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Polyisobutyl Methacrylate
AKA “PIBM, poly(isobutyl methacrylate)”
Ingredient
Ingredient Facts
Polyisobutyl methacrylate
AKA: PIBM, Poly(isobutyl methacrylate)
Ingredient · Film Forming · EWG: 4
Synthetic
Occlusive
Not Clean
Polyisobutyl Methacrylate is the homopolymer of isobutyl methacrylate
CAS #
9011-15-8
Form
Powder
See origin →
Functions
Film Forming
Creates a physical seal on skin to lock moisture in and keep irritants out. The "slugging" ingredient — barrier protection.
Creates Protective Barrier
Traditional Use
A synthetic acrylic polymer developed in the 20th century cosmetics industry. Created to provide film-forming and conditioning properties as an alternative to natural gums and resins.
Skin Types
●all-skin-types
Best For
General
Pregnancy & Breastfeeding Safe
Yes
EWG
4
CIR
Safe as used
Pregnancy
Yes
CIR Safety Findings
Not a Sensitizer
medical-approval
all-shades-safe
Regulatory Status
USA✔ permitted
EU⚠ restricted
JAPAN⚠ restricted
CANADA⚠ restricted
Verified Jun 2026
Data: CosIng · EWG · CIR