Cyclotrisiloxane

What is Cyclotrisiloxane?

Cyclotrisiloxane is a synthetic, low-molecular-weight cyclic siloxane oligomer formed from three dimethylsiloxane units, resulting in a clear, colorless, low-viscosity liquid. It belongs to the volatile methylsiloxanes category commonly incorporated into cosmetics such as hair conditioners, styling products, lotions, and deodorants. In formulations, it serves as a carrier that rapidly spreads across surfaces due to its low surface tension, dissolves lipophilic ingredients, and then evaporates cleanly at skin temperature. This process deposits conditioning films without residue, enhancing product slip, manageability, and sensory attributes like softness and shine. Its quick volatilization minimizes transfer concerns while aiding even distribution of actives in both aqueous and anhydrous systems.

Comedogenic Rating 0/5 Low risk of clogging pores
EWG Safety Rating 2 View on EWG →
PubChem View on PubChem →

Roles in Formulation

This ingredient serves the following purposes in cosmetic formulations:

Hair conditioning
Improves softness, shine, and manageability by reducing friction and static; commonly achieved with cationic agents, silicones, oils, or conditioning polymers.
Emollient
Softens and smooths skin by filling in surface roughness and improving slip; can also help reduce moisture loss when paired with occlusives and film formers.
Solvent
Dissolves and carries other ingredients, helping control viscosity, evaporation rate, and delivery of actives in both water- and oil-based systems.
Skin conditioning agent
Maintains skin softness, smoothness, and flexibility.

Benefits

Delivers a lightweight, silky texture to skin and hair by improving spreadability and reducing friction.

Evaporates rapidly to leave a dry, non-tacky finish without heaviness.

Supports even application of other ingredients for better product performance.

Who It's For

A quick guide for who this ingredient may suit (and who should be cautious).

Who May Benefit Who Should Avoid
Individuals with dry or rough skin seeking smoothing effects.
Those with rare silicone sensitivities.
People with unmanageable or static-prone hair.
People opting for silicone-free routines.
Users preferring lightweight formulas with quick absorption.
Individuals sensitive to volatile evaporative compounds.

Safety Notes

  • Rated low hazard by standard cosmetic safety assessments.
  • Non-comedogenic with minimal absorption potential.

Frequently Asked Questions about Cyclotrisiloxane

What does cyclotrisiloxane do in products?

It acts as a solvent to dissolve ingredients, spreads easily, and evaporates for a smooth, dry-touch finish.

Is cyclotrisiloxane safe for skin?

Yes, it's considered safe in cosmetics with low irritation and comedogenic potential.

Does it benefit hair care?

It improves softness, shine, and manageability by reducing friction during styling.