{"id":3652,"date":"2026-02-13T15:14:59","date_gmt":"2026-02-13T07:14:59","guid":{"rendered":"https:\/\/quartz-grinding.epic-powder.com\/?p=3652"},"modified":"2026-03-19T15:08:27","modified_gmt":"2026-03-19T07:08:27","slug":"jet-milling-vs-ball-milling-which-is-best-for-silicon-micropowder-for-copper-clad-laminates","status":"publish","type":"post","link":"https:\/\/quartz-grinding.epic-powder.com\/fr\/jet-milling-vs-ball-milling-which-is-best-for-silicon-micropowder-for-copper-clad-laminates\/","title":{"rendered":"Broyage par jet d&#039;air ou broyage \u00e0 billes\u00a0: lequel est le meilleur pour la micropoudre de silicium destin\u00e9e aux stratifi\u00e9s cuivr\u00e9s\u00a0?"},"content":{"rendered":"<p>Dans la production de stratifi\u00e9s cuivr\u00e9s (CCL) \u2014 le mat\u00e9riau de base des cartes de circuits imprim\u00e9s (PCB) \u2014 <a href=\"https:\/\/quartz-grinding.epic-powder.com\/fr\/\">micropoudre de silicium<\/a> La poudre de silice (principalement de silice fondue ou de silice cristalline) sert de charge inorganique principale. Elle influence consid\u00e9rablement des propri\u00e9t\u00e9s cl\u00e9s telles que la constante di\u00e9lectrique (Dk), le facteur de dissipation (Df), le coefficient de dilatation thermique (CTE), la conductivit\u00e9 thermique, l&#039;absorption d&#039;humidit\u00e9, la facilit\u00e9 de per\u00e7age et la fiabilit\u00e9 globale des circuits imprim\u00e9s haute fr\u00e9quence, haute vitesse et de type substrat.<\/p>\n\n\n\n<p>Les caract\u00e9ristiques des particules de micropoudre de silicium \u2014 notamment la taille (D50, D97), la distribution granulom\u00e9trique, la morphologie (sph\u00e9ricit\u00e9, rapport d&#039;aspect), la surface sp\u00e9cifique et surtout le niveau de puret\u00e9\/contamination \u2014 d\u00e9terminent directement les performances du stratifi\u00e9 final. Deux technologies courantes de broyage \u00e0 sec pour la pr\u00e9paration de micropoudre de silicium sont le broyage \u00e0 billes et le broyage \u00e0 jet (\u00e9galement appel\u00e9 broyage \u00e0 jet oppos\u00e9 en lit fluidis\u00e9 ou broyage \u00e0 jet d&#039;air). Quelle m\u00e9thode est la plus adapt\u00e9e aux applications CCL haut de gamme\u00a0?<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Principes de base et comparaison<\/h2>\n\n\n\n<figure class=\"wp-block-image size-full\"><img fetchpriority=\"high\" decoding=\"async\" width=\"750\" height=\"660\" src=\"https:\/\/quartz-grinding.epic-powder.com\/wp-content\/uploads\/2025\/11\/quartz-ball-mill-and-classification-production-line.webp\" alt=\"ligne de production de broyeur \u00e0 billes de quartz et de classification\" class=\"wp-image-3532\" srcset=\"https:\/\/quartz-grinding.epic-powder.com\/wp-content\/uploads\/2025\/11\/quartz-ball-mill-and-classification-production-line.webp 750w, https:\/\/quartz-grinding.epic-powder.com\/wp-content\/uploads\/2025\/11\/quartz-ball-mill-and-classification-production-line-300x264.webp 300w, https:\/\/quartz-grinding.epic-powder.com\/wp-content\/uploads\/2025\/11\/quartz-ball-mill-and-classification-production-line-14x12.webp 14w\" sizes=\"(max-width: 750px) 100vw, 750px\" \/><figcaption class=\"wp-element-caption\">ligne de