{"id":892,"date":"2019-01-08T10:06:11","date_gmt":"2019-01-08T09:06:11","guid":{"rendered":"http:\/\/technologie-sciarretta.ovh\/?p=892"},"modified":"2020-09-23T10:37:12","modified_gmt":"2020-09-23T08:37:12","slug":"les-plastiques","status":"publish","type":"post","link":"https:\/\/technologie-sciarretta.ovh\/?p=892","title":{"rendered":"Les plastiques"},"content":{"rendered":"<p>Les plastiques\u00a0sont des mati\u00e8res obtenues par transformations chimiques de produits souvent d\u00e9riv\u00e9s du p\u00e9trole.<\/p>\n<p>Il existe diff\u00e9rents types de mati\u00e8res plastiques :<\/p>\n<p>&nbsp;<\/p>\n<ul>\n<li><strong>Les thermodurcissables<\/strong> : Ils prennent leur forme d\u00e9finitive au 1er refroidissement, il n&#8217;est plus possible de les fa\u00e7onner par la suite m\u00eame sous l&#8217;effet de la chaleur.<br \/>\nExemples : Bakelite, araldite, formica, polyester, etc.<\/li>\n<\/ul>\n<p><a href=\"https:\/\/i0.wp.com\/technologie-sciarretta.ovh\/wp-content\/uploads\/2019\/01\/polyester.jpg\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" data-attachment-id=\"890\" data-permalink=\"https:\/\/technologie-sciarretta.ovh\/?attachment_id=890\" data-orig-file=\"https:\/\/i0.wp.com\/technologie-sciarretta.ovh\/wp-content\/uploads\/2019\/01\/polyester.jpg?fit=300%2C300&amp;ssl=1\" data-orig-size=\"300,300\" data-comments-opened=\"0\" data-image-meta=\"{&quot;aperture&quot;:&quot;0&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;0&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;0&quot;,&quot;iso&quot;:&quot;0&quot;,&quot;shutter_speed&quot;:&quot;0&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;0&quot;}\" data-image-title=\"polyester\" data-image-description=\"\" data-image-caption=\"\" data-medium-file=\"https:\/\/i0.wp.com\/technologie-sciarretta.ovh\/wp-content\/uploads\/2019\/01\/polyester.jpg?fit=300%2C300&amp;ssl=1\" data-large-file=\"https:\/\/i0.wp.com\/technologie-sciarretta.ovh\/wp-content\/uploads\/2019\/01\/polyester.jpg?fit=300%2C300&amp;ssl=1\" class=\"alignnone wp-image-890 size-full\" src=\"https:\/\/i0.wp.com\/technologie-sciarretta.ovh\/wp-content\/uploads\/2019\/01\/polyester.jpg?resize=300%2C300\" alt=\"plastiques polyester\" width=\"300\" height=\"300\" srcset=\"https:\/\/i0.wp.com\/technologie-sciarretta.ovh\/wp-content\/uploads\/2019\/01\/polyester.jpg?w=300&amp;ssl=1 300w, https:\/\/i0.wp.com\/technologie-sciarretta.ovh\/wp-content\/uploads\/2019\/01\/polyester.jpg?resize=150%2C150&amp;ssl=1 150w, https:\/\/i0.wp.com\/technologie-sciarretta.ovh\/wp-content\/uploads\/2019\/01\/polyester.jpg?resize=24%2C24&amp;ssl=1 24w, https:\/\/i0.wp.com\/technologie-sciarretta.ovh\/wp-content\/uploads\/2019\/01\/polyester.jpg?resize=36%2C36&amp;ssl=1 36w, https:\/\/i0.wp.com\/technologie-sciarretta.ovh\/wp-content\/uploads\/2019\/01\/polyester.jpg?resize=48%2C48&amp;ssl=1 48w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><\/p>\n<p>Le fil de polyester permet la fabrication de v\u00eatements.<\/p>\n<p>&nbsp;<\/p>\n<ul>\n<li><strong>Les thermoplastiques<\/strong> : Les thermoplastiques se d\u00e9forment et se fa\u00e7onnent sous l&#8217;effet de la chaleur.<br \/>\nExemples : PVC, Plexiglas, Polystyr\u00e8ne, PET, etc.