Applicability

Section 219 Section 219.640  Applicability The provisions of this Subpart shall apply to polystyrene plants: a)         Which use continuous processes to manufacture polystyrene – polybutadiene co-polymer; and b)         Which fall within Standard Industrial Classification Group No. 282, Industry No. 2821, except that the manufacture of polystyrene resins need not be the primary manufacturing process at the plant.