{"id":6306,"date":"2023-11-24T07:30:42","date_gmt":"2023-11-24T07:30:42","guid":{"rendered":"https:\/\/longchangchemical.com\/?p=6306"},"modified":"2026-04-28T10:42:22","modified_gmt":"2026-04-28T10:42:22","slug":"does-a-higher-spf-mean-better-results","status":"publish","type":"post","link":"https:\/\/longchangchemical.com\/fr\/does-a-higher-spf-mean-better-results\/","title":{"rendered":"Que signifie le FPS dans les produits de protection solaire et un FPS \u00e9lev\u00e9 est-il synonyme de meilleurs r\u00e9sultats ?"},"content":{"rendered":"<h1><strong>Que signifie le FPS dans les produits de protection solaire et un FPS \u00e9lev\u00e9 est-il synonyme de meilleurs r\u00e9sultats ?<\/strong><\/h1>\n<p><!-- lc-qa-start --><\/p>\n<p><strong>Quick answer:<\/strong> UV ink systems are usually judged by cure speed, print definition, substrate adhesion, and whether the final image survives real handling. The best package is the one that performs on the press, not just in a static lab test.<\/p>\n<p><!-- lc-qa-end --><\/p>\n<p>1. Les UVB et les UVA ont des effets diff\u00e9rents sur la peau.<\/p>\n<p>Les UVB ont une longueur d'onde plus courte (290-320 nm) et une \u00e9nergie plus forte, ce qui peut faire rougir la peau et provoquer des coups de soleil en peu de temps. Cependant, la p\u00e9n\u00e9tration des UVB est plus faible, de sorte que la plupart des UVB contenus dans la lumi\u00e8re du soleil sont bloqu\u00e9s par la couche d'ozone et que seule une petite partie atteint la surface de la terre. Les UVB peuvent provoquer un cancer de la peau en cas d'exposition prolong\u00e9e.<br \/>\nEn revanche, les UVA ont une longueur d'onde plus grande (320-400 nm) et une \u00e9nergie plus faible, mais ils sont si p\u00e9n\u00e9trants qu'ils peuvent atteindre la surface de la terre tout au long de l'ann\u00e9e, qu'il y ait du soleil ou des nuages, et m\u00eame irradier la couche dermique de notre peau. \u00c0 court terme, les UVA peuvent provoquer une sensibilit\u00e9 de la peau et une diminution de la tol\u00e9rance, et \u00e0 long terme, ils peuvent provoquer un d\u00e9p\u00f4t de m\u00e9lanine et acc\u00e9l\u00e9rer le vieillissement de la peau, ce qui signifie que les UVA peuvent rendre notre peau plus fonc\u00e9e et rid\u00e9e. En outre, les UVA peuvent \u00e9galement provoquer un cancer de la peau.<\/p>\n<p>Par cons\u00e9quent, lorsque nous choisissons un \u00e9cran solaire, la protection contre les UVA et les UVB est importante. Par temps nuageux, les gens ont tendance \u00e0 n\u00e9gliger l'utilisation de la cr\u00e8me solaire, mais les UVA peuvent tout aussi bien p\u00e9n\u00e9trer dans la couche dermique de la peau. Nous avons besoin d'une protection solaire tout au long de l'ann\u00e9e, la plus facilement ignor\u00e9e, et la n\u00e9cessit\u00e9 optimale de protection tout au long de l'ann\u00e9e est l'UVA.<\/p>\n<p>Actuellement, de nombreux \u00e9crans solaires prot\u00e8gent mieux contre les UVB que contre les UVA.<\/p>\n<p>2. L'importance des valeurs SPF et PA<\/p>\n<p>FPS : capacit\u00e9 d'un produit solaire \u00e0 prot\u00e9ger contre les rayons UVB qui peuvent br\u00fbler la peau. Par exemple, un flacon de cr\u00e8me solaire avec un FPS de 20 signifie qu'il multiplie par 20 la tol\u00e9rance de votre peau aux rayons UVB lorsqu'il est appliqu\u00e9. En supposant que votre peau rougisse apr\u00e8s 10 minutes d'exposition au soleil sans cr\u00e8me solaire, il vous faudra environ 15*20=200 minutes d'exposition au soleil apr\u00e8s l'application d'une cr\u00e8me solaire avec un FPS de 20 pour rougir.