{"id":5374,"date":"2022-07-13T14:04:36","date_gmt":"2022-07-13T14:04:36","guid":{"rendered":"https:\/\/longchangchemical.com\/?p=5374"},"modified":"2026-04-28T10:42:03","modified_gmt":"2026-04-28T10:42:03","slug":"what-are-the-performance-advantages-of-tpo-waterproofing-roll-roofing-material","status":"publish","type":"post","link":"https:\/\/longchangchemical.com\/fr\/what-are-the-performance-advantages-of-tpo-waterproofing-roll-roofing-material\/","title":{"rendered":"Quels sont les avantages du mat\u00e9riau d'\u00e9tanch\u00e9it\u00e9 TPO pour les toitures en rouleaux ?"},"content":{"rendered":"<h1><strong>Quels sont les avantages du mat\u00e9riau d'\u00e9tanch\u00e9it\u00e9 TPO pour les toitures en rouleaux ?<\/strong><\/h1>\n<p><!-- lc-qa-start --><\/p>\n<p><strong>Quick answer:<\/strong> In most UV systems, photoinitiators are selected by balancing wavelength fit, through-cure, color control, and line speed. Buyers usually compare a blended package instead of one isolated product.<\/p>\n<p><!-- lc-qa-end --><\/p>\n<p>Avec le d\u00e9veloppement des objectifs nationaux de r\u00e9duction des \u00e9missions de carbone, les mat\u00e9riaux de construction \u00e9cologiques, les toitures photovolta\u00efques et d'autres domaines connexes ont fait l'objet d'une grande attention de la part des praticiens. L'int\u00e9gration des b\u00e2timents photovolta\u00efques est un syst\u00e8me de production d'\u00e9nergie solaire photovolta\u00efque con\u00e7u, construit et install\u00e9 en m\u00eame temps que le b\u00e2timent et formant une combinaison parfaite avec ce dernier. La membrane d'\u00e9tanch\u00e9it\u00e9 TPO poss\u00e8de d'excellentes performances d'\u00e9tanch\u00e9it\u00e9, une excellente r\u00e9sistance aux intemp\u00e9ries et d'excellentes performances de soudage \u00e0 l'air chaud, une r\u00e9sistance \u00e9lev\u00e9e \u00e0 la traction, un allongement \u00e9lev\u00e9, une construction de toiture humide, expos\u00e9e sans besoin de couche de protection, une construction facile, aucune pollution et d'autres caract\u00e9ristiques, peut parfaitement r\u00e9pondre aux exigences de durabilit\u00e9 ultra-longue du sc\u00e9nario expos\u00e9, peut parfaitement r\u00e9pondre aux besoins de la toiture photovolta\u00efque avec une dur\u00e9e de vie de plus de 25 ans. En outre, la bobine blanche a une bonne r\u00e9flectivit\u00e9 \u00e0 la lumi\u00e8re du jour, peut r\u00e9duire efficacement la temp\u00e9rature int\u00e9rieure et contribuer \u00e0 am\u00e9liorer l'efficacit\u00e9 de la production d'\u00e9nergie ; en m\u00eame temps, elle est facile \u00e0 r\u00e9parer, les co\u00fbts de r\u00e9paration tardive et d'entretien sont faibles, et on peut dire qu'elle l'est une fois pour toutes. Quels sont donc les avantages du mat\u00e9riau d'\u00e9tanch\u00e9it\u00e9 TPO pour toiture en rouleau ?