Zinc oxide is an inorganic compound with the chemical formula ZnO. It is a white or yellowish-white powder at room temperature, nearly insoluble in water, but soluble in acids or alkalis [1]. Zinc oxide is a wide-bandgap semiconductor, finding applications in various fields such as rubber, plastic, ceramic, glass, cement, lubricant, pharmaceutical, adhesive, sealant, pigment, food, battery, ferrite, fire retardant, and first-aid tape [2].

Zinc oxide is generally produced through three primary methods: the direct process (American process), the indirect process (French process), and the wet process [3]. The direct method involves reducing zinc-containing materials, such as zinc ore, with carbon at high temperatures, followed by oxidation of the vaporized zinc to produce zinc oxide [4]. The indirect method involves vaporizing metallic zinc, which is then reacted with oxygen to form zinc oxide [5]. The wet process involves precipitating zinc oxide from aqueous solutions, often followed by calcination to obtain the final product [6]. Each of these methods affects the properties of the zinc oxide, such as particle size, morphology, and purity, which determines its suitability for different applications [7].

Zinc oxide exhibits several functions and effects, making it useful across various industries. It acts as a UV filter in sunscreens and cosmetics, protecting the skin from harmful UV rays [8]. As a key ingredient in rubber manufacturing, it enhances the rubber's strength and elasticity [9]. In the medical field, zinc oxide is used in ointments and creams to treat skin irritations, burns, and wounds due to its antiseptic and astringent properties [10]. Additionally, it is a nutrient additive in animal feed and fertilizers [11].

The application scenarios for zinc oxide are extensive, reflecting its versatile properties. In the realm of personal care, it is a common component in sunscreens, lotions, and makeup [12]. Within the rubber industry, it serves as an activator in the vulcanization process, improving the durability and resilience of rubber products [13]. In agriculture, zinc oxide is used as a fertilizer to supply essential zinc to crops, promoting healthy plant growth [14]. Moreover, it is utilized in the manufacturing of paints and coatings, providing opacity and protection against corrosion [15].

Zinc oxide should be packaged in airtight containers to prevent moisture absorption and contamination. It is advisable to store it in a cool, dry, and well-ventilated area, away from direct sunlight and high humidity [16]. Proper storage conditions help maintain its stability and prevent agglomeration, ensuring its quality and effectiveness over its shelf life. Typically, zinc oxide can be stored for up to 24 months under optimal conditions [17].

Citations:
[1]https://pubchem.ncbi.nlm.nih.gov/compound/Zinc-oxide
[2]https://www.sciencedirect.com/topics/materials-science/zinc-oxide
[3]https://www.ami-us.com/zinc-oxide-manufacturing-process/
[4]https://www.thoughtco.com/zinc-oxide-properties-uses-606675
[5]https://www.indzinc.com/blog/a-look-into-the-manufacturing-process-of-zinc-oxide
[6]https://www.sigmaaldrich.com/technical-documents/article/materials-science/nanomaterials/zinc-oxide-nanoparticles
[7]https://www.azonano.com/article.aspx?ArticleID=4645
[8]https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3401665/
[9]https://rubberchemreview.com/2017/03/06/role-zinc-oxide-rubber-compound/
[10]https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4142891/
[11]https://www.feedipedia.org/node/671
[12]https://thedermreview.com/zinc-oxide/
[13]https://polymerdatabase.com/additives/activators.html
[14]https://www.researchgate.net/publication/343709558_Zinc_oxide_a_versatile_nano-fertilizer_for_balanced_crop_nutrition
[15]https://www.paintsquare.com/article/?fuseaction=view&id=18883
[16]https://www.cameochemicals.noaa.gov/chemical/6079
[17]https://www.ulprospector.com/en/na/PersonalCare/Detail/517/77971/Zinc-Oxide

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