production de broyeur \u00e0 billes de quartz et de classification<\/figcaption><\/figure>\n\n\n\n<p><strong><a href=\"https:\/\/quartz-grinding.epic-powder.com\/fr\/machines\/ball-mill\/\">Broyeur \u00e0 billes<\/a><\/strong>Le broyage \u00e0 billes utilise l&#039;impact m\u00e9canique, le cisaillement et l&#039;abrasion entre les \u00e9l\u00e9ments de broyage (billes, barres ou cylindres, g\u00e9n\u00e9ralement en c\u00e9ramique ou en m\u00e9tal) et le mat\u00e9riau contenu dans un r\u00e9cipient rotatif. C&#039;est une m\u00e9thode \u00e9prouv\u00e9e, \u00e9conomique et \u00e0 haut d\u00e9bit.<\/p>\n\n\n\n<p><strong><a href=\"https:\/\/quartz-grinding.epic-powder.com\/fr\/machines\/jet-mill\/\">Broyeur \u00e0 jets<\/a><\/strong>Le broyage par jet d&#039;air repose sur les collisions \u00e0 grande vitesse entre les particules, acc\u00e9l\u00e9r\u00e9es par des jets d&#039;air comprim\u00e9 ou de vapeur (sans milieu de broyage). Les particules entrent en collision, se fracturent et sont class\u00e9es en un seul processus continu, g\u00e9n\u00e9ralement \u00e0 l&#039;aide de broyeurs \u00e0 jets oppos\u00e9s \u00e0 lit fluidis\u00e9 pour les mat\u00e9riaux durs comme la silice.<\/p>\n\n\n\n<p>Principales diff\u00e9rences :<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th>Propri\u00e9t\u00e9<\/th><th>Broyeur \u00e0 billes<\/th><th>Broyeur \u00e0 jets<\/th><th>Avantage de la poudre de silicone CCL<\/th><\/tr><\/thead><tbody><tr><td>D50 r\u00e9alisable<\/td><td>Typiquement 3\u201310 \u03bcm (ultra-fin difficile)<\/td><td>0,5\u20133 \u03bcm (atteint facilement le submicron)<\/td><td>Jet Mill mieux<\/td><\/tr><tr><td>Distribution granulom\u00e9trique<\/td><td>Port\u00e9e plus large, queues plus grossi\u00e8res<\/td><td>Distribution plus \u00e9troite et plus nette<\/td><td>Jet Mill mieux<\/td><\/tr><tr><td>Forme des particules<\/td><td>Plus irr\u00e9gulier, rapport d&#039;aspect plus \u00e9lev\u00e9, angulaire<\/td><td>Plus proche de la sph\u00e8re ou de la forme cubique, rapport d&#039;aspect plus faible<\/td><td>Le broyage par jet d&#039;air est meilleur (moins d&#039;agglom\u00e9ration).<\/td><\/tr><tr><td>Risque de contamination<\/td><td>Moyen \u00e0 \u00e9lev\u00e9 (l&#039;usure des m\u00e9dias introduit du Fe, du Zr, de l&#039;Al, etc.)<\/td><td>Tr\u00e8s faible (pas de m\u00e9dia, possibilit\u00e9 d&#039;utiliser des rev\u00eatements en c\u00e9ramique)<\/td><td>Le broyage par jet d&#039;air est nettement plus efficace.<\/td><\/tr><tr><td>Puret\u00e9 (Fe, ions m\u00e9talliques)<\/td><td>\u00c9l\u00e9ments ind\u00e9sirables plus \u00e9lev\u00e9s (en particulier Fe\/Co)<\/td><td>\u00c9l\u00e9ments de trampoline inf\u00e9rieurs<\/td><td>Le broyage par jet d&#039;air est meilleur.<\/td><\/tr><tr><td>g\u00e9n\u00e9ration de chaleur<\/td><td>Mod\u00e9r\u00e9 (peut provoquer un \u00e9chauffement local)<\/td><td>Quasiment aucun (broyage \u00e0 froid)<\/td><td>Le fraisage par jet d&#039;air est pr\u00e9f\u00e9rable pour la stabilit\u00e9.<\/td><\/tr><tr><td>\u00c9nergie et co\u00fbts d&#039;exploitation<\/td><td>Inf\u00e9rieur<\/td><td>Consommation de gaz \u00e0 haute pression plus \u00e9lev\u00e9e<\/td><td>broyeur \u00e0 billes meilleur<\/td><\/tr><tr><td>D\u00e9bit et \u00e9volutivit\u00e9<\/td><td>Haut<\/td><td>Moyen<\/td><td>Le broyeur \u00e0 boulets est plus adapt\u00e9 aux op\u00e9rations en vrac.