{"id":5030,"date":"2026-08-17T02:46:00","date_gmt":"2026-08-17T02:46:00","guid":{"rendered":"https:\/\/roadskymarking.com\/?p=5030"},"modified":"2026-08-17T02:47:01","modified_gmt":"2026-08-17T02:47:01","slug":"aashto-m247-glass-beads-for-road-marking","status":"publish","type":"post","link":"https:\/\/roadskymarking.com\/it\/aashto-m247-glass-beads-for-road-marking.html","title":{"rendered":"AASHTO M247: perline di vetro per la segnaletica orizzontale"},"content":{"rendered":"<p>Se lavori con <strong><a style=\"text-decoration: underline;\" href=\"https:\/\/roadskymarking.com\/it\/road-marking-material\/\" data-type=\"link\" data-id=\"https:\/\/roadskymarking.com\/road-marking-material\" target=\"_blank\" rel=\"noreferrer noopener\">materiali per la segnaletica stradale<\/a><\/strong>, probabilmente vi sarete gi\u00e0 imbattuti nelle perline di vetro AASHTO M247. Si tratta di piccole perline di vetro, ma svolgono un ruolo molto importante nel rendere pi\u00f9 visibili le segnalazioni stradali, soprattutto di notte.<\/p>\n\n\n\n<p>In parole semplici, la norma AASHTO M247 \u00e8 una specifica relativa alle perline di vetro che vengono sparse o spruzzate sulla segnaletica orizzontale per creare una segnaletica stradale retroriflettente. La versione attuale \u00e8 la AASHTO M 247-13(2022), che rappresenta l\u2019edizione attuale della specifica, nuovamente approvata.<\/p>\n\n\n\n<p>Ma allora, cosa sono esattamente queste perline di vetro, come funzionano e a cosa bisogna prestare attenzione quando le si acquista? Vediamolo pi\u00f9 da vicino.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"600\" height=\"400\" src=\"https:\/\/roadskymarking.com\/wp-content\/uploads\/2026\/08\/What-Are-AASHTO-M247-Glass-Beads.jpg\" alt=\"Cosa sono le perle di vetro AASHTO M247\" class=\"wp-image-5032\" srcset=\"https:\/\/roadskymarking.com\/wp-content\/uploads\/2026\/08\/What-Are-AASHTO-M247-Glass-Beads.jpg 600w, https:\/\/roadskymarking.com\/wp-content\/uploads\/2026\/08\/What-Are-AASHTO-M247-Glass-Beads-400x267.jpg 400w, https:\/\/roadskymarking.com\/wp-content\/uploads\/2026\/08\/What-Are-AASHTO-M247-Glass-Beads-18x12.jpg 18w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><\/figure><\/div>\n\n\n<div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_86 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Indice dei contenuti<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Allinea la tabella dei contenuti\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewbox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewbox=\"0 0 24 24\" version=\"1.2\" baseprofile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/roadskymarking.com\/it\/aashto-m247-glass-beads-for-road-marking.html\/#What_Are_AASHTO_M247_Glass_Beads\" >Cosa sono le perle di vetro AASHTO M247?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/roadskymarking.com\/it\/aashto-m247-glass-beads-for-road-marking.html\/#How_Do_Glass_Beads_Make_Road_Markings_Reflective\" >In che modo le perline di vetro rendono riflettenti le segnalazioni stradali?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/roadskymarking.com\/it\/aashto-m247-glass-beads-for-road-marking.html\/#AASHTO_M247_Glass_Bead_Types\" >Tipi di perle di vetro secondo la norma AASHTO M247<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/roadskymarking.com\/it\/aashto-m247-glass-beads-for-road-marking.html\/#Important_Quality_Requirements\" >Requisiti di qualit\u00e0 importanti<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/roadskymarking.com\/it\/aashto-m247-glass-beads-for-road-marking.html\/#1_Refractive_Index\" >1. Indice di rifrazione<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/roadskymarking.com\/it\/aashto-m247-glass-beads-for-road-marking.html\/#2_Roundness\" >2. Rotondit\u00e0<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/roadskymarking.com\/it\/aashto-m247-glass-beads-for-road-marking.html\/#3_Clean_and_Transparent_Glass\" >3. Vetro pulito e trasparente<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/roadskymarking.com\/it\/aashto-m247-glass-beads-for-road-marking.html\/#4_Moisture_Resistance\" >4. Resistenza all'umidit\u00e0<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/roadskymarking.com\/it\/aashto-m247-glass-beads-for-road-marking.html\/#5_Bead_Gradation\" >5. Gradazione delle perline<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/roadskymarking.com\/it\/aashto-m247-glass-beads-for-road-marking.html\/#Where_Are_AASHTO_M247_Glass_Beads_Used\" >In quali ambiti vengono utilizzate le perle di vetro AASHTO M247?