<\/li>\n<\/ul>\n<p><a href=\"https:\/\/i0.wp.com\/technologie-sciarretta.ovh\/wp-content\/uploads\/2019\/01\/pvc.jpg\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" data-attachment-id=\"891\" data-permalink=\"https:\/\/technologie-sciarretta.ovh\/?attachment_id=891\" data-orig-file=\"https:\/\/i0.wp.com\/technologie-sciarretta.ovh\/wp-content\/uploads\/2019\/01\/pvc.jpg?fit=1500%2C1500&amp;ssl=1\" data-orig-size=\"1500,1500\" data-comments-opened=\"0\" data-image-meta=\"{&quot;aperture&quot;:&quot;0&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;0&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;0&quot;,&quot;iso&quot;:&quot;0&quot;,&quot;shutter_speed&quot;:&quot;0&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;0&quot;}\" data-image-title=\"pvc\" data-image-description=\"\" data-image-caption=\"\" data-medium-file=\"https:\/\/i0.wp.com\/technologie-sciarretta.ovh\/wp-content\/uploads\/2019\/01\/pvc.jpg?fit=300%2C300&amp;ssl=1\" data-large-file=\"https:\/\/i0.wp.com\/technologie-sciarretta.ovh\/wp-content\/uploads\/2019\/01\/pvc.jpg?fit=700%2C700&amp;ssl=1\" class=\"alignnone wp-image-891\" src=\"https:\/\/i0.wp.com\/technologie-sciarretta.ovh\/wp-content\/uploads\/2019\/01\/pvc.jpg?resize=264%2C264\" alt=\"plastiques pvc\" width=\"264\" height=\"264\" srcset=\"https:\/\/i0.wp.com\/technologie-sciarretta.ovh\/wp-content\/uploads\/2019\/01\/pvc.jpg?resize=1024%2C1024&amp;ssl=1 1024w, https:\/\/i0.wp.com\/technologie-sciarretta.ovh\/wp-content\/uploads\/2019\/01\/pvc.jpg?resize=150%2C150&amp;ssl=1 150w, https:\/\/i0.wp.com\/technologie-sciarretta.ovh\/wp-content\/uploads\/2019\/01\/pvc.jpg?resize=300%2C300&amp;ssl=1 300w, https:\/\/i0.wp.com\/technologie-sciarretta.ovh\/wp-content\/uploads\/2019\/01\/pvc.jpg?resize=768%2C768&amp;ssl=1 768w, https:\/\/i0.wp.com\/technologie-sciarretta.ovh\/wp-content\/uploads\/2019\/01\/pvc.jpg?resize=24%2C24&amp;ssl=1 24w, https:\/\/i0.wp.com\/technologie-sciarretta.ovh\/wp-content\/uploads\/2019\/01\/pvc.jpg?resize=36%2C36&amp;ssl=1 36w, https:\/\/i0.wp.com\/technologie-sciarretta.ovh\/wp-content\/uploads\/2019\/01\/pvc.jpg?resize=48%2C48&amp;ssl=1 48w, https:\/\/i0.wp.com\/technologie-sciarretta.ovh\/wp-content\/uploads\/2019\/01\/pvc.jpg?w=1500&amp;ssl=1 1500w, https:\/\/i0.wp.com\/technologie-sciarretta.ovh\/wp-content\/uploads\/2019\/01\/pvc.jpg?w=1400 1400w\" sizes=\"auto, (max-width: 264px) 100vw, 264px\" \/><\/a><a href=\"https:\/\/i0.wp.com\/technologie-sciarretta.ovh\/wp-content\/uploads\/2019\/01\/les-plastiques.jpg\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" data-attachment-id=\"889\" data-permalink=\"https:\/\/technologie-sciarretta.ovh\/?attachment_id=889\" data-orig-file=\"https:\/\/i0.wp.com\/technologie-sciarretta.ovh\/wp-content\/uploads\/2019\/01\/les-plastiques.jpg?fit=960%2C638&amp;ssl=1\" data-orig-size=\"960,638\" data-comments-opened=\"0\" data-image-meta=\"{&quot;aperture&quot;:&quot;0&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;0&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;0&quot;,&quot;iso&quot;:&quot;0&quot;,&quot;shutter_speed&quot;:&quot;0&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;0&quot;}\" data-image-title=\"les plastiques\" data-image-description=\"\" data-image-caption=\"\" data-medium-file=\"https:\/\/i0.wp.com\/technologie-sciarretta.ovh\/wp-content\/uploads\/2019\/01\/les-plastiques.jpg?fit=300%2C199&amp;ssl=1\" data-large-file=\"https:\/\/i0.wp.com\/technologie-sciarretta.ovh\/wp-content\/uploads\/2019\/01\/les-plastiques.jpg?fit=700%2C465&amp;ssl=1\" class=\"alignnone