{"id":4179,"date":"2025-10-21T07:31:35","date_gmt":"2025-10-21T07:31:35","guid":{"rendered":"https:\/\/donyanchem.com\/?p=4179"},"modified":"2025-10-31T03:01:33","modified_gmt":"2025-10-31T03:01:33","slug":"why-is-pu-foam-sealant-shrinking-after-drying","status":"publish","type":"post","link":"https:\/\/donyanchem.com\/fr\/why-is-pu-foam-sealant-shrinking-after-drying\/","title":{"rendered":"Pourquoi le mastic en mousse PU r\u00e9tr\u00e9cit-il apr\u00e8s s\u00e9chage ?"},"content":{"rendered":"<p><strong><a href=\"https:\/\/donyanchem.com\/fr\/product-category\/polyurethane-foam\/\">Mastic en mousse PU (polyur\u00e9thane)<\/a><\/strong> est un incontournable dans les projets de construction et de bricolage, r\u00e9put\u00e9 pour ses capacit\u00e9s exceptionnelles d&#039;\u00e9tanch\u00e9it\u00e9, d&#039;isolation et de comblement des espaces.<\/p>\n\n\n\n<p>Cependant, les utilisateurs sont parfois alarm\u00e9s par un retrait notable ou un d\u00e9collement des surfaces apr\u00e8s durcissement complet de la mousse. Ce ph\u00e9nom\u00e8ne peut compromettre l&#039;\u00e9tanch\u00e9it\u00e9, r\u00e9duire la valeur isolante et entra\u00eener des courants d&#039;air ou des infiltrations d&#039;humidit\u00e9. Comprendre les causes de ce retrait est essentiel pour obtenir des r\u00e9sultats professionnels et durables. Cet article examine les causes scientifiques et pratiques du retrait des mastics en mousse PU, en se concentrant plus particuli\u00e8rement sur le r\u00f4le de sa structure \u00e0 cellules ferm\u00e9es et sur les processus chimiques en jeu.<\/p>\n\n\n\n<div class=\"wp-block-uagb-advanced-heading uagb-block-3b66b4a2\"><h2 class=\"uagb-heading-text\"><strong>La nature fondamentale de la mousse PU\u00a0: une structure \u00e0 cellules ferm\u00e9es<\/strong><\/h2><\/div>\n\n\n\n<p>Pour comprendre l&#039;origine du retrait, il est essentiel de comprendre l&#039;anatomie de base de la mousse PU durcie. La plupart des mastics expansifs sont con\u00e7us pour former une structure en mousse PU \u00e0 cellules ferm\u00e9es. <\/p>\n\n\n\n<div class=\"wp-block-uagb-advanced-heading uagb-block-7c021a98\"><h2 class=\"uagb-heading-text\"><strong>Qu&#039;est-ce que <a href=\"https:\/\/www.americanchemistry.com\/chemistry-in-america\/chemistry-in-polyurethanes\" target=\"_blank\" rel=\"noopener\">Mousse de polyur\u00e9thane \u00e0 cellules ferm\u00e9es<\/a>?<\/strong> <\/h2><\/div>\n\n\n\n<p>Dans une mousse \u00e0 cellules ferm\u00e9es, les bulles de gaz (cellules) form\u00e9es lors de l&#039;expansion sont enti\u00e8rement enferm\u00e9es par les parois en polym\u00e8re de polyur\u00e9thane. Ces cellules individuelles sont isol\u00e9es les unes des autres, cr\u00e9ant une matrice de minuscules compartiments remplis de gaz. Cette structure est \u00e0 l&#039;origine des principaux avantages de la mousse\u00a0: <\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Valeur R \u00e9lev\u00e9e (isolation) : le gaz emprisonn\u00e9, souvent un agent gonflant \u00e0 faible conductivit\u00e9, est un mauvais conducteur de chaleur, offrant une excellente isolation thermique.<\/li>\n\n\n\n<li>Barri\u00e8re contre l\u2019humidit\u00e9 et la vapeur : La paroi polym\u00e8re continue agit comme une barri\u00e8re contre les infiltrations d\u2019eau et d\u2019air.<\/li>\n\n\n\n<li>Rigidit\u00e9 structurelle : Les parois cellulaires contribuent \u00e0 la r\u00e9sistance de la mousse et \u00e0 sa capacit\u00e9 \u00e0 r\u00e9sister \u00e0 la compression.