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/roadskymarking.com\/it\/aashto-m247-glass-beads-for-road-marking.html\/#Drop-On_Glass_Beads_vs_Premix_Glass_Beads\" >Perline di vetro \u201cDrop-On\u201d vs. perline di vetro premiscelate<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/roadskymarking.com\/it\/aashto-m247-glass-beads-for-road-marking.html\/#Why_Bead_Embedment_Matters\" >Perch\u00e9 l'incorporazione delle perline \u00e8 importante<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/roadskymarking.com\/it\/aashto-m247-glass-beads-for-road-marking.html\/#How_to_Choose_the_Right_AASHTO_M247_Glass_Beads\" >Come scegliere le perle di vetro AASHTO M247 pi\u00f9 adatte<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"https:\/\/roadskymarking.com\/it\/aashto-m247-glass-beads-for-road-marking.html\/#What_type_of_road_marking_material_are_you_using\" >Che tipo di materiale per la segnaletica orizzontale state utilizzando?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-15\" href=\"https:\/\/roadskymarking.com\/it\/aashto-m247-glass-beads-for-road-marking.html\/#What_bead_type_does_the_project_specification_require\" >Quale tipo di perline \u00e8 previsto dalle specifiche del progetto?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-16\" href=\"https:\/\/roadskymarking.com\/it\/aashto-m247-glass-beads-for-road-marking.html\/#What_level_of_nighttime_visibility_is_required\" >Qual \u00e8 il livello di visibilit\u00e0 notturna richiesto?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-17\" href=\"https:\/\/roadskymarking.com\/it\/aashto-m247-glass-beads-for-road-marking.html\/#Will_the_beads_be_used_in_a_humid_environment\" >Le perline verranno utilizzate in un ambiente umido?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-18\" href=\"https:\/\/roadskymarking.com\/it\/aashto-m247-glass-beads-for-road-marking.html\/#Can_the_supplier_provide_test_reports\" >Il fornitore \u00e8 in grado di fornire i rapporti di prova?<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-19\" href=\"https:\/\/roadskymarking.com\/it\/aashto-m247-glass-beads-for-road-marking.html\/#Final_Thoughts\" >Considerazioni finali<\/a><\/li><\/ul><\/nav><\/div>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"What_Are_AASHTO_M247_Glass_Beads\"><\/span>Cosa sono le perle di vetro AASHTO M247?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Le perle di vetro AASHTO M247 sono particelle di vetro trasparenti e sferiche utilizzate con i materiali per la segnaletica orizzontale quali <strong><a href=\"https:\/\/roadskymarking.com\/it\/road-marking-paint\/\" data-type=\"link\" data-id=\"https:\/\/roadskymarking.com\/road-marking-paint\" target=\"_blank\" rel=\"noreferrer noopener\" style=\"text-decoration: underline;\">vernice per il traffico<\/a><\/strong>, <strong><a href=\"https:\/\/roadskymarking.com\/it\/thermoplastic-road-marking-paint.html\/\" data-type=\"link\" data-id=\"https:\/\/roadskymarking.com\/thermoplastic-road-marking-paint.html\" target=\"_blank\" rel=\"noreferrer noopener\" style=\"text-decoration: underline;\">termoplastico<\/a><\/strong>, e altri sistemi di segnaletica orizzontale.<\/p>\n\n\n\n<p>Il loro compito principale \u00e8 quello di migliorare il <strong><a href=\"https:\/\/roadskymarking.com\/it\/7-factors-that-affect-road-marking-line-reflectivity.html\/\" data-type=\"link\" data-id=\"https:\/\/roadskymarking.com\/7-factors-that-affect-road-marking-line-reflectivity.html\" target=\"_blank\" rel=\"noreferrer noopener\" style=\"text-decoration: underline;\">retroriflettivit\u00e0 della segnaletica orizzontale<\/a><\/strong>.