防晒产品大攻略 教你“看透”SPF和PA值!
\n
\n","userid":"wuyanli","media_url":"#","source_url":"http://jiankang.163.com","topicid":"00388049","stitle":"VDPJSQAD8","boardid":"jiankang_bbs","replaceKeywordCount":5,"mtitle":null,"processPageData":"true","#":"http://jiankang.163.com","duty_editor":"吴延丽_NBJS6202","modelid":"0038gongkaike_mb","author":"","info3g":null,"adstr":"[an error occurred while processing the directive]","iscomment":"y","quality":90,"otitle":"","status":0,"hismod":false,"originalflag":0,"postid":"DQI43KIU00388049","title":"防晒产品大攻略 教你“看透”SPF和PA值!","pcommentid":null,"newsid":null,"nickname":"吴延丽","digest":"","navtopicid":null,"statement":"本文系网易原创稿件,版权属网易所有,未经授权不得转载,已经协议授权的媒体下载使用时须注明稿件来源:网易,违者将依法追究责任。","commentid":"DQI43KIU00388049","exe_editor":"王晓易_NE0011","hasad":false,"ptime":1535702179000,"setAdstr":false,"userinfo":null,"view_name":"网易健康","createtime":1535702179000,"source_city":"北京","statementtype":0,"docid":"DQI43KIU00388049","dkeys":"防晒,防晒品,spf,pa,红斑","hideAd":false,"url":"https://jiankang.163.com/18/0831/15/DQI43KIU00388049.html","realname":null,"relatekey":"","buloid":"","sdigest":null,"photosetCovers":"","cnavbar":null,"channelConfigId":"0038","channelConfigName":"网易健康","channelConfigUrl":"http://jiankang.163.com/","channelConfigPathName":"健康频道","channelConfigHomeName":"健康首页","channelConfigPath2Name":"正文","channelConfigUrl2":"javascript:;\" target=\"_self","channelConfigLogo":"http://static.ws.126.net/f2e/health/post1301_ad/images/logo_health.png","channelConfigEndicon":"http://static.ws.126.net/f2e/health/post1301_ad/images/end_health.png"} -->
分享到
公开课模版测试文章(编辑别推)

李承新

中国人民解放军总医院皮肤科主任医师

防晒产品上的SPF和PA分别指什么?
SPF指的是防晒指数(Sun Protection Factor),是指在涂有防晒品的皮肤上产生最小红斑所需能量,与未加任何防护的皮肤上产生相同程度红斑所需能量的比值。
假设紫外线的强度不会因时间改变,一个没有任何防晒措施的人待在阳光下10分钟后皮肤会变红,当他采用SPF15的防晒品时,表示可延长15倍的时间,也就是在150分钟后皮肤才会被晒红。此时SPF值就是150除以10得到的,意味着这个防晒品会给我们的皮肤提供延长15倍的防护。

防晒产品大攻略 教你“看透”SPF和PA值!

PA指的是对UVA的防御能力,并以+、++、+++三种强度来标示,“+”越多,防御UVA的效果就越好。即使在阴天、下雨的天气UVA也会存在,所以我们在选择防晒产品时,不仅要选择具有SPF防护能力标识的,还要选择有PA防护能力标识的,以真正达到防护的效果。
更多相关视频:
你不知道的肤色“内幕” 黑种人不易患皮肤癌?
夏日难题!为什么太阳光能把人的皮肤晒黑?
##文末来源+编辑署名

吴延丽 本文来源:网易健康 责任编辑:吴延丽_NBJS6202

小编推荐