Acrylonitrile Butadiene Styrene (ABS) is a common thermoplastic polymer.ABS is a terpolymer made by polymerizing styrene and acrylonitrile in the presence of polybutadiene. The acrylonitrile also contributes chemical resistance, fatigue resistance, hardness, and rigidity, while increasing the heat deflection temperature. The styrene gives the plastic a shiny, impervious surface, as well as hardness, rigidity, and improved processing ease. The polybutadiene, a rubbery substance, provides toughness and ductility at low temperatures, at the cost of heat resistance and rigidity