CAS No. 63148-62-9Dimethicone in its simplest form is polydimethylsiloxane, also known as silicone oil, but more commonly called dimethicone. Silicone oils are derived from silica (sand and quartz are silicas).
Dimethicone comes in various viscosities, this one is 350 centistokes, a medium viscosity which offers excellent barrier properties when used in skin protectant formulations. It adds slip and glide, reducing tackiness. It offers conditioning properties when used in hair and skin care applications.
Used at a rate of 1% to 30%, dimethicone conforms to the FDA's Tentative Final Monograph on OTC Skin Protectants. However, provided you make no drug claims for it, dimethicone does not have to be declared as an active ingredient, nor does your product or facility need to conform to OTC drug production standards. Dimethicone can be added to any cosmetic and declared on the ingredient label in descending order.
When using dimethicone in cosmetic formulations, one should be guided by the usage rates in the Cosmetic Ingredient Review (CIR) tables (see our Reference Room for links to these PDFs) as these apply to cosmetics rather than OTC products.
The CIR lists Dimethicone in the Cosmetic Ingredients Found Safe as Used in the following amounts:
- Hair Care Preparations - up to 80%
- Makeup - up to 24%
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California Prop 65 Statement: The following statement is made in order to comply with the California Safe Drinking Water and Toxic Enforcement Act of 1986. This product is not known to the State of California to cause cancer, birth defects or other reproductive harm. Please refer to Section 15 of the SDS for the most current information.
Typical Usage Rates: 0.5 - 5.0%, up to 80%
Appearance: Clear viscous liquid
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