence \u00e0 la capacit\u00e9 d\u2019un caoutchouc \u00e0 absorber l\u2019eau de son environnement. Parce que le caoutchouc est poreux, une certaine quantit\u00e9 d\u2019absorption d\u2019eau est normale. Les compos\u00e9s o\u00f9 l\u2019absorption d\u2019eau est d\u00e9crite comme tr\u00e8s bonne ou excellente absorbent tr\u00e8s peu d\u2019eau, une consid\u00e9ration importante pour l\u2019\u00e9tanch\u00e9it\u00e9 environnementale. C\u2019est l\u2019une des raisons pour lesquelles l\u2019EPDM est souvent utilis\u00e9 dans les joints m\u00e9t\u00e9orologiques.\u00a0<\/p><h2><strong>Oxydation <\/strong><\/h2><p>L\u2019oxydation ajoute de l\u2019oxyg\u00e8ne \u00e0 une substance. Avec le caoutchouc, c\u2019est un probl\u00e8me parce que l\u2019oxyg\u00e8ne ajout\u00e9 r\u00e9agit avec et \u00e9limine le soufre qui a \u00e9t\u00e9 utilis\u00e9 dans la vulcanisation pour construire des cha\u00eenes mol\u00e9culaires. Sans ce soufre, le caoutchouc devient plus faible et moins \u00e9lastique. Les mat\u00e9riaux en caoutchouc avec une oxydation tr\u00e8s bonne ou excellente sont moins susceptibles de rencontrer ces probl\u00e8mes.\u00a0\u00a0\u00a0<\/p><h2><strong>L\u2019ozone<\/strong><\/h2><p>L\u2019ozone est un gaz incolore aux puissantes propri\u00e9t\u00e9s oxydantes. Il est produit \u00e0 partir de l\u2019oxyg\u00e8ne soit par des d\u00e9charges \u00e9lectriques ou ultraviolet (UV) lumi\u00e8re. Avec le caoutchouc, l\u2019ozone rompt les liaisons mol\u00e9culaires et peut provoquer une forme de fissuration appel\u00e9e pourriture s\u00e8che. Le caoutchouc avec une tr\u00e8s bonne ou une excellente r\u00e9sistance \u00e0 l\u2019ozone est recommand\u00e9 pour les joints ext\u00e9rieurs expos\u00e9s \u00e0 la lumi\u00e8re du soleil, une forme de lumi\u00e8re UV et les \u00e9quipements \u00e9lectriques tels que les moteurs.\u00a0\u00a0\u00a0<\/p><h2><strong>Vieillissement de la lumi\u00e8re du soleil<\/strong><\/h2><p>L\u2019\u00e2ge de la lumi\u00e8re du soleil d\u00e9truit les liaisons mol\u00e9culaires du caoutchouc et provoque une perte de r\u00e9sistance, d\u2019\u00e9lasticit\u00e9 et de flexibilit\u00e9. \u00c0 mesure que ces dommages augmentent au fil du temps, ils peuvent entra\u00eener une d\u00e9faillance du joint. Le vieillissement de la lumi\u00e8re du soleil d\u00e9crit \u00e0 quel point un caoutchouc r\u00e9siste aux rayons UV du soleil. Un mauvais vieillissement de la lumi\u00e8re du soleil peut \u00eatre acceptable pour les applications int\u00e9rieures, mais les joints qui sont utilis\u00e9s \u00e0 l\u2019ext\u00e9rieur doivent r\u00e9sister \u00e0 la photod\u00e9gradation.\u00a0<\/p><h2><strong>Trouvez les propri\u00e9t\u00e9s physiques des mat\u00e9riaux en caoutchouc<\/strong><\/h2><p>Pour plus d\u2019informations sur la s\u00e9lection du bon caoutchouc pour les joints industriels, <a href=\"https:\/\/www.elastoproxy.com\/fr\/contact\/\">contactez Elasto Proxy<\/a>.\u00a0<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>Pour obtenir le bon caoutchouc, vous devez savoir ce qui est disponible et comment ces diff\u00e9rents compos\u00e9s, comme on les appelle, se comparent en termes de propri\u00e9t\u00e9s physiques. 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