§ 426.120 — Applicability; Description Of The Incandescent Lamp Envelope Manufacturing Subcategory

The provisions of this subpart are applicable to discharges resulting from the processes by which (a) raw materials are melted in a furnace and mechanically processed into incandescent lamp envelopes or (b) incandescent lamp envelopes are etched with hydrofluoric acid to produce frosted envelopes.