<\/li>\n<\/ul>\n\n\n\n<p>Cependant, cette structure m\u00eame est \u00e9galement au c\u0153ur du risque de retrait des mousses d&#039;\u00e9tanch\u00e9it\u00e9 PU. L&#039;int\u00e9grit\u00e9 et la pression interne de ces cellules ne sont pas statiques et peuvent \u00e9voluer avec le temps, entra\u00eenant une instabilit\u00e9 dimensionnelle. <\/p>\n\n\n\n<p>Pour une explication technique d\u00e9taill\u00e9e de la chimie de la mousse de polyur\u00e9thane et de la structure cellulaire, la division polyur\u00e9thane de l&#039;American Chemical Council fournit d&#039;excellentes ressources. <\/p>\n\n\n\n<div class=\"wp-block-uagb-image uagb-block-9791eaee wp-block-uagb-image--layout-default wp-block-uagb-image--effect-static wp-block-uagb-image--align-none\"><figure class=\"wp-block-uagb-image__figure\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" srcset=\"https:\/\/donyanchem.com\/wp-content\/uploads\/2025\/09\/glo-construction-foams10_16-9-1024x576.webp ,https:\/\/donyanchem.com\/wp-content\/uploads\/2025\/09\/glo-construction-foams10_16-9.webp 780w, https:\/\/donyanchem.com\/wp-content\/uploads\/2025\/09\/glo-construction-foams10_16-9.webp 360w\" sizes=\"auto, (max-width: 480px) 150px\" src=\"https:\/\/i0.wp.com\/donyanchem.com\/wp-content\/uploads\/2025\/09\/glo-construction-foams10_16-9.webp?resize=1024%2C576&#038;ssl=1\" alt=\"Mastic en mousse PU Donyan pour le b\u00e2timent \" class=\"uag-image-4127\" width=\"1024\" height=\"576\" title=\"Mousse PU Donyan pour la construction\" role=\"img\"\/><\/figure><\/div>\n\n\n\n<p><\/p>\n\n\n\n<div class=\"wp-block-uagb-advanced-heading uagb-block-172140fd\"><h3 class=\"uagb-heading-text\"><strong>Les principaux coupables : d\u00e9m\u00ealer les causes de <a href=\"https:\/\/www.polyurethane.org\/\" target=\"_blank\" rel=\"noopener\">Mousse PU<\/a> R\u00e9tr\u00e9cissement du mastic<\/strong><\/h3><\/div>\n\n\n\n<p>Le r\u00e9tr\u00e9cissement n&#039;est pas un probl\u00e8me isol\u00e9, mais plut\u00f4t le r\u00e9sultat d&#039;une combinaison de facteurs chimiques et physiques. Les causes les plus importantes sont li\u00e9es aux gaz emprisonn\u00e9s dans la structure de la mousse PU \u00e0 cellules ferm\u00e9es.<\/p>\n\n\n\n<p><strong>1. Diffusion des gaz et \u00e9quilibre thermique (la cause la plus courante)<\/strong> <\/p>\n\n\n\n<p>Il s\u2019agit de la principale raison scientifique d\u2019un r\u00e9tr\u00e9cissement normal et minimal et elle peut expliquer les cas les plus graves.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Processus de durcissement\u00a0: Lorsque la mousse est expuls\u00e9e de l\u2019a\u00e9rosol, elle est \u00e0 l\u2019\u00e9tat liquide. Un propulseur (dans l\u2019a\u00e9rosol) et un agent gonflant chimique (qui r\u00e9agit pour produire du gaz) provoquent son expansion rapide. Le gaz principal qui remplit les cellules \u00e0 ce stade est souvent un m\u00e9lange de CO\u2082 (issu de la r\u00e9action entre l\u2019isocyanate et l\u2019eau) et potentiellement d\u2019autres agents gonflants \u00e0 faible conductivit\u00e9 thermique.<\/li>\n\n\n\n<li>La \u201c\u00a0respiration\u00a0\u201d de la mousse\u00a0: Une fois la mousse expans\u00e9e et la peau form\u00e9e, les gaz internes commencent \u00e0 se stabiliser avec l\u2019environnement ext\u00e9rieur. Le CO\u2082 est tr\u00e8s soluble et se diffuse relativement rapidement hors des cellules de la mousse. Simultan\u00e9ment, l\u2019air atmosph\u00e9rique (principalement compos\u00e9 d\u2019azote et d\u2019oxyg\u00e8ne) se diffuse dans les cellules, mais ce processus est plus lent.<\/li>\n\n\n\n<li>D\u00e9s\u00e9quilibre de pression\u00a0: La perte rapide de CO\u2082 cr\u00e9e un vide temporaire ou une d\u00e9pression \u00e0 l&#039;int\u00e9rieur des cellules avant que l&#039;air ne puisse la remplacer compl\u00e8tement. Cela provoque une l\u00e9g\u00e8re contraction des cellules, entra\u00eenant une r\u00e9duction globale du volume de la mousse. Ce processus de diffusion est continu et influenc\u00e9 par la temp\u00e9rature. Une fois que la mousse atteint un \u00e9tat d&#039;\u00e9quilibre avec la pression atmosph\u00e9rique et la composition du gaz, le retrait se stabilise. <\/li>\n<\/ul>\n\n\n\n<p>Les mousses de haute qualit\u00e9 sont formul\u00e9es pour minimiser cet effet, mais il s&#039;agit d&#039;une caract\u00e9ristique fondamentale du mat\u00e9riau. Une mousse mal formul\u00e9e ou ancienne peut subir une diffusion gazeuse excessive, entra\u00eenant un retrait plus prononc\u00e9 du mastic en mousse PU.