<\/p>\n<p>Le TPO est une polyol\u00e9fine thermoplastique compos\u00e9e de caoutchouc et de polyol\u00e9fine, deux composants des mat\u00e9riaux \u00e9lastom\u00e8res. Le mat\u00e9riau d'\u00e9tanch\u00e9it\u00e9 TPO pour toiture en rouleau est constitu\u00e9 de r\u00e9sine TPO, \u00e0 laquelle on ajoute, selon les besoins, des modificateurs (tels que des retardateurs de flamme, des absorbeurs d'ultraviolets, des stabilisateurs de lumi\u00e8re, etc. Dans la pratique, la membrane d'\u00e9tanch\u00e9it\u00e9 TPO pr\u00e9sente une r\u00e9sistance au vieillissement, une r\u00e9sistance \u00e9lev\u00e9e \u00e0 la traction et \u00e0 l'allongement, une construction de toiture humide, une exposition sans couche protectrice, une construction pratique, une absence de pollution et de nombreux autres avantages, et convient parfaitement comme couche d'\u00e9tanch\u00e9it\u00e9 de toiture l\u00e9g\u00e8re et \u00e9conome en \u00e9nergie.<\/p>\n<p>1. Le mat\u00e9riau d'\u00e9tanch\u00e9it\u00e9 TPO pour toiture en rouleau combine les avantages des performances de l'EPDM et du PVC, avec la r\u00e9sistance aux intemp\u00e9ries et la douceur du premier et les caract\u00e9ristiques de soudabilit\u00e9 du second. Ce mat\u00e9riau, contrairement aux plastiques traditionnels, pr\u00e9sente une grande \u00e9lasticit\u00e9 de caoutchouc \u00e0 temp\u00e9rature ambiante et peut \u00eatre moul\u00e9 comme du plastique \u00e0 haute temp\u00e9rature.<\/p>\n<p>2. Excellente r\u00e9sistance aux UV, r\u00e9sistance au vieillissement naturel ; ne contient pas de plastifiants, n'est pas sujet aux infiltrations de plastifiants, \u00e0 la migration et au vieillissement rapide, ce qui prolonge la dur\u00e9e de vie de la bobine, l'effet d'imperm\u00e9abilit\u00e9 pouvant atteindre jusqu'\u00e0 50 ans.<\/p>\n<p>3, excellente r\u00e9sistance \u00e0 la perforation ; bonne construction de la soudure \u00e0 l'air chaud, la force d'adh\u00e9rence du joint soud\u00e9 est sup\u00e9rieure \u00e0 celle de la bobine elle-m\u00eame, de sorte que l'ensemble de la couche imperm\u00e9able forme un tout.<\/p>\n<p>4. Excellente r\u00e9sistance aux chocs \u00e0 basse temp\u00e9rature (-40 \u2103) et \u00e0 la d\u00e9formation, avec une r\u00e9sistance \u00e9lev\u00e9e \u00e0 la d\u00e9chirure et un allongement \u00e9lev\u00e9 \u00e0 la rupture. Bonne r\u00e9sistance \u00e0 la p\u00e9n\u00e9tration des racines, peut \u00eatre transform\u00e9 en toit de plantation.<\/p>\n<p>5\u3001Excellente r\u00e9sistance aux substances chimiques, bonne r\u00e9sistance \u00e0 divers acides, alcalis, huiles, bact\u00e9ries, champignons et algues caus\u00e9s par la d\u00e9gradation ; protection de l'environnement et possibilit\u00e9 de recyclage.<\/p>\n<h2><\/h2>\n<p><!-- lc-commercial-start --><\/p>\n<h2>How formulators usually evaluate this photoinitiator topic<\/h2>\n<p>When technical buyers or formulators screen photoinitiators, the most useful decision frame is usually cure quality plus application fit: which package cures reliably, keeps appearance acceptable, and still works under the lamp, film thickness, and substrate conditions of the actual process.<\/p>\n<ul>\n<li><strong>Match the package to the lamp first:<\/strong> mercury lamps, UV LEDs, and visible-light systems can rank the same photoinitiators very differently.<\/li>\n<li><strong>Check depth cure and surface cure separately:<\/strong> a film that feels dry on top can still be weak underneath.<\/li>\n<li><strong>Balance yellowing with reactivity:<\/strong> the strongest deep-cure route is not always the best commercial choice if color or migration risk becomes unacceptable.