存在两种类型的防晒霜。物理和化学防晒霜都是可用的。氧化锌和二氧化钛的物理类型,这意味着防晒霜不是吸收皮肤表面,根据“《纽约时报》。”When applied to the skin, these ingredients reflect light, much like a mirror. Understanding which ingredient is right for you can help to protect you against the sun's harmful effects.
推导
正如它的名字,二氧化钛生产钛。在其自然状态,钛是白垩色,白色和高度反光的,根据“《纽约时报》。”Zinc oxide is derived from the mineral zinc to create a material that is effective at blocking the sun's rays. When applied to the skin, zinc oxide can have a white appearance and also feel slightly heavy on the skin, according to Paula Begoun, an author and speaker known as "The Cosmetics Cop" for her work in evaluating the safety and efficacy of cosmetics.
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大小的防晒霜
二氧化钛和氧化锌都是来源于白垩,反光材料。虽然这是有利于反射太阳光,这些材料的应用可以对皮肤没有吸引力,因为它导致的白色,白垩的外表,根据环境工作小组。出于这个原因,防晒霜制造企业努力降低粒子化学防晒霜。二氧化钛是按比例缩小到10至100纳米(纳米),一个用来测量单元的测量非常小的粒子,而氧化锌是按比例缩小30到200海里。这使得每个特定的皮肤明显减少,但没有那么小,穿透皮肤。
皮肤过敏
二氧化钛是noncomedogenic,意味着它不包含油会堵塞皮肤毛孔,根据“《纽约时报》。”In addition to its sun-fighting properties, zinc oxide is known for its noncomedogenic and antimicrobial properties. This can help to enhance wound healing. However, the heavy or thick nature of the products can sometimes contribute to clogged pores, although this likelihood is smaller than other sunscreen products, such as avobenzone and oxybenzone, according to Begoun.
有效性
在有效性方面,氧化锌/二氧化钛有一个微弱的优势,根据SmartSkinCare。二氧化钛是有效阻止紫外线b和短波ultraviolet-A射线,但它比锌二氧化碳有效阻止长ultraviolet-A射线。氧化锌块不同类型的射线的能力使它的一个最有效的防晒产品市场上对抗太阳光线。然而,氧化锌经常加上额外的紫外线b阻滞剂提供最完整的广谱防晒霜。
注意事项
当试图找到正确的防晒成分,贝岗建议尝试每个成分以确保它不会引起皮肤过敏。如果你的防晒霜是结合基础或其他化妆品,一定要涂上足够的层提供防晒。因为氧化锌提供略好覆盖在太阳的紫外光谱,您可能希望从这个成分,然后切换到二氧化钛如果你发现你不能穿锌二氧化碳。