Unlike other adhesives — such as casein, a sealant made using milk-derived protein — standard Super Glue contains 100 percent ethyl 2-cyanoacrylate.
Other formulations, such as the combination of 91 percent ethyl 2-cyanoacrylate (ECA), 9 percent polymethacrylate, less than 0.5 percent hydroquinone, and a trace of organic sulfonic acid, are also common, according to Hot Melt.