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CYCLOTETRASILOXANE.

Avoid CAS 556-67-2 / 293-51-6 / HAIR CONDITIONING, SKIN CONDITIONING - EMOLLIENT, SOLVENT

A volatile, cyclic silicone also known as D4, primarily utilized for its ability to provide an ultra-silky, weightless finish to cosmetic formulations. It acts as a temporary skin-smoother and efficient carrier that evaporates shortly after application, leaving no heavy residue.

Emollient Solvent Skin-conditioning agent Hair-conditioning agent

Science

Functions as a solvent and skin-conditioning agent that lowers the surface tension of formulas to enhance spreadability. Upon application, it fills micro-textures and fine lines to create a synthetic, water-repellent film; however, its high volatility ensures it evaporates off the skin surface rather than being absorbed, serving as a delivery vehicle for other active ingredients.


Research

Low confidence
Effective range ≤0.1%
Optimal

N/A


Transparency

Not commonly dusted
Red flag below
0.1%

As a functional solvent rather than a bio-active ingredient, it is not typically 'dusted.' However, it is strictly capped at 0.1% in many regions due to safety and environmental regulations.


The Formula

Solubility
Oil
Optimal pH N/A
0 7 14

Stability

Exhibits high resistance to hydrolysis by water and acids; remains stable under standard cosmetic storage conditions.

Synergies

  • Dimethicone
  • Cyclopentasiloxane
  • Lipophilic active ingredients

Safety

CIR Status
Safe as used
Max tested
0.1%
Pregnancy
Caution
Sensitization risk Low

Classified as a Category 3 reproductive toxin and a suspected endocrine disruptor. It is subject to strict environmental regulations in the EU due to its persistence and bioaccumulation in the ecosystem.


Your Skin

Yes Normal
Yes Dry
No Oily
No Sensitive
Irritancy Unknown
Comedogenicity Moderate

Our Assessment

Avoid

Despite its superior sensory profile, its classification as a reproductive toxin and its negative environmental impact make it an unsuitable choice for precision skincare.


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