<\/p>\n\n\n\n<p><strong>2. Durcissement incorrect ou incomplet<\/strong> <\/p>\n\n\n\n<p>La mousse PU durcit par r\u00e9action avec l&#039;humidit\u00e9, qui provient de l&#039;air et du substrat sur lequel elle est appliqu\u00e9e. <\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Manque d&#039;humidit\u00e9\u00a0: Si la mousse est appliqu\u00e9e dans des conditions tr\u00e8s s\u00e8ches (faible humidit\u00e9) ou sur une surface froide et s\u00e8che, la r\u00e9action de durcissement est ralentie, voire interrompue. L&#039;ext\u00e9rieur peut former une peau, mais l&#039;int\u00e9rieur reste mou et non durci. Comme la structure interne ne d\u00e9veloppe jamais pleinement sa r\u00e9sistance, elle ne peut r\u00e9sister aux pressions internes dues \u00e0 la diffusion gazeuse, ce qui entra\u00eene un effondrement et un retrait important.<\/li>\n\n\n\n<li>\u00c9paisseur d&#039;application\u00a0: L&#039;application d&#039;un cordon de mousse trop \u00e9pais peut s&#039;av\u00e9rer probl\u00e9matique. La couche externe durcit et forme une pellicule dure, bloquant efficacement l&#039;humidit\u00e9 et emp\u00eachant le noyau interne de r\u00e9agir et de durcir compl\u00e8tement. Ce noyau non central reste fragile et peut se r\u00e9tracter avec le temps.<\/li>\n<\/ul>\n\n\n\n<p><strong>3. Fluctuations de temp\u00e9rature pendant et apr\u00e8s l&#039;application<\/strong> <\/p>\n\n\n\n<p>La temp\u00e9rature est un facteur critique dans le comportement de la mousse PU.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Pendant l&#039;application\u00a0: La bombe de mousse doit \u00eatre \u00e0 temp\u00e9rature ambiante (g\u00e9n\u00e9ralement entre 20 et 25\u00a0\u00b0C). Si la bombe ou le support est trop froid, la r\u00e9action chimique est inhib\u00e9e. La mousse ne se dilatera pas correctement et sa structure cellulaire pourrait \u00eatre fragile, ce qui la rendrait sujette au r\u00e9tr\u00e9cissement lors du r\u00e9chauffement ult\u00e9rieur.<\/li>\n\n\n\n<li>Apr\u00e8s durcissement (dilatation\/contraction thermique) : Comme la plupart des mat\u00e9riaux, la mousse PU \u00e0 cellules ferm\u00e9es durcie se dilate et se contracte avec les variations de temp\u00e9rature. Si un gros cordon de mousse est appliqu\u00e9 par temps tr\u00e8s froid et que la temp\u00e9rature ambiante augmente significativement, l&#039;application initiale peut \u00eatre \u00e0 son \u00e9tat froid maximal. En se r\u00e9chauffant, le gaz \u00e0 l&#039;int\u00e9rieur des cellules se dilate, mais le mouvement principal se produit pendant le durcissement. \u00c0 l&#039;inverse, un durcissement \u00e0 chaud suivi d&#039;un coup de froid peut entra\u00eener une contraction plus importante de la mousse que pr\u00e9vu. Il s&#039;agit d&#039;une r\u00e9action physique normale, mais elle peut \u00eatre confondue avec un retrait d\u00e9fectueux.<\/li>\n<\/ul>\n\n\n\n<p><strong>4. Produit de mauvaise qualit\u00e9 ou p\u00e9rim\u00e9<\/strong> <\/p>\n\n\n\n<p>La composition chimique des mousses d&#039;\u00e9tanch\u00e9it\u00e9 a une dur\u00e9e de vie limit\u00e9e. Avec le temps, les composants pr\u00e9m\u00e9lang\u00e9s contenus dans l&#039;a\u00e9rosol peuvent commencer \u00e0 se d\u00e9grader ou \u00e0 pr\u00e9r\u00e9agir. L&#039;utilisation d&#039;un a\u00e9rosol usag\u00e9 ou mal stock\u00e9 peut entra\u00eener une mousse \u00e0 la structure cellulaire instable, naturellement sujette \u00e0 un retrait excessif et \u00e0 de mauvaises performances.