When silicones were first offered as ingredients for cosmetic products they were the inert dimethicones or so called silicone oils. Their principal function was as replacement materials for hydrocarbon oils and for imparting water resistance to barrier creams. Their molecular weight is controlled by the number of O-Si groups in the molecule, and their viscosity ranges from 0.65cst to 1,000,000cst.The higher molecular weight dimethicones are often mixed with cyclomethicones to form so called silicone gums, which have wide applications in hair care.
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