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C24-28 ALKYL DIMETHICONE.

Valuable CAS 192230-29-8 / SKIN CONDITIONING, VISCOSITY CONTROLLING

A sophisticated wax-like silicone polymer that balances the light, silky feel of dimethicone with the protective properties of long-chain hydrocarbons. It acts as a high-performance structural agent and moisture sealant, particularly valued in long-wear and anhydrous formulations.

Occlusive emollient Viscosity regulator Film former Compatibility coupler

Science

By combining a high-molecular-weight silicone backbone with long-chain alkyl groups (C24-28), this ingredient creates a breathable yet substantive hydrophobic film. This barrier significantly reduces transepidermal water loss (TEWL) and functions as a molecular bridge, allowing organic oils and silicones to blend harmoniously for a uniform skin finish.


Research

High confidence
Effective range 2–15%
Optimal

5%

Key findings

  1. 01 Safety assessments confirm its use as a standard conditioning agent in suncare and lip products at concentrations up to 2%.
  2. 02 CIR data establishes systemic safety for concentrations up to 15% when utilized as a skin-conditioning and occlusive agent.

Transparency

Not commonly dusted
Min. effective
2%
Red flag below
0.5%

While often used for texture at lower levels, therapeutic occlusive benefits and formula stability typically require at least 2%. Concentrations below 0.5% in heavy creams are likely for label claims rather than structural integrity.


The Formula

Solubility
Oil
Optimal pH 3 – 10
0 7 14

Stability

Highly thermally stable up to 80°C with a specific melting point range of 65-75°C, making it ideal for stick formulations and stable emulsions.

Synergies

  • Organic botanical oils
  • Cyclic siloxanes
  • Mineral UV filters

Conflicts

  • Pure water phases
  • Isopropanol

Safety

CIR Status
Safe as used
Max tested
15%
Pregnancy
Safe
Sensitization risk Low

Due to its large molecular size, dermal penetration is negligible. Our standards require high-purity grades to ensure residual cyclic siloxanes remain below 0.01%.


Your Skin

Yes Normal
Yes Dry
Yes Oily
Yes Sensitive
Irritancy Low
Comedogenicity Low

Our Assessment

Valuable

An essential textural architect that provides superior moisture retention and formula stability without the typical greasiness of heavy waxes.


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