<\/p>\n\n\n\n<p><\/p>\n\n\n\n<p><\/p>\n\n\n\n<div class=\"wp-block-uagb-advanced-heading uagb-block-b6db8b7f\"><h2 class=\"uagb-heading-text\"><strong>Att\u00e9nuation et meilleures pratiques\u00a0: comment pr\u00e9venir le r\u00e9tr\u00e9cissement<\/strong><\/h2><\/div>\n\n\n\n<p>Comprendre les causes m\u00e8ne directement \u00e0 des solutions efficaces. En ma\u00eetrisant l&#039;environnement et la technique d&#039;application, vous pouvez pratiquement \u00e9liminer le probl\u00e8me de retrait des mastics en mousse PU.<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Pr\u00e9paration de la surface\u00a0: Assurez-vous toujours que la surface est propre, exempte de poussi\u00e8re et d&#039;huile. Il est essentiel de vaporiser l\u00e9g\u00e8rement la surface avec de l&#039;eau avant d&#039;appliquer la mousse. Cela permet d&#039;obtenir l&#039;humidit\u00e9 n\u00e9cessaire \u00e0 un durcissement rapide et complet.<\/li>\n\n\n\n<li>Contr\u00f4le de la temp\u00e9rature\u00a0: Conserver la bombe de mousse \u00e0 temp\u00e9rature ambiante pendant au moins 24\u00a0heures avant utilisation. Appliquer la mousse lorsque la temp\u00e9rature ambiante et celle du support sont comprises entre 5\u00a0\u00b0C et 27\u00a0\u00b0C. \u00c9viter l\u2019application en plein soleil ou sur des surfaces givr\u00e9es.<\/li>\n\n\n\n<li>Technique d&#039;application\u00a0: Appliquer la mousse en couches. Pour les cavit\u00e9s profondes, combler l&#039;ouverture par \u00e9tapes. Appliquer une premi\u00e8re couche, la laisser durcir compl\u00e8tement (elle prendra une couleur beige clair), puis appliquer une seconde couche par-dessus. Cela \u00e9vite la formation d&#039;un noyau non durci.<\/li>\n\n\n\n<li>Choisissez le bon produit\u00a0: Investissez dans des mousses d&#039;\u00e9tanch\u00e9it\u00e9 de qualit\u00e9 professionnelle. Leurs formules sont souvent plus performantes et leurs agents gonflants plus stables, ce qui permet d&#039;obtenir une mousse PU \u00e0 cellules ferm\u00e9es plus stable. V\u00e9rifiez toujours la date de p\u00e9remption indiqu\u00e9e sur l&#039;emballage.<\/li>\n\n\n\n<li>Suivez les instructions du fabricant : respectez strictement les instructions figurant sur la bo\u00eete, qui sont adapt\u00e9es \u00e0 la chimie sp\u00e9cifique de ce produit.<\/li>\n<\/ol>\n\n\n\n<p>Le Centre de l&#039;industrie des polyur\u00e9thanes (CPI) propose des guides complets sur l&#039;utilisation et l&#039;application appropri\u00e9es des produits en polyur\u00e9thane, qui sont d&#039;une valeur inestimable pour les professionnels et les bricoleurs. <\/p>\n\n\n\n<p><\/p>\n\n\n\n<div class=\"wp-block-uagb-advanced-heading uagb-block-fcab14f3\"><h2 class=\"uagb-heading-text\"><strong>Conclusion<\/strong><\/h2><\/div>\n\n\n\n<p>Le retrait d&#039;un mastic en mousse PU apr\u00e8s s\u00e9chage peut \u00eatre pr\u00e9occupant, mais il s&#039;agit souvent d&#039;un aspect pr\u00e9visible et g\u00e9rable du comportement du mat\u00e9riau. La cause principale r\u00e9side principalement dans les \u00e9changes gazeux au sein de la structure de la mousse PU \u00e0 cellules ferm\u00e9es, aggrav\u00e9s par des facteurs tels qu&#039;un durcissement incomplet et des temp\u00e9ratures extr\u00eames.<\/p>\n\n\n\n<p>Bien qu&#039;un l\u00e9ger degr\u00e9 de r\u00e9tr\u00e9cissement (g\u00e9n\u00e9ralement 1-5%) soit consid\u00e9r\u00e9 comme normal lorsque la mousse atteint l&#039;\u00e9quilibre, un r\u00e9tr\u00e9cissement important est un signal d&#039;alarme indiquant une erreur d&#039;application, des facteurs environnementaux ou un produit de qualit\u00e9 inf\u00e9rieure.