<\/p>\n\n\n\n<p>Quando i fari di un veicolo illuminano una segnaletica orizzontale, le microsfere di vetro catturano e reindirizzano parte di quella luce verso il conducente. Ci\u00f2 rende le linee stradali bianche e gialle molto pi\u00f9 visibili in condizioni di scarsa illuminazione.<\/p>\n\n\n\n<p>Ci\u00f2 \u00e8 particolarmente importante sulle autostrade, sulle superstrade, agli incroci, sui passaggi pedonali e su altre strade in cui la visibilit\u00e0 notturna \u00e8 fondamentale.<\/p>\n\n\n\n<p>La FHWA descrive le perline di vetro conformi alla norma AASHTO M247 come uno standard del settore e una soluzione economicamente vantaggiosa per garantire la retroriflettivit\u00e0 della segnaletica orizzontale.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"How_Do_Glass_Beads_Make_Road_Markings_Reflective\"><\/span>In che modo le perline di vetro rendono riflettenti le segnalazioni stradali?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Il principio \u00e8 in realt\u00e0 piuttosto semplice.<\/p>\n\n\n\n<p>Una perlina di vetro funziona come una minuscola lente ottica.<\/p>\n\n\n\n<p>Quando la luce dei fari di un veicolo entra nel profilo, la superficie curva del vetro la rifrange e contribuisce a reindirizzarla verso la fonte luminosa. Poich\u00e9 la luce viene reindirizzata verso il conducente, la segnaletica orizzontale appare luminosa di notte.<\/p>\n\n\n\n<p>Senza perline di vetro, una linea di demarcazione stradale dipinta pu\u00f2 comunque essere visibile durante il giorno, ma la sua visibilit\u00e0 notturna pu\u00f2 risultare molto inferiore.<\/p>\n\n\n\n<p>Ecco perch\u00e9 le perline di vetro vengono spesso chiamate <strong><a href=\"https:\/\/roadskymarking.com\/it\/glass-beads.html\/\" data-type=\"link\" data-id=\"https:\/\/roadskymarking.com\/glass-beads.html\" target=\"_blank\" rel=\"noreferrer noopener\" style=\"text-decoration: underline;\">perline di vetro retroriflettenti o perline di vetro per segnaletica orizzontale<\/a><\/strong>.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"600\" height=\"400\" src=\"https:\/\/roadskymarking.com\/wp-content\/uploads\/2026\/08\/AASHTO-M247-Glass-Bead-Types.jpg\" alt=\"Tipi di perle di vetro secondo la norma AASHTO M247\" class=\"wp-image-5033\" srcset=\"https:\/\/roadskymarking.com\/wp-content\/uploads\/2026\/08\/AASHTO-M247-Glass-Bead-Types.jpg 600w, https:\/\/roadskymarking.com\/wp-content\/uploads\/2026\/08\/AASHTO-M247-Glass-Bead-Types-400x267.jpg 400w, https:\/\/roadskymarking.com\/wp-content\/uploads\/2026\/08\/AASHTO-M247-Glass-Bead-Types-18x12.jpg 18w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><\/figure><\/div>\n\n\n<div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"AASHTO_M247_Glass_Bead_Types\"><\/span>Tipi di perle di vetro secondo la norma AASHTO M247<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Un aspetto che pu\u00f2 creare confusione quando si acquistano perle di vetro conformi alla norma AASHTO M247 \u00e8 la variet\u00e0 di tipi disponibili.<\/p>\n\n\n\n<p>La specifica definisce:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Tipo 0<\/strong> \u2013 gradazione uniforme<\/li>\n\n\n\n<li><strong>Tipo 1<\/strong> \u2013 gradazione standard<\/li>\n\n\n\n<li><strong>Tipo 2<\/strong> \u2013 gradazione modificata<\/li>\n\n\n\n<li><strong>Tipo 3<\/strong> \u2013 gradazione modificata<\/li>\n\n\n\n<li><strong>Tipo 4<\/strong> \u2013 gradazione modificata<\/li>\n\n\n\n<li><strong>Tipo 5<\/strong> \u2013 gradazione modificata<\/li>\n<\/ul>\n\n\n\n<p>Le diverse tipologie dipendono principalmente dalla distribuzione granulometrica, ovvero dalla gradazione, delle sfere.<\/p>\n\n\n\n<p>Ad esempio, le perline pi\u00f9 piccole vengono comunemente utilizzate in applicazioni in cui \u00e8 richiesta una gradazione pi\u00f9 fine, mentre quelle pi\u00f9 grandi possono rivelarsi utili in applicazioni in cui si desidera una maggiore esposizione delle perline e una maggiore durata.