Polymerization thumb|Chemical structure of ethyl cyanoacrylate, the precursor to many commercial adhesives The most common monomer is ethyl cyanoacrylate. Several related esters are known. To facilitate easy handling, a cyanoacrylate monomer is frequently formulated with an ingredient such as fumed silica to make it more viscous or gel-like. Formulations are available with additives to increase shear strength, creating a more impact resistant bond. Such additives may include rubber, as in Loctite's "Ultra Gel", or others which are not specified.
Polymerization thumb|Chemical structure of ethyl cyanoacrylate, the precursor to many commercial adhesives The most common monomer is ethyl cyanoacrylate. Several related esters are known. To facilitate easy handling, a cyanoacrylate monomer is frequently formulated with an ingredient such as fumed silica to make it more viscous or gel-like. Formulations are available with additives to incre?ase shear strength, creating a more impact resistant bond. Such additives may include rubber, as in Loctite's "Ultra Gel", or others which are not specified.