other examples can be seen in the "plastic" casings of television sets, cell-phones and similar objects. these plastic casings are usually a composite material. it is a thermoplastic matrix such as acrylonitrile-butadiene-styrene (abs) in which calcium carbonate chalk, talc, glass fibers or carbon fibers have been added for added strength, bulk, or electro-static dispersion. these additions may be referred to as reinforcing fibers, or dispersants, depending on their purpose.