40 CFR §426.20
Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
The provisions of this subpart are applicable to discharges of pollutants resulting from the process in which several mineral ingredients (sand, soda ash, limestone, dolomite, cullen and other ingredients) are mixed, melted in a furnace, and drawn vertically from a melting tank to form sheet glass.