<\/p>\n\n\n\n<p>En respectant la nature chimique de la mousse PU et en adh\u00e9rant aux meilleures pratiques (humidification des surfaces, contr\u00f4le de la temp\u00e9rature et application en couches), vous pouvez garantir que la mousse durcit compl\u00e8tement et forme un joint robuste et durable qui minimise le r\u00e9tr\u00e9cissement et remplit efficacement ses fonctions d&#039;isolation et de remplissage des espaces pendant des ann\u00e9es.<\/p>\n\n\n\t\t\t<div class=\"srfm-form-container srfm-form-container-2475 srfm-bg-color\">\n\t\t\t<style>\n\t\t\t\t\/* Need to check and remove the input variables related to the Style Tab. *\/\n\t\t\t\t.srfm-form-container-2475 {\n\t\t\t\t\t\/* New test variables *\/\n\t\t\t\t\t--srfm-color-scheme-primary: var(--ast-global-color-0);\n\t\t\t\t\t--srfm-color-scheme-text-on-primary: #FFFFFF;\n\t\t\t\t\t--srfm-color-scheme-text: var(--ast-global-color-2);\n\t\t\t\t\t--srfm-quill-editor-color: var(--ast-global-color-0);\n\n\t\t\t\t\t--srfm-color-input-label: var(--ast-global-color-2);\n\t\t\t\t\t--srfm-color-input-description: hsl( from var(--ast-global-color-2) h s l \/ 0.65 );\n\t\t\t\t\t--srfm-color-input-placeholder: hsl( from var(--ast-global-color-2) h s l \/ 0.5 );\n\t\t\t\t\t--srfm-color-input-text: var(--ast-global-color-2);\n\t\t\t\t\t--srfm-color-input-prefix: hsl( from 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0.9 );\n\t\t\t\t\t--srfm-btn-color-disabled: hsl( from var(--ast-global-color-0) h s l \/ 0.25 );\n\n\t\t\t\t\t\/* Dropdown Variables *\/\n\t\t\t\t\t--srfm-dropdown-input-background-hover: hsl( from var(--ast-global-color-2) h s l \/ 0.05 );\n\t\t\t\t\t--srfm-dropdown-option-background-hover: hsl( from var(--ast-global-color-2) h s l \/ 0.10 );\n\t\t\t\t\t--srfm-dropdown-option-background-selected: hsl( from var(--ast-global-color-2) h s l \/ 0.05 );\n\t\t\t\t\t--srfm-dropdown-option-selected-icon: hsl( from var(--ast-global-color-2) h s l \/ 0.65 );\n\t\t\t\t\t--srfm-dropdown-option-text-color: hsl( from var(--ast-global-color-2) h s l \/ 0.80 );\n\t\t\t\t\t--srfm-dropdown-option-selected-text: var(--ast-global-color-2);\n\t\t\t\t\t--srfm-dropdown-badge-background: hsl( from var(--ast-global-color-2) h s l \/ 0.05 );\n\t\t\t\t\t--srfm-dropdown-badge-background-hover: hsl( from var(--ast-global-color-2) h s l \/ 0.10 );\n\t\t\t\t\t--srfm-dropdown-menu-border-color: hsl( from var(--ast-global-color-2) h s l \/ 0.10 );\n\t\t\t\t\t--srfm-dropdown-placeholder-color: hsl( from var(--ast-global-color-2) h s l \/ 0.50 );\n\t\t\t\t\t--srfm-dropdown-icon-color: hsl( from var(--ast-global-color-2) h s l \/ 0.65 );\n\t\t\t\t\t--srfm-dropdown-icon-disabled: hsl( from var(--ast-global-color-2) h s l \/ 0.25 );\n\n\t\t\t\t\t\/* Background Control Variables *\/\n\t\t\t\t\t--srfm-instant-form-padding-top: 32px;--srfm-instant-form-padding-right: 32px;--srfm-instant-form-padding-bottom: 32px;--srfm-instant-form-padding-left: 32px;--srfm-instant-form-border-radius-top: 12px;--srfm-instant-form-border-radius-right: 12px;--srfm-instant-form-border-radius-bottom: 12px;--srfm-instant-form-border-radius-left: 12px;--srfm-form-padding-top: 0px;--srfm-form-padding-right: 0px;--srfm-form-padding-bottom: 0px;--srfm-form-padding-left: 0px;--srfm-form-border-radius-top: 0px;--srfm-form-border-radius-right: 0px;--srfm-form-border-radius-bottom: 0px;--srfm-form-border-radius-left: 0px;--srfm-bg-color: #ffffff;--srfm-bg-overlay-opacity: 1;\t\t\t\t\t--srfm-row-gap-between-blocks: 18px;--srfm-address-label-font-size: 16px;--srfm-address-label-line-height: 24px;--srfm-address-description-font-size: 14px;--srfm-address-description-line-height: 20px;--srfm-col-gap-between-fields: 16px;--srfm-row-gap-between-fields: 16px;--srfm-gap-below-address-label: 14px;--srfm-dropdown-font-size: 14px;--srfm-dropdown-gap-between-input-menu: 4px;--srfm-dropdown-badge-padding: 2px 6px;--srfm-dropdown-multiselect-font-size: 12px;--srfm-dropdown-multiselect-line-height: 