40 CFR § 426.100
Applicability; description of the glass tubing (Danner) manufacturing subcategory
June 9, 2020
The provisions of this subpart are applicable to discharges resulting from the process by which raw materials are melted in a furnace and glass tubing mechanically drawn from the furnace horizontally by means of the Danner process, which requires the intermittent quenching of cullet.