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CHIMYL STEARATE.

Valuable CAS 109210-83-5 / SKIN CONDITIONING, SKIN CONDITIONING - EMOLLIENT, SURFACTANT - EMULSIFYING

Chimyl Stearate is a specialized alkyl ester that serves as both a high-performance emollient and a secondary emulsifying agent. It is engineered to refine product texture while reinforcing the skin's natural moisture barrier against environmental stressors.

emollient skin-conditioning agent emulsifying agent occlusive

Science

This ingredient operates via an occlusive mechanism, creating a breathable lipid film on the stratum corneum to significantly reduce transepidermal water loss (TEWL). Simultaneously, its amphiphilic structure helps stabilize the interface between oil and water phases, ensuring a homogenous and elegant formula delivery.


Research

Medium confidence
Effective range 1.5–46%
Optimal

1.5%

Key findings

  1. 01 Human Repeated Insult Patch Tests (RIPT) confirm that concentrations at 1.5% are non-sensitizing and non-irritating to human skin.
  2. 02 Safety assessments indicate that while undiluted material may cause ocular irritation, diluted formulations (1.5%) demonstrate high ocular compatibility.

Transparency

Not commonly dusted
Min. effective
1%
Red flag below
0.5%

Because it functions primarily as a texture enhancer and emollient, it is rarely 'dusted' for marketing purposes; however, inclusion below 0.5% may not provide the intended barrier-repair benefits.


The Formula

Solubility
Oil
Optimal pH 4 – 8
0 7 14

Stability

Being an ester, it is susceptible to hydrolysis if exposed to extreme pH environments (strong acids or alkalis), but remains highly stable within standard cosmetic pH ranges.

Synergies

  • Humectants (to lock in moisture)
  • Non-polar oils
  • Mineral UV filters

Conflicts

  • Strong oxidizing agents
  • Highly acidic exfoliating serums
  • Strong alkaline solutions

Safety

CIR Status
Safe as used
Max tested
46%
Pregnancy
Safe
Sensitization risk Low

The CIR Expert Panel supports its safety in leave-on products, emphasizing that formulations must be designed to avoid the irritation potential seen only in 100% pure concentrations.


Your Skin

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

Our Assessment

Valuable

An excellent texture-enhancing emollient for dry and sensitive skin types, though its moderate comedogenicity suggests caution for acne-prone individuals.


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