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What does uncoated zinc oxide mean?

Number of visits: Date:2011-08-08 14:20
Many sunscreens use zinc oxide whose particles have been coated with an inert substance. The reasons for coating are usually to make small nanoparticles less reactive and to make them easier to mix with the base ingredients. Badger used coated zinc oxide for years, until we switched to using larger particles (which are less reactive than smaller particles) and we found a better way to mix uncoated zinc oxide into our base. The zinc oxide we now use in all our sunscreens is uncoated pharmaceutical grade zinc oxide, the same kind used in calamine lotion and diaper rash cream. We know that uncoated zinc oxide is somewhat more photoreactive than coated zinc oxide, but we belive that this is not a health risk. Read details in the next section.

TypeInfo: Technical exchange

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