<\/li>\n<li><strong>Use the final formula as the benchmark:<\/strong> pigment load, monomer package, and film thickness can all change the apparent ranking of the same initiator.<\/li>\n<\/ul>\n<h3>Recommended product references<\/h3>\n<ul>\n<li><strong><a href=\"https:\/\/longchangchemical.com\/fr\/product\/photoinitiator-tpo-l-cas-84434-11-7\/\">CHLUMINIT TPO-L<\/a>:<\/strong> A strong low-yellowing reference for LED-oriented UV systems.<\/li>\n<li><strong><a href=\"https:\/\/longchangchemical.com\/fr\/product\/cas-270586-78-2\/\">CHLUMINIT TMO<\/a>:<\/strong> A valuable comparison point when lower yellowing or TPO-replacement discussions matter.<\/li>\n<li><strong><a href=\"https:\/\/longchangchemical.com\/fr\/product\/photoinitiator-819-irgacure-819-cas-162881-26-7\/\">CHLUMINIT 819<\/a>:<\/strong> Useful when a formulation needs stronger absorption and deeper cure support.<\/li>\n<li><strong><a href=\"https:\/\/longchangchemical.com\/fr\/product\/irgacure-1173-cas-7473-98-5\/\">CHLUMINIT 1173<\/a>:<\/strong> A practical comparison point for classic short-wave UV initiation.<\/li>\n<\/ul>\n<h3>FAQ for buyers and formulators<\/h3>\n<p><strong>Why are blended photoinitiator packages so common?<\/strong><br \/>Because one product may control yellowing or lamp fit well while another improves cure depth or line-speed performance, so the full package is often stronger than any single grade.<\/p>\n<p><strong>Should incomplete cure always be solved by adding more initiator?<\/strong><br \/>Not automatically. The real limitation may be the lamp, film thickness, pigment shading, or the rest of the reactive system rather than simple under-dosage.<\/p>\n<p><!-- lc-commercial-end --><\/p>\n<h2><strong><b>Contactez-nous d\u00e8s maintenant !<\/b><\/strong><\/h2>\n<h4><strong><b>Si vous avez besoin de Price, veuillez indiquer vos coordonn\u00e9es dans le formulaire ci-dessous. Nous vous contacterons g\u00e9n\u00e9ralement dans les 24 heures. Vous pouvez \u00e9galement m'envoyer un courriel <span style=\"color: #00ccff;\"><a style=\"color: #00ccff;\" href=\"mailto:info@longchangchemical.com\">info@longchangchemical.com<\/a><\/span>\u00a0pendant les heures de travail ( 8:30 am to 6:00 pm UTC+8 Mon.~Sat. ) ou utilisez le chat en direct du site web pour obtenir une r\u00e9ponse rapide.<\/b><\/strong><\/h4>\n<p>&nbsp;<\/p>\n<table style=\"border-collapse: collapse; width: 435.77pt;\" border=\"0\" width=\"581\" cellspacing=\"0\" cellpadding=\"0\">\n<tbody>\n<tr style=\"height: 13.50pt;\">\n<td style=\"height: 13.50pt; width: 215.25pt;\" width=\"287\" height=\"18\"><a href=\"https:\/\/longchangchemical.com\/fr\/product\/photoinitiator-tpo-cas-75980-60-8\/\"><span style=\"color: #00ccff;\">Photoinitiateur TPO<\/span><\/a><\/td>\n<td style=\"width: 220.50pt;\" width=\"294\">CAS 75980-60-8<\/td>\n<\/tr>\n<tr style=\"height: 13.50pt;\">\n<td style=\"height: 13.50pt;\" height=\"18\"><a href=\"https:\/\/longchangchemical.com\/fr\/product\/cas-270586-78-2\/\"><span style=\"color: #00ccff;\">Photoinitiateur TMO<\/span><\/a><\/td>\n<td>CAS 270586-78-2<\/td>\n<\/tr>\n<tr style=\"height: 13.50pt;\">\n<td