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What is hydrated silica and how is it made?


What is hydrated silica?

Hydrated silica is naturally derived from silica (silicon dioxide), an abundant compound that forms about 12% of the earth's surface.


How is it made?

Silica is crystalline as it occurs in nature. Sand and obsidian are common forms. The sand is heated with sodium carbonate and dissolved in water to form liquid sodium silicate. The liquid sodium silicate is mixed with acid and precipitated to make hydrated silica, which is an odorless, tasteless white powder. The hydrated silica is then milled in the United States, and based on the particle size of the material can be used for a variety of different applications.


Is it safe?

Hydrated silica has a long history of safe use as an ingredient in food products. It is listed by the U.S. Food & Drug Administration (FDA) to be Generally Recognized As Safe (GRAS).


How is it used?

Our hydrated silica is chemically inert and used as part of our non-toxic natural flame retardant system in our Avocado Vegan Mattress.

Source: Tom's of Maine

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