Dimethicone

CAS: 79-81-2

INCI: Dimethicone

Chemical Structure:

• Dimethicone belongs to the silicone family and is a type of polydimethylsiloxane.
• Its chemical structure consists of repeating units of dimethylsiloxane, resulting in a linear polymer.

Physical Form:

• Dimethicone is a clear, colorless, and odorless silicone oil.
• It is available in various viscosities, ranging from thin liquids to thicker, more viscous substances.

Properties:

1. Inert Nature: Dimethicone is chemically inert, meaning it does not react with other ingredients in formulations.
2. Non-Comedogenic: It is non-comedogenic, making it suitable for formulations targeting individuals with acne-prone or sensitive skin.
3. Hydrophobic: Dimethicone is hydrophobic, creating a barrier on the skin that helps to repel water.
4. Heat Resistance: It exhibits high-temperature stability.

Function in Formulations:

1. Emollient: Dimethicone is widely used as an emollient to soften and smooth the skin. It imparts a silky and velvety texture.
2. Occlusive Agent: Its hydrophobic nature makes dimethicone effective as an occlusive agent, forming a protective barrier on the skin to reduce water loss and enhance moisture retention.
3. Conditioning Agent: In hair care products, dimethicone provides conditioning benefits, improving the texture and manageability of hair.
4. Surface Smoothing: Dimethicone contributes to the smoothness of formulations, minimizing the appearance of fine lines and wrinkles.

Common Applications:

• Dimethicone is a versatile ingredient found in a wide range of personal care and cosmetic products, including moisturizers, lotions, creams, sunscreens, hair conditioners, and makeup products.

Benefits:

1. Hydration: Dimethicone helps to lock in moisture, preventing dehydration and promoting skin hydration.
2. Texture Improvement: It enhances the spreadability and texture of formulations, providing a luxurious feel.
3. Reduced Friction: In skincare and hair care, it reduces friction, making products easier to apply and improving the feel during application.

Considerations:

• While generally well-tolerated, individuals with a history of silicone sensitivity may want to perform patch tests.

Regulatory Status:

• Dimethicone is widely accepted and considered safe for use in cosmetics and personal care products when formulated according to regulatory guidelines.

Certificate of Analysis - Material Safety Data Sheet