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Bis-Stearoxydimethylsilane
AKA “Dimethyldistearoxysilane, Silane, Dimethylbis(octadecyloxy)silane, EINECS 249-385-9, RefChem:182883, DTXCID3037911”
Synthetic
Ingredient Facts
Bis-Stearoxydimethylsilane
AKA: Dimethyldistearoxysilane, Dimethylbis(octadecyloxy)silane, EINECS 249-385-9, RefChem:182883, DTXCID3037911
Synthetic · Emollient · EWG: 4
Plant-Derived
Emollient
Occlusive
Skin Conditioner
Synthetic
Clean
A silicone-derived conditioner that smooths and softens skin, helping it feel silky and improving texture.
Formula
C38H80O2Si
Mol. Weight
597.10
CAS #
29043-70-7
See origin →
Functions
Skin Conditioning
A catch-all term for ingredients that improve how skin looks and feels — softer, smoother, more supple. The workhorse behind most moisturizers.
Emollient
Fills in the tiny cracks between skin cells to make everything feel smooth and soft. The "silky finish" ingredient.
Film Forming
Creates a physical seal on skin to lock moisture in and keep irritants out. The "slugging" ingredient — barrier protection.
Locks in moisture
Traditional Use
A synthetic silicone compound developed for the cosmetics industry. Created to function as a water-resistant emollient and skin protectant in modern skincare and sun care products.
Skin Types
●all-skin-types
Best For
General
Melanin-Rich Skin
Suitable
Pregnancy & Breastfeeding Safe
Yes
EWG
4
CIR
Insufficient
Pregnancy
Yes
CIR Safety Findings
Not a Sensitizer
medical-approval
all-shades-safe
Regulatory Status
USAunder review
EU⚠ restricted
JAPAN⚠ restricted
CANADA⚠ restricted
Verified Feb 2026
Data: PubChem · CosIng · EWG · CIR