<\/p>\n\n\n\n<p>Quindi, non limitatevi a chiedere a un fornitore delle \u201cperle di vetro AASHTO M247\u201d. \u00c8 meglio specificare il tipo e la granulometria richiesti in base al vostro sistema di segnaletica orizzontale e alle specifiche del progetto.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Important_Quality_Requirements\"><\/span>Requisiti di qualit\u00e0 importanti<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>La norma AASHTO M247 non riguarda semplicemente le dimensioni dei granuli. Per garantire prestazioni costanti, sono importanti diverse propriet\u00e0.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"1_Refractive_Index\"><\/span>1. Indice di rifrazione<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>Una delle propriet\u00e0 pi\u00f9 importanti \u00e8 l'indice di rifrazione.<\/p>\n\n\n\n<p>La norma AASHTO M247 specifica un indice di rifrazione compreso approssimativamente tra 1,50 e 1,55 per le microsfere di vetro.<\/p>\n\n\n\n<p>L'indice di rifrazione influisce sull'efficienza con cui la luce penetra e si propaga all'interno della perlina.<\/p>\n\n\n\n<p>In pratica, per ottenere un\u2019elevata retroriflettivit\u00e0 notturna \u00e8 fondamentale che le propriet\u00e0 ottiche siano ottimali.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"2_Roundness\"><\/span>2. Rotondit\u00e0<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>Anche la forma della perlina \u00e8 importante.<\/p>\n\n\n\n<p>Idealmente, le sfere di vetro dovrebbero essere il pi\u00f9 possibile sferiche. I requisiti della norma AASHTO M247 prevedono una percentuale minima di sfere perfettamente sferiche, mentre le specifiche commerciali indicano comunemente una percentuale minima di sfere perfettamente sferiche pari a 70%.<\/p>\n\n\n\n<p>Perch\u00e9 \u00e8 importante?<\/p>\n\n\n\n<p>Questo perch\u00e9 una perlina rotonda funziona pi\u00f9 o meno come una minuscola lente. Le particelle irregolari o frammentate potrebbero non garantire le stesse prestazioni ottiche.<\/p>\n\n\n\n<p>Una migliore rotondit\u00e0 pu\u00f2 inoltre favorire un flusso pi\u00f9 uniforme delle perline attraverso le attrezzature di applicazione.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"3_Clean_and_Transparent_Glass\"><\/span>3. Vetro pulito e trasparente<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>Le perline devono essere pulite, asciutte e trasparenti.<\/p>\n\n\n\n<p>La presenza eccessiva di bolle, graffi, difetti superficiali, contaminazioni o altre imperfezioni pu\u00f2 compromettere le prestazioni ottiche.<\/p>\n\n\n\n<p>Una buona sferetta di vetro per segnaletica orizzontale dovrebbe apparire trasparente, piuttosto che opaca o fortemente contaminata.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"4_Moisture_Resistance\"><\/span>4. Resistenza all'umidit\u00e0<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>L'umidit\u00e0 pu\u00f2 causare problemi durante lo stoccaggio e l'applicazione.<\/p>\n\n\n\n<p>Se le perline assorbono umidit\u00e0 o formano grumi, potrebbero non scorrere correttamente attraverso l\u2019erogatore. Ci\u00f2 pu\u00f2 causare una distribuzione non uniforme sulla segnaletica orizzontale.<\/p>\n\n\n\n<p>La norma AASHTO M247 prevede requisiti relativi ai rivestimenti e alla resistenza all\u2019umidit\u00e0, a seconda delle esigenze dell\u2019acquirente.<\/p>\n\n\n\n<p>Per i progetti in climi umidi o piovosi, il trattamento resistente all'umidit\u00e0 pu\u00f2 quindi rappresentare un fattore importante da tenere in considerazione.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"5_Bead_Gradation\"><\/span>5. Gradazione delle perline<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>La gradazione indica come sono distribuite le dimensioni delle perline.