Styrene/Stearyl Methacrylate Crosspolymer
AKA “Styrene-Stearyl Methacrylate Crosspolymer
Skin Conditioning
Ingredient Facts
Styrene/stearyl methacrylate crosspolymer
AKA: Styrene-Stearyl Methacrylate Crosspolymer
Skin Conditioning · Absorbent · EWG: 1
Plant-Derived
Skin Conditioner
Clean
2-Propenoic Acid, 2-Methyl-, Octadecyl Ester, Polymer wtih Divinylbenzene and Ethenylbenzene
CAS #
91838-84-5
Form
Liquid
See origin →
Functions
Absorbent
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
Traditional Use
A synthetic crosspolymer combining styrene and stearyl methacrylate, developed in the late 20th century as a thickener and film-forming agent in cosmetics and personal care products.
Skin Types
all-skin-types
Best For
General
Pregnancy & Breastfeeding Safe
Yes
EWG
1
CIR
Safe as used
Pregnancy
Yes
CIR Safety Findings
medical-approval
all-shades-safe
Regulatory Status
USApermitted
EUrestricted
JAPANrestricted
CANADArestricted
Verified Jun 2026
Data: CosIng · EWG · CIR