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如何判断防晒化妆品的效果？这两个指标很重要！

作者：管理员
文章来源：管理员
点击次数：1242
更新日期：2021-02-23

[摘要]

防晒类化妆品的两个重要指标是

SPF值和PA等级

什么是SPF值？

SPF是防晒指数Sun Protection Factor的缩写，以具体数值表示产品防御中波紫外线的能力，是评价防晒化妆品保护皮肤避免发生日晒红斑/晒伤能力的防护指标。

SPF值越大，产品防日晒红斑/晒伤的效果越好。例如，如果在某强度的阳光下暴露30分钟会引起皮肤晒伤，那么正确足量（2mg/cm2）涂抹SPF15的防晒霜，可将晒伤时间延长至15×30分钟= 450分钟。

我国化妆品相关法规要求，SPF标识以产品实际测定的SPF值为依据，根据防晒能力可标注范围为SPF2~50+，当产品实测SPF值大于50时，可标识为SPF50+。

什么是PA值？

PA是Protection Grade of UVA的缩写，以“+”表示产品防御长波紫外线的能力。PA等级是根据防晒化妆品长波紫外线防护指数（Protection Factor of UVA，PFA）确定的，反映产品对长波紫外线晒黑的防护效果，是评价防晒化妆品防止皮肤晒黑能力的防护指标。

PA等级越高，防止皮肤晒黑效果越好。如PFA值为4，表示正确足量（2mg/cm2）使用产品时，可以防御长波紫外线延缓皮肤晒黑时间4倍。例如，如果在某强度的阳光下暴露1个小时会引起皮肤晒黑，那么使用PFA值为4的防晒霜可将晒黑时间延长至4个小时。

我国化妆品相关法规要求，PA标识以产品实际测定的PFA值为依据，根据防晒能力可标注范围为PA+~PA++++。

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[ SQL ] SELECT * FROM `bmkj_field` WHERE `lang` = 'cn' [ RunTime:0.002420s ]
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[ SQL ] SHOW COLUMNS FROM `bmkj_ad` [ RunTime:0.002707s ]
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如何判断防晒化妆品的效果？这两个指标很重要！