wp-image-889\" src=\"https:\/\/i0.wp.com\/technologie-sciarretta.ovh\/wp-content\/uploads\/2019\/01\/les-plastiques.jpg?resize=347%2C231\" alt=\"plastiques\" width=\"347\" height=\"231\" srcset=\"https:\/\/i0.wp.com\/technologie-sciarretta.ovh\/wp-content\/uploads\/2019\/01\/les-plastiques.jpg?w=960&amp;ssl=1 960w, https:\/\/i0.wp.com\/technologie-sciarretta.ovh\/wp-content\/uploads\/2019\/01\/les-plastiques.jpg?resize=300%2C199&amp;ssl=1 300w, https:\/\/i0.wp.com\/technologie-sciarretta.ovh\/wp-content\/uploads\/2019\/01\/les-plastiques.jpg?resize=768%2C510&amp;ssl=1 768w, https:\/\/i0.wp.com\/technologie-sciarretta.ovh\/wp-content\/uploads\/2019\/01\/les-plastiques.jpg?resize=90%2C60&amp;ssl=1 90w, https:\/\/i0.wp.com\/technologie-sciarretta.ovh\/wp-content\/uploads\/2019\/01\/les-plastiques.jpg?resize=24%2C16&amp;ssl=1 24w, https:\/\/i0.wp.com\/technologie-sciarretta.ovh\/wp-content\/uploads\/2019\/01\/les-plastiques.jpg?resize=36%2C24&amp;ssl=1 36w, https:\/\/i0.wp.com\/technologie-sciarretta.ovh\/wp-content\/uploads\/2019\/01\/les-plastiques.jpg?resize=48%2C32&amp;ssl=1 48w, https:\/\/i0.wp.com\/technologie-sciarretta.ovh\/wp-content\/uploads\/2019\/01\/les-plastiques.jpg?resize=272%2C182&amp;ssl=1 272w\" sizes=\"auto, (max-width: 347px) 100vw, 347px\" \/><\/a><\/p>\n<p>&nbsp;<\/p>\n<ul>\n<li><strong>Les \u00e9lastom\u00e8res<\/strong> : Ils pr\u00e9sentent les m\u00eames qualit\u00e9s \u00e9lastiques que le caoutchouc (qui est un \u00e9lastom\u00e8re naturel).<\/li>\n<\/ul>\n<p><a href=\"https:\/\/i0.wp.com\/technologie-sciarretta.ovh\/wp-content\/uploads\/2019\/01\/elastomeres.jpg\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" data-attachment-id=\"888\" data-permalink=\"https:\/\/technologie-sciarretta.ovh\/?attachment_id=888\" data-orig-file=\"https:\/\/i0.wp.com\/technologie-sciarretta.ovh\/wp-content\/uploads\/2019\/01\/elastomeres.jpg?fit=535%2C413&amp;ssl=1\" data-orig-size=\"535,413\" data-comments-opened=\"0\" data-image-meta=\"{&quot;aperture&quot;:&quot;0&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;0&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;0&quot;,&quot;iso&quot;:&quot;0&quot;,&quot;shutter_speed&quot;:&quot;0&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;0&quot;}\" data-image-title=\"elastomeres\" data-image-description=\"\" data-image-caption=\"\" data-medium-file=\"https:\/\/i0.wp.com\/technologie-sciarretta.ovh\/wp-content\/uploads\/2019\/01\/elastomeres.jpg?fit=300%2C232&amp;ssl=1\" data-large-file=\"https:\/\/i0.wp.com\/technologie-sciarretta.ovh\/wp-content\/uploads\/2019\/01\/elastomeres.jpg?fit=535%2C413&amp;ssl=1\" class=\"alignnone wp-image-888\" src=\"https:\/\/i0.wp.com\/technologie-sciarretta.ovh\/wp-content\/uploads\/2019\/01\/elastomeres.jpg?resize=269%2C208\" alt=\"plastiques \u00e9lastom\u00e8re\" width=\"269\" height=\"208\" srcset=\"https:\/\/i0.wp.com\/technologie-sciarretta.ovh\/wp-content\/uploads\/2019\/01\/elastomeres.jpg?w=535&amp;ssl=1 535w, https:\/\/i0.wp.com\/technologie-sciarretta.ovh\/wp-content\/uploads\/2019\/01\/elastomeres.jpg?resize=300%2C232&amp;ssl=1 300w, https:\/\/i0.wp.com\/technologie-sciarretta.ovh\/wp-content\/uploads\/2019\/01\/elastomeres.jpg?resize=24%2C19&amp;ssl=1 24w, https:\/\/i0.wp.com\/technologie-sciarretta.ovh\/wp-content\/uploads\/2019\/01\/elastomeres.jpg?resize=36%2C28&amp;ssl=1 36w, https:\/\/i0.wp.com\/technologie-sciarretta.ovh\/wp-content\/uploads\/2019\/01\/elastomeres.jpg?resize=48%2C37&amp;ssl=1 48w\" sizes=\"auto, (max-width: 269px) 100vw, 269px\" \/><\/a><\/p>\n<p>&nbsp;<\/p>\n<p>On retrouve les plastiques dans tous les secteurs d&#8217;activit\u00e9s. L&#8217;augmentation de la production est telle qu&#8217;ils sont devenus les mat\u00e9riaux les plus utilis\u00e9s.