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Hydroxyethylmethacrylate or HEMA is the monomer that is used to make the polymer PolyHydroxyethylmethacrylate. The polymer is hydrophilic; therefore, when the polymer is subjected to water it will swell. Depending on the physical and chemical structure of the polymer, it is capable of absorbing from 10 to 600% water relative to the dry weight. Because of this property, it was one of the first materials to be successfully used in the manufacture of flexible contact lenses[1]

CAS Number: 868-77-9

CAS Type 1 name: 2-propenoic acid, 2-methyl-, 2-hydroxyethyl ester

Molecular formula: C6H10O3

Systematic formula: H2C=C(CH3)COOCH2CH2OH

Molecular Weight: 130.14


  1. Blasco, Joe; Kehoe, Vincent J-R; The professional make-up artist : motion pictures, television, print, theatre; ISBN 0977158004; LCC# PN2068.B53 2005