16px;--srfm-dropdown-padding-right: 12px;--srfm-dropdown-padding-right-icon: calc( var( --srfm-dropdown-padding-right ) + 20px );--srfm-dropdown-multiselect-padding: 8px var( --srfm-dropdown-padding-right-icon ) 8px 8px;--srfm-input-height: 44px;--srfm-input-field-padding: 10px 12px;--srfm-input-field-font-size: 16px;--srfm-input-field-line-height: 24px;--srfm-input-field-margin-top: 6px;--srfm-input-field-margin-bottom: 6px;--srfm-checkbox-label-font-size: 16px;--srfm-checkbox-label-line-height: 24px;--srfm-checkbox-description-font-size: 14px;--srfm-checkbox-description-line-height: 20px;--srfm-check-ctn-width: 16px;--srfm-check-ctn-height: 16px;--srfm-check-svg-size: 10px;--srfm-checkbox-margin-top-frontend: 4px;--srfm-checkbox-margin-top-editor: 6px;--srfm-check-gap: 8px;--srfm-checkbox-description-margin-left: 24px;--srfm-flag-section-padding: 10px 0 10px 12px;--srfm-gap-between-icon-text: 8px;--srfm-label-font-size: 16px;--srfm-label-line-height: 24px;--srfm-description-font-size: 14px;--srfm-description-line-height: 20px;--srfm-btn-padding: 10px 14px;--srfm-btn-font-size: 16px;--srfm-btn-line-height: 24px;--srfm-multi-choice-horizontal-padding: 20px;--srfm-multi-choice-vertical-padding: 20px;--srfm-multi-choice-internal-option-gap: 8px;--srfm-multi-choice-vertical-svg-size: 40px;--srfm-multi-choice-horizontal-image-size: 24px;--srfm-multi-choice-vertical-image-size: 120px;--srfm-multi-choice-outer-padding: 2px;\t\t\t\t}\n\t\t\t<\/style>\n\t\t\t\t\t\t\t<form method=\"post\" enctype=\"multipart\/form-data\" id=\"srfm-form-2475\" class=\"srfm-form\"\n\t\t\t\tform-id=\"2475\" after-submission=\"hide form\" message-type=\"same page\" success-url=\"\" ajaxurl=\"https:\/\/donyanchem.com\/wp-admin\/admin-ajax.php\" data-submit-token=\"fdd053f9dc9d33aafa6fde2d8a8dac70aff87489916075d3d5d66899f93a0e56\" action=\"\"\n\t\t\t\t>\n\t\t\t\t\n\t\t\t\t<input type=\"hidden\" value=\"2475\" name=\"form-id\">\n\t\t\t\t<input type=\"hidden\" value=\"\" name=\"srfm-sender-email-field\" id=\"srfm-sender-email\">\n\t\t\t\t<input type=\"hidden\" value=\"\" id=\"srfm-page-break\">\n\t\t\t\t\t\t\t\t\t<input type=\"hidden\" value=\"\" name=\"srfm-honeypot-field\">\n\t\t\t\t\t\t\t<p id=\"srfm-error-message\" class=\"srfm-common-error-message srfm-error-message srfm-head-error\" hidden>\t\t<span class=\"srfm-icon\" aria-hidden=\"true\">\n\t\t\t<svg xmlns='http:\/\/www.w3.org\/2000\/svg' width='20' height='20' fill='none'><path d='M9.99935 18.3327C14.6017 18.3327 18.3327 14.6017 18.3327 9.99935C18.3327 5.39698 14.6017 1.66602 9.99935 1.66602C5.39698 1.66602 1.66602 5.39698 1.66602 9.99935C1.66602 14.6017 5.39698 18.3327 9.99935 18.3327Z' stroke='currentColor' stroke-width='1.5' stroke-linecap='round' stroke-linejoin='round' \/><path d='M10 6.66602V9.99935' stroke='currentColor' stroke-width='1.5' stroke-linecap='round' stroke-linejoin='round' \/><path d='M10 13.334H10.0083' stroke='currentColor' stroke-width='1.5' stroke-linecap='round' stroke-linejoin='round' \/><\/svg>\t\t<\/span>\n\t\t<span class=\"srfm-error-content\">Une erreur s&#039;est produite lors de l&#039;envoi de votre formulaire. Veuillez r\u00e9essayer.<\/span><\/p>\n\t\t\t\t\t<div data-block-id=\"60d87b1b\" class=\"srfm-block-single srfm-block srfm-input-block srf-input-60d87b1b-block  srfm-block-width-100 srfm-slug-enter-your-full-name 2397\" >\n\t\t\t\t\t\t\t\t\t\t<div class=\"srfm-block-wrap\">\n\t\t\t\t<input class=\"srfm-input-common srfm-input-input\" type=\"text\" name=\"srfm-input-60d87b1b-lbl-RW50ZXIgeW91ciBmdWxsIG5hbWU-enter-your-full-name\" id=\"srfm-input-60d87b1b-lbl-RW50ZXIgeW91ciBmdWxsIG5hbWU\"\n\t\t\t\t\taria-describedby='srfm-error-60d87b1b'\t\t\t\t\tdata-required=\"false\" aria-required=\"false\" data-unique=\"false\" maxlength=\"100\" value=\"\"  placeholder=\"Entrez votre nom complet\"  data-srfm-mask=\"none\"   \/>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"srfm-error-wrap\">\n\t\t\t\t\t\t\t\t\t\t<div class=\"srfm-error-message\" data-srfm-id=\"srfm-error-60d87b1b\" data-error-msg=\"Ce champ est n\u00e9cessaire.