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Moumoujus

BUTYL ISOSTEARATE.

Questionable CAS 94109-07-6 / SKIN CONDITIONING, SKIN CONDITIONING - EMOLLIENT

A synthetic ester that functions as a lightweight emollient, creating a non-greasy protective barrier on skin to prevent moisture loss. Despite its excellent skin-conditioning properties, this ingredient carries a high comedogenic rating, making it potentially problematic for acne-prone skin types.

Summary

emollient skin-conditioning agent

Science

Mechanism of Action

Forms a hydrophobic film on the stratum corneum that reduces transepidermal water loss while enhancing skin lubrication and improving the spreadability of cosmetic formulations without leaving a heavy, greasy feel.

Research

Clinical Evidence

Low confidence
Effective range N/A
Optimal

N/A

Transparency

Dusting Analysis

Not commonly dusted

Not commonly found in current cosmetic formulations according to CIR assessment data, suggesting limited commercial use despite safety approval.

The Formula

Formulation

Solubility
Oil
Optimal pH 3.5 – 8
0 7 14

Stability

Demonstrates excellent stability under normal conditions but susceptible to hydrolysis at extreme pH levels, breaking down into butyl alcohol and isostearic acid components.

Conflicts

  • Strong oxidizing agents
  • Strong acids
  • Strong bases

Safety

Safety Profile

CIR Status
Safe as used
Sensitization risk Low

Safety assessment based on read-across data from alkyl esters group showing minimal irritation in human repeat insult patch testing, with approval contingent on non-irritating formulation practices.

Your Skin

Skin Compatibility

Yes Normal
Yes Dry
No Oily
Yes Sensitive
Irritancy Low
Comedogenicity High

Our Assessment

Verdict

Questionable

While effective as an emollient with good safety data, the high comedogenic potential limits its suitability for most skin types, particularly in a precision skincare approach.

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