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On the other hand, the U.S. Food and Drug Administration (FDA) in their Final Administrative Order on Sunscreen Drug Products posted in September 2021 still accepts titanium dioxide up to 25% in the list of Generally Recognized As Safe and Effective (GRASE) in the main document, without further clarification on what kind or size of particles [9]. However, on page 24 (Sunscreen containing nanomaterials) FDA clearly “distinguish nanomaterials from other forms of these ingredients'' (zinc oxide and titanium dioxide) and ask for comments on “any particular nanomaterials that you believe should not be permitted for use in OTC sunscreen products”. To the best of our knowledge, this Agency did not ban the use of nanoparticulate titanium dioxide in any form, even though it is mentioned on page 34 that the anatase form is the more photoactive one, due to the lack of evidence with real sunscreens OTC (over the counter) in vivo. Moreover, other regulations in Latin America (MERCOSUR agreement, 2006) do not state clearly their position on the use of nanoparticulate TiO2NPs [10].

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{随机栏目} 2025-08-14 03:49 2440
  • Despite its intimidating size and noise, the rotary jackhammer is relatively easy to operate
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  • Abstract This article explores the concept of drilling in the context of YT29, a popular drilling technique. We will discuss the origins, techniques, and implications of YT29 drilling, providing a comprehensive analysis of its potential impact on the drilling industry.
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  • One of the key advantages of corrosion-resistant fiberglass is its versatility. It can be molded into complex shapes and sizes, making it suitable for a wide range of applications, from chemical storage tanks to offshore oilrigs. Its lightweight nature, coupled with high strength-to-weight ratio, further enhances its appeal, particularly in weight-sensitive sectors like aerospace and automotive.
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