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PENTAERYTHRITYL TETRAISONONANOATE.

Valuable CAS 93803-89-5 / SKIN CONDITIONING - EMOLLIENT

Pentaerythrityl Tetraisononanoate is a highly effective synthetic ester known for its emollient and occlusive properties. It creates a protective moisture barrier on the skin's surface, significantly reducing water loss and promoting intense hydration for a softer, smoother feel.

Summary

Emollient Occlusive agent Skin conditioning agent Texture enhancer Non-aqueous viscosity-increasing agent Wetting agent for pigments Wetting agent for UV filters

Science

Mechanism of Action

This ingredient functions by forming a non-greasy, protective film over the skin, effectively sealing in moisture and preventing transepidermal water loss. It works to fill microscopic gaps in the skin's surface, thereby restoring barrier integrity and providing immediate relief for dryness and flakiness. Beyond its role as a superior skin conditioner, it enhances the aesthetic qualities of formulations by improving spreadability and texture, and can act as a non-aqueous viscosity modifier and a wetting agent for various pigments and UV filters.

Research

Clinical Evidence

Low confidence
Effective range 0.06–50%
Optimal

N/A

Transparency

Dusting Analysis

Not commonly dusted

The Formula

Formulation

Solubility
Oil
Optimal pH N/A
0 7 14

Stability

Pentaerythrityl tetraesters generally exhibit strong oxidative stability and are broadly compatible with diverse cosmetic ingredients. However, thorough stability testing is essential, particularly when formulating with high concentrations of electrolytes or specific active compounds. To achieve a smooth, uniform final product and prevent crystallization, especially with related compounds having higher melting points, a controlled and gradual cooling process with continuous, gentle agitation is advised. It also demonstrates excellent compatibility with other oil-based components.

Synergies

  • Other oil agents

Conflicts

  • High concentrations of electrolytes
  • Certain active ingredients

Safety

Safety Profile

CIR Status
Safe as used
Max tested
50%
Sensitization risk Low

The Cosmetic Ingredient Review (CIR) Expert Panel has thoroughly evaluated Pentaerythrityl Tetraisononanoate, alongside other pentaerythrityl tetraester compounds, concluding its safety for use within current cosmetic concentrations and practices. For context, a related compound, Pentaerythrityl tetraethylhexanoate, has been effectively and safely utilized in concentrations ranging from 0.06% up to 50%.

Your Skin

Skin Compatibility

Yes Normal
Yes Dry
Yes Oily
Yes Sensitive
Irritancy Unknown
Comedogenicity Unknown

Our Assessment

Verdict

Valuable

Pentaerythrityl Tetraisononanoate is a valuable, safe, and oxidatively stable emollient that effectively moisturizes and conditions all skin types by forming a protective barrier, while also enhancing product texture and spreadability.

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