The synthetic rubbers thus far developed bid fair to replace rubber permanently in hundreds of its varied uses. Though no one synthetic can, as yet, replace rubber in all of its applications, there are several synthetics available, each one of which excels rubber in one particular property. For example, some synthetics are oil- and gasoline-resistant, others resist the aging effects of heat, light, and oxygen, while still others surpass rubber in their resistance to flexing and abrasion.