<\/p>\n\n\n\n<p>Ad esempio, la specifica utilizza le dimensioni dei setacci per determinare la percentuale di materiale che passa attraverso le diverse aperture dei setacci. I diversi tipi di M247 presentano requisiti di granulometria diversi.<\/p>\n\n\n\n<p>Questo \u00e8 importante perch\u00e9 la dimensione della goccia deve essere adeguata al metodo di applicazione e al materiale di marcatura.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"600\" height=\"400\" src=\"https:\/\/roadskymarking.com\/wp-content\/uploads\/2026\/08\/Where-Are-AASHTO-M247-Glass-Beads-Used.jpg\" alt=\"Dove vengono utilizzate le perle di vetro conformi alla norma AASHTO M247\" class=\"wp-image-5034\" srcset=\"https:\/\/roadskymarking.com\/wp-content\/uploads\/2026\/08\/Where-Are-AASHTO-M247-Glass-Beads-Used.jpg 600w, https:\/\/roadskymarking.com\/wp-content\/uploads\/2026\/08\/Where-Are-AASHTO-M247-Glass-Beads-Used-400x267.jpg 400w, https:\/\/roadskymarking.com\/wp-content\/uploads\/2026\/08\/Where-Are-AASHTO-M247-Glass-Beads-Used-18x12.jpg 18w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><\/figure><\/div>\n\n\n<div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Where_Are_AASHTO_M247_Glass_Beads_Used\"><\/span>In quali ambiti vengono utilizzate le perle di vetro AASHTO M247?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Le perline di vetro AASHTO M247 sono ampiamente utilizzate per diverse applicazioni di segnaletica orizzontale.<\/p>\n\n\n\n<p>Tra le applicazioni pi\u00f9 comuni figurano:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Segnaletica autostradale<\/li>\n\n\n\n<li>Linee di contorno<\/li>\n\n\n\n<li>Linee centrali<\/li>\n\n\n\n<li>Simboli stradali e frecce<\/li>\n\n\n\n<li>Attraversamenti pedonali<\/li>\n\n\n\n<li>Linee di arresto<\/li>\n\n\n\n<li>Segnaletica orizzontale per il controllo del traffico<\/li>\n\n\n\n<li>Segnaletica orizzontale aeroportuale, ove specificato<\/li>\n\n\n\n<li>Segnaletica orizzontale urbana<\/li>\n\n\n\n<li>Segnaletica sulle autostrade e sulle superstrade<\/li>\n<\/ul>\n\n\n\n<p>Possono essere utilizzati con diversi tipi di materiali di marcatura, a seconda delle esigenze del progetto.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Drop-On_Glass_Beads_vs_Premix_Glass_Beads\"><\/span>Perline di vetro \u201cDrop-On\u201d vs. perline di vetro premiscelate<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Parleremo anche delle perle di vetro \u201cdrop-on\u201d e delle perle di vetro premiscelate.<\/p>\n\n\n\n<p>I granuli da spargere vengono applicati sulla superficie del materiale di segnaletica orizzontale appena posato. I granuli si incastrano parzialmente nella segnaletica, pur rimanendo sufficientemente esposti da garantire la retroriflettivit\u00e0.<\/p>\n\n\n\n<p>Le perline premiscelate, invece, vengono mescolate al materiale di marcatura prima dell\u2019applicazione.<\/p>\n\n\n\n<p>Molti sistemi di segnaletica orizzontale utilizzano una combinazione di diverse dimensioni dei granuli e metodi di applicazione per ottenere le prestazioni desiderate.<\/p>\n\n\n\n<p>L'approccio corretto dipende dal tipo di materiale di segnaletica, dall'attrezzatura utilizzata, dalle condizioni del traffico e dalle specifiche del progetto.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"600\" height=\"400\" src=\"https:\/\/roadskymarking.com\/wp-content\/uploads\/2026\/08\/Why-Bead-Embedment-Matters.jpg\" alt=\"Perch\u00e9 l&#039;incorporazione delle perline \u00e8 importante\" class=\"wp-image-5035\" srcset=\"https:\/\/roadskymarking.com\/wp-content\/uploads\/2026\/08\/Why-Bead-Embedment-Matters.jpg 600w, https:\/\/roadskymarking.com\/wp-content\/uploads\/2026\/08\/Why-Bead-Embedment-Matters-400x267.jpg 400w, https:\/\/roadskymarking.com\/wp-content\/uploads\/2026\/08\/Why-Bead-Embedment-Matters-18x12.jpg 18w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><\/figure><\/div>\n\n\n<div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Why_Bead_Embedment_Matters\"><\/span>Perch\u00e9 l'incorporazione delle perline \u00e8 importante<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>L'acquisto di perle di vetro AASHTO M247 di alta qualit\u00e0 \u00e8 solo una parte del lavoro.