Cyclohexasiloxane

Benefits
Hair Conditioning

What is Cyclohexasiloxane?

Cyclohexasiloxane is a synthetic cyclic siloxane, a ring-shaped molecule with six silicon-oxygen units each bonded to methyl groups, forming a clear, low-viscosity fluid. Produced through hydrolysis and polymerization of dimethyldichlorosilane, it belongs to the volatile methylsiloxane family used in rinse-off and leave-on cosmetics like shampoos, conditioners, primers, and deodorants. It functions as a carrier by dissolving lipophilic and some hydrophilic ingredients, temporarily reducing product thickness for easy spreading due to its low surface tension. Upon application, it evaporates rapidly at skin temperature, depositing other components without residue and imparting a velvety, non-tacky finish. This quick-dry property enhances wearability in aerosols and sprays while minimizing transfer.

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

Enhances hair softness, shine, and ease of styling by coating strands lightly.

Provides a smooth, slippery feel on skin, improving product glide and comfort.

Facilitates even distribution of formulas as a versatile dissolving agent.

Who It's For

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

Who May Benefit Who Should Avoid
Users preferring lightweight, quick-absorbing hair and skin products.
People with rare silicone sensitivities causing contact dermatitis.
Individuals with normal to oily skin seeking non-greasy moisture.
Individuals preferring silicone-free formulations.
Those applying spray or mist formats for convenient use.
Users concerned about volatile organic compounds in aerosols.

Safety Notes

  • Rated low concern for health impacts in cosmetic concentrations.
  • Minimal skin absorption due to rapid evaporation.

Frequently Asked Questions about Cyclohexasiloxane

What does cyclohexasiloxane do in products?

It dissolves ingredients, spreads formulas evenly, and evaporates for a silky, dry finish.

Is it safe for daily use?

Yes, considered safe at typical cosmetic levels with low irritation risk.

Does it feel heavy on skin?

No, its volatility ensures a lightweight, non-greasy sensation.