Glass production is a complex process in which many factors must be taken into account. When the hot glass leaves the tin bath and reaches the dross box and the annealing lehr, the sensitive surface must be protected by coating effects based on SO₂. That’s why HORN^® has developed an effective system for a potent supply of SO₂.

Sulfur dioxide (SO₂) is injected proportionally to the ribbon bottom inside the lehr and dross box. The SO₂ reacts with the sodium (Na+) and calcium (Ca+) at the glass surface to sodium sulphate. As a result, the sodium sulphate acts like a “protection coating” between the rollers and the sensitive glass surface. But there’s another positive effect: the overall stability of the glass ribbon surface is also enhanced by the depletion of sodium and calcium.