murphyBis-Stearoxydimethylsilane
AKA: Dimethyldistearoxysilane, Dimethylbis(octadecyloxy)silane
Plant-Derived
Skin Conditioner
Not Clean
OriginDerived from stearic acid and dimethylsiloxane, both synthetic chemical building blocks from petroleum sources. Synthesized through esterification of stearic acid with dimethylsiloxane under catalytic conditions.
Bis-Stearoxydimethylsilane is the silicon compound
Formula
C38H80O2Si
Mol. Weight
597.10
CAS #
29043-70-7
Skin Types
●all-skin-types
Best For
General
Pregnancy & Breastfeeding Safe
Yes
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.
Locks in moisture
The paper trail
🔬Peer-reviewednone on file
⚖️Regulatory1 listing →
🛡️Safety-assessed1 review →
Counts, not a verdict. A listing isn't a study. The trail, you decide.
EWG
4
CIR
Safe as used
Pregnancy
Yes
CIR Safety Findings
Not a Skin Irritant
1 study / 1 not irritating (CIR 716)
Not a Sensitizer
1 study / 1 not sensitizing (CIR 716)
Not an Eye Irritant
1 study / 1 not irritating (CIR 716)
Concentration Guide
Leave-on0.38%
Rinse-offNot reported
0%50%100%
CIR reported use · 2015 survey
Regulatory Agencies
Verified Jun 2026
Data: PubChem · CosIng · EWG · CIR