Cyclotetrasiloxane
AKA “Cyclotetrasiloxane, Oktamethylcyklotetrasiloxan, Cyclic dimethylsiloxane tetramer, NUC silicone VS 7207, Union carbide 7207
Synthetic
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Ingredient Facts
Cyclotetrasiloxane
AKA: Oktamethylcyklotetrasiloxan, Cyclic dimethylsiloxane tetramer, NUC silicone VS 7207, Union carbide 7207
Synthetic · Hair Conditioning | Skin Conditioning - Emollient | Solvent · EWG: 4
Plant-Derived
Emollient
Solvent
Skin Conditioner
Hair Care
Silicone
Synthetic
Clean
A lightweight conditioning agent that smooths hair and skin while helping other ingredients blend seamlessly into the formula.
Formula
H8O4Si4
Mol. Weight
184.40
CAS #
556-67-2, 293-51-6
Form
Liquid
Plant-Derived
Synthetic. Derived from silicon and oxygen, belonging to the siloxane chemical family of organosilicon compounds. Synthesized through ring-opening polymerization of smaller siloxane monomers, then cyclized to form the four-membered ring structure.
Function
Hair Conditioning | Skin Conditioning - Emollient | Solvent
Benefits
Locks In Moisture
Traditional Use
A cyclic silicone oligomer synthesized in the mid-20th century. Developed for cosmetics as an ultra-lightweight volatile emollient and spreading agent offering a silky feel superior to traditional plant oils.
Skin Types
all-skin-types
Best For
Target
General
Melanin-Rich Skin
Suitable
Pregnancy Safe
Yes
EWG Score4
CIR Safety Findings
medical-approval, all-shades-safe
Regulatory Status
USApermitted
EUpermitted
JAPANpermitted
CANADApermitted
Verified Feb 2026
Data: PubChem · CosIng · EWG · CIR