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AMINOPROPYL TRIETHOXYSILANE.

Valuable CAS 919-30-2 / SURFACTANT - CLEANSING

Aminopropyl Triethoxysilane (APTES) is a versatile silane acting as a texture enhancer and surface modifier in skincare. It improves ingredient spreadability and enhances product adhesion to skin or hair surfaces.

Summary

surfactant cleansing texture enhancer surface modifier

Science

Mechanism of Action

APTES functions as a coupling agent, forming silanol networks that bind to inorganic surfaces or crosslink with polymers. This creates stable film-forming structures, improving ingredient dispersion and product adherence.

Research

Clinical Evidence

High confidence
Effective range 0.1–5%
Optimal

N/A

Key findings

  1. 01 L'Oreal clinical patents demonstrate its use in hair care to increase hair diameter and provide fiber reconstruction.
  2. 02 Technical data indicates its role in improving UV filter dispersion and stability, enhancing SPF performance.

Transparency

Dusting Analysis

Not commonly dusted

No specific data regarding dusting behavior or thresholds for Aminopropyl Triethoxysilane is available.

The Formula

Formulation

Solubility
Water
Optimal pH 7 – 9
0 7 14

Stability

Hydrolytically unstable, it reacts with water and moisture to liberate ethanol. Optimal stability is around pH 7.0, rapidly degrading below pH 4 and above pH 10.

Conflicts

  • Acids
  • Strong oxidizing agents
  • Moisture (during storage)
  • Alcohols (under certain reactive conditions)

Safety

Safety Profile

CIR Status
Safe as used
Max tested
2.6%
Sensitization risk Low

While pure APTES is corrosive, concentrations typically below 1% in cosmetics are non-irritating. The CIR Expert Panel concluded related silanes are safe at current use levels.

Your Skin

Skin Compatibility

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

Our Assessment

Verdict

Valuable

Aminopropyl Triethoxysilane is a valuable ingredient for enhancing product texture, improving ingredient dispersion, and boosting product longevity on skin or hair surfaces.

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