<\/p>\n<p><a href=\"https:\/\/i0.wp.com\/technologie-sciarretta.ovh\/wp-content\/uploads\/2019\/01\/repartition-plastique.png\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" data-attachment-id=\"895\" data-permalink=\"https:\/\/technologie-sciarretta.ovh\/?attachment_id=895\" data-orig-file=\"https:\/\/i0.wp.com\/technologie-sciarretta.ovh\/wp-content\/uploads\/2019\/01\/repartition-plastique.png?fit=440%2C291&amp;ssl=1\" data-orig-size=\"440,291\" data-comments-opened=\"0\" data-image-meta=\"{&quot;aperture&quot;:&quot;0&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;0&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;0&quot;,&quot;iso&quot;:&quot;0&quot;,&quot;shutter_speed&quot;:&quot;0&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;0&quot;}\" data-image-title=\"repartition plastique\" data-image-description=\"\" data-image-caption=\"\" data-medium-file=\"https:\/\/i0.wp.com\/technologie-sciarretta.ovh\/wp-content\/uploads\/2019\/01\/repartition-plastique.png?fit=300%2C198&amp;ssl=1\" data-large-file=\"https:\/\/i0.wp.com\/technologie-sciarretta.ovh\/wp-content\/uploads\/2019\/01\/repartition-plastique.png?fit=440%2C291&amp;ssl=1\" class=\"alignnone wp-image-895\" src=\"https:\/\/i0.wp.com\/technologie-sciarretta.ovh\/wp-content\/uploads\/2019\/01\/repartition-plastique.png?resize=328%2C217\" alt=\"production plastique\" width=\"328\" height=\"217\" srcset=\"https:\/\/i0.wp.com\/technologie-sciarretta.ovh\/wp-content\/uploads\/2019\/01\/repartition-plastique.png?w=440&amp;ssl=1 440w, https:\/\/i0.wp.com\/technologie-sciarretta.ovh\/wp-content\/uploads\/2019\/01\/repartition-plastique.png?resize=300%2C198&amp;ssl=1 300w, https:\/\/i0.wp.com\/technologie-sciarretta.ovh\/wp-content\/uploads\/2019\/01\/repartition-plastique.png?resize=90%2C60&amp;ssl=1 90w, https:\/\/i0.wp.com\/technologie-sciarretta.ovh\/wp-content\/uploads\/2019\/01\/repartition-plastique.png?resize=24%2C16&amp;ssl=1 24w, https:\/\/i0.wp.com\/technologie-sciarretta.ovh\/wp-content\/uploads\/2019\/01\/repartition-plastique.png?resize=36%2C24&amp;ssl=1 36w, https:\/\/i0.wp.com\/technologie-sciarretta.ovh\/wp-content\/uploads\/2019\/01\/repartition-plastique.png?resize=48%2C32&amp;ssl=1 48w\" sizes=\"auto, (max-width: 328px) 100vw, 328px\" \/><\/a> <a href=\"https:\/\/i0.wp.com\/technologie-sciarretta.ovh\/wp-content\/uploads\/2019\/01\/Production_de_plastiques.png\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" data-attachment-id=\"894\" data-permalink=\"https:\/\/technologie-sciarretta.ovh\/?attachment_id=894\" data-orig-file=\"https:\/\/i0.wp.com\/technologie-sciarretta.ovh\/wp-content\/uploads\/2019\/01\/Production_de_plastiques.png?fit=440%2C396&amp;ssl=1\" data-orig-size=\"440,396\" data-comments-opened=\"0\" data-image-meta=\"{&quot;aperture&quot;:&quot;0&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;