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ALUMINUM STARCH OCTENYLSUCCINATE.

Valuable CAS 9087-61-0 / ABSORBENT, ANTICAKING, VISCOSITY CONTROLLING

A modified starch derivative, Aluminum Starch Octenylsuccinate is a versatile cosmetic ingredient primarily valued for its oil-absorbing and texture-enhancing properties, delivering a matte finish.

absorbent viscosity controlling anti-caking texture modifier

Science

Its hydrophobic octenylsuccinate chains efficiently absorb excess sebum and sweat without clumping. This action reduces surface tension, modifies formula rheology, and provides a dry-touch feel, while also potentially modulating active ingredient absorption.


Research

High confidence
Effective range 1–30%
Optimal

2%

Key findings

  1. 01 Sensory analysis on 60 volunteers showed a 2% concentration promoted a soft, velvety feel and significantly reduced skin oiliness in sunscreen formulations.
  2. 02 Effectively used in sunscreens to reduce the greasiness of UV filters and provide a dry-touch finish, potentially enhancing SPF.

Transparency

Commonly dusted

While used in powdered and spray formulations, its typical particle size (~13.5 microns) is generally considered non-respirable, mitigating inhalation concerns.


The Formula

Solubility
Water
Optimal pH 3.5 – 9
0 7 14

Stability

Stable across a wide cosmetic pH range (3.5-9.0) in both oil-in-water and water-in-oil emulsions. It is insoluble in cold water and requires dispersion for optimal integration.

Conflicts

  • Strong oxidizing agents
  • Extremely high alkaline conditions (may cause hydrolysis)

Safety

CIR Status
Safe as used
Max tested
30%
Sensitization risk Low

The CIR Expert Panel confirmed safety up to 30%, provided heavy metal limits (lead, arsenic) for food-grade starch are not exceeded. Clinical tests at 30% showed little irritation or sensitization.


Your Skin

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

Our Assessment

Valuable

This ingredient offers valuable textural and oil-control benefits, enhancing cosmetic elegance and user experience across diverse skincare formulations.


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