![]() Further, they are nontoxic, inert, stable, and water They have an extremely low surface tension and penetrate crevices in the skin toįorm a plastic-like barrier. Silicone (dimethicone) ointments are excellent water-protective agents because UsesĪ silicone oil consisting of a mixture of fully methylated linear siloxane polymers end-blocking with trimethylsiloxy units. In combination with other ingredients, dimethicone becomes a good waterproofing material for sunscreen emulsions, and helps reduce the greasiness often seen in high-SPF preparations. It improves product flow and spreadability. In addition, dimethicone is reported to protect the skin against moisture loss when used in larger quantities. It can also serve as a formulation defoamer and help reduce the feeling of greasiness that some creams leave on the skin immediately upon application. Usesĭimethicone is a form of silicone used to give products lubricity, slip, and good feel. Dimethicone are safe as used in cosmetic formulations, vulcanization. Methicone is a linear monomethyl polysiloxane. Dimethicone is a fluid mixture of fully methylated linear siloxane polymers end-blocked with trimethylsiloxy units. Oral, inhalation and skin contact have no obvious irritation or allergic reaction to the eyes, skin, and can’t be absorbed by the gastrointestinal tract and skin.Ĭolourless to slightly yellow liquid Chemical Propertiesĭimethicones are clear, colorless liquids available in various viscosities. It has no obvious acute and chronic poisoning reaction to human beings and mammals, nor be mutagenic and carcinogenic. It is produced by the reaction between octamethylcyclotetrasiloxane and hexamethyldisiloxane in the presence of concentrated sulfuric acid or tetramethylammonium hydroxide catalyst. Widely used in insulation, heat, moisture-proof filler, defoamer, mold release agent, lubricant and surface treatment agent. It has excellent hydrophobic moisture resistance, good light transmission, and chemical stability. It is soluble in benzene, toluene, xylene and ethyl ether, partially soluble in ethanol, butanol and acetone, insoluble in cyclohexanol, methanol, paraffin oil and vegetable oil. Breakdown voltage strength: 13.7 ~ 17.7kV / mm. In isolated air or inert gas, it can be subject to long-term use at 200 ℃. Long-term use temperature range is -50 ~ 180 ℃. Based on the differences on the molecular weight, kinematic viscosity varies from 1.0 × 10-6 ~ 100000 × 10-6 square meters / second. The average molecular weight is 5000 ~ 100000. The molecular formula is CH3 nSi (CH3) 3. It appears as colorless transparent viscous liquid, being tasteless, odorless and non-toxic. Dimethyl silicone is also known as methyl silicone oil and polydimethylsiloxane liquid.
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