<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">Exigences sp\u00e9cifiques pour les stratifi\u00e9s cuivr\u00e9s contenant de la micropoudre de silicium<\/h2>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"801\" height=\"523\" src=\"https:\/\/quartz-grinding.epic-powder.com\/wp-content\/uploads\/2026\/02\/Copper-Clad-Laminate.webp\" alt=\"Stratifi\u00e9 plaqu\u00e9 cuivre\" class=\"wp-image-3654\" srcset=\"https:\/\/quartz-grinding.epic-powder.com\/wp-content\/uploads\/2026\/02\/Copper-Clad-Laminate.webp 801w, https:\/\/quartz-grinding.epic-powder.com\/wp-content\/uploads\/2026\/02\/Copper-Clad-Laminate-300x196.webp 300w, https:\/\/quartz-grinding.epic-powder.com\/wp-content\/uploads\/2026\/02\/Copper-Clad-Laminate-768x501.webp 768w, https:\/\/quartz-grinding.epic-powder.com\/wp-content\/uploads\/2026\/02\/Copper-Clad-Laminate-18x12.webp 18w\" sizes=\"(max-width: 801px) 100vw, 801px\" \/><\/figure>\n\n\n\n<p>Les CCL haute fr\u00e9quence modernes (5G, radars automobiles, substrats serveurs\/IA, mat\u00e9riaux \u00e0 faible Dk\/Df) n\u00e9cessitent de la micropoudre de silicium avec\u00a0:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>D50 g\u00e9n\u00e9ralement de 2 \u00e0 5 \u03bcm, parfois &lt; 2 \u03bcm pour les formulations \u00e0 tr\u00e8s faible Dk\/Df<\/li>\n\n\n\n<li>Distribution granulom\u00e9trique tr\u00e8s \u00e9troite (faible \u00e9tendue) pour assurer un remplissage uniforme en r\u00e9sine et minimiser les zones riches\/d\u00e9ficientes en r\u00e9sine.<\/li>\n\n\n\n<li>Sph\u00e9ricit\u00e9 \u00e9lev\u00e9e ou faible rapport d&#039;aspect pour am\u00e9liorer la fluidit\u00e9, r\u00e9duire la viscosit\u00e9 de la r\u00e9sine, augmenter la charge de remplissage (jusqu&#039;\u00e0 70\u201390 % en poids)<\/li>\n\n\n\n<li>Contamination ionique\/m\u00e9tallique extr\u00eamement faible (en particulier Fe &lt; 10\u201320 ppm) afin d&#039;\u00e9viter les pertes di\u00e9lectriques, la migration \u00e9lectrochimique et les d\u00e9faillances de fiabilit\u00e9.<\/li>\n\n\n\n<li>Bonne dispersibilit\u00e9 apr\u00e8s traitement de surface (couplage silane)<\/li>\n<\/ul>\n\n\n\n<p>Le broyeur \u00e0 billes peut r\u00e9pondre aux exigences de CCL (D50 ~4\u20138 \u03bcm) pour les mat\u00e9riaux sensibles aux co\u00fbts et \u00e0 moyenne et basse fr\u00e9quence, mais il pr\u00e9sente des difficult\u00e9s pour l&#039;obtention de particules ultrafines, d&#039;une distribution granulom\u00e9trique \u00e9troite et surtout de puret\u00e9. L&#039;usure du m\u00e9dia introduit des traces de m\u00e9taux difficiles \u00e0 \u00e9liminer compl\u00e8tement, m\u00eame par lavage acide ou s\u00e9paration magn\u00e9tique, ce qui augmente les co\u00fbts et peut alt\u00e9rer l&#039;activit\u00e9 de surface des particules.