<\/p>\n\n\n\n<p>Anche il modo in cui vengono applicate le perline \u00e8 altrettanto importante.<\/p>\n\n\n\n<p>Se le perline sono incastonate troppo in profondit\u00e0 nel materiale di segnaletica, la superficie di vetro esposta potrebbe non essere sufficiente a garantire un'efficace retroriflessione.<\/p>\n\n\n\n<p>Se sono posizionati troppo in alto rispetto alla superficie, potrebbero essere pi\u00f9 esposti all\u2019usura causata dal traffico e al rischio di smarrimento.<\/p>\n\n\n\n<p>L'obiettivo \u00e8 ottenere il giusto livello di incasso ed esposizione del cordone.<\/p>\n\n\n\n<p>Questo \u00e8 uno dei motivi per cui le imprese specializzate nella segnaletica orizzontale prestano particolare attenzione alla temperatura di applicazione, allo spessore del materiale, alla velocit\u00e0 di fuoriuscita del cordone e alle attrezzature utilizzate.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"How_to_Choose_the_Right_AASHTO_M247_Glass_Beads\"><\/span>Come scegliere le perle di vetro AASHTO M247 pi\u00f9 adatte<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Se state cercando perline di vetro per un progetto di segnaletica orizzontale, vi suggerisco di partire da queste domande:<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"What_type_of_road_marking_material_are_you_using\"><\/span>Che tipo di materiale per la segnaletica orizzontale state utilizzando?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>La vernice stradale, il materiale termoplastico e altri sistemi di segnaletica possono richiedere granuli di dimensioni diverse e metodi di applicazione differenti.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"What_bead_type_does_the_project_specification_require\"><\/span>Quale tipo di perline \u00e8 previsto dalle specifiche del progetto?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>Non dare per scontato che il Tipo 1 sia sempre la scelta giusta. Controlla prima la documentazione del progetto.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"What_level_of_nighttime_visibility_is_required\"><\/span>Qual \u00e8 il livello di visibilit\u00e0 notturna richiesto?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>La realizzazione di segnaletica orizzontale ad alte prestazioni potrebbe richiedere un sistema di granuli progettato con cura, piuttosto che il semplice utilizzo di una maggiore quantit\u00e0 di granuli.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Will_the_beads_be_used_in_a_humid_environment\"><\/span>Le perline verranno utilizzate in un ambiente umido?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>In tal caso, potrebbe essere opportuno prendere in considerazione un trattamento resistente all'umidit\u00e0.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Can_the_supplier_provide_test_reports\"><\/span>Il fornitore \u00e8 in grado di fornire i rapporti di prova?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>Ci\u00f2 \u00e8 particolarmente importante per i progetti infrastrutturali governativi, autostradali e internazionali.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Final_Thoughts\"><\/span>Considerazioni finali<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>La norma AASHTO M247 rimane una delle specifiche fondamentali da conoscere quando si acquistano granuli di vetro per la segnaletica orizzontale. La versione attualmente in vigore \u00e8 la AASHTO M 247-13(2022), che riguarda i granuli di vetro utilizzati per la realizzazione di segnaletica orizzontale riflettente.<\/p>\n\n\n\n<p>Se state acquistando perline di vetro conformi alla norma AASHTO M247 per la segnaletica orizzontale, prestate attenzione a tre aspetti: conformit\u00e0 alle specifiche, qualit\u00e0 delle perline e prestazioni applicative.