commercially available cosmetic grade silica is generally spherical silica, most of which are made into 2 to 15
some μm-sized hollow microbeads have a porous surface, which has good adsorption and lubricity, and absorbs both oil and water. some silicas are surface-treated with silicone oil, which makes them waterproof and has better compatibility with grease and oil. it is easy to add to w/o’s base makeup formula; due to its high hardness, silica can also give the product excellent pressure resistance.
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