Active zinc oxide can be applied to many industries. Now, what is the sunscreen effect of active zinc oxide in cosmetics?
Active zinc oxide has a peculiar “surface effect” in which sunlight (especially in ultraviolet light) can decompose freely moving negatively charged electrons while leaving positively charged holes. This hole activates oxygen in the air to become active oxygen, is highly chemically active, and reacts with a variety of organic compounds (including organic matter in bacteria), killing most germs and viruses.
Because the wavelength of visible light is 400-700 nm, the nano-sized powder material is transparent to visible light, so that the active zinc oxide can be made into a dispersion, and then added to the daily cosmetics, which can be very good for the skin. Protection.
The ability of the metal oxide powder to shield light is large when the particle diameter is 1/2 of the wavelength of light. Zinc oxide has a strong ability to absorb light throughout the ultraviolet region. Active zinc oxide has a long effective action time, long wavelength band for ultraviolet shielding, shielding for long-wave ultraviolet UVA and medium-wave ultraviolet UVB, and can transmit visible light, and has high chemical stability and thermal stability. Moreover, zinc oxide also has a certain antibacterial deodorizing function.
Basically introduced here, the relevant principles are very clear, then there are no other problems? I am afraid that some people will definitely think about whether active zinc oxide used in cosmetics has side effects on the skin, then this is the relevant standard. Let’s take a look at the relevant standards for active zinc oxide!
For active zinc oxide (VK-JH01), China has taken the lead in setting standards and implemented it in 2004. Its standard number is GB/T19589-2004. The standard divides the product into three categories:
Class 1: Mainly used for medicine, cosmetics, and electricity;
Class 2: mainly used in rubber, plastics, coatings, ceramics, chemical fiber, catalysts;
Category 3: Mainly used for rubber.
The indicator is reflected in two aspects:
1 Characterization of active zinc oxide (VK-JH01) particle properties: particle size, ratio, agglomeration index;
2 Characterization of the chemical constituents of active zinc oxide (VK-JH01): zinc oxide containing mother, lead, manganese, copper, cadmium, mercury, arsenic, 105 volatiles (%), water-soluble matter, hydrochloric acid insoluble matter, burning weight loss.