0&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;0&quot;,&quot;iso&quot;:&quot;0&quot;,&quot;shutter_speed&quot;:&quot;0&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;0&quot;}\" data-image-title=\"Production_de_plastiques\" data-image-description=\"\" data-image-caption=\"\" data-medium-file=\"https:\/\/i0.wp.com\/technologie-sciarretta.ovh\/wp-content\/uploads\/2019\/01\/Production_de_plastiques.png?fit=300%2C270&amp;ssl=1\" data-large-file=\"https:\/\/i0.wp.com\/technologie-sciarretta.ovh\/wp-content\/uploads\/2019\/01\/Production_de_plastiques.png?fit=440%2C396&amp;ssl=1\" class=\"alignnone wp-image-894\" src=\"https:\/\/i0.wp.com\/technologie-sciarretta.ovh\/wp-content\/uploads\/2019\/01\/Production_de_plastiques.png?resize=344%2C310\" alt=\"production plastique\" width=\"344\" height=\"310\" srcset=\"https:\/\/i0.wp.com\/technologie-sciarretta.ovh\/wp-content\/uploads\/2019\/01\/Production_de_plastiques.png?w=440&amp;ssl=1 440w, https:\/\/i0.wp.com\/technologie-sciarretta.ovh\/wp-content\/uploads\/2019\/01\/Production_de_plastiques.png?resize=300%2C270&amp;ssl=1 300w, https:\/\/i0.wp.com\/technologie-sciarretta.ovh\/wp-content\/uploads\/2019\/01\/Production_de_plastiques.png?resize=24%2C22&amp;ssl=1 24w, https:\/\/i0.wp.com\/technologie-sciarretta.ovh\/wp-content\/uploads\/2019\/01\/Production_de_plastiques.png?resize=36%2C32&amp;ssl=1 36w, https:\/\/i0.wp.com\/technologie-sciarretta.ovh\/wp-content\/uploads\/2019\/01\/Production_de_plastiques.png?resize=48%2C43&amp;ssl=1 48w\" sizes=\"auto, (max-width: 344px) 100vw, 344px\" \/><\/a><\/p>\n<p>Pour aller plus loin, <a href=\"https:\/\/fr.wikipedia.org\/wiki\/Mati%C3%A8re_plastique\" target=\"_blank\" rel=\"noopener noreferrer\">le sujet vu par wikip\u00e9dia.<\/a><\/p>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Les plastiques\u00a0sont des mati\u00e8res obtenues par transformations chimiques de produits souvent d\u00e9riv\u00e9s du p\u00e9trole. Il existe diff\u00e9rents types de mati\u00e8res plastiques : &nbsp; Les thermodurcissables : Ils prennent leur forme d\u00e9finitive au 1er refroidissement, il n&#8217;est plus possible de les fa\u00e7onner par la suite m\u00eame sous l&#8217;effet de la chaleur. Exemples : Bakelite, araldite, formica, [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":889,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[45,20],"tags":[30],"class_list":["post-892","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-materiaux","category-ressources","tag-materiaux"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.2 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Les plastiques - LA TECHNOLOGIE<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"http:\/\/technologie-sciarretta.ovh\/?p=892\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Les plastiques - LA TECHNOLOGIE\" \/>\n<meta property=\"og:description\" content=\"Les plastiques\u00a0sont des mati\u00e8res obtenues par transformations chimiques de produits souvent d\u00e9riv\u00e9s du p\u00e9trole. Il existe diff\u00e9rents types de mati\u00e8res plastiques : &nbsp; Les thermodurcissables : Ils prennent leur forme d\u00e9finitive au 1er refroidissement, il n&#8217;est plus possible de les fa\u00e7onner par la suite m\u00eame sous l&#8217;effet de la chaleur. 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