<\/p>\n\n\n\n<p>Le broyeur \u00e0 jet excelle dans la production de micropoudre de silicium ultrafine, de haute puret\u00e9 et \u00e0 distribution granulom\u00e9trique \u00e9troite, indispensable aux couches minces de haute qualit\u00e9. De nombreux fournisseurs de silice fondue de premier plan pour applications \u00e9lectroniques utilisent des broyeurs \u00e0 jet \u00e0 lit fluidis\u00e9 (souvent avec rev\u00eatements en c\u00e9ramique ou en carbure de silicium) pour atteindre un D50 &lt; 3 \u03bcm avec une contamination minimale. Ceci est particuli\u00e8rement critique pour les substrats \u00e0 faibles pertes et haute fiabilit\u00e9.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"750\" height=\"750\" src=\"https:\/\/quartz-grinding.epic-powder.com\/wp-content\/uploads\/2025\/10\/air-jet-mill-5-1.webp\" alt=\"broyeur \u00e0 jet d&#039;air 5\" class=\"wp-image-3386\" srcset=\"https:\/\/quartz-grinding.epic-powder.com\/wp-content\/uploads\/2025\/10\/air-jet-mill-5-1.webp 750w, https:\/\/quartz-grinding.epic-powder.com\/wp-content\/uploads\/2025\/10\/air-jet-mill-5-1-300x300.webp 300w, https:\/\/quartz-grinding.epic-powder.com\/wp-content\/uploads\/2025\/10\/air-jet-mill-5-1-150x150.webp 150w, https:\/\/quartz-grinding.epic-powder.com\/wp-content\/uploads\/2025\/10\/air-jet-mill-5-1-12x12.webp 12w\" sizes=\"(max-width: 750px) 100vw, 750px\" \/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">Questions connexes et r\u00e9ponses d\u00e9taill\u00e9es<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">Q1 : Pourquoi la \u00ab distribution granulom\u00e9trique \u00e9troite \u00bb produite par ces usines est-elle si cruciale pour les stratifi\u00e9s cuivr\u00e9s ?<\/h3>\n\n\n\n<p>Dans la production de CCL, la micropoudre de silicium est utilis\u00e9e comme charge dans les r\u00e9sines \u00e9poxy. Si la distribution granulom\u00e9trique est trop large (trop de particules \u00ab surdimensionn\u00e9es \u00bb ou \u00ab ultrafines \u00bb), plusieurs probl\u00e8mes surviennent\u00a0:<\/p>\n\n\n\n<p><strong>Viscosit\u00e9 de la r\u00e9sine :<\/strong> Un trop grand nombre de particules ultrafines augmente la surface, ce qui n\u00e9cessite davantage de r\u00e9sine et rend le m\u00e9lange difficile \u00e0 appliquer sur le tissu de verre.<\/p>\n\n\n\n<p><strong>D\u00e9fauts des stratifi\u00e9s\u00a0:<\/strong> Les grosses particules (plus de 20 \u03bcm) peuvent provoquer des \u00ab micro-courts-circuits \u00bb ou des irr\u00e9gularit\u00e9s dans les couches de feuilles de cuivre ultra-minces des PCB haute densit\u00e9. <\/p>\n\n\n\n<p><strong>R\u00e9pondre:<\/strong> La distribution \u00e9troite assur\u00e9e par le classificateur d&#039;air de l&#039;usine garantit une dilatation thermique uniforme (faible CTE) et des propri\u00e9t\u00e9s \u00e9lectriques constantes sur l&#039;ensemble de la carte.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Q2 : Le broyage par jet d&#039;air et le broyage \u00e0 billes peuvent-ils \u00eatre utilis\u00e9s ensemble pour la micropoudre de silicium ?<\/h3>\n\n\n\n<p><strong>R\u00e9pondre:<\/strong> Oui, il s&#039;agit souvent de la r\u00e9f\u00e9rence en mati\u00e8re de charges \u00e9lectroniques haut de gamme. Dans un proc\u00e9d\u00e9 hybride, le mat\u00e9riau est d&#039;abord broy\u00e9 dans un broyeur \u00e0 billes pour obtenir une granulom\u00e9trie fine et une forme plus arrondie. Il est ensuite trait\u00e9 par un broyeur \u00e0 jet d&#039;air ou un classificateur pneumatique de haute pr\u00e9cision d\u00e9di\u00e9 afin d&#039;\u00e9liminer les particules les plus grosses et d&#039;affiner davantage le D97. Cette combinaison allie la rentabilit\u00e9 du broyage \u00e0 billes \u00e0 l&#039;extr\u00eame pr\u00e9cision et \u00e0 la puret\u00e9 du broyage\/classification par jet d&#039;air.