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BUTYL STEARATE.

Valuable CAS 123-95-5 / FRAGRANCE, SKIN CONDITIONING, SKIN CONDITIONING - EMOLLIENT

A lightweight ester that functions as an occlusive emollient, creating a protective moisture barrier without heaviness. This synthetic compound excels at reducing water loss while enhancing product texture and spreadability in cosmetic formulations.

emollient skin conditioning viscosity modifier texture enhancer

Science

Creates a thin hydrophobic film on the skin surface that prevents moisture escape from the stratum corneum, effectively reducing transepidermal water loss while providing lubrication and improved tactile properties.


Research

High confidence
Effective range 2–25%
Optimal

10%

Key findings

  1. 01 Clinical patch testing at 2% concentration demonstrated non-irritating properties with Primary Irritation Index of 0.03-0.11
  2. 02 Repeated Insult Patch Test at 10% showed no irritation, sensitization, or photosensitization reactions

Transparency

Not commonly dusted

Not commonly used for dusting due to legitimate functional benefits as emollient and texture modifier


The Formula

Solubility
Oil
Optimal pH 4 – 7
0 7 14

Stability

Highly stable ester with resistance to oxidation and heat degradation; low melting point at 27°C; susceptible to hydrolysis under extreme pH conditions

Conflicts

  • Strong oxidizing agents
  • Strong bases (causes saponification)
  • Strong acids (causes ester hydrolysis)

Safety

CIR Status
Safe as used
Max tested
25%
Pregnancy
Safe
Sensitization risk Low

CIR Expert Panel confirms safety at current usage levels; also FDA-approved as direct food additive


Your Skin

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

Our Assessment

Valuable

A well-tolerated emollient that effectively reduces water loss while improving product sensory properties, though moderate comedogenicity limits suitability for acne-prone skin.


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References