Octamethylcyclotetrasiloxane

Octamethylcyclotetrasiloxane (often abbreviated as OMCTS or D4) is a type of siloxane, a class of chemical compounds containing silicon, oxygen, and carbon. It is a colorless, odorless liquid used in a variety of applications, including cosmetics, pharmaceuticals, and industrial lubricants.

Structure and Properties

Octamethylcyclotetrasiloxane is a cyclic compound, meaning its molecules form a closed loop. It consists of four silicon atoms and four oxygen atoms arranged in a ring, with two methyl groups attached to each silicon atom. This structure gives it unique properties, such as low viscosity, high thermal stability, and the ability to form a water repellent layer on surfaces.

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Structure of Octamethylcyclotetrasiloxane

Uses

Due to its unique properties, octamethylcyclotetrasiloxane is used in a wide range of applications. In the cosmetics industry, it is used as an ingredient in products such as deodorants, shampoos, and skin care products. In the pharmaceutical industry, it is used as a carrier in transdermal drug delivery systems. In the industrial sector, it is used as a lubricant and as a component in silicone rubber and silicone resin.

Safety and Environmental Impact

Octamethylcyclotetrasiloxane is generally considered safe for use in cosmetics and pharmaceuticals. However, some studies have suggested that it may have potential endocrine disrupting effects. It is also persistent in the environment and has been detected in air, water, and soil samples. Therefore, its use and disposal are subject to regulations in many countries.

See Also

• Siloxane
• Silicone
• Endocrine disruptor