style=\"height: 13.50pt;\" height=\"18\"><a href=\"https:\/\/longchangchemical.com\/fr\/product\/photoinitiator-pd-01-cas-579-07-7\/\"><span style=\"color: #00ccff;\">Photoinitiateur PD-01<\/span><\/a><\/td>\n<td>CAS 579-07-7<\/td>\n<\/tr>\n<tr style=\"height: 13.50pt;\">\n<td style=\"height: 13.50pt;\" height=\"18\"><a href=\"https:\/\/longchangchemical.com\/fr\/product\/photoinitiator-pbz-cas-2128-93-0\/\"><span style=\"color: #00ccff;\">Photoinitiateur PBZ<\/span><\/a><\/td>\n<td>CAS 2128-93-0<\/td>\n<\/tr>\n<tr style=\"height: 13.50pt;\">\n<td style=\"height: 13.50pt;\" height=\"18\"><a href=\"https:\/\/longchangchemical.com\/fr\/product\/photoinitiator-oxe-02-cas-478556-66-0\/\"><span style=\"color: #00ccff;\">Photoinitiateur OXE-02<\/span><\/a><\/td>\n<td>CAS 478556-66-0<\/td>\n<\/tr>\n<tr style=\"height: 13.50pt;\">\n<td style=\"height: 13.50pt;\" height=\"18\"><a href=\"https:\/\/longchangchemical.com\/fr\/product\/photoinitiator-ombb\/\"><span style=\"color: #00ccff;\">Photoinitiateur OMBB<\/span><\/a><\/td>\n<td>CAS 606-28-0<\/td>\n<\/tr>\n<tr style=\"height: 13.50pt;\">\n<td style=\"height: 13.50pt;\" height=\"18\"><a href=\"https:\/\/longchangchemical.com\/fr\/product\/photoinitiator-mpbz-6012\/\"><span style=\"color: #00ccff;\">Photoinitiateur MPBZ (6012)<\/span><\/a><\/td>\n<td>CAS 86428-83-3<\/td>\n<\/tr>\n<tr style=\"height: 13.50pt;\">\n<td style=\"height: 13.50pt;\" height=\"18\"><a href=\"https:\/\/longchangchemical.com\/fr\/product\/photoinitiator-mbp-cas-134-84-9\/\"><span style=\"color: #00ccff;\">Photoinitiateur MBP<\/span><\/a><\/td>\n<td>CAS 134-84-9<\/td>\n<\/tr>\n<tr style=\"height: 13.50pt;\">\n<td style=\"height: 13.50pt;\" height=\"18\"><a href=\"https:\/\/longchangchemical.com\/fr\/product\/photoinitiator-mbf-cas-15206-55-0\/\"><span style=\"color: #00ccff;\">Photoinitiateur MBF<\/span><\/a><\/td>\n<td>CAS 15206-55-0<\/td>\n<\/tr>\n<tr style=\"height: 13.50pt;\">\n<td style=\"height: 13.50pt;\" height=\"18\"><a href=\"https:\/\/longchangchemical.com\/fr\/product\/photoinitiator-lap-cas-85073-19-4\/\"><span style=\"color: #00ccff;\">Photoinitiateur LAP<\/span><\/a><\/td>\n<td>CAS 85073-19-4<\/td>\n<\/tr>\n<tr style=\"height: 13.50pt;\">\n<td style=\"height: 13.50pt;\" height=\"18\"><a href=\"https:\/\/longchangchemical.com\/fr\/product\/photoinitiator-itx-cas-5495-84-1\/\"><span style=\"color: #00ccff;\">Photoinitiateur ITX<\/span><\/a><\/td>\n<td>CAS 5495-84-1<\/td>\n<\/tr>\n<tr style=\"height: 13.50pt;\">\n<td style=\"height: 13.50pt;\" height=\"18\"><a href=\"https:\/\/longchangchemical.com\/fr\/product\/photoinitiator-emk\/\"><span style=\"color: #00ccff;\">Photoinitiateur EMK<\/span><\/a><\/td>\n<td>CAS 90-93-7<\/td>\n<\/tr>\n<tr style=\"height: 13.50pt;\">\n<td style=\"height: 13.50pt;\" height=\"18\"><a href=\"https:\/\/longchangchemical.com\/fr\/product\/photoinitiator-eha-cas-21245-02-3\/\"><span style=\"color: #00ccff;\">Photoinitiateur EHA<\/span><\/a><\/td>\n<td>CAS 21245-02-3<\/td>\n<\/tr>\n<tr style=\"height: 13.50pt;\">\n<td style=\"height: 13.50pt;\" height=\"18\"><a href=\"https:\/\/longchangchemical.com\/fr\/product\/photoinitiator-edb-cas-10287-53-3\/\"><span style=\"color: #00ccff;\">Photo-initiateur EDB<\/span><\/a><\/td>\n<td>CAS 10287-53-3<\/td>\n<\/tr>\n<tr style=\"height: 13.50pt;\">\n<td style=\"height: 13.50pt;\" height=\"18\"><a href=\"https:\/\/longchangchemical.com\/fr\/product\/photoinitiator-detx-cas-82799-44-8\/\"><span style=\"color: #00ccff;\">Photoinitiateur DETX<\/span><\/a><\/td>\n<td>CAS 82799-44-8<\/td>\n<\/tr>\n<tr style=\"height: 13.50pt;\">\n<td style=\"height: 13.50pt;\" height=\"18\"><a href=\"https:\/\/longchangchemical.com\/fr\/product\/photoinitiator-cq\/\"><span style=\"color: #00ccff;\">Photoinitiateur CQ \/ Camphorquinone<\/span><\/a><\/td>\n<td>CAS 10373-78-1<\/td>\n<\/tr>\n<tr style=\"height: 13.50pt;\">\n<td style=\"height: 13.50pt;\" height=\"18\"><a href=\"https:\/\/longchangchemical.com\/fr\/product\/photoinitiator-cbp-cas-134-85-0\/\"><span style=\"color: #00ccff;\">Photoinitiateur CBP<\/span><\/a><\/td>\n<td>CAS 134-85-0<\/td>\n<\/tr>\n<tr style=\"height: 13.50pt;\">\n<td style=\"height: 13.50pt;\" height=\"18\"><a href=\"https:\/\/longchangchemical.com\/fr\/product\/photoinitiator-bp-cas-119-61-9\/\"><span style=\"color: #00ccff;\">Photo-initiateur BP \/ Benzoph\u00e9none<\/span><\/a><\/td>\n<td>CAS 119-61-9<\/td>\n<\/tr>\n<tr style=\"height: 13.50pt;\">\n<td style=\"height: 13.50pt;\" height=\"18\"><a href=\"https:\/\/longchangchemical.com\/fr\/product\/photoinitiator-bms\/\"><span style=\"color: #00ccff;\">Photoinitiateur BMS<\/span><\/a><\/td>\n<td>CAS 83846-85-9<\/td>\n<\/tr>\n<tr style=\"height: 13.50pt;\">\n<td style=\"height: 13.50pt;\" height=\"18\"><a href=\"https:\/\/longchangchemical.com\/fr\/product\/photoinitiator-938\/\"><span style=\"color: #00ccff;\">Photoinitiateur 938<\/span><\/a><\/td>\n<td>CAS 61358-25-6<\/td>\n<\/tr>\n<tr style=\"height: 13.50pt;\">\n<td style=\"height: 13.50pt;\" height=\"18\"><a href=\"https:\/\/longchangchemical.com\/fr\/product\/photoinitiator-937-cas-71786-70-4\/\"><span style=\"color: #00ccff;\">Photoinitiateur 937<\/span><\/a><\/td>\n<td>CAS 71786-70-4<\/td>\n<\/tr>\n<tr style=\"height: 13.50pt;\">\n<td style=\"height: 13.50pt;\" height=\"18\"><a href=\"https:\/\/longchangchemical.com\/fr\/product\/photoinitiator-819-dw\/\"><span style=\"color: #00ccff;\">Photo-initiateur 819 DW<\/span><\/a><\/td>\n<td>CAS 162881-26-7<\/td>\n<\/tr>\n<tr style=\"height: 13.50pt;\">\n<td style=\"height: 13.50pt;\" height=\"18\"><a href=\"https:\/\/longchangchemical.com\/fr\/product\/photoinitiator-819-irgacure-819-cas-162881-26-7\/\"><span style=\"color: #00ccff;\">Photoinitiateur 819<\/span><\/a><\/td>\n<td>CAS 162881-26-7<\/td>\n<\/tr>\n<tr style=\"height: 13.50pt;\">\n<td style=\"height: 13.50pt;\" height=\"18\"><a href=\"https:\/\/longchangchemical.com\/fr\/product\/photoinitiator-784-cas-125051-32-3\/\"><span style=\"color: #00ccff;\">Photoinitiateur 784<\/span><\/a><\/td>\n<td>CAS 125051-32-3<\/td>\n<\/tr>\n<tr style=\"height: 13.50pt;\">\n<td style=\"height: 13.50pt;\" height=\"18\"><a href=\"https:\/\/longchangchemical.com\/fr\/product\/photoinitiator-754-cas-211510-16-6-442536-99-4\/\"><span style=\"color: #00ccff;\">Photoinitiateur 754<\/span><\/a><\/td>\n<td>CAS 211510-16-6 442536-99-4<\/td>\n<\/tr>\n<tr style=\"height: 13.50pt;\">\n<td style=\"height: 