The industrial equivalent of naturally occurring plant resins is polymer resin. Like plant resins, polymer resin also begins as a viscous, sticky fluid that permanently hardens after exposure to air for a certain amount of time. Typically, thermosetting polymers and other organic compounds are soaped to create them. Companies that develop thermoplastics can utilize materials like methyl methacrylate, which, when liquid, acts like a casting-type resin. The polymerization of methyl methacrylate causes it to solidify into a hard substance. The final result is occasionally utilized as a kind of acrylic glass.