Methacrylic Acid

Methacrylic Acid

AKA “79-41-4, 2-methylprop-2-enoic acid, 2-Methylacrylic acid, Methylacrylic acid, 2-Propenoic acid, 2-methyl-, 2-Methylpropenoic acid, 2-Methyl-2-propenoic acid, alpha-Methylacrylic acid, 2-Methylenepropionic acid”

Acid

Ingredient Facts

Methacrylic acid

AKA: 79-41-4, 2-methylprop-2-enoic acid, 2-Methylacrylic acid, Methylacrylic acid, 2-Propenoic acid, 2-methyl-, 2-Methylpropenoic acid, 2-Methyl-2-propenoic acid, Alpha-Methylacrylic acid, 2-Methylenepropionic acid

Acid · Film Forming · EWG: 6

Synthetic

Occlusive

Acid

Not Clean

Methacrylic acid, stabilized appears as a clear colorless liquid with a pungent odor. Corrosive to metals and tissue. Combustible. Flash point 170 °F. Melting point 61 °F. May polymerize if contaminated or heated. If polymerization takes place inside a closed container, the container may violently rupture. Less dense than water and is soluble in water. Vapors heavier than air. Used to make plastics.

Solubility greater than or equal to 100 mg/mL at 63 °F (NTP, 1992)

Formula

C4H6O2

Mol. Weight

86.09

CAS #

79-41-4

Form

Liquid

State

Methacrylic acid appears as a clear colorless liquid (or low-melting solid) with a pungent odor. Corrosive to metals and tissue. Flash point 170 °F. Melting point 61 °F. May polymerize exothermically

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

Wound Healing

Fights Bacteria

Traditional Use

Developed in the early 20th century as part of modern polymer chemistry; used in cosmetics since mid-century as a raw material for creating film-forming and thickening agents in skincare and haircare products.