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t-Butyl Methacrylate
AKA “tert-Butyl methacrylate, 585-07-9, Methacrylic acid, tert-butyl ester, 2-Propenoic acid, 2-methyl-, 1, 1-dimethylethyl ester, tert-Butyl 2-methylacrylate, CCRIS 7039, 1-Dimethylethyl 2-methyl-2-propenoate, EINECS 209-548-7, NSC 20957”
Ingredient
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Ingredient Facts
T-butyl methacrylate
AKA: Tert-Butyl methacrylate, 585-07-9, Methacrylic acid, Tert-butyl ester, 2-Propenoic acid, 2-methyl-, 1, 1-dimethylethyl ester, Tert-Butyl 2-methylacrylate, CCRIS 7039, 1-Dimethylethyl 2-methyl-2-propenoate, EINECS 209-548-7, NSC 20957
Ingredient · Film Forming · EWG: 4
Synthetic
Occlusive
Not Clean
2-Propenoic Acid, 2-Methyl-, 1,1- Dimethylethyl Ester
Formula
C8H14O2
Mol. Weight
142.20
CAS #
585-07-9
Form
Powder
State
Tert-butyl methacrylate appears as a colorless liquid with an ester like odor. Less dense than water and insoluble in water.
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 monomer developed in the mid-20th century, used in cosmetics as a film-forming agent and component of polymeric systems in nail lacquers and styling products.
Skin Types
●all-skin-types
Best For
General
Pregnancy & Breastfeeding Safe
Caution
EWG
4
CIR
Safe as used
Pregnancy
Caution
CIR Safety Findings
Not a Sensitizer
medical-approval
all-shades-safe
Regulatory Status
USA✔ permitted
EU⚠ restricted
JAPAN⚠ restricted
CANADA⚠ restricted
Final Report on the Safety Assessment of 2-Methyl-5-Hydroxyethylaminophenol
Cosmetic Ingredient Review (CIR) Expert Panel
International Journal of Toxicology
→
Final Report on the Safety Assessment of Methacrylic Acid
Cosmetic Ingredient Review (CIR) Expert Panel
International Journal of Toxicology
→
2-Methyl-5-Hydroxyethylaminophenol
European Commission
EU Cosmetic Ingredient Database (CosIng)
→
Behenyl Methacrylate/t-Butyl Methacrylate Copolymer
European Commission
EU Cosmetic Ingredient Database (CosIng)
→
C8-22 Alkyl Acrylates/Methacrylic Acid Crosspolymer
European Commission
EU Cosmetic Ingredient Database (CosIng)
→
Methacrylic Acid
European Commission
EU Cosmetic Ingredient Database (CosIng)
→
Methacrylic Acid/Styrene/VP Copolymer
European Commission
EU Cosmetic Ingredient Database (CosIng)
→
PEG/PPG-5/2 Methacrylate/Methacrylic Acid Crosspolymer
European Commission
EU Cosmetic Ingredient Database (CosIng)
→
t-Butyl Methacrylate
European Commission
EU Cosmetic Ingredient Database (CosIng)
→
2-Methyl-1-Phenyl-2-Propanol
Environmental Working Group (EWG)
EWG Skin Deep Cosmetics Database
→
2-Methyl-5-Hydroxyethylaminophenol
Environmental Working Group (EWG)
EWG Skin Deep Cosmetics Database
→
C8-22 Alkyl Acrylates/Methacrylic Acid Crosspolymer
Environmental Working Group (EWG)
EWG Skin Deep Cosmetics Database
→
Methacrylic Acid
Environmental Working Group (EWG)
EWG Skin Deep Cosmetics Database
→
2-Methyl-m-phenylenediamine
Health Canada
Health Canada Cosmetic Ingredient Hotlist
→
Methacrylic acid
Health Canada
Health Canada Cosmetic Ingredient Hotlist
→
Verified Jun 2026
Data: PubChem · CosIng · EWG · CIR