AKA: Tert-Butyl methacrylate, 585-07-9, Methacrylic acid, Tert-butyl ester, 2-Propenoic acid, 1, 1-dimethylethyl ester, Tert-Butyl 2-methylacrylate, CCRIS 7039, 1-Dimethylethyl 2-methyl-2-propenoate
WHAT IS IT? Synthetic
Occlusive
Not Clean
Origin Produced from methacrylic acid and tert-butanol, both petroleum-derived chemicals in the acrylate family. Synthesized through esterification reaction between the carboxylic acid and alcohol under acid catalysis.
2-Propenoic Acid, 2-Methyl-, 1,1- Dimethylethyl Ester
State
Tert-butyl methacrylate appears as a colorless liquid with an ester like odor. Less dense than water and insoluble in water.
IS IT FOR ME? Pregnancy & Breastfeeding Safe
Caution
WHAT’S IT DO? 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
CAN I TRUST THIS? The paper trail
🛡️ Safety-assessed 2 reviews →
Counts, not a verdict. A listing isn't a study. The trail, you decide.
IS IT CLEAN? CIR Safety Findings
Not a Sensitizer
1 study / 1 not sensitizing (CIR 339)
Concentration Guide
CIR's newest survey reports no concentration of use.
CIR · 2020 survey
Regulatory Status
JAPAN ⚠ restricted
Verified Jun 2026
Data: PubChem · CosIng · EWG · CIR
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