<\/p>\n<p>De nombreuses personnes pensent \u00e0 tort que le FPS fait r\u00e9f\u00e9rence \u00e0 la dur\u00e9e de la protection solaire continue. Par exemple, un FPS 50 peut offrir une protection pendant plus de trois fois la dur\u00e9e d'une cr\u00e8me solaire FPS 15. Une telle compr\u00e9hension est erron\u00e9e. En fait, le FPS n'est pas directement li\u00e9 au temps pass\u00e9 au soleil, mais plut\u00f4t \u00e0 l'intensit\u00e9 de l'exposition \u00e0 la lumi\u00e8re. \u00c0 la mi-journ\u00e9e, lorsque le soleil est fort, vous risquez davantage d'attraper un coup de soleil que le matin ou le soir, et \u00e0 des latitudes plus basses (comme \u00e0 Guangzhou ou au Xinjiang), o\u00f9 l'intensit\u00e9 du soleil est \u00e9galement plus forte, vous devrez peut-\u00eatre renouveler l'application de la cr\u00e8me solaire plus souvent.<\/p>\n<p>PA (protection grade of UVA) est la capacit\u00e9 \u00e0 combattre les UVA, suivie du signe +, indiquant une plus grande capacit\u00e9 \u00e0 pr\u00e9venir le bronzage. Mais tous les produits ne portent pas la marque PA, de nombreuses cr\u00e8mes solaires europ\u00e9ennes et am\u00e9ricaines ne portent pas la marque PA, ce qui ne signifie pas qu'elles ne veulent pas bronzer, mais qu'elles utilisent simplement d'autres m\u00e9thodes d'\u00e9tiquetage, telles que le coefficient d'hyperpigmentation persistante (PPD).<\/p>\n<p>Diff\u00e9rences entre les indices SPF des cr\u00e8mes solaires (par exemple, SPF20, SPF30, SPF50) :<\/p>\n<p>SPF20 :<\/p>\n<p>Offre une protection mod\u00e9r\u00e9e contre les rayons UVB.<br \/>\nBloque environ 95% des rayons UVB.<br \/>\nConvient aux activit\u00e9s quotidiennes avec une exposition limit\u00e9e au soleil.<br \/>\nSPF30 :<\/p>\n<p>Offre une protection plus \u00e9lev\u00e9e que le SPF20.<br \/>\nBloque environ 97% des rayons UVB.<br \/>\nRecommand\u00e9 pour les activit\u00e9s ext\u00e9rieures prolong\u00e9es.<br \/>\nSPF50 :<\/p>\n<p>Offre le plus haut niveau de protection contre les UVB.<br \/>\nBloque environ 98% des rayons UVB.<br \/>\nRecommand\u00e9 pour les personnes ayant une peau claire ou sensible, une exposition prolong\u00e9e au soleil ou un risque \u00e9lev\u00e9 de cancer de la peau.<br \/>\nPoints cl\u00e9s :<\/p>\n<p>Protection progressive : La diff\u00e9rence de protection entre les indices SPF n'est pas lin\u00e9aire. Par exemple, le SPF 30 n'offre pas une protection double de celle du SPF 15. Le SPF 30 offre une protection sup\u00e9rieure d'environ 4% \u00e0 celle du SPF 15, et le SPF 50 n'offre qu'une protection sup\u00e9rieure d'environ 1-2% \u00e0 celle du SPF 30.<\/p>\n<p>Protection contre les UVB : Le SPF mesure principalement la protection contre les rayons UVB, responsables des coups de soleil. Il n'offre pas une protection compl\u00e8te contre les rayons UVA, qui contribuent au vieillissement pr\u00e9matur\u00e9 et au cancer de la peau.<\/p>\n<p>R\u00e9application : Quel que soit le niveau de FPS, il est essentiel de renouveler l'application de la cr\u00e8me solaire toutes les deux heures ou plus fr\u00e9quemment si l'on nage ou si l'on transpire. Aucune cr\u00e8me solaire n'offre une protection de 100%, et il est essentiel de renouveler l'application pour maintenir l'efficacit\u00e9 de la protection.<\/p>\n<p>Type de peau : Le choix du FPS peut d\u00e9pendre du type de peau, de la sensibilit\u00e9 au soleil et de la dur\u00e9e de l'exposition. Les personnes \u00e0 la peau claire ou sensible peuvent opter pour des niveaux de FPS plus \u00e9lev\u00e9s.<\/p>\n<p>Envisagez d'autres mesures de protection solaire : La cr\u00e8me solaire doit faire partie d'un plan de protection solaire complet, comprenant la recherche de l'ombre, le port de v\u00eatements de protection et l'\u00e9vitement des heures d'ensoleillement maximal.<\/p>\n<p>Plus le SPF est \u00e9lev\u00e9, mieux c'est ?