13.50pt;\" height=\"18\"><a href=\"https:\/\/longchangchemical.com\/fr\/product\/photoinitiator-6993-cas-71449-78-0\/\"><span style=\"color: #00ccff;\">Photoinitiateur 6993<\/span><\/a><\/td>\n<td>CAS 71449-78-0<\/td>\n<\/tr>\n<tr style=\"height: 13.50pt;\">\n<td style=\"height: 13.50pt;\" height=\"18\"><a href=\"https:\/\/longchangchemical.com\/fr\/product\/photoinitiator-6976\/\"><span style=\"color: #00ccff;\">Photoinitiateur 6976<\/span><\/a><\/td>\n<td>CAS 71449-78-0 89452-37-9 108-32-7<\/td>\n<\/tr>\n<tr style=\"height: 13.50pt;\">\n<td style=\"height: 13.50pt;\" height=\"18\"><a href=\"https:\/\/longchangchemical.com\/fr\/product\/photoinitiator-379-cas-119344-86-4\/\"><span style=\"color: #00ccff;\">Photoinitiateur 379<\/span><\/a><\/td>\n<td>CAS 119344-86-4<\/td>\n<\/tr>\n<tr style=\"height: 13.50pt;\">\n<td style=\"height: 13.50pt;\" height=\"18\"><a href=\"https:\/\/longchangchemical.com\/fr\/product\/photoinitiator-369-cas-119313-12-1\/\"><span style=\"color: #00ccff;\">Photoinitiateur 369<\/span><\/a><\/td>\n<td>CAS 119313-12-1<\/td>\n<\/tr>\n<tr style=\"height: 13.50pt;\">\n<td style=\"height: 13.50pt;\" height=\"18\"><span style=\"color: #00ccff;\"><a style=\"color: #00ccff;\" href=\"https:\/\/longchangchemical.com\/fr\/product\/photoinitiator-160\/\">Photoinitiateur 160<\/a><\/span><\/td>\n<td>CAS 71868-15-0<\/td>\n<\/tr>\n<tr style=\"height: 13.50pt;\">\n<td style=\"height: 13.50pt;\" height=\"18\"><a href=\"https:\/\/longchangchemical.com\/fr\/product\/photoinitiator-1206\/\"><span style=\"color: #00ccff;\">Photoinitiateur 1206<\/span><\/a><\/td>\n<td><\/td>\n<\/tr>\n<tr style=\"height: 13.50pt;\">\n<td style=\"height: 13.50pt;\" height=\"18\"><a href=\"https:\/\/longchangchemical.com\/fr\/product\/irgacure-1173-cas-7473-98-5\/\"><span style=\"color: #00ccff;\">Photoinitiateur 1173<\/span><\/a><\/td>\n<td>CAS 7473-98-5<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>&nbsp;<\/p>","protected":false},"excerpt":{"rendered":"<p>With the development of national dual carbon goals, green building materials, photovoltaic roofing and other related fields have received widespread attention from practitioners. Photovoltaic building integration is a solar photovoltaic<\/p>","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[114],"tags":[],"class_list":["post-5374","post","type-post","status-publish","format-standard","hentry","category-catalysts-chemical-auxiliary-agents"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v25.3.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>What are the performance advantages of TPO waterproofing roll-roofing material? - Longchang Chemical<\/title>\n<meta name=\"description\" content=\"With the development of national dual carbon goals, green building materials, photovoltaic roofing and other related fields have received widespread att...\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/longchangchemical.com\/fr\/what-are-the-performance-advantages-of-tpo-waterproofing-roll-roofing-material\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"What are the performance advantages of TPO waterproofing roll-roofing material? 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