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Conclusion : Lequel est le meilleur ?<\/h2>\n\n\n\n<p>Pour les CCL FR-4 ordinaires ou de milieu de gamme, le broyage \u00e0 billes reste un choix rentable.<\/p>\n\n\n\n<p>Pour les CCL haute fr\u00e9quence, haute vitesse, faible Dk\/Df, \u00e0 faibles pertes ou HDI\/encapsulation avanc\u00e9e \u2014 qui dominent la demande actuelle et future \u2014 le broyage par jet est clairement sup\u00e9rieur et est devenu la m\u00e9thode pr\u00e9f\u00e9r\u00e9e de l&#039;industrie pour la pr\u00e9paration de micropoudre de silicium haut de gamme.<\/p>\n\n\n\n<p>De nombreux fabricants de CCL de premier plan sp\u00e9cifient la silice fondue broy\u00e9e par jet dans leurs formulations pr\u00e9cis\u00e9ment en raison de ses avantages en termes de puret\u00e9, de contr\u00f4le de la taille des particules, de morphologie et, en fin de compte, de meilleures performances \u00e9lectriques, thermiques et de fiabilit\u00e9.<\/p>\n\n\n\n<p>En bref: <a href=\"https:\/\/quartz-grinding.epic-powder.com\/fr\/contact\/\">fraisage par jet d&#039;air<\/a> est le meilleur choix pour la micropoudre de silicium utilis\u00e9e dans les stratifi\u00e9s cuivr\u00e9s haute performance.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-css-opacity is-style-default\"\/>\n\n\n\n<figure class=\"wp-block-image aligncenter size-full is-resized is-style-rounded\"><img loading=\"lazy\" decoding=\"async\" width=\"721\" height=\"721\" src=\"https:\/\/quartz-grinding.epic-powder.com\/wp-content\/uploads\/2025\/11\/Emily-Chen.webp\" alt=\"Emily Chen\" class=\"wp-image-3549\" style=\"width:150px;height:150px\" srcset=\"https:\/\/quartz-grinding.epic-powder.com\/wp-content\/uploads\/2025\/11\/Emily-Chen.webp 721w, https:\/\/quartz-grinding.epic-powder.com\/wp-content\/uploads\/2025\/11\/Emily-Chen-300x300.webp 300w, https:\/\/quartz-grinding.epic-powder.com\/wp-content\/uploads\/2025\/11\/Emily-Chen-150x150.webp 150w, https:\/\/quartz-grinding.epic-powder.com\/wp-content\/uploads\/2025\/11\/Emily-Chen-12x12.webp 12w\" sizes=\"(max-width: 721px) 100vw, 721px\" \/><\/figure>\n\n\n\n<blockquote class=\"wp-block-quote has-text-align-center is-style-large is-layout-flow wp-block-quote-is-layout-flow\">\n<p>\u00ab Merci de votre lecture. J\u2019esp\u00e8re que cet article vous sera utile. N\u2019h\u00e9sitez pas \u00e0 laisser un commentaire ci-dessous. Pour toute question, vous pouvez \u00e9galement contacter le service client en ligne de Zelda. \u00bb<\/p>\n<cite>                                                                                                                                                                              \u2014 Publi\u00e9 par <a href=\"https:\/\/www.linkedin.com\/company\/76603359\/admin\/dashboard\/\">Emily Chen<\/a><\/cite><\/blockquote>\n\n\n\n<hr class=\"wp-block-separator has-css-opacity is-style-default\"\/>\n\n\n\n<div