<\/p>\n<p>Bien qu'il puisse sembler logique qu'un FPS plus \u00e9lev\u00e9 offre une meilleure protection, l'augmentation progressive de la protection diminue au fur et \u00e0 mesure que les niveaux de FPS augmentent. Le SPF 30 est g\u00e9n\u00e9ralement consid\u00e9r\u00e9 comme suffisant pour la plupart des gens, offrant une protection significative contre les rayons UVB. Le SPF 50 offre un niveau de protection l\u00e9g\u00e8rement plus \u00e9lev\u00e9 et peut \u00eatre recommand\u00e9 dans des situations sp\u00e9cifiques, telles que des activit\u00e9s de plein air prolong\u00e9es ou pour des personnes plus sensibles au soleil.<\/p>\n<p>Il est essentiel de noter qu'aucun \u00e9cran solaire n'offre une protection compl\u00e8te et que d'autres mesures de protection solaire doivent \u00eatre prises, en particulier en cas d'ensoleillement intense. En outre, la protection contre les UVA, qui n'est pas indiqu\u00e9e par le FPS, est cruciale pour la protection solaire globale. Recherchez des \u00e9crans solaires \u00e0 large spectre qui prot\u00e8gent \u00e0 la fois contre les UVA et les UVB.<\/p>\n<p>En fin de compte, le choix du bon FPS d\u00e9pend de facteurs individuels tels que le type de peau, la dur\u00e9e pr\u00e9vue de l'exposition au soleil et les pr\u00e9f\u00e9rences personnelles. Il est conseill\u00e9 de consulter un dermatologue pour obtenir des recommandations personnalis\u00e9es en fonction des besoins et des pr\u00e9occupations sp\u00e9cifiques de la peau.<\/p>\n<p><!-- lc-commercial-start --><\/p>\n<h2>A practical buying checklist for UV ink applications<\/h2>\n<p>In UV printing, the best technical choice usually comes from balancing curing performance with print behavior. Teams normally get the strongest result when they review substrate fit, line speed, image quality, and post-cure durability together rather than optimizing only one variable.<\/p>\n<ul>\n<li><strong>Match the package to the printing method:<\/strong> inkjet, gravure, letterpress, pad printing, screen printing, and label applications can need different cure and viscosity profiles.<\/li>\n<li><strong>Check image quality with cure:<\/strong> the strongest initiator or monomer route is not helpful if transfer, dot behavior, or film clarity gets worse.<\/li>\n<li><strong>Review adhesion after full cure:<\/strong> a surface-dry print can still fail later if the deeper film remains under-cured.<\/li>\n<li><strong>Test on the final substrate family:<\/strong> film, metal, glass, paper, and specialty surfaces can shift the commercial ranking of the same package quickly.<\/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\/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\/photoinitiator-itx-cas-5495-84-1\/\">CHLUMINIT ITX<\/a>:<\/strong> A useful long-wave support route in many printing-ink packages.<\/li>\n<li><strong><a href=\"https:\/\/longchangchemical.com\/fr\/product\/iboa-monomer-cas-5888-33-5\/\">CHLUMICRYL IBOA<\/a>:<\/strong> A strong low-viscosity monomer reference when hardness and good flow both matter.<\/li>\n<\/ul>\n<h3>FAQ for buyers and formulators<\/h3>\n<p><strong>Why can a UV ink look fine in a lab drawdown but struggle on press?<\/strong><br \/>Because print speed, real film build, substrate handling, and curing energy often expose limitations that are not visible in a slower or simpler test.<\/p>\n<p><strong>Should UV ink materials be selected only by the fastest cure?<\/strong><br \/>No. Commercial selection also needs to protect print sharpness, adhesion, color, and long-run consistency.<\/p>\n<p><!-- lc-commercial-end --><\/p>","protected":false},"excerpt":{"rendered":"<p>1. UVB and UVA do different damage to the skin UVB has a shorter wavelength (290-320 nm) and stronger energy, which can make our skin red and sunburned in a<\/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-6306","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 does SPF stand for in sunscreen products and does a higher SPF mean better results? - Longchang Chemical<\/title>\n<meta name=\"description\" content=\"1. 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