\" data-unique-msg=\"La valeur doit \u00eatre unique.\">\n\t\t\t\t\t\tCe champ est n\u00e9cessaire.\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t<\/div>\n\t\t\n\n\t\t\t<div data-block-id=\"fbc8c2f3\" class=\"srfm-block-single srfm-block srfm-input-block srf-input-fbc8c2f3-block  srfm-block-width-100 srfm-slug-phone-number 2397\" >\n\t\t\t\t\t\t\t\t\t\t<div class=\"srfm-block-wrap\">\n\t\t\t\t<input class=\"srfm-input-common srfm-input-input\" type=\"text\" name=\"srfm-input-fbc8c2f3-lbl-UGhvbmUgbnVtYmVy-phone-number\" id=\"srfm-input-fbc8c2f3-lbl-UGhvbmUgbnVtYmVy\"\n\t\t\t\t\taria-describedby='srfm-error-fbc8c2f3'\t\t\t\t\tdata-required=\"false\" aria-required=\"false\" data-unique=\"false\" maxlength=\"100\" value=\"\"  placeholder=\"Num\u00e9ro de t\u00e9l\u00e9phone\"  data-srfm-mask=\"none\"   \/>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"srfm-error-wrap\">\n\t\t\t\t\t\t\t\t\t\t<div class=\"srfm-error-message\" data-srfm-id=\"srfm-error-fbc8c2f3\" data-error-msg=\"Ce champ est n\u00e9cessaire.\" data-unique-msg=\"La valeur doit \u00eatre unique.\">\n\t\t\t\t\t\tCe champ est n\u00e9cessaire.\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t<\/div>\n\t\t\n\n\t\t\t<div data-block-id=\"f9fe6c7b\" class=\"srfm-block-single srfm-block srfm-email-block srf-email-f9fe6c7b-block  srfm-block-width-100 srfm-slug-your-email 2397 srfm-email-block-wrap\">\n\t\t\t\t<div class=\"srfm-email-block srf-email-f9fe6c7b-block\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"srfm-block-wrap\">\n\t\t\t\t\t\t<input class=\"srfm-input-common srfm-input-email\" type=\"email\" name=\"srfm-email-f9fe6c7b-lbl-WW91ciBlbWFpbA-your-email\" id=\"srfm-email-f9fe6c7b-lbl-WW91ciBlbWFpbA\"\n\t\t\t\t\t\taria-describedby='srfm-error-f9fe6c7b'\t\t\t\t\t\tdata-required=\"false\" aria-required=\"false\" data-unique=\"false\" value=\"\"  placeholder=\"Votre email\"   \/>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t<div class=\"srfm-error-wrap\">\n\t\t\t\t\t\t\t\t\t\t\t<div class=\"srfm-error-message\" data-srfm-id=\"srfm-error-f9fe6c7b\" data-error-msg=\"Ce champ est n\u00e9cessaire.\" data-unique-msg=\"La valeur doit \u00eatre unique.\">\n\t\t\t\t\t\tCe champ est n\u00e9cessaire.\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<\/div>\n\t\t\n\n\t\t\t<div data-block-id=\"2ae8e708\" class=\"srfm-block-single srfm-block srfm-input-block srf-input-2ae8e708-block  srfm-block-width-100 srfm-slug-service-description 2397\" >\n\t\t\t\t\t\t\t\t\t\t<div class=\"srfm-block-wrap\">\n\t\t\t\t<input class=\"srfm-input-common srfm-input-input\" type=\"text\" name=\"srfm-input-2ae8e708-lbl-U2VydmljZSBkZXNjcmlwdGlvbg-service-description\" id=\"srfm-input-2ae8e708-lbl-U2VydmljZSBkZXNjcmlwdGlvbg\"\n\t\t\t\t\taria-describedby='srfm-error-2ae8e708'\t\t\t\t\tdata-required=\"false\" aria-required=\"false\" data-unique=\"false\" maxlength=\"100\" value=\"\"  placeholder=\"Description du service\"  data-srfm-mask=\"none\"   \/>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"srfm-error-wrap\">\n\t\t\t\t\t\t\t\t\t\t<div class=\"srfm-error-message\" data-srfm-id=\"srfm-error-2ae8e708\" data-error-msg=\"Ce champ est n\u00e9cessaire.\" data-unique-msg=\"La valeur doit \u00eatre unique.\">\n\t\t\t\t\t\tCe champ est n\u00e9cessaire.