class=\"wp-block-contact-form-7-contact-form-selector\">\n<div class=\"wpcf7 no-js\" id=\"wpcf7-f16-o1\" lang=\"zh-CN\" dir=\"ltr\" data-wpcf7-id=\"16\">\n<div class=\"screen-reader-response\"><p role=\"status\" aria-live=\"polite\" aria-atomic=\"true\"><\/p> <ul><\/ul><\/div>\n<form action=\"\/fr\/wp-json\/wp\/v2\/posts\/3652#wpcf7-f16-o1\" method=\"post\" class=\"wpcf7-form init\" aria-label=\"\u7559\u8a00\u8868\u5355\" novalidate=\"novalidate\" data-status=\"init\" data-trp-original-action=\"\/fr\/wp-json\/wp\/v2\/posts\/3652#wpcf7-f16-o1\">\n<div style=\"display: none;\">\n<input type=\"hidden\" name=\"_wpcf7\" value=\"16\" \/>\n<input type=\"hidden\" name=\"_wpcf7_version\" value=\"6.0.6\" \/>\n<input type=\"hidden\" name=\"_wpcf7_locale\" value=\"zh_CN\" \/>\n<input type=\"hidden\" name=\"_wpcf7_unit_tag\" value=\"wpcf7-f16-o1\" \/>\n<input type=\"hidden\" name=\"_wpcf7_container_post\" value=\"0\" \/>\n<input type=\"hidden\" name=\"_wpcf7_posted_data_hash\" value=\"\" \/>\n<\/div>\n<div class=\"keen-form\">\n\t<div class=\"one-half\">\n\t\t<p><span class=\"wpcf7-form-control-wrap\" data-name=\"your-name\"><input size=\"40\" maxlength=\"400\" class=\"wpcf7-form-control wpcf7-text wpcf7-validates-as-required\" aria-required=\"true\" aria-invalid=\"false\" placeholder=\"Votre nom*\" value=\"\" type=\"text\" name=\"your-name\" \/><\/span>\n\t\t<\/p>\n\t<\/div>\n\t<div class=\"one-half last\">\n\t\t<p><span class=\"wpcf7-form-control-wrap\" data-name=\"your-email\"><input size=\"40\" maxlength=\"400\" class=\"wpcf7-form-control wpcf7-email wpcf7-validates-as-required wpcf7-text wpcf7-validates-as-email\" aria-required=\"true\" aria-invalid=\"false\" placeholder=\"Votre email*\" value=\"\" type=\"email\" name=\"your-email\" \/><\/span>\n\t\t<\/p>\n\t<\/div>\n\t<div class=\"one-half\">\n\t\t<p><span class=\"wpcf7-form-control-wrap\" data-name=\"pnone\"><input size=\"40\" maxlength=\"400\" class=\"wpcf7-form-control wpcf7-tel wpcf7-validates-as-required wpcf7-text wpcf7-validates-as-tel\" aria-required=\"true\" aria-invalid=\"false\" placeholder=\"Votre Pnone ou Whatsapp*\" value=\"\" type=\"tel\" name=\"pnone\" \/><\/span>\n\t\t<\/p>\n\t<\/div>\n\t<div class=\"one-half last\">\n\t\t<p><span class=\"wpcf7-form-control-wrap\" data-name=\"your-subject\"><input size=\"40\" maxlength=\"400\" class=\"wpcf7-form-control wpcf7-text\" aria-invalid=\"false\" placeholder=\"Votre entreprise\" value=\"\" type=\"text\" name=\"your-subject\" \/><\/span>\n\t\t<\/p>\n\t<\/div>\n\t<div>\n\t\t<p><span class=\"wpcf7-form-control-wrap\" data-name=\"your-message\"><textarea cols=\"40\" rows=\"3\" maxlength=\"2000\" class=\"wpcf7-form-control wpcf7-textarea\" aria-invalid=\"false\" placeholder=\"Votre message\" name=\"your-message\"><\/textarea><\/span>\n\t\t<\/p>\n\t<\/div>\n\t<div>\n\t\t<p><input class=\"wpcf7-form-control wpcf7-submit has-spinner\" type=\"submit\" value=\"Soumettre\" \/>\n\t\t<\/p>\n\t<\/div>\n<\/div>\n<style>\n.keen-form div{margin-bottom:5px;}\n.keen-form div p{margin-bottom:0px !important;}\n.one-half,.one-third {\n position: relative;\n margin-right: 4%;\n float: left;\n z-index: 99;\n}\n.one-half { width: 48%; 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