CAS Number: 556-67-2

Description: Cyclotetrasiloxane, also known by its chemical name CAS no. 556-67-2, is an essential ingredient used in cosmetics, primarily as a silicone-based compound. This colorless and odorless liquid is valued for its unique properties in the cosmetics industry.

Other Names: Cyclotetrasiloxane may also be referred to by other names, including:

  • Octamethylcyclotetrasiloxane
  • D4
  • Cyclotetrasiloxane (INCI name)

Uses in Cosmetics: Cyclotetrasiloxane is widely used in cosmetics for its exceptional properties. It serves as a carrier and solvent for a variety of cosmetic ingredients, helping to enhance the texture and feel of products. In skincare and haircare formulations, it contributes to a silky, smooth texture, making products easier to apply and ensuring even distribution. Cyclotetrasiloxane is commonly found in products such as moisturizers, serums, hair conditioners, and foundations.

Skin Sensitivities: Cyclotetrasiloxane is generally considered safe for use in cosmetics and skincare products. It is well-tolerated by most individuals and does not typically cause skin sensitivities. However, it's essential to remember that everyone's skin is unique, and some individuals with extremely sensitive skin may experience mild irritation or sensitivity to silicone-based ingredients. If you have a known sensitivity to silicones, it's advisable to perform a patch test or consult with a dermatologist before using products containing Cyclotetrasiloxane.

Risks and Bans: As of January 1, 2027, Cyclotetrasiloxane is not among the banned ingredients for cosmetics in California. However, it's crucial to stay informed about ingredient regulations, as they can change over time. Cyclotetrasiloxane is widely accepted in the cosmetics industry due to its safety profile and beneficial properties.

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