Methyl cyanoacrylate (MCA; also sometimes referred to as α-cyanoacrylate or alpha-cyanoacrylate)[3] is an organic compound that contains several functional groups: a methyl ester, a nitrile, and an alkene.

Its chief use is as the main component of cyanoacrylate glues.

It is soluble in acetone, methyl ethyl ketone, nitromethane, and dichloromethane.

[6] MCA polymerizes rapidly in presence of moisture.

Heating the polymer causes depolymerization of the cured MCA, producing gaseous products which are a strong irritant to the lungs and eyes.