\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t<\/div>\n\t\t\n\n\t\t<div data-block-id=\"b79b54a0\" class=\"srfm-block-single srfm-block srfm-textarea-block srf-textarea-b79b54a0-block  srfm-block-width-100 2397\">\n\t\t\t\t\t\t\t\t\t<div class=\"srfm-block-wrap\">\n\t\t\t\t<textarea\n\t\t\t\t\tclass=\"srfm-input-common srfm-input-textarea\"\n\t\t\t\t\tname=\"srfm-textarea-b79b54a0-lbl-TWVzc2FnZQ-message\"\n\t\t\t\t\tid=\"srfm-textarea-b79b54a0-lbl-TWVzc2FnZQ-8735\"\n\t\t\t\t\taria-describedby='srfm-error-b79b54a0'\t\t\t\t\tdata-required=\"false\" aria-required=\"false\"  rows=\"4\"   placeholder=\"Message\" \t\t\t\t\t\t\t\t\t\t\t\t\t\t\t><\/textarea>\n\t\t\t\t\t\t\t<\/div>\n\t\t\t<div class=\"srfm-error-wrap\">\n\t\t\t\t\t\t\t<\/div>\n\t\t<\/div>\n\n\t\t\t\t\t\t\t\n\t\t\t\t\t\n\t\t\t\t\t<div class=\"srfm-submit-container\" style=\"\">\n\t\t\t\t\t\t<div style=\"width: ; text-align: left\" class=\"wp-block-button\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<button style=\"\" id=\"srfm-submit-btn\" class=\"srfm-btn-frontend srfm-button srfm-submit-button\"\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t>\n\t\t\t\t\t\t\t\t<div class=\"srfm-submit-wrap\">\n\t\t\t\t\t\t\t\t\tOBTENEZ UN DEVIS GRATUIT\t\t\t\t\t\t\t\t<div class=\"srfm-loader\"><\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<\/button>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<p id=\"srfm-error-message\" class=\"srfm-common-error-message srfm-error-message srfm-footer-error\" hidden>\t\t<span class=\"srfm-icon\" aria-hidden=\"true\">\n\t\t\t<svg xmlns='http:\/\/www.w3.org\/2000\/svg' width='20' height='20' fill='none'><path d='M9.99935 18.3327C14.6017 18.3327 18.3327 14.6017 18.3327 9.99935C18.3327 5.39698 14.6017 1.66602 9.99935 1.66602C5.39698 1.66602 1.66602 5.39698 1.66602 9.99935C1.66602 14.6017 5.39698 18.3327 9.99935 18.3327Z' stroke='currentColor' stroke-width='1.5' stroke-linecap='round' stroke-linejoin='round' \/><path d='M10 6.66602V9.99935' stroke='currentColor' stroke-width='1.5' stroke-linecap='round' stroke-linejoin='round' \/><path d='M10 13.334H10.0083' stroke='currentColor' stroke-width='1.5' stroke-linecap='round' stroke-linejoin='round' \/><\/svg>\t\t<\/span>\n\t\t<span class=\"srfm-error-content\">Une erreur s&#039;est produite lors de l&#039;envoi de votre formulaire. Veuillez r\u00e9essayer.<\/span><\/p>\n\t\t\t\t\t<input type=\"hidden\" name=\"trp-form-language\" value=\"fr\"\/><\/form>\n\t\t\t<div class=\"srfm-single-form srfm-success-box in-page\">\n\t\t\t\t<div aria-live=\"polite\" aria-atomic=\"true\" role=\"alert\" id=\"srfm-success-message-page-2475\" class=\"srfm-success-box-description\"><\/div>\n\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\n\n\n\n<p><\/p>","protected":false},"excerpt":{"rendered":"<p>PU (Polyurethane) foam sealant is a staple in construction and DIY projects, renowned for its exceptional sealing, insulating, and gap-filling capabilities. However, users are sometimes alarmed to observe a noticeable shrinkage or pulling away from surfaces after the foam has fully cured. This phenomenon can compromise the seal, reduce insulation value, and lead to drafts [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":4127,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_uag_custom_page_level_css":"","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":"disabled","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","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":"","background-image":"","background-repeat":"repeat","background-position":"center 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Team","author_link":"https:\/\/donyanchem.com\/fr\/author\/stella-ye26gmail-com\/"},"uagb_comment_info":0,"uagb_excerpt":"PU (Polyurethane) foam sealant is a staple in construction and DIY projects, renowned for its exceptional sealing, insulating, and gap-filling capabilities. However, users are sometimes alarmed to observe a noticeable shrinkage or pulling away from surfaces after the foam has fully cured. 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