<\/p>","protected":false},"excerpt":{"rendered":"<p>If you work with road marking materials, you have probably come across AASHTO M247 glass beads. They are small glass beads, but they play a very important role in making road markings easier to see, especially at night. In simple terms, AASHTO M247 is a specification for glass beads that are dropped or sprayed onto pavement markings to create a retroreflective road marking. The current version is AASHTO M 247-13(2022), which is the reapproved current edition of the specification. So, what exactly are these glass beads, how do they work, and what should you check when buying them? Let&#8217;s take a closer look. What Are AASHTO M247 Glass Beads? AASHTO M247 glass beads are transparent, spherical glass particles used with pavement marking materials such as traffic paint, thermoplastic, and other road marking systems. Their main job is to improve the retroreflectivity of road markings. When a vehicle&#8217;s headlights shine on a road marking, the glass beads capture and redirect part &#8230;<\/p>","protected":false},"author":1,"featured_media":5032,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[6],"tags":[],"class_list":["post-5030","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-knowledge"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.2 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>AASHTO M247 Glass Beads for Road Marking - Roadsky<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/roadskymarking.com\/it\/aashto-m247-glass-beads-for-road-marking.html\/\" \/>\n<meta property=\"og:locale\" content=\"it_IT\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"AASHTO M247 Glass Beads for Road Marking - Roadsky\" \/>\n<meta property=\"og:description\" content=\"If you work with road marking materials, you have probably come across AASHTO M247 glass beads. They are small glass beads, but they play a very important role in making road markings easier to see, especially at night. In simple terms, AASHTO M247 is a specification for glass beads that are dropped or sprayed onto pavement markings to create a retroreflective road marking. The current version is AASHTO M 247-13(2022), which is the reapproved current edition of the specification. So, what exactly are these glass beads, how do they work, and what should you check when buying them? Let&#8217;s take a closer look. What Are AASHTO M247 Glass Beads? AASHTO M247 glass beads are transparent, spherical glass particles used with pavement marking materials such as traffic paint, thermoplastic, and other road marking systems. Their main job is to improve the retroreflectivity of road markings. When a vehicle&#8217;s headlights shine on a road marking, the glass beads capture and redirect part ...\" \/>\n<meta property=\"og:url\" content=\"https:\/\/roadskymarking.com\/it\/aashto-m247-glass-beads-for-road-marking.html\/\" \/>\n<meta property=\"og:site_name\" content=\"Nanjing Roadsky Traffic Facility Co.,Ltd. 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They are small glass beads, but they play a very important role in making road markings easier to see, especially at night. In simple terms, AASHTO M247 is a specification for glass beads that are dropped or sprayed onto pavement markings to create a retroreflective road marking. The current version is AASHTO M 247-13(2022), which is the reapproved current edition of the specification. So, what exactly are these glass beads, how do they work, and what should you check when buying them? Let&#8217;s take a closer look. What Are AASHTO M247 Glass Beads? AASHTO M247 glass beads are transparent, spherical glass particles used with pavement marking materials such as traffic paint, thermoplastic, and other road marking systems. Their main job is to improve the retroreflectivity of road markings. When a vehicle&#8217;s headlights shine on a road marking, the glass beads capture and redirect part ...","og_url":"https:\/\/roadskymarking.com\/it\/aashto-m247-glass-beads-for-road-marking.html\/","og_site_name":"